The bar chart below shows the average monthly peak daytime temperatures at Harpenden
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
°C | 6 | 6.4 | 9.1 | 11.9 | 15.9 | 19.1 | 21.1 | 20.9 | 18.1 | 14.3 | 9.3 | 6.9 |
°F | 42.8 | 43.5 | 48.4 | 53.5 | 60.6 | 66.3 | 70 | 69.6 | 64.6 | 57.7 | 48.7 | 44.5 |
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 | 63 | 45 | 56 | 52 | 54 | 57 | 48 | 55 | 56 | 65 | 64 | 69 |
inches | 2.5 | 1.8 | 2.2 | 2.1 | 2.1 | 2.2 | 1.9 | 2.1 | 2.2 | 2.5 | 2.5 | 2.7 |
Rainy days | 18 | 14 | 16 | 15 | 14 | 12 | 12 | 13 | 12 | 15 | 17 | 17 |
Average annual rainfall in Harpenden: 734.033mm (289 inches)
The bar chart below shows the average daily sunshine hours in Harpenden
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Hrs sunshine | 1.9 | 2.6 | 3.8 | 5.1 | 6.6 | 7.1 | 6.6 | 6.4 | 5.2 | 3.8 | 2.5 | 1.8 |
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 | 0.7 | 0.7 | 1.9 | 3.7 | 6.5 | 9.5 | 11.5 | 11.3 | 9.5 | 7 | 3.2 | 1.6 |
Max °C | 6.2 | 6.6 | 9.3 | 12.2 | 16.1 | 19.3 | 21.4 | 21.1 | 18.4 | 14.5 | 9.4 | 7.1 |
Min °F | 33.2 | 33.2 | 35.4 | 38.6 | 43.7 | 49.1 | 52.6 | 52.3 | 49 | 44.5 | 37.8 | 34.8 |
Max °F | 38.1 | 38.5 | 42.1 | 46.2 | 52.3 | 57.9 | 61.5 | 61.2 | 57 | 51.3 | 43.3 | 39.7 |
The graph below shows the average sea temperature.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
°C | 8.9 | 7.9 | 7.9 | 9.1 | 11 | 13.3 | 15.5 | 17 | 17 | 15.6 | 13.2 | 10.7 |
°F | 48 | 46.2 | 46.2 | 48.4 | 51.8 | 55.9 | 59.9 | 62.6 | 62.6 | 60 | 55.7 | 51.3 |
The graph below shows the average wind speed.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
km/h | 16 | 16 | 16 | 15 | 14 | 13 | 13 | 13 | 13 | 13 | 15 | 16 |
mph | 10 | 10 | 10 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 9 | 10 |
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 |
---|---|---|---|---|---|---|---|---|---|---|---|
91% | 88% | 83% | 79% | 78% | 77% | 77% | 79% | 83% | 88% | 91% | 92% |
Hottest month: | July | 21.1°C 70°F |
---|---|---|
Driest month: | February | 45mm 1.8ins |
Sunniest month: | August | 6.4hrs |
Coldest month: | January | 6°C 42.8°F |
Wettest month: | December | 69mm 2.7ins |
Warmest sea: | August | 17°C 62.6°F |