The bar chart below shows the average monthly peak daytime temperatures at Helena
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
°C | -1.3 | 2.2 | 6.1 | 12 | 17.3 | 22.8 | 27.9 | 27.1 | 20 | 14 | 5.2 | -0.5 |
°F | 29.6 | 35.9 | 43.1 | 53.5 | 63.1 | 73.1 | 82.3 | 80.7 | 67.9 | 57.3 | 41.3 | 31 |
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.
The graph below shows the average rainfall and number of rainy days per month.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
mm | 17 | 12 | 21 | 28 | 51 | 55 | 33 | 34 | 30 | 19 | 16 | 16 |
inches | 0.7 | 0.5 | 0.8 | 1.1 | 2 | 2.2 | 1.3 | 1.3 | 1.2 | 0.7 | 0.6 | 0.6 |
Rainy days | 9 | 7 | 10 | 9 | 11 | 10 | 7 | 8 | 8 | 6 | 8 | 9 |
Average annual rainfall in Helena: 264.8mm (104.3 inches)
The bar chart below shows the average daily sunshine hours in Helena
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Hrs sunshine | 4.4 | 5.9 | 7.9 | 8.7 | 9.6 | 11 | 12.8 | 11.2 | 9.1 | 7.2 | 4.4 | 3.7 |
The graph below shows the daily range of temperatures for each month.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Min °C | -12.8 | -9.7 | -6.3 | -1.7 | 3.2 | 7.8 | 10.5 | 9.5 | 4.1 | -0.8 | -6.9 | -12 |
Max °C | -1.1 | 2.5 | 6.5 | 12.3 | 17.6 | 23.2 | 28.4 | 27.5 | 20.4 | 14.4 | 5.5 | -0.3 |
Min °F | 9.1 | 14.6 | 20.8 | 28.9 | 37.8 | 46 | 50.8 | 49.1 | 39.3 | 30.6 | 19.7 | 10.5 |
Max °F | 19.6 | 25.5 | 32.2 | 41.5 | 50.7 | 59.9 | 66.9 | 65.3 | 54 | 44.2 | 30.7 | 21 |
The graph below shows the average sea temperature.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
°C | 7.7 | 7.6 | 7.8 | 8.2 | 9.2 | 10.8 | 12.8 | 14.3 | 13.7 | 11.7 | 9.7 | 8.3 |
°F | 45.9 | 45.7 | 46 | 46.8 | 48.5 | 51.5 | 55 | 57.8 | 56.7 | 53 | 49.4 | 46.9 |
The graph below shows the average wind speed.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
km/h | 14 | 14 | 16 | 17 | 16 | 15 | 14 | 13 | 14 | 14 | 14 | 14 |
mph | 9 | 9 | 10 | 11 | 10 | 9 | 9 | 8 | 9 | 9 | 9 | 9 |
A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.
The graph below shows the average relative humidity.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|
67% | 65% | 61% | 54% | 55% | 53% | 47% | 48% | 55% | 58% | 66% | 69% |
Hottest month: | July | 27.9°C 82.2°F |
---|---|---|
Driest month: | February | 12mm 0.5ins |
Sunniest month: | July | 12.8hrs |
Coldest month: | January | -1.3°C 29.7°F |
Wettest month: | June | 55mm 2.2ins |
Warmest sea: | August | 14.3°C 57.7°F |