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 dawn of January sees an average high-temperature of a still freezing cold 22.5°F (-5.3°C), subtly contrasting with December's 21.2°F (-6°C). During January, Jefferson notes a substantial drop from the daytime peak to an average minimum temperature of 0.7°F (-17.4°C).Humidity
In Jefferson, the average relative humidity in January is 87%.Rainfall
In Jefferson, during January, the rain falls for 3.1 days and regularly aggregates up to 1.26" (32mm) of precipitation. In Jefferson, during the entire year, the rain falls for 110.4 days and collects up to 24.09" (612mm) of precipitation.Snowfall
Months with snowfall are January through December. In Jefferson, Colorado, during January, snow falls for 17.1 days and regularly aggregates up to 10.04" (255mm) of snow. Throughout the year, there are 158 snowfall days, and 118.82" (3018mm) of snow is accumulated.Daylight
The average length of the day in January is 9h and 46min.On the first day of January, sunrise is at 7:23 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 5:21 pm MST.
Sunshine
The average sunshine in January is 5.3h.UV index
The average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index of 2 during January leads to these instructions:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Around midday, solar radiation is most harmful; hence, exposure should be limited. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is January?
What is the average humidity in January?
How much does it rain in January?
How much does it snow in January?
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 is the UV index reading in January?
Average temperature in January
Jefferson, CO
- Average high temperature in January: 22.5°F
The warmest month (with the highest average high temperature) is July (65.8°F).
The month with the lowest average high temperature is December (21.2°F).
- Average low temperature in January: 0.7°F
The month with the highest average low temperature is July (40.1°F).
The coldest months (with the lowest average low temperature) are January and December (0.7°F).
Average pressure in January
Jefferson, CO
- Average pressure in January: 30.19"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are April and May (29.94"Hg).
Average wind speed in January
Jefferson, CO
- Average wind speed in January: 6.6mph
The windiest month (with the highest average wind speed) is February (7mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in January
Jefferson, CO
- Average humidity in January: 87%
The month with the highest relative humidity is February (89%).
The month with the lowest relative humidity is June (54%).
Average rainfall in January
Jefferson, CO
- Average rainfall in January: 1.26"
The wettest month (with the highest rainfall) is July (3.35").
The driest month (with the least rainfall) is November (1.14").
Average rainfall days in January
Jefferson, CO
- Average rainfall days in January: 3.1 days
The month with the highest number of rainy days is July (22.8 days).
The month with the least rainy days is November (2.8 days).
Average snowfall in January
Jefferson, CO
- Average snowfall in January: 10.04"
The month with the highest snowfall is May (19.69").
The month with the least snowfall is July (0.24").
Average snowfall days in January
Jefferson, CO
- Average snowfall days in January: 17.1 days
The month with the highest number of snowfall days is April (22.8 days).
The month with the least snowfall days is July (1.3 days).
Average daylight in January /
Average sunshine in January
Jefferson, CO
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January: 5h and 2min
The month with the most sunshine is June (Average sunshine: 11h and 24min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in January
Jefferson, CO
- Average sunshine days in January: 14.6 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is July (5.8 days).
Average UV index in January
Jefferson, CO
- Average UV index in January: 2
The months with the highest UV index are May, June, July and August (UV index 3).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in January
Jefferson, CO
- Average cloud cover in January: 49
The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is June (Cloud cover 19).
Average visibility in January
Jefferson, CO
- Average visibility in January: 4mi
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
Jefferson, Colorado, USA
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