Roundup (MT) monthly weather averages

Contents

Average daytime temperature

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

Roundup average temperature chart (Celsius) Roundup average temperature chart (Fahrenheit)
Average monthly temperatures in Roundup (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -0.3 3.6 7.6 13.8 19.1 24.8 29.5 28.8 21.7 15.9 6.9 1.2
°F 31.4 38.5 45.7 56.8 66.4 76.6 85.1 83.9 71.1 60.7 44.4 34.2

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.

Roundup monthly rainfall chart (mm) Roundup monthly rainfall chart (inches)
Average monthly rainfall in Roundup (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 18 13 24 40 73 63 31 33 35 26 17 17
inches 0.7 0.5 0.9 1.6 2.9 2.5 1.2 1.3 1.4 1 0.7 0.6
Rainy days 8 7 9 9 11 11 7 7 7 6 6 8

Average annual rainfall in Roundup: 326.434mm (128.5 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Roundup

Roundup average daily sunshine chart
Average daily sunshine Roundup
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 4.8 6.2 8.3 9.2 10 11.3 12.7 11.6 9.2 7.2 4.8 4.4

Day / night temperatures

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

Roundup average minimum / maximum temperatures (Celsius) Roundup average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Roundup (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -12.2 -8.7 -5.3 -0.3 4.8 9.5 12.5 11.6 6.1 1.3 -5.4 -10.5
Max °C -0 3.9 7.9 14.1 19.5 25.2 29.9 29.3 22.1 16.3 7.2 1.5
Min °F 10.1 16.3 22.5 31.5 40.6 49 54.5 52.8 43 34.3 22.3 13.1
Max °F 21 27.7 34.3 44.4 53.8 63.1 70.2 68.7 57.4 47.8 33.6 23.9

Sea temperature

The graph below shows the average sea temperature.

Roundup average sea temperature chart (Celsius) Roundup average sea temperature chart (Fahrenheit)
Average sea temperature around Roundup in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 7.4 7.2 7.4 8 9 10.8 12.9 14.8 14.1 11.7 9.5 8
°F 45.2 45 45.4 46.3 48.3 51.4 55.2 58.7 57.4 53.1 49.1 46.3

Wind speed

The graph below shows the average wind speed.

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

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.

Roundup relative humidity averages
Average relative humidity in Roundup
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
63% 62% 61% 55% 55% 53% 47% 46% 53% 54% 61% 64%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Roundup weather stats

Roundup weather statistics
Hottest month: July 29.5°C 85.1°F
Driest month: February 13mm 0.5ins
Sunniest month: July 12.7hrs
Coldest month: January -0.3°C 31.5°F
Wettest month: May 73mm 2.9ins
Warmest sea: August 14.8°C 58.6°F
Map showing location of Roundup (46.44524, -108.5418) Roundup map pin © Google

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