Annual mean 7°C · wettest around September · prevailing wind W
Warmest
27.8 °C
Coldest
-4.1 °C
Wettest
50%
Windiest
7.6 m/s
Prevailing
W
5.6 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Great Falls over the whole year is 7°C. July is the hottest month, with highs of about 27°C; February is the coldest, with lows of about -7°C. The rainy (wet) season in Great Falls runs from September, peaking in September with a 42% chance of rain on a given day. The dry season is October to March; December is the driest month, at 20%. Winds in Great Falls are highest in November, averaging 5.9 m/s (21 km/h), and lightest in August, at 3.7 m/s (13 km/h). The prevailing wind is from the W. The clearest skies in Great Falls come in July, when the sky is typically 18% covered; February is the cloudiest month, at 46%.
Month by month Great Falls climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-1°C
-5°C
-8°C
22%
39%
5.7 m/s
0
0
1
February
-3°C
-7°C
-10°C
23%
46%
5.5 m/s
0
0
3
March
4°C
-3°C
-3°C
24%
41%
4.7 m/s
1
0
10
April
9°C
2°C
3°C
36%
43%
4.9 m/s
5
0
31
May
15°C
8°C
11°C
41%
42%
4.3 m/s
29
1
61
June
21°C
12°C
17°C
40%
31%
4.3 m/s
58
9
69
July
27°C
15°C
23°C
32%
18%
3.8 m/s
70
41
43
August
25°C
14°C
22°C
31%
23%
3.7 m/s
72
33
51
September
20°C
10°C
15°C
42%
31%
4.1 m/s
50
7
67
October
12°C
4°C
5°C
31%
36%
4.9 m/s
14
0
40
November
5°C
0°C
-3°C
24%
36%
5.9 m/s
0
0
10
December
-0°C
-4°C
-8°C
20%
40%
5.7 m/s
0
0
3
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Great Falls weather by season
Year round, Great Falls has days of about -3°C at their warmest in February, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -7°C to 15°C through the year, and the average temperature over the year is 7°C around the clock. Rain is most likely around September and least likely around December. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Great Falls weather in winterDecember to February
High -1°CLow -5°CRain 22%
Winter in Great Falls has typical daily highs of about -1°C and lows of about -5°C, with a 22% chance of rain on a given day.
Great Falls weather in springMarch to May
High 10°CLow 2°CRain 34%
Spring in Great Falls has typical daily highs of about 10°C and lows of about 2°C, with a 34% chance of rain on a given day.
Great Falls weather in summerJune to August
High 24°CLow 14°CRain 34%
Summer in Great Falls has typical daily highs of about 24°C and lows of about 14°C, with a 34% chance of rain on a given day.
Great Falls weather in autumnSeptember to November
High 12°CLow 5°CRain 33%
Autumn in Great Falls has typical daily highs of about 12°C and lows of about 5°C, with a 33% chance of rain on a given day.
When is the rainy season in Great Falls?
The rainy (wet) season in Great Falls runs from September, peaking in September with a 42% chance of rain on a given day. The dry season is October to March; December is the driest month, at 20%.
What time of year is Great Falls windiest?
Winds in Great Falls are highest in November, averaging 5.9 m/s (21 km/h), and lightest in August, at 3.7 m/s (13 km/h). The prevailing wind is from the W.
What is the average temperature in Great Falls year round?
The average temperature in Great Falls over the whole year is 7°C. July is the hottest month, with highs of about 27°C; February is the coldest, with lows of about -7°C.