Great Falls (MT) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Great Falls

Great Falls average temperature chart (Celsius) Great Falls average temperature chart (Fahrenheit)
Average monthly temperatures in Great Falls (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -1.7 3 5.5 12.2 17.7 22.8 27.8 27.4 20.6 15 6.4 0.1
°F 28.9 37.4 41.8 54 63.8 73 82 81.2 69 59.1 43.5 32.3

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Great Falls monthly rainfall chart (mm) Great Falls monthly rainfall chart (inches)
Average monthly rainfall in Great Falls (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 20 14 23 31 63 71 34 36 26 19 16 18
inches 0.8 0.6 0.9 1.2 2.5 2.8 1.3 1.4 1 0.7 0.6 0.7
Rainy days 9 7 9 9 12 11 7 8 7 5 6 9

Average annual rainfall in Great Falls: 307.833mm (121.2 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Great Falls

Great Falls average daily sunshine chart
Average daily sunshine Great Falls
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 4.5 5.9 8.1 8.8 10 11.4 13.1 11.5 9.1 7.1 4.7 3.9

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Great Falls average minimum / maximum temperatures (Celsius) Great Falls average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Great Falls (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -12.2 -8.1 -6 -0.4 4.6 9.1 11.6 11.1 6.3 2.1 -4.7 -10.2
Max °C -1.5 3.3 5.8 12.6 18 23.1 28.2 27.8 20.9 15.4 6.7 0.4
Min °F 10.1 17.5 21.3 31.4 40.3 48.4 52.9 51.9 43.3 35.7 23.6 13.6
Max °F 19.8 27.7 31.8 43 52.3 61 67.8 66.9 56.5 47.7 33.8 23.2

Sea temperature

The graph below shows the average sea temperature.

Great Falls average sea temperature chart (Celsius) Great Falls average sea temperature chart (Fahrenheit)
Average sea temperature around Great Falls in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 7.1 7 7.2 7.6 8.6 10.3 12.3 14 13.3 11.2 9.1 7.7
°F 44.8 44.6 44.9 45.8 47.5 50.6 54.2 57.2 56 52.1 48.3 45.8

Wind speed

The graph below shows the average wind speed.

Great Falls average winspeed by month (km/h) Great Falls average winspeed by month (mph)
Average wind speed in Great Falls (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 22 21 19 20 18 17 16 16 17 19 21 22
mph 14 13 12 12 11 11 10 10 11 12 13 14

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Great Falls relative humidity averages
Average relative humidity in Great Falls
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
64% 63% 61% 54% 54% 52% 46% 47% 54% 54% 60% 64%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Great Falls weather stats

Great Falls weather statistics
Hottest month: July 27.8°C 82°F
Driest month: February 14mm 0.6ins
Sunniest month: July 13.1hrs
Coldest month: January -1.7°C 28.9°F
Wettest month: June 71mm 2.8ins
Warmest sea: August 14°C 57.2°F
Map showing location of Great Falls (47.50024, -111.30081) Great Falls map pin © Google

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