Grantham monthly weather averages

Average daytime temperature

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

Grantham average temperature chart (Celsius) Grantham average temperature chart (Fahrenheit)
Average monthly temperatures in Grantham (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 5.8 6.1 8.9 11.5 15.3 18.6 20.5 20.3 17.8 13.9 8.9 6.6
°F 42.4 42.9 48.1 52.8 59.6 65.4 68.8 68.5 64 57 47.9 43.8

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.

Grantham monthly rainfall chart (mm) Grantham monthly rainfall chart (inches)
Average monthly rainfall in Grantham (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 51 41 49 51 53 54 49 62 49 47 55 54
inches 2 1.6 1.9 2 2.1 2.1 1.9 2.4 1.9 1.8 2.2 2.1
Rainy days 18 15 16 15 15 13 11 13 12 14 16 16

Average annual rainfall in Grantham: 666.734mm (262.5 inches)

Average daily sunshine

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

Grantham average daily sunshine chart
Average daily sunshine Grantham
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 2 2.5 3.7 4.8 6.5 7.1 6.2 6 5 3.7 2.5 1.9

Day / night temperatures

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

Grantham average minimum / maximum temperatures (Celsius) Grantham average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Grantham (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 0.3 0.2 1.5 3.3 6.1 9 10.9 10.9 9 6.4 2.8 1.1
Max °C 5.9 6.2 9.1 11.8 15.6 18.8 20.7 20.5 18 14.1 9 6.7
Min °F 32.5 32.4 34.7 37.9 42.9 48.2 51.6 51.6 48.2 43.4 37 34
Max °F 37.6 37.8 41.5 45.5 51.4 57 60.4 60.3 56.3 50.4 42.6 39

Sea temperature

The graph below shows the average sea temperature.

Grantham average sea temperature chart (Celsius) Grantham average sea temperature chart (Fahrenheit)
Average sea temperature around Grantham in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 7.6 6.7 6.8 7.9 9.9 12.5 14.9 16.2 15.5 13.5 11.2 9.1
°F 45.7 44.1 44.3 46.2 49.9 54.5 58.9 61.2 59.9 56.4 52.2 48.4

Wind speed

The graph below shows the average wind speed.

Grantham average winspeed by month (km/h) Grantham average winspeed by month (mph)
Average wind speed in Grantham (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 19 19 20 18 17 16 15 16 16 17 18 19
mph 12 12 12 11 11 10 9 10 10 10 11 12

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.

Grantham relative humidity averages
Average relative humidity in Grantham
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
91% 88% 83% 82% 81% 81% 80% 82% 84% 88% 90% 92%

Other monthly averages

UV index Best time to go?

Grantham weather stats

Grantham weather statistics
Hottest month: July 20.5°C 68.9°F
Driest month: February 41mm 1.6ins
Sunniest month: June 7.1hrs
Coldest month: January 5.8°C 42.4°F
Wettest month: August 62mm 2.4ins
Warmest sea: August 16.2°C 61.2°F
Map showing location of Grantham (52.91149, -0.64184) Grantham map pin © Google

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