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 | 8.6 | 11.4 | 16.9 | 22.6 | 27.1 | 31.4 | 33.1 | 32.3 | 29 | 23.5 | 16.8 | 10.9 |
°F | 47.4 | 52.5 | 62.4 | 72.6 | 80.7 | 88.5 | 91.5 | 90.1 | 84.1 | 74.2 | 62.3 | 51.6 |
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 | 107 | 120 | 131 | 134 | 136 | 101 | 96 | 75 | 85 | 76 | 125 | 135 |
inches | 4.2 | 4.7 | 5.2 | 5.3 | 5.3 | 4 | 3.8 | 3 | 3.4 | 3 | 4.9 | 5.3 |
Rainy days | 10 | 9 | 10 | 10 | 10 | 8 | 9 | 8 | 8 | 6 | 9 | 10 |
Average annual rainfall in Helena: 1265.2mm (498.1 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 | 5.9 | 6.7 | 7.7 | 9.2 | 10.4 | 11.5 | 11.2 | 10.5 | 9 | 8.6 | 6.3 | 5.5 |
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 | -1.6 | 0.6 | 5.3 | 10.6 | 15.5 | 19.8 | 21.7 | 20.5 | 17 | 10 | 5.3 | 0.7 |
Max °C | 8.8 | 11.7 | 17.2 | 22.9 | 27.4 | 31.7 | 33.4 | 32.6 | 29.3 | 23.8 | 17.1 | 11.2 |
Min °F | 29.1 | 33 | 41.5 | 51 | 59.8 | 67.6 | 71 | 68.8 | 62.5 | 50 | 41.5 | 33.2 |
Max °F | 38.5 | 43 | 52.2 | 62.1 | 70.5 | 78.3 | 81.5 | 79.7 | 73.6 | 62.4 | 52.2 | 42.6 |
The graph below shows the average sea temperature.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
°C | 13.6 | 13.2 | 14 | 16 | 18.8 | 21.7 | 24.1 | 25.9 | 24.5 | 20.8 | 17.5 | 15.2 |
°F | 56.5 | 55.8 | 57.3 | 60.7 | 65.8 | 71.1 | 75.4 | 78.6 | 76.1 | 69.4 | 63.5 | 59.4 |
The graph below shows the average wind speed.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
km/h | 15 | 16 | 17 | 16 | 14 | 12 | 12 | 11 | 12 | 12 | 14 | 15 |
mph | 9 | 10 | 11 | 10 | 9 | 8 | 7 | 7 | 7 | 8 | 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 |
---|---|---|---|---|---|---|---|---|---|---|---|
70% | 68% | 65% | 65% | 69% | 69% | 71% | 72% | 73% | 69% | 70% | 71% |
Hottest month: | July | 33.1°C 91.6°F |
---|---|---|
Driest month: | August | 75mm 3ins |
Sunniest month: | June | 11.5hrs |
Coldest month: | January | 8.6°C 47.5°F |
Wettest month: | May | 136mm 5.4ins |
Warmest sea: | August | 25.9°C 78.6°F |