Fort Benton (MT) monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Fort Benton

Fort Benton average temperature chart (Celsius) Fort Benton average temperature chart (Fahrenheit)
Average monthly temperatures in Fort Benton (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -2.3 2.4 5.4 12.5 18 23.2 28.1 27.8 20.7 15.2 6.1 -0.3
°F 27.8 36.4 41.7 54.5 64.4 73.8 82.6 82 69.3 59.3 42.9 31.4

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.

Fort Benton monthly rainfall chart (mm) Fort Benton monthly rainfall chart (inches)
Average monthly rainfall in Fort Benton (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 17 12 19 28 62 72 35 36 27 18 13 15
inches 0.7 0.5 0.7 1.1 2.4 2.8 1.4 1.4 1 0.7 0.5 0.6
Rainy days 8 6 8 8 11 10 7 7 7 5 5 8

Average annual rainfall in Fort Benton: 289.9mm (114.1 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Fort Benton

Fort Benton average daily sunshine chart
Average daily sunshine Fort Benton
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 4.6 6.1 8.2 9.1 10.4 11.8 13.4 11.8 9.3 7.2 4.8 4.1

Day / night temperatures

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

Fort Benton average minimum / maximum temperatures (Celsius) Fort Benton average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Fort Benton (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -13.2 -8.9 -6.3 -0.6 4.5 9.1 11.5 11 5.9 1.5 -5.6 -11.2
Max °C -2.1 2.7 5.7 12.8 18.4 23.6 28.5 28.2 21.1 15.5 6.4 -0
Min °F 8.3 16 20.7 30.9 40 48.3 52.7 51.8 42.6 34.7 22 11.9
Max °F 18.3 26.4 31.5 43 52.5 61.3 68 67.3 56.3 47.3 32.7 21.9

Sea temperature

The graph below shows the average sea temperature.

Fort Benton average sea temperature chart (Celsius) Fort Benton average sea temperature chart (Fahrenheit)
Average sea temperature around Fort Benton in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 7 6.9 7.1 7.6 8.6 10.3 12.3 14.1 13.4 11.2 9 7.6
°F 44.6 44.4 44.7 45.6 47.4 50.5 54.2 57.4 56.1 52.1 48.2 45.6

Wind speed

The graph below shows the average wind speed.

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

Fort Benton relative humidity averages
Average relative humidity in Fort Benton
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
65% 64% 62% 55% 54% 53% 47% 47% 54% 54% 61% 65%