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North Idaho Weather Records & Averages

Counties in Northern Idaho*

* Names in parentheses are the locations of weather data collection stations. Click on one of the following links to obtain the historical records and averages for that site. Remember that mountains, valleys, elevation, and other topographical features strongly affect climate and weather. The weather at your site can differ from that at the official data collection site.

 

The weather data below were provided by the University of Idaho, National Weather Service, and Western Regional Climate Center. For more detailed information or for data on cities not listed below, visit the Western regional Climate Center.

 

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Benewah (St. Maries)

Bonner (Sandpoint)

Boundary (Bonners Ferry)

Clearwater (Headquarters)

Idaho (Grangeville)

Kootenai (Coeur d'Alene)

Latah (Moscow)

Lewis (Nezperce)

Nez Perce (Lewiston)

Shoshone (Kellogg)
 

Benewah County

Averages based on data collected at St. Maries, Idaho: elevation 2,220 feet.

Month Temperature
(oF)		 Precipitation
(inches)
average daily maximum
 average daily minimum
 2 years in 10 will have: average
 2 years in 10 will have: average number of days with 0.1 inch or more average snowfall
maximum temperature greater than: minimum temperature lower than less than
 greater than
Jan 35.2 21.9 53 -13 4.85 2.79 6.53 12 21.5
Feb 42.6 25.5 60 0 2.96 1.65 4.02 8 9.6
Mar 48.4 27.2 70 7 2.78 1.81 3.65 9 6.6
Apr 58.4 32.6 80 21 2.18 1.24 2.95 6 0.5
May 69.1 40.0 90 27 2.02 1.15 2.71 6 0.0
Jun 76.3 46.1 93 35 2.19 1.31 2.96 5 0.0
Jul 86.4 48.6 101 37 0.60 0.06 1.00 2 0.0
Aug 85.3 47.1 102 35 1.14 0.17 1.87 3 0.0
Sep 75.7 41.0 95 27 1.43 0.67 2.05 4 0.0
Oct 61.4 34.9 83 21 2.37 1.02 3.47 7 0.5
Nov 44.8 29.1 63 7 3.74 1.91 5.23 10 5.7
Dec 36.8 24.9 53 -5 4.23 2.79 5.53 12 15.1
 
Year 60.0 34.9 103 -18 30.49 26.63 34.20 84 59.5

 

Record Extremes
   Maximum temperature: 109 oF: August 4, 1961
   Minimum temperature: -29 oF: December 30, 1968

   Max one-day precipitation (rain & melted snow): 2.33 inches: October 27, 1994

   Maximum snowfall (January-December): 174.3 inches: 1996

Frost dates

Probability

Minimum Temperature
24 oF or lower 28 oF or lower 32 oF or lower

Last freezing temperature in spring
1 year in 10 later than April 24 May 14 June 3
2 years in 10 later than April 17 May 8 May 28
5 years in 10 later than April 4 April 27 May 17

First freezing temperature in fall
1 year in 10 earlier than October 4 September 14 September 3
2 years in 10 earlier than October 13 September 21 September 9
5 years in 10 earlier than October 28 October 4 September 18

Growing Seasons

Probability

Daily Minimum Temperature During the Growing Season 

higher than 24 oF higher than 28 oF higher than 32oF
9 years in 10 171 days 131 days 102 days
8 years in 10 183 141 109
5 years in 10 206 159 123
2 years in 10 229 178 138
1 year in 10 242 188 145

Growing Degree Days

Growing Degree Days for Selected Base Temperatures (oF)

1948-2005 Averages
Base Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
40 4 14 63 201 436 624 840 820 547 234 35 4 3822
45 0 2 17 97 289 475 685 665 399 118 7 0 2755
50 0 0 3 38 163 327 530 510 261 46 1 0 1879
55 0 0 0 11 74 195 376 357 144 12 0 0 1169
60 0 0 0 3 26 93 232 215 61 1 0 0 630

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Bonner County

Averages based on data collected at Sandpoint, Idaho: elevation 2,120 feet.

