December 2018 Weather Round-Up

The day-to-day weather has very little impact on the volume of visits to Jersey, but can play a major role in influencing the types of activities that visitors who are here do, and thereby, the amount of money that they spend.  Some attractions and activity providers thrive only when the sun shines, others see higher patronage on rainy days.

The following tables show the monthly profile of temperatures, rainfall and sunshine over the past few years, the annual change, and finally the variance to the thirty-year average.  When looking at the monthly figures warmer temperatures, drier weather and higher sunshine hours are shaded green, and when looking at comparisons a warmer, drier and sunnier relative outcome is shaded green.

December Weather

December 2018

December saw fewer hours of sunshine than any month in the past four years, however it was notably milder than normal for the time of year with fairly typical amounts of rainfall.

The average temperature in December was 9.2°C, which was 1.0°C warmer than the year before and 1.9°C above the thirty-year average.  Rainfall totalled 109mm for the month, 73mm drier than the especially wet December of last year and 5mm less rainfall than the seasonal norm.

Looking at the number of hours of sunshine we find that the total of just 50.4 hours, meaning that December saw 6 less hours than was the case twelve months before and 17 hours less than the thirty-year average.

Averages can be misleading – you can have many values that are a bit below normal being offset by a single value that is significantly above normal.  In meteorological terms for example you could have a month during which 28 days see not a drop of rain, but three days of torrential downpours.  Statistically this might lead to an ‘average’ amount of rainfall for the month, but most visitors would not have experienced ‘average’ weather.

Looking at December there were no fewer than twelve days with no recorded sunshine at all, and five further days with less than an hour.  The sunniest day was 17 December with a shade over six hours.  The lowest minimum temperature was around 0°C on 14 of the month, while 02 December got the accolade for warmest day of the month at 14°C.

There were 9 days on which no recorded rain fell with a further six days on which only trace amounts fell. The wettest day of the month was the 08 December with 11mm.

December Weather Data