Summary of the weather data for 2017
2017 was warmer, wetter and sunnier than average.
Temperatures
The mean daily air temperature for the year was 12.72°C.
The record warmest year was 2014 with a mean daily air temperature of 13.34°C.
The highest maximum air temperature recorded during 2017 was 31.4°C on 20th June, the 47th hottest day in the Island since records began.
The lowest minimum was -2.7°C on 21st January.
Rainfall
The rainfall total for the year was 1055.2mm.
215 rainfall days were recorded, with 0.2mm of rainfall or more.
The wettest day of the year was 31st August with 36.0mm of precipitation recorded.
Sunshine
The sunshine total for the year was 2165.0 hours.
The sunniest year on record was 2010 with 2403.2 hours of sunshine.
Sea temperature
The mean daily sea temperature during 2017 was 13.35°C.
The highest sea temperature recorded during the year was 18.9°C on 29th August.
The lowest was 8.0°C on the 12th and 13th of February.
Jersey monthly temperature and rainfall in 2017
Source: Jersey Met, download the chart data
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
Temperature, sunshine and rainfall, monthly averages for the period 1981 to 2010
| Jan | 6.6 | 2.3 | 92.4 |
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| Feb | 6.5 | 3.4 | 70.8 |
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| Mar | 8.5 | 4.5 | 69.4 |
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| Apr | 10.4 | 6.8 | 56.2 |
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| May | 13.5 | 7.8 | 54.7 |
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| Jun | 16.1 | 8.5 | 48.2 |
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| Jul | 18.1 | 8.5 | 44.3 |
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| Aug | 18.3 | 7.9 | 51.3 |
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| Sep | 16.5 | 6.4 | 62.7 |
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| Oct | 13.4 | 4.0 | 104.7 |
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| Nov | 9.9 | 2.8 | 106.3 |
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| Dec | 7.3 | 2.2 | 113.7 |
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Source: Jersey Met
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
You can find monthly weather data from 2009 onwards by following the link below.
Jersey climate
gov.je