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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, is another subzero cold winter month in Jefferson, Colorado, with temperature in the range of an average low of 0.7°F (-17.4°C) and an average high of 22.5°F (-5.3°C). The start of January marks an average high-temperature of a still subzero cold 22.5°F (-5.3°C), hardly distinguishable from the conditions in December. Weather in January »
Weather in February
The last month of the winter, February, is also a subzero cold month in Jefferson, Colorado, with temperature in the range of an average high of 22.5°F (-5.3°C) and an average low of 1.8°F (-16.8°C). February's onset brings an average high-temperature of a still subzero cold 22.5°F (-5.3°C), nearly the same as January. Weather in February »
Weather in March
March, the first month of the spring in Jefferson, is still a freezing cold month, with an average temperature ranging between max 28.8°F (-1.8°C) and min 8.1°F (-13.3°C). Jefferson's transition into March brings a slight rise in the average high-temperature, moving from a subzero cold 22.5°F (-5.3°C) in February to a still freezing cold 28.8°F (-1.8°C). Weather in March »
Weather in April
April in Jefferson, Colorado, is an icy spring month, with an average temperature fluctuating between 13.5°F (-10.3°C) and 33.6°F (0.9°C). As Jefferson steps into April, the average high-temperature holds at a cold 33.6°F (0.9°C), hinting at a minor fluctuation from the prior month. Weather in April »
Weather in May
May, the last month of the spring in Jefferson, is a chilly month, with an average temperature varying between 23.4°F (-4.8°C) and 45.5°F (7.5°C). May's arrival coincides with a temperature rise, moving from April's wintry 33.6°F (0.9°C) to a chilly 45.5°F (7.5°C). Weather in May »
Weather in June
The first month of the summer, June, is an enjoyable month in Jefferson, Colorado, with temperature in the range of an average high of 61.3°F (16.3°C) and an average low of 35.1°F (1.7°C). As June sets, the average high-temperature displays a significant increase, moving up from a chilly 45.5°F (7.5°C) in May to an enjoyable 61.3°F (16.3°C). Weather in June »
Weather in July
July, like June, in Jefferson, Colorado, is another comfortable summer month, with temperature in the range of an average low of 40.1°F (4.5°C) and an average high of 65.8°F (18.8°C). In Jefferson, July records the highest average temperatures, peaking at 65.8°F (18.8°C) and reaching a low of 40.1°F (4.5°C). Weather in July »
Weather in August
The last month of the summer, August, is also an enjoyable month in Jefferson, Colorado, with an average temperature ranging between max 63.7°F (17.6°C) and min 37.9°F (3.3°C). August ushers in an average high-temperature of a still enjoyable 63.7°F (17.6°C), aligning closely with the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Jefferson, is still a mild month, with an average temperature ranging between max 57.6°F (14.2°C) and min 33.4°F (0.8°C). September brings a slight decrease in the average high-temperature, shifting from an enjoyable 63.7°F (17.6°C) in August to a mild 57.6°F (14.2°C). Weather in September »
Weather in October
October, the same as September, in Jefferson, Colorado, is another chilly autumn month, with temperature in the range of an average low of 22.3°F (-5.4°C) and an average high of 43.3°F (6.3°C). October brings a drop in Jefferson's average high-temperature, falling from a refreshing 57.6°F (14.2°C) in September to a frosty 43.3°F (6.3°C). Weather in October »
Weather in November
November, the last month of the autumn in Jefferson, is another freezing cold month, with an average temperature ranging between max 31.1°F (-0.5°C) and min 10.9°F (-11.7°C). The onset of November is marked by a decrease in temperature, transitioning from a frosty 43.3°F (6.3°C) in October to a subzero cold 31.1°F (-0.5°C). Weather in November »
Weather in December
The first month of the winter, December, is also a subzero cold month in Jefferson, Colorado, with an average temperature varying between 0.7°F (-17.4°C) and 21.2°F (-6°C). With average temperatures fluctuating between a high of 21.2°F (-6°C) and a low of 0.7°F (-17.4°C), December stands out as the coldest month. Weather in December »
[Resources]Frequently asked questions
How much does it rain in Jefferson?
