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
The coldest period tends to be January, when average temperatures fluctuate between a high of 54°F (12.2°C) and a low of 37.9°F (3.3°C).Humidity
In January, the average relative humidity is 77%.Rainfall
In Jefferson, in January, during 10.3 rainfall days, 2.52" (64mm) of precipitation is typically accumulated. Throughout the year, there are 155.6 rainfall days, and 35.79" (909mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through March. January is the first month it typically snows. Throughout January, in the average 0.8 snowfall days, it receives 0.59" (15mm) of snow. Throughout the year, there are 2.6 snowfall days, and 1.34" (34mm) of snow is accumulated.Daylight
In January, the average length of the day in Jefferson is 10h and 17min.On the first day of the month, sunrise is at 7:19 am and sunset at 5:22 pm. On the last day of January, sunrise is at 7:12 am and sunset at 5:48 pm CST.
Sunshine
The average sunshine in January is 5.3h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 3 during January translates into these guidelines:
Take necessary precautions - Protection from skin and eye injury is mandatory. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
What is the temperature in January?
What is the average humidity in January?
How much does it rain in January?
When does it start to snow?
What is the average length of the day in January?
When are sunrise and sunset in January?
How many hours of sunshine does Jefferson have in January?
What are the months with the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Jefferson, TX
- Average high temperature in January: 54°F
The warmest month (with the highest average high temperature) is July (94.8°F).
The month with the lowest average high temperature is January (54°F).
- Average low temperature in January: 37.9°F
The months with the highest average low temperature are July and August (73°F).
The coldest month (with the lowest average low temperature) is January (37.9°F).
Average pressure in January
Jefferson, TX
- Average pressure in January: 30.16"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in January
Jefferson, TX
- Average wind speed in January: 6.5mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in January
Jefferson, TX
- Average humidity in January: 77%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is August (67%).
Average rainfall in January
Jefferson, TX
- Average rainfall in January: 2.52"
The wettest month (with the highest rainfall) is April (4.41").
The driest month (with the least rainfall) is September (2.05").
Average rainfall days in January
Jefferson, TX
- Average rainfall days in January: 10.3 days
The month with the highest number of rainy days is August (14.8 days).
The month with the least rainy days is January (10.3 days).
Average snowfall in January
Jefferson, TX
- Average snowfall in January: 0.59"
The month with the highest snowfall is February (0.63").
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0").
Average snowfall days in January
Jefferson, TX
- Average snowfall days in January: 0.8 days
The month with the highest number of snowfall days is February (1.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Jefferson, TX
- Average daylight in January: 10h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in January: 5h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in January
Jefferson, TX
- Average sunshine days in January: 18.1 days
The month with the most sunshine days is October (18.9 days).
The month with the least sunshine days is February (12.8 days).
Average UV index in January
Jefferson, TX
- Average UV index in January: 3
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in January
Jefferson, TX
- Average cloud cover in January: 41
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in January
Jefferson, TX
- Average visibility in January: 6mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is February (5mi).
Jefferson, Texas, USA
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