Month Temperature
(oF)		 Precipitation
(inches)
average daily maximum
 average daily minimum
 2 years in 10 will have: average
 2 years in 10 will have: average number of days with 0.1 inch or more average snowfall
maximum temperature greater than: minimum temperature lower than less than
 greater than
Jan 32.0 20.9 48 -13 4.8 2.74 6.61 11 30.4
Feb 38.5 24.4 52 -6 3.17 1.76 4.40 8 14.8
Mar 44.7 26.9 61 4 2.55 1.39 3.57 8 8.4
Apr 55.8 33.4 75 20 2.08 1.06 2.96 6 0.9
May 65.8 39.9 83 26 2.27 1.26 3.15 7 0.0
Jun 72.9 46.2 90 33 2.19 1.20 3.04 7 0.0
Jul 81.2 48.5 94 36 0.95 0.23 1.53 3 0.0
Aug 79.9 47.3 96 35 1.56 0.33 2.53 4 0.0
Sep 69.7 41.4 87 27 1.68 0.54 2.61 5 0.0
Oct 56.0 34.2 74 19 2.68 0.89 4.16 7 1.1
Nov 41.0 28.2 57 9 4.36 2.07 6.32 10 8.8
Dec 33.8 23.7 49 -7 4.84 3.12 6.39 11 23.7
 
Year 55.9 34.6 45.3 - - - 33.13 28.96 37.12 87 88.1

 

Record Extremes
    Maximum temperature: 104 oF: July 20, 1923
    Minimum temperature:  -37 o F: December 30, 1968

    Max one-day precipitation (rain & melted snow): 2.95 inches: May 27, 1998

    Maximum snowfall (January-December): 172.1 inches: 1964
   
Frost dates

Probability Minimum Temperature
24 oF or lower 28 oF or lower 32 oF or lower

Last freezing temperature in spring
1 year in 10 later than April 27 May 21 June 2
2 years in 10 later than April 21 May 15 May 28
5 years in 10 later than April 9 May 2 May 18

First freezing temperature in fall
1 year in 10 earlier than September 26 September 18 September 1
2 years in 10 earlier than October 6 September 24 September 6
5 years in 10 earlier than October 24 October 7 September 16

Growing Seasons

Probability

Daily Minimum Temperature During the Growing Season
higher than 24 oF higher than 28 oF higher than 32 oF
9 years in 10 159 days 132 days 99 days
8 years in 10 172 140 106
5 years in 10 197 157 120
2 years in 10 221 173 134
1 year in 10 234 182 141

Growing Degree Days

Growing Degree Days for Selected Base Temperatures (oF)

1910-2005 Averages
Base Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
40 1 4 34 181 411 586 782 744 473 190 22 4 3431
45 0 0 6 82 263 437 627 589 325 84 4 0 2416
50 0 0 0 27 140 290 472 434 192 25 0 0 1582
55 0 0 0 7 58 161 319 283 89 4 0 0 920
60 0 0 0 1 17 68 178 148 28 0 0 0 440

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Boundary County

Averages based on data collected at Bonners Ferry, Idaho: elevation 1,860 feet.

Month Temperature
(oF)		 Precipitation
(inches)
average daily maximum
 average daily minimum
 2 years in 10 will have at least 4 days with: average
 2 years in 10 will have: number of days with snow cover average snow depth on days with snow cover
maximum temperature greater than: minimum temperature lower than less than
 greater than
Jan 31.4 18.6 44 -5 3.4 1.10 6.11 25 12
Feb 39.2 23.0 48 7 2.13 0.73 3.35 19 13
Mar 46.9 26.4 60 12 1.72 0.79 2.72 9 9
Apr 59.1 33.7 73 25 1.326 0.52 1.94 0 0
May 68.8 40.5 83 31 1.67 0.81 3.07 0 0
Jun 74.7 46.9 88 38 1.85 0.87 3.18 0 0
Jul 84.1 49.8 95 41 0.80 0.10 1.97 0 0
Aug 82.3 48.3 94 40 1.00 0.28 2.00 0 0
Sep 72.4 41.8 87 32 1.50 0.45 3.10 0 0
Oct 56.8 34.6 70 24 2.39 0.44 4.53 1 2
Nov 41.3 27.5 48 12 3.43 0.95 5.81 6 6
Dec 34.3 23.1 44 5 3.39 1.70 4.84 18 7
 
