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 three 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.
The average temperature in January was 8.5oC, 2.6oC up on the year before and 1.9oC up on the thirty-year average. Rainfall totalled 150mm for the month, which is a double the amount of rain that fell in January of 2017. amount of rainfall in January 2018 was roughly 60% more than the seasonal norm.
Looking at the number of hours of sunshine we find that the total of 69.9 hours, some 37 hours down on January 2017 but only one-hour fewer than one might expect based on the thirty-year average.
In summary, the January weather was a lot wetter than is the norm, considerably milder than would be expected but with roughly the typical amounts of sunshine.
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 January there were six days when no sunshine was recorded with a further eight days when the sun shone for an hour or less.
The lowest minimum temperature was around 4oC, with multiple days seeing lows of this value, while 2nd January saw the warmest temperature at 13oC.
There were just four days with no recorded rainfall and ten days with only trace amounts. The wettest day of the month was 3rd January with 19mm.