Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average sea temperature in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
The arrival of January in Saint Helier sees a recorded average high-temperature of a frosty 9.3°C (48.7°F), showing little divergence from the previous month's conditions. In Saint Helier, January nights maintain a consistent temperature, with an average low of 7.3°C (45.1°F).Humidity
In January, the average relative humidity in Saint Helier is 79%.Rainfall
In Saint Helier, in January, during 20.3 rainfall days, 57mm (2.24") of precipitation is typically accumulated. In Saint Helier, during the entire year, the rain falls for 189 days and collects up to 538mm (21.18") of precipitation.Snowfall
Months with snowfall in Saint Helier are January through March, November and December. January is the month with the most snowfall in Saint Helier. Snow falls for 0.4 days and accumulates 2mm (0.08") of snow.Sea temperature
In Saint Helier, in January, the average water temperature is 10°C (50°F).Note: Dipping into 10°C (50°F) below 10°C (50°F) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 13°C (55.4°F) can be jarring.
Daylight
In January, the average length of the day is 8h and 46min.On the first day of January, sunrise is at 08:03 and sunset at 16:20. On the last day of the month, sunrise is at 07:41 and sunset at 17:02 GMT.
Sunshine
The months with the least sunshine in Saint Helier are January and November, with an average of 4h of sunshine.UV index
The months with the lowest UV index in Saint Helier are January and February, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In January, the maximum UV index of 2 suggests these recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Frequently asked questions
What is the temperature in January in Saint Helier?
What is the average humidity in January in Saint Helier?
How much does it rain in Saint Helier in January?
When does it snow the most in Saint Helier?
How many days does it snow in January in Saint Helier?
How cold is the water in January in Saint Helier?
How many hours of daylight does Saint Helier have in January?
When is the sunrise / sunset in January in Saint Helier?
What are the months with the least sunshine in Saint Helier?
How long on average sun shines in January in Saint Helier?
When is the lowest UV index in Saint Helier?
What is the UV index intensity in January in Saint Helier?
Average temperature in January
Saint Helier, Jersey
- Average high temperature in January: 9.3°C
The warmest month (with the highest average high temperature) is August (18.2°C).
The month with the lowest average high temperature is February (9°C).
- Average low temperature in January: 7.3°C
The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is February (6.8°C).
Average pressure in January
Saint Helier, Jersey
- Average pressure in January: 1016.5mbar
The month with the highest atmospheric pressure is September (1018mbar).
The month with the lowest atmospheric pressure is November (1011.8mbar).
Average wind speed in January
Saint Helier, Jersey
- Average wind speed in January: 32km/h
The windiest month (with the highest average wind speed) is December (34km/h).
The calmest month (with the lowest average wind speed) is July (20.4km/h).
Average humidity in January
Saint Helier, Jersey
- Average humidity in January: 79%
The months with the highest relative humidity are June and July (83%).
The months with the lowest relative humidity are November and December (78%).
Average rainfall in January
Saint Helier, Jersey
- Average rainfall in January: 57mm
The wettest month (with the highest rainfall) is November (78mm).
The driest month (with the least rainfall) is July (25mm).
Average rainfall days in January
Saint Helier, Jersey
- Average rainfall days in January: 20.3 days
The month with the highest number of rainy days is November (21.2 days).
The months with the least rainy days are May and July (12.2 days).
Average snowfall in January
Saint Helier, Jersey
- Average snowfall in January: 2mm
The month with the highest snowfall is January (2mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in January
Saint Helier, Jersey
- Average snowfall days in January: 0.4 days
The months with the highest number of snowfall days are January and February (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in January
Saint Helier, Jersey
- Average sea temperature in January: 10°C
The best month for swimming (with the highest average sea temperature) is August (17°C).
The coldest months (with the lowest average sea temperature) are February and March (9°C).
Average daylight in January /
Average sunshine in January
Saint Helier, Jersey
- Average daylight in January: 8h and 5min
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 18min).
- Average sunshine in January: 4h and 0min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January and November (Average sunshine: 4h and 0min).
Average sunshine days in January
Saint Helier, Jersey
- Average sunshine days in January: 7.5 days
The month with the most sunshine days is May (16.8 days).
The month with the least sunshine days is November (5.8 days).
Average UV index in January
Saint Helier, Jersey
- Average UV index in January: 2
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are January and February (UV index 2).
Average cloud cover in January
Saint Helier, Jersey
- Average cloud cover in January: 61
The months with the most cloud cover are January, November and December (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in January
Saint Helier, Jersey
- Average visibility in January: 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).
Saint Helier, Jersey
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