Year 57.6 34.5 97 -9 24.54 20.20 29.47 78 10

 

Record Extremes
    Maximum temperature: 104 oF: July 16, 1941
    Minimum temperature: -33 oF: December 30, 1968

    Max one-day precipitation (rain & melted snow): 2.80 inches: Jan 27, 1999

    Maximum snowfall (January-December): 148.8 inches: 1996

Frost dates

Probability Minimum Temperature
24 oF or lower 28 oF or lower 32 oF or lower

Last freezing temperature in spring
1 year in 10 later than April 24 May 16 May 30
2 years in 10 later than April 17 May 11 May 25
5 years in 10 later than April 5 April 30 May 14

First freezing temperature in fall
1 year in 10 earlier than October 3 September 18 September 6
2 years in 10 earlier than October 10 September 25 September 11
5 years in 10 earlier than October 24 October 9 September 20

Growing Degree Days

Growing degree days for selected temperatures (oF)

1907-2005 averages
Base Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
40 3 5 47 214 457 629 831 798 512 194 25 3 3719
45 0 0 10 100 305 479 676 643 365 88 5 0 2671
50 0 0 1 35 171 331 521 489 227 26 0 0 1801
55 0 0 0 8 75 193 367 336 114 4 0 0 1099
60 0 0 0 1 23 88 22 195 41 0 0 0 570

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Clearwater

Averages based on data collected at Headquarters, Idaho: elevation 3,140 feet.

For lower elevation sites, such as Orofino, Nez Perce County (Lewiston) data provide reasonably close approximations.

Month

Temperature
(o F)

Precipitation
(inches)
rain and melted snow average snowfall

record max

snowfall
average daily maximum average daily minimum monthly average average record max record min
Jan 35.2 18.9 27.1 5.38 10.08 0.93 29.5 72.5
Feb 40.1 19.4 29.8 3.92 8.47 0.77 16.0 40.0
Mar 45.3 23.4 34.3 3.97 8.78 1.35 12.7 36.5
Apr 53.3 28.7 41.0 3.26 7.30 0.22 3.6 18.0
May 62.7 34.9 48.8 3.30 9.13 0.58 0.5 4.5
Jun 70.9 41.9 56.5 2.49 6.35 0.28 0.0 0.0
Jul 80.6 45.0 62.7 1.13 4.20 0.00 0.0 0.0
Aug 80.8 43.3 62.1 1.17 4.18 0.00 0.0 0.0
Sep 70.2 36.5 53.5 1.74 7.76 0.09 0.0 0.0
Oct 57.3 29.8 43.4 3.08 6.33 0.00 0.7 6.5
Nov 42.8 25.1 33.9 5.06 10.55 1.08 14.0 59.5
Dec 34.9 19.7 27.2 5.33 12.57 0.57 28.3 88.0
 
Year 56.2 30.6 43.4 39.83 -- -- 105.1 --

 

Record Extremes
    Maximum temperature: 108 oF: August 5, 1961
    Minimum temperature: -28 oF: December 31, 1968

    Max one-day precipitation (rain & melted snow): 2.30 inches: April 24, 1996

    Maximum snowfall (January-December): 220.0 inches: 1971

Average Frost Dates and Growing Seasons

Threshold Temperature
24 oF 28 oF 32 oF

Last freezing temperature in spring
April 22 May 20 June 14

First freezing temperature in fall
October 7 September 21 September 2

Length of growing season (days)
167 123 79

Growing Degree Days

Growing degree days for selected base temperatures (oF)

1959-2005 averages
Base Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
40 0 2 17 92 283 495 705 685 406 143 18 0 2846
45 0 0 2 37 162 348 550 530 267 59 2 0 1958
50 0 0 0 13 77 215 396 378 153 18 0 0 1250
55 0 0 0 3 29 110 252 236 72 3 0 0 705
60 0 0 0 1 8 44 130 119 23 0 0 0 326

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Idaho County

Averages based on data collected at Grangeville, Idaho: elevation 3,360 feet.

