December weather forecastSaint Johns, Guernsey
December
Weather in December
The first month of the winter, December, is still a cool month in Saint Johns, Guernsey, with an average temperature ranging between max 11.1°C (52°F) and min 9.2°C (48.6°F).Temperature
Saint Johns experiences an average high-temperature of a fresh 11.1°C (52°F) in December, subtly different from November's 13°C (55.4°F). In Saint Johns, the nighttime temperature in December descends gently to an average of 9.2°C (48.6°F).Humidity
The months with the lowest humidity in Saint Johns are November and December, with an average relative humidity of 77%.Rainfall
In Saint Johns, Guernsey, in December, it is raining for 21.4 days, with typically 70mm (2.76") of accumulated precipitation. In Saint Johns, Guernsey, during the entire year, the rain falls for 196.3 days and collects up to 557mm (21.93") of precipitation.Snowfall
In Saint Johns, Guernsey, snow does not fall in February through December.Daylight
December has the shortest days of the year, with an average of 8h and 12min of daylight.On the first day of December, sunrise is at 07:45 and sunset at 16:13. On the last day of the month, sunrise is at 08:06 and sunset at 16:20 GMT.
Sunshine
January, November and December, with an average of 3.9h of sunshine, are months with the least sunshine.UV index
In December, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A typical high UV index of 3 in December suggests the following recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Saint Johns, Guernsey
- Average high temperature in December: 11.1°C
The warmest month (with the highest average high temperature) is August (17.8°C).
The month with the lowest average high temperature is February (9.2°C).
- Average low temperature in December: 9.2°C
The month with the highest average low temperature is August (15.8°C).
The coldest month (with the lowest average low temperature) is February (7°C).
Average pressure in December
Saint Johns, Guernsey
- Average pressure in December: 1016.5mbar
The month with the highest atmospheric pressure is September (1017.9mbar).
The month with the lowest atmospheric pressure is November (1011.5mbar).
Average wind speed in December
Saint Johns, Guernsey
- Average wind speed in December: 36km/h
The windiest month (with the highest average wind speed) is December (36km/h).
The calmest month (with the lowest average wind speed) is July (21.9km/h).
Average humidity in December
Saint Johns, Guernsey
- Average humidity in December: 77%
The months with the highest relative humidity are June and July (84%).
The months with the lowest relative humidity are November and December (77%).
Average rainfall in December
Saint Johns, Guernsey
- Average rainfall in December: 70mm
The wettest month (with the highest rainfall) is November (87mm).
The driest month (with the least rainfall) is July (26mm).
Average rainfall days in December
Saint Johns, Guernsey
- Average rainfall days in December: 21.4 days
The month with the highest number of rainy days is November (22.8 days).
The month with the least rainy days is June (11.5 days).
Average snowfall in December
Saint Johns, Guernsey
- Average snowfall in December: 0mm
The month with the highest snowfall is January (2mm).
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in December
Saint Johns, Guernsey
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in December /
Average sunshine in December
Saint Johns, Guernsey
- Average daylight in December: 8h and 12min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 12min).
- Average sunshine in December: 3h and 54min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January, November and December (Average sunshine: 3h and 54min).
Average sunshine days in December
Saint Johns, Guernsey
- Average sunshine days in December: 5.3 days
The month with the most sunshine days is May (16.3 days).
The month with the least sunshine days is November (4 days).
Average UV index in December
Saint Johns, Guernsey
- Average UV index in December: 3
The months with the highest UV index are July, August and September (UV index 5).
The month with the lowest UV index is February (UV index 2).
Average cloud cover in December
Saint Johns, Guernsey
- Average cloud cover in December: 63
The months with the most cloud cover are November and December (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in December
Saint Johns, Guernsey
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
