Castlerock monthly weather averages

Contents

Average daytime temperature

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

Castlerock average temperature chart (Celsius) Castlerock average temperature chart (Fahrenheit)
Average monthly temperatures in Castlerock (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 6.2 6.3 8.2 10.6 13.3 16 17.1 17.1 15 12.4 8.6 7
°F 43.2 43.4 46.8 51 55.9 60.7 62.7 62.7 59.1 54.2 47.4 44.6

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.

Average rainfall & rainy days

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

Castlerock monthly rainfall chart (mm) Castlerock monthly rainfall chart (inches)
Average monthly rainfall in Castlerock (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 128 90 99 69 77 73 79 96 109 128 117 119
inches 5 3.5 3.9 2.7 3 2.9 3.1 3.8 4.3 5 4.6 4.7
Rainy days 23 18 21 17 17 17 18 20 21 22 22 22

Average annual rainfall in Castlerock: 1230.233mm (484.3 inches)

Average daily sunshine

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

Castlerock average daily sunshine chart
Average daily sunshine Castlerock
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 1.5 2.5 3.3 5.3 6.1 5.7 4.6 4.5 3.7 2.8 2 1.2

Day / night temperatures

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

Castlerock average minimum / maximum temperatures (Celsius) Castlerock average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Castlerock (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 0.9 0.8 1.9 3.1 5.3 8.1 10 9.8 8.2 6.3 2.9 1.9
Max °C 6.4 6.5 8.4 10.8 13.5 16.2 17.3 17.3 15.2 12.5 8.7 7.2
Min °F 33.5 33.4 35.3 37.5 41.5 46.5 49.9 49.6 46.8 43.3 37.2 35.3
Max °F 38.5 38.5 41.2 44.4 48.9 53.8 56.5 56.3 53.1 48.9 42.4 40.1

Sea temperature

The graph below shows the average sea temperature.

Castlerock average sea temperature chart (Celsius) Castlerock average sea temperature chart (Fahrenheit)
Average sea temperature around Castlerock in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.7 7.9 7.8 8.5 10 11.9 13.5 14.3 14 13 11.6 10.1
°F 47.7 46.2 46.1 47.4 50 53.5 56.3 57.8 57.2 55.4 52.8 50.1

Wind speed

The graph below shows the average wind speed.

Castlerock average winspeed by month (km/h) Castlerock average winspeed by month (mph)
Average wind speed in Castlerock (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 27 26 26 22 21 19 19 19 22 24 25 26
mph 17 16 16 14 13 12 12 12 14 15 16 16

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.

Castlerock relative humidity averages
Average relative humidity in Castlerock
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
91% 88% 87% 85% 84% 85% 87% 88% 90% 91% 91% 92%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Castlerock weather stats

Castlerock weather statistics
Hottest month: July 17.1°C 62.8°F
Driest month: April 69mm 2.7ins
Sunniest month: May 6.1hrs
Coldest month: January 6.2°C 43.2°F
Wettest month: January 128mm 5ins
Warmest sea: August 14.3°C 57.7°F
Map showing location of Castlerock (55.15, -6.78333) Castlerock map pin © Google

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