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 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
With the transition into January, Thornton notes an average high-temperature of a mild 56.7°F (13.7°C), closely resembling December. The nighttime temperature in Thornton dips to a wintry 41.2°F (5.1°C) on average during January.Humidity
In January, the average relative humidity is 74%.Rainfall
In Thornton, in January, during 8.5 rainfall days, 2.01" (51mm) of precipitation is typically accumulated. Throughout the year, there are 63.8 rainfall days, and 12.6" (320mm) of precipitation is accumulated.Snowfall
January through November are months without snowfall in Thornton.Daylight
In January, the average length of the day is 9h and 52min.On the first day of the month, sunrise is at 7:22 am and sunset at 4:56 pm. On the last day of January, sunrise is at 7:11 am and sunset at 5:26 pm PST.
Sunshine
The average sunshine in January is 6.1h.UV index
The months with the lowest UV index in Thornton are January, February, November and December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In January, the maximum UV index of 3 transforms into these recommendations:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Frequently asked questions
What is the average January temperature in Thornton?
What is the average humidity in January in Thornton?
How many days does it rain in January in Thornton?
When it does not snow in Thornton?
Does it snow in Thornton in January?
How many hours of daylight does Thornton have in January?
When are sunrise and sunset in January in Thornton?
How many hours of sunshine does Thornton have in January?
What are the months with the lowest UV index in Thornton?
How high is the UV index in January in Thornton?
Average temperature in January
Thornton, CA
- Average high temperature in January: 56.7°F
The warmest month (with the highest average high temperature) is July (93.9°F).
The month with the lowest average high temperature is December (55°F).
- Average low temperature in January: 41.2°F
The month with the highest average low temperature is August (58.8°F).
The coldest month (with the lowest average low temperature) is December (41°F).
Average pressure in January
Thornton, CA
- Average pressure in January: 30.15"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in January
Thornton, CA
- Average wind speed in January: 4.8mph
The windiest months (with the highest average wind speed) are February and June (5.8mph).
The calmest month (with the lowest average wind speed) is November (4.4mph).
Average humidity in January
Thornton, CA
- Average humidity in January: 74%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (45%).
Average rainfall in January
Thornton, CA
- Average rainfall in January: 2.01"
The wettest month (with the highest rainfall) is February (2.4").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in January
Thornton, CA
- Average rainfall days in January: 8.5 days
The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is June (0.9 days).
Average snowfall days in January
Thornton, CA
- Average snowfall days in January: 0 days
The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in January /
Average sunshine in January
Thornton, CA
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January: 6h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in January
Thornton, CA
- Average sunshine days in January: 21.8 days
The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is March (17.8 days).
Average UV index in January
Thornton, CA
- Average UV index in January: 3
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in January
Thornton, CA
- Average cloud cover in January: 32
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in January
Thornton, 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).
Thornton, California, USA
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