Month

Temperature

oF

Precipitation

(inches)
average daily maximum average daily minimum monthly average rain and melted snow average snowfall record max snowfall
average record max record min
Jan 36.8 21.3 29.1 1.55 4.23 0.25 10.6 34.0
Feb 42.4 24.5 33.4 1.28 3.31 0.06 7.1 26.5
Mar 48.3 27.7 38.0 2.17 4.33 0.56 8.4 32.0
Apr 56.1 32.9 44.5 2.78 5.58 0.45 3.4 16.0
May 64.0 39.4 51.7 3.48 8.24 0.88 0.4 5.0
Jun 71.4 45.7 58.5 2.86 7.69 0.65 0.0 0.0
Jul 81.7 50.6 66.2 1.26 5.12 0.00 0.0 0.0
Aug 81.8 49.7 65.8 1.15 4.15 0.00 0.0 0.0
Sep 71.9 42.3 57.1 1.67 5.24 0.02 0.0 0.0
Oct 59.1 34.7 46.9 1.90 4.82 0.00 1.2 14.0
Nov 44.7 27.9 36.3 1.81 3.88 0.14 5.9 41.0
Dec 37.9 22.6 30.3 1.57 4.46 0.28 11.2 35.0
 
Year 58.0 35.0 46.5 23.48 -- -- 48.4 --

 

Record Extremes
    Maximum temperature: 106 oF: August 4, 1961
    Minimum temperature: -25 oF: December 30, 1968

    Max one-day precipitation (rain & melted snow): 3.01 inches: Sep 14, 1955

    Maximum snowfall (January-December): 86.3 inches: 1975

Average Frost Dates and Growing Seasons

Threshold Temperature
24 oF 28 oF 32 oF

Last freezing temperature in spring
April 8 April 28 May 17

First freezing temperature in fall
October 25 October 6 September 21

Length of growing season (days)
199 161 127

Growing Degree Days

Growing degree days for selected base temperatures (oF)

1948-2005 averages
Base Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
40 11 19 59 163 366 557 811 799 514 235 45 12 3591
45 2 3 18 77 229 408 656 644 369 124 13 2 2544
50 0 0 3 29 123 266 501 489 237 52 3 0 1703
55 0 0 0 8 54 147 349 338 129 15 0 0 1042
60 0 0 0 1 18 66 210 201 55 2 0 0 553

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Kootenai County

Averages based on data collected at Coeur d'Alene, Idaho: elevation 2,160 feet.

Month Temperature
(oF)		 Precipitation
(inches)
average daily maximum
 average daily minimum
 2 years in 10 will have: average
 2 years in 10 will have: average number of days with 0.1 inch or more average snowfall
maximum temperature greater than: minimum temperature lower than less than
 greater than
Jan 34.5 21.8 54 -14 3.35 2.53 5.88 12 16.0
Feb 40.5 24.3 59 1 2.45 1.64 3.95 9 8.9
Mar 48.4 28.6 69 4 2.28 1.69 3.26 8 3.6
Apr 58.4 34.4 82 23 1.73 1.37 3.18 7 0.5
May 68.0 41.7 92 27 2.01 1.30 3.18 6 0.0
Jun 75.1 48.2 95 35 1.80 1.57 3.17 6 0.0
Jul 85.0 53.0 102 37 0.72 0.15 1.32 2 0.0
Aug 84.8 52.0 103 36 0.92 0.31 1.95 3 0.0
Sep 73.8 44.7 95 28 1.27 0.80 2.46 5 0.0
Oct 60.3 37.2 84 22 1.95 1.19 3.74 8 0.2
Nov 44.2 30.0 62 6 3.09 1.73 4.48 9 4.3
Dec 36.6 25.4 54 -5 3.63 2.48 4.48 11 12.7
 