In Jefferson, Colorado, during the entire year, the rain falls for 110.4 days and collects up to 24.09" (612mm) of precipitation.
When does it snow in Jefferson?
Months with snowfall are January through December.
How many days does it snow in Jefferson?
Throughout the year, there are 158 snowfall days, and 118.82" (3018mm) of snow is accumulated.
What is the most humid month in Jefferson?
The most humid month in Jefferson, Colorado, is February, with an average relative humidity of 89%.
What is the month with the least sunshine in Jefferson?
The month with the least sunshine is February, with an average of 5.2h of sunshine.
When is the lowest UV index in Jefferson?
The months with the lowest UV index are February and December, with an average maximum UV index of 1.
When is Daylight Saving Time (DST) in Jefferson?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Jefferson, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.
When does it snow the most in Jefferson?
The month with the most snowfall is May, when snow falls for 19 days and typically aggregates up to 19.69" (500mm) of snow.
When is the highest UV index in Jefferson?
The months with the highest UV index in Jefferson, Colorado, are May through August, with an average maximum UV index of 3.
What is the least humid month in Jefferson?
The least humid month in Jefferson is June, with an average relative humidity of 54%.
When are the longest days in Jefferson?
With an average of 14h and 54min of daylight, June has the longest days of the year in Jefferson, Colorado.
What month has the most sunshine in Jefferson?
With an average of 11.4h of sunshine, June has the most sunshine of the year.
What is the hottest time of year in Jefferson?
Temperature readings reach their annual highs in July, averaging 65.8°F (18.8°C) and a minimum average of 40.1°F (4.5°C).
What is the wettest month in Jefferson?
July is the month with the most rainfall in Jefferson, Colorado. Rain falls for 22.8 days and accumulates 3.35" (85mm) of precipitation.
When it does not snow in Jefferson?
The month with the least snowfall in Jefferson, Colorado, is July, when snow falls for 1.3 days and typically aggregates up to 0.24" (6mm) of snow.
What is the driest month in Jefferson?
November is the month with the least rainfall. Rain falls for 2.8 days and accumulates 1.14" (29mm) of precipitation.
What is the coldest month in Jefferson?
Jefferson's coldest month, December, generally records average temperatures ranging from a high of 21.2°F (-6°C) to a low of 0.7°F (-17.4°C).
What is the month with the shortest days in Jefferson?
The month with the shortest days in Jefferson, Colorado, is December, with an average of 9h and 24min of daylight.
Average temperature
Jefferson, CO
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).
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
Jefferson, CO
- Average pressure in January:
30.19"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.96"Hg
- Average pressure in July:
30.06"Hg - Average pressure in August:
30.06"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.06"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.16"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
Jefferson, CO
- Average wind speed in January:
6.6mph - Average wind speed in February:
7mph - Average wind speed in March:
6.5mph - Average wind speed in April:
6.3mph - Average wind speed in May:
6.1mph - Average wind speed in June:
6.5mph
- Average wind speed in July:
4.9mph - Average wind speed in August:
4.8mph - Average wind speed in September:
5.2mph - Average wind speed in October:
6.3mph - Average wind speed in November:
6.3mph - Average wind speed in December:
6.2mph
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
Jefferson, CO
The month with the highest relative humidity is February (89%).
The month with the lowest relative humidity is June (54%).
Average rainfall
Jefferson, CO
- Average rainfall in January:
1.26" - Average rainfall in February:
1.77" - Average rainfall in March:
2.28" - Average rainfall in April:
2.48" - Average rainfall in May:
3.23" - Average rainfall in June:
2.17"
- Average rainfall in July:
3