Weather Averages Boise, ID

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Weather Averages for
Boise, ID



Latitude: 43°34'N, Longitude: 116°13'W, Elevation: 865.0 m, Distance: 4.03 km

  Unit Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average temperature
over 48 years
°C 10 -1 2 5 9 14 18 23 22 17 11 4 0
Average high temperature
over 48 years
°C 17 2 6 11 16 21 26 32 31 25 18 8 3
Average low temperature
over 48 years
°C 3 -5 -2 0 2 6 11 14 13 8 3 -1 -5
Highest recorded temperature
over 48 years
°C 43 17 21 27 33 36 40 43 43 38 34 23 18
Lowest recorded temperature
over 48 years
°C -31 -27 -26 -14 -7 -5 0 1 1 -5 -11 -19 -31
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 27°C
over 48 years
days 45 - - - - 1 6 18 16 3 - - -
Average precipitation
over 48 years
cm 30.0 3.6 2.8 3.0 3.0 3.0 2.3 0.8 0.8 1.5 1.8 3.6 3.6
Average dew point
over 41 years
°C 0 -6 -3 -2 0 3 5 6 5 3 0 -2 -4
Most recorded rainfall
over 48 years
cm 47.8 9.9 9.4 8.9 7.6 10.4 7.4 4.1 6.1 7.4 5.8 8.6 10.7
Least recorded rainfall
over 48 years
cm 16.8 0.3 0.5 0.5 0.3 - - - - - - 0.3 0.3
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
km/h 16.1 16.1 16.1 16.1 19.3 17.7 17.7 16.1 16.1 12.9 14.5 16.1 16.1
Average number of days below -1.5°C
over 48 years
days 124 26 20 18 8 2 - - - 1 6 18 26
Average snowfall
over 54 years
cm 53.1 17.3 9.1 4.3 1.5 0.3 - - - - 0.3 5.6 14.7
Average number of days above 14.5°C
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
cm - 2.5 - - - - - - - - - - 2.5
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 -15°C
over 48 years
days 6 3 1 - - - - - - - - - 2