Year 59.1 36.8 103 -19 25.21 26.10 34.06 86 46.2

 

Record Extremes
    Maximum temperature: 109 oF: August 4, 1961
    Minimum temperature: -30 oF: January 30, 1950

    Max one-day precipitation (rain & melted snow): 3.50 inches: January 4, 1998

    Maximum snowfall (January-December): 120.0 inches: 1970

 

Frost dates

Probability Minimum Temperature
24 oF or lower 28 oF or lower 32 oF or lower

Last freezing temperature in spring
1 year in 10 later than April 25 May 7 June 3
2 years in 10 later than April 17 May 1 May 28
5 years in 10 later than April 3 April 19 May 16

First freezing temperature in fall
1 year in 10 earlier than October 9 September 14 September 1
2 years in 10 earlier than October 17 September 24 September 10
5 years in 10 earlier than November 1 October 12 September 26

 

Growing Seasons

Probability Daily Minimum Temperature During the Growing Season
higher than 24 oF higher than 28 oF higher than 32 oF
9 years in 10 171 days 137 days 98 days
8 years in 10 185 150 110
5 years in 10 211 176 133
2 years in 10 237 201 155
1 year in 10 250 214 167

Growing Degree Days

Growing degree days for selected base temperatures (oF)

1895-2005 averages
Base Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
40 5 9 55 204 460 650 897 881 578 283 41 10 4073
45 1 1 13 98 310 500 742 726 430 154 9 1 2984
50 0 0 1 37 180 352 587 571 288 64 1 0 2081
55 0 0 0 11 85 214 433 417 165 19 0 0 1343
60 0 0 0 2 31 106 283 269 75 3 0 0 770

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Latah County

Averages based on data collected at Moscow, Idaho: elevation 2,660 feet.

Month Temperature
(degrees F)		 Precipitation
(inches)
average daily maximum
 average daily minimum
 2 years in 10 will have: average
 2 years in 10 will have: average number of days with 0.1 inch or more average snowfall
maximum temperature greater than: minimum temperature lower than less than
 greater than
Jan 35.3 23.0 52 -14 3.23 1.50 4.62 9 15.9
Feb 41.4 27.5 58 2 2.01 1.02 2.81 6 6.9
Mar 46.9 29.7 66 10 1.96 1.29 2.56 7 4.8
Apr 56.6 34.3 77 22 1.79 0.79 2.60 6 0.9
May 66.6 40.8 87 26 1.77 1.09 2.37 5 0.0
Jun 73.7 46.0 91 33 1.72 0.96 2.33 5 0.0
Jul 84.3 48.8 99 35 0.58 0.06 0.97 2 0.0
Aug 83.3 48.8 100 35 0.85 0.17 1.38 2 0.0
Sep 73.9 43.7 95 27 1.19 0.41 1.80 4 0.0
Oct 60.3 37.3 82 21 1.90 0.75 2.83 5 0.3
Nov 44.8 30.6 61 8 3.02 1.48 4.26 8 4.4
Dec 37.0 25.7 52 -7 3.35 2.05 4.52 10 14.9
 
Year 58.7 36.4 101 -22 23.37 19.54 27.01 69 48.1

 

Record Extremes
    Maximum temperature: 109 oF: August 4, 1961
    Minimum temperature: -42 oF: December 30, 1968

    Max one-day precipitation (rain & melted snow): 2.51 inches: December 2, 1998

    Maximum snowfall (January-December): 129.8: 1996

Frost dates

Probability Minimum Temperature
24 oF or lower 28 oF or lower 32 oF or lower

Last freezing temperature in spring
1 year in 10 later than April 30 May 23 June 5
2 years in 10 later than April 19 May 13 May 30
5 years in 10 later than March 28 April 25 May 18

First freezing temperature in fall
1 year in 10 earlier than October 3 September 13 August 24
2 years in 10 earlier than October 11 September 20 September 3
5 years in 10 earlier than October 27 October 5 September 21

