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Information and public services for the Island of Jersey

L'înformâtion et les sèrvices publyis pouor I'Île dé Jèrri

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Climate statistics

Summary of the weather data for 2020

2020 was warmer, wetter and sunnier than average.

​Temperatures​​​

The mean daily air temperature for the year was 13.23°C. This makes 2020 the 2nd warmest year since records began in 1894.

The record warmest year was 2014 with a mean daily air temperature of 13.34°C.

The highest maximum air temperature recorded during 2020 was 35.3°C on 7 August, the 4th hottest day in the Island since records began.

The lowest minimum air temperature recorded during 2020 was 1.7°C on 22 January.

Rainfall​​

The rainfall total for the year was 1,178.7mm, making 2020 the wettest year since records began in 1894.

200 rainfall days were recorded, with 0.2mm of rainfall or more. This compares with a 30 year average of 188.1 days per year.

The wettest day of the year was 11 June with 38.6mm of precipitation recorded.

Sunshine​​

The sunshine total for the year was 2,392.2 hours. 2020 was the 2nd sunniest year since records begain in 1894.

The sunniest year on record was 2010 with 2,403.2 hours of sunshine.

Sea temperature​

The mean daily sea temperature during 2020 was 13.45°C.

Jersey monthly air temperature and rainfall in 2020

 

Source: Jersey Met, download monthly air temperature data from 1894 and download monthly rainfall data from 1894

Sunrise and sunset times for Jersey in 2020 (GMT)

 

Source: Jersey Met, download the sunrise and sunset times since 2015

​​Long-term weather averages

The long-term annual weather averages for the period 1981-2010 were:

  • mean daily air temperature of 12.09°C
  • 1986.1 hours of sunshine per year
  • 874.7mm of rainfall per year
  • mean daily sea temperature of 12.73°C
  • mean daily air pressure of 1,016.8mb

Temperature, sunshine and rainfall, monthly averages for the period 1981 to 2010

MonthDaily air temperature (°C Celsius)Daily sunshine (hours)Monthly rainfall (millimetres)Daily air pressure (millibars)​
January6.62.392.41016.7​
February6.53.470.81017.1​
March8.54.569.41017.0​
April10.46.856.21015.2​
May13.57.854.71015.8​
June16.18.548.21017.7​
July18.18.544.31018.3​
August18.37.951.31017.8​
September16.56.462.71016.4​
October13.44.0104.71015.6​
November9.92.8106.31016.3​
Decemeber7.32.2113.71017.2​
Monthly mean 12.1 5.4 72.9 1016.8


Source: Jersey Met, download monthly air temperature data from 1894 and download monthly rainfall data from 1894

Average annual air temperatures in Jersey since 1900

Jersey Met air temperature stripes.png

Source: Jersey Met, download the chart data

The average (mean) temperature for the 2010s was 12.5°C. This is 1.5°C higher than for the 1900s, which had an average temperature of 11.0°C.

Average annual rainfall in Jersey (millimetres)

 

Source: Jersey Met, download the chart data

Further information

Maison St Louis Observatory has recorded meteorological data since 1 January 1894. 

The observatory makes an important contribution to studies of climate change and its impact on the Channel Islands.

Records of meteorological elements are also made at several other on-Island and offshore sites.

Data referred to on this page has been recorded at the following sites:

  • temperature and rainfall at the Maison St. Louis Observatory
  • sunshine at the Fort Regent Signal Station
  • sea temperature at St. Helier Harbour

The Jersey Met provide live weather updates, as well as a daily weather summary. Environmental Health provide live air quality updates. The Jersey Met also provide weather forecasts for six days into the future.

Monthly weather data​ from 2009 onwards is available on the Jersey Met climate page.​ Information on the climate crisis and the government response to it can be found on the climate emergency page.

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