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 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
Swansea's weather, upon January's arrival, documents an average high-temperature of a still frosty 48.4°F (9.1°C), nearly identical to the prior month. Throughout the month of January, Swansea reports a steady low-temperature average of 33.1°F (0.6°C).Humidity
The average relative humidity in January is 46%.Rainfall
In Swansea, during January, the rain falls for 5.1 days and regularly aggregates up to 0.63" (16mm) of precipitation. In Swansea, during the entire year, the rain falls for 48 days and collects up to 4.92" (125mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In January, it is snowing for 1 days. Throughout January, 0.55" (14mm) of snow is accumulated. In Swansea, during the entire year, snow falls for 4.5 days and aggregates up to 3.07" (78mm) of snow.Daylight
The average length of the day in January is 10h and 0min.On the first day of January, sunrise is at 7:03 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 5:16 pm PST.
Sunshine
January, February and December, with an average of 7.3h of sunshine, are months with the least sunshine.UV index
In Swansea, the average daily maximum UV index in January is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 3 during January translates into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Swansea in January?
What is the average humidity in January?
How much does it rain in January?
How many days does it snow in January?
What is the average length of the day in January?
What time are sunrise and sunset in January?
What is the month with the least sunshine in Swansea?
How long on average sun shines in January?
What is the UV index reading in January in Swansea?
Average temperature in January
Swansea, CA
- Average high temperature in January: 48.4°F
The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is December (46.9°F).
- Average low temperature in January: 33.1°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is December (31.5°F).
Average pressure in January
Swansea, CA
- Average pressure in January: 30.14"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in January
Swansea, CA
- Average wind speed in January: 5.9mph
The windiest months (with the highest average wind speed) are April, May and June (7.6mph).
The calmest month (with the lowest average wind speed) is November (5.8mph).
Average humidity in January
Swansea, CA
- Average humidity in January: 46%
The month with the highest relative humidity is December (47%).
The month with the lowest relative humidity is August (19%).
Average rainfall in January
Swansea, CA
- Average rainfall in January: 0.63"
The wettest month (with the highest rainfall) is December (0.67").
The driest months (with the least rainfall) are June and September (0.16").
Average rainfall days in January
Swansea, CA
- Average rainfall days in January: 5.1 days
The month with the highest number of rainy days is March (5.7 days).
The month with the least rainy days is September (2.3 days).
Average snowfall in January
Swansea, CA
- Average snowfall in January: 0.55"
The month with the highest snowfall is December (1.18").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Swansea, CA
- Average snowfall days in January: 1 days
The month with the highest number of snowfall days is December (1.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Swansea, CA
- Average daylight in January: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in January: 7h and 2min
The month with the most sunshine is June (Average sunshine: 12h and 12min).
The months with the least sunshine are January, February and December (Average sunshine: 7h and 18min).
Average sunshine days in January
Swansea, CA
- Average sunshine days in January: 23.5 days
The month with the most sunshine days is October (27.7 days).
The month with the least sunshine days is July (20 days).
Average UV index in January
Swansea, CA
- Average UV index in January: 3
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are November and December (UV index 2).
Average cloud cover in January
Swansea, CA
- Average cloud cover in January: 16
The month with the most cloud cover is January (Cloud cover 16).
The months with the least cloud cover are August and September (Cloud cover 5).
Average visibility in January
Swansea, CA
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Swansea, California, USA
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