Growing Seasons

Probability

Daily Minimum Temperature During the Growing Season 

higher than 24 oF higher than 28 oF higher than 32 oF
9 years in 10 170 days 125 days 91 days
8 years in 10 184 137 102
5 years in 10 212 162 125
2 years in 10 239 186 148
1 year in 10 253 199 159

Growing Degree Days

Growing degree days for selected base temperatures (oF)

1893-2005 averages
Base Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
40 6 16 69 205 413 585 824 810 555 282 53 9 3827
45 0 2 22 104 269 435 669 655 407 161 14 1 2740
50 0 0 5 44 150 291 514 500 269 74 2 0 1849
55 0 0 0 15 70 165 362 348 154 27 0 0 1142
60 0 0 0 4 26 76 220 210 71 7 0 0 614

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Lewis County

Averages based on data collected at Nezperce, Idaho: elevation 3,150 feet.  

Month

Temperature

oF

Precipitation

(inches)

average daily maximum

average daily minimum

monthly average

rain and melted snow

average snowfall

record max snowfall

average

record max

record min

Jan

34.9 21.5 28.2 1.74 4.44 0.21 11.9 35.0

Feb

40.7 24.7 32.7 1.34 2.91 0.27 6.5 23.5

Mar

46.9 28.1 37.5 1.81 3.82 0.59 5.8 19.0

Apr

54.9 33.2 44.0 2.22 4.23 0.72 2.8 11.0

May

63.2 39.2 51.2 2.93 5.86 1.02 0.3 3.0

Jun

70.5 44.8 57.7 2.26 5.48 0.71 0.0 0.0

Jul

80.5 48.9 64.7 1.06 3.81 0.02 0.0 0.0

Aug

80.8 48.5 64.7 1.17 4.24 0.00 0.0 0.0

Sep

71.3 42.1 56.7 1.31 4.67 0.04 0.0 0.0

Oct

57.9 34.9 46.4 1.70 3.90 0.00 1.0 9.0

Nov

42.8 27.7 35.3 1.87 3.49 0.56 5.7 23.0

Dec

35.5 22.7 29.1 1.61 4.77 0.40 9.3 30.0

 

Year

56.7 34.7 45.7 21.01 -- -- 43.4 --

Record Extremes
    Maximum temperature: 104 oF: August 4, 1961
    Minimum temperature: -33 oF: December 30, 1968

    Max one-day precipitation (rain & melted snow): 2.32 inches: July 13, 1956

    Maximum snowfall (January-December): 99.5 inches: 1955

Average Frost Dates and Growing Seasons

Threshold Temperature
24 o F 28 o F 32 o F
Last freezing temperature in spring
April 11 May 3 May 19
First freezing temperature in fall
October 24 October 2 September 21
Length of growing season (days)
195 152 124

Growing Degree Days

Growing degree days for selected base temperatures (oF)

1901-2005 averages
Base Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
40 5 15 50 150 350 530 764 765 501 221 35 6 3390
45 1 2 13 68 213 381 609 610 355 114 8 1 2376
50 0 0 2 25 109 241 455 456 224 47 1 0 1559
55 0 0 0 6 46 127 304 306 119 14 0 0 922
60 0 0 0 1 15 52 170 173 48 2 0 0 461

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Nez Perce County

Averages based on data collected at Lewiston, Idaho: elevation 1,440 feet.

Month

Temperature

oF

Precipitation

(inches)

average daily maximum

average daily minimum

monthly average

rain and melted snow

average snowfall

record max snowfall

average

record max

record min

Jan

 39.4

26.8

  33.1

1.23 3.55 0.14 5.8 26.1

Feb

 46.2

30.6

 38.4

0.88 2.22 0.17 2.6 14.9

Mar

  53.8

34.4

 44.1

1.08 2.70 0.25 1.4 9.7

Apr

 62.1

39.6

50.9  

1.22 3.29 0.05 0.1 1.1

May

70.7 46.5 58.6 1.53 3.78 0.27 0.0 0.0

Jun

78.8 53.1 65.9 1.37 4.70 0.23 0.0 0.0

Jul

89.1 58.9 74.0 0.61 2.60 0.00 0.0 0.0

Aug

88.0 58.2 73.1 0.72 2.96 0.00 0.0 0.0

Sep

77.8 50.3 64.1 0.75 2.48 0.00 0.0 0.0

Oct

62.9 40.8 51.8 1.00 2.79 0.00 0.1 2.5

Nov

48.0 33.5 40.7 1.18 2.79 0.23 1.7 14.4

Dec

40.7 28.7 34.7 1.14 3.28 0.14 4.1 18.7

 

