Harpenden monthly weather averages

Average daytime temperature

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

Harpenden average temperature chart (Celsius) Harpenden average temperature chart (Fahrenheit)
Average monthly temperatures in Harpenden (degrees centigrade and fahrenheit)
  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.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Harpenden monthly rainfall chart (mm) Harpenden monthly rainfall chart (inches)
Average monthly rainfall in Harpenden (mm and inches)
  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)

Average daily sunshine

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

Harpenden average daily sunshine chart
Average daily sunshine 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

Day / night temperatures

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

Harpenden average minimum / maximum temperatures (Celsius) Harpenden average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Harpenden (degrees centigrade and fahrenheit)
  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

Sea temperature

The graph below shows the average sea temperature.

Harpenden average sea temperature chart (Celsius) Harpenden average sea temperature chart (Fahrenheit)
Average sea temperature around Harpenden in degrees centigrade and fahrenheit
  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

Wind speed

The graph below shows the average wind speed.

Harpenden average winspeed by month (km/h) Harpenden average winspeed by month (mph)
Average wind speed in Harpenden (mph and kmh)
  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.

Relative humidity

The graph below shows the average relative humidity.

Harpenden relative humidity averages
Average relative humidity in Harpenden
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
91% 88% 83% 79% 78% 77% 77% 79% 83% 88% 91% 92%

Other monthly averages

UV index Best time to go?

Harpenden weather stats

Harpenden weather statistics
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
Map showing location of Harpenden (51.81684, -0.35706) Harpenden map pin © Google

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