Weather Averages Boise, ID

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Weather Averages for
Boise, ID


Latitude: 43°34'N, Longitude: 116°13'W, Elevation: 2838.0 ft, Distance: 6.49 mi

  Unit Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average temperature
over 48 years
°F 51 28 36 42 48 57 66 73 73 62 51 39 31
Average high temperature
over 48 years
°F 62 36 44 53 62 71 80 89 87 78 64 48 37
Average low temperature
over 48 years
°F 39 21 26 31 37 44 51 57 57 48 39 30 23
Highest recorded temperature
over 48 years
°F 111 62 69 80 91 98 105 111 109 100 93 73 64
Lowest recorded temperature
over 48 years
°F -25 -16 -14 6 19 21 31 35 34 23 10 -2 -25
Average number of rainy days
over 54 years
days 90 12 10 10 8 8 6 2 3 4 6 10 11
Average number of days above 90°F
over 48 years
days 45 - - - - 1 6 18 16 3 - - -
Average precipitation
over 48 years
in 11.8 1.4 1.1 1.2 1.2 1.2 0.9 0.3 0.3 0.6 0.7 1.4 1.4
Average dew point
over 41 years
°F 33 21 26 28 31 37 42 44 42 37 33 28 24
Most recorded rainfall
over 48 years
in 18.8 3.9 3.7 3.5 3.0 4.1 2.9 1.6 2.4 2.9 2.3 3.4 4.2
Least recorded rainfall
over 48 years
in 6.6 0.1 0.2 0.2 0.1 - - - - - - 0.1 0.1
Average number of days with thunderstorms
over 48 years
days 14 - - 1 1 3 3 2 3 1 - - -
Average number of days with fog
over 48 years
days 52 14 8 3 2 1 1 - - 1 2 7 13
Average morning relative humidity
over 41 years
% 68 81 80 75 69 65 59 48 50 58 67 77 81
Average evening relative humidity
over 41 years
% 42 68 58 45 35 34 29 22 23 28 36 55 67
Average wind speed
over 41 years
mph 10.0 10.0 10.0 10.0 12.0 11.0 11.0 10.0 10.0 8.0 9.0 10.0 10.0
Average number of days below 32°F
over 48 years
days 124 26 20 18 8 2 - - - 1 6 18 26
Average snowfall
over 54 years
in 20.9 6.8 3.6 1.7 0.6 0.1 - - - - 0.1 2.2 5.8
Average number of days above 65°F
over 48 years
days 169 - - 3 10 22 28 31 31 27 16 1 -
Average number of clear days
over 54 years
days 120 4 5 6 6 9 12 21 18 17 12 6 5
Average snow cover
over 59 years
in - 1.0 - - - - - - - - - - 1.0
Heating degree days
over 30 years
days 5861 1116 815 701 477 242 75 6 20 160 414 753 1082
Cooling degree days
over 30 years
days 754 - - - - 9 120 285 252 88 - - -
Average possibility of sunshine
over 51 years
% 64 40 51 62 68 72 76 87 85 81 69 43 39
Average number of cloudy days
over 54 years
days 155 22 17 18 15 12 8 3 5 6 11 18 20
Average number of partly cloudy days
over 54 years
days 90 5 6 7 9 10 10 7 8 7 8 6 6
Average number of days below 5°F
over 48 years
days 6 3 1 - - - - - - - - - 2