Year

63.1 41.8 52.5 12.70 -- -- 15.8 --

 

Record Extremes
    Maximum temperature: 115 oF: August 4, 1961
    Minimum temperature:-22 oF: December 30, 1968

    Max one-day precipitation (rain & melted snow): 1.80 inches: July 10, 1998

    Maximum snowfall (January-December): 40.6 inches: 1955

 

Average Frost Dates and Growing Seasons

Threshold Temperature
24 oF 28 oF 32 oF
Last freezing temperature in spring
March 7 April 2 April 22
First freezing temperature in fall
November 23 October 29 October 14
Length of growing season (days)
260 209 174

Growing Degree Days

Growing degree days for selected base temperatures (oF)

1948-2005 averages
Base Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
40 32 59 156 327 577 778 1054 1027 722 372 98 30 5232
45 6 16 61 189 423 628 89 872 572 230 34 6 3935
50 1 2 16 89 276 478 744 717 424 115 7 1 2870
55 0 0 2 34 153 331 589 562 283 46 1 0 2002
60 0 0 0 9 71 198 435 409 163 14 0 0 1299

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Shoshone County

Averages based on data collected at Kellogg, Idaho: elevation 2,320 feet.

Month

Temperature

oF

Precipitation

(inches)

average daily maximum

average daily minimum

monthly average

rain and melted snow

average snowfall

record max snowfall

average

record max

record min

Jan

34.9 20.3 27.6 3.77 8.48 0.57 18.8 70.6

Feb

41.0 23.4 32.0 2.81 7.34 0.00 9.9 35.5

Mar

48.9 28.3 38.6 2.92 6.45 0.69 5.5 21.5

Apr

58.7 33.7 46.2 2.35 5.76 0.35 0.7 9.0

May

68.0 40.3 54.1 2.57 5.93 0.14 0.0 1.2

Jun

75.2 46.3 60.8 2.21 4.93 0.34 0.0 1.0

Jul

85.2 49.8 67.5 1.02 4.62 0.00 0.0 0.0

Aug

84.1 48.0 66.1 1.13 4.60 0.00 0.0 0.0

Sep

73.7 41.9 57.8 1.72 5.94 0.03 0.0 4.0

Oct

60.0 34.8 47.3 2.66 7.23 0.01 0.3 5.5

Nov

44.0 28.7 36.3 3.78 7.93 0.08 5.0 23.5

Dec

35.9 23.0 29.5 3.86 12.28 0.43 13.9 55.9

 

Year

59.1 34.9 47.0 30.80 -- -- 54.1 ---

 

Record Extremes
    Maximum temperature: 111 oF: August 5, 1961
    Minimum temperature:-36 oF: December 30, 1968

    Max one-day precipitation (rain & melted snow): 4.00 inches: December 9, 1987

    Maximum snowfall (January-December): 124.3: 1996

 

Average Frost Dates and Growing Seasons

Threshold Temperature
24 o F 28 o F 32 o F
Last freezing temperature in spring
April 1 April 21 May 14
First freezing temperature in fall
October 27 October 11 September 24
Length of growing season (days)
208 173 133

Growing Degree Days

Growing degree days for selected base temperatures (oF)

1905-2005 averages
Base Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
40 4 9 57 200 439 623 852 808 534 242 34 7 3808
45 0 1 15 99 291 473 697 653 387 126 7 1 2749
50 0 0 2 41 169 327 542 498 250 51 1 0 1882
55 0 0 0 13 83 197 389 347 138 15 0 0 1183
60 0 0 0 3 32 98 246 210 61 2 0 0 653

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