LAST year was the fourth hottest year on record, with the Island experiencing an average temperature of 13.3°C.
A dark red stripe will be added to the Climate Wall mural at the Waterfront to mark this.
Last year was also the fourth sunniest since records began in 1925, with only two months in 2025 falling below their average monthly temperature.
The warmest spring and warmest June on record were both recorded in 2025.
A heatwave was recorded from 19 to 21 June, during which temperatures exceeded 30°C.
The hottest day of the year took place on 30 June, when temperatures hit 33.4°C.
Sea temperatures were also up last year, with the average temperature of 13.5°C exceeding the 30-year average of 12.9°C.
Sea temperatures reached the second warmest on record during the summer months.
Annual rainfall was shown to have decreased from the 30-year average, despite 2025 having the wettest January on record.
Jersey Met head of meteorology Paul Aked said: “The 2025 temperature detail confirms that the year joins some of the warmest years on official record.
“Nine of the 10 warmest years have been recorded since the year 2000, and is further evidence that our climate is changing and warming.
“The changes are small, however they continue to show, as climate science tells us, that our climate is warming.”
Mr Aked added: “While climate science indicates that we should expect to see more years that are warmer than average in the future, it does not mean every year will be a record breaker.
“If we look at the warming stripes, we can see through the 132 years of official temperature records for the Island far more red colour in the more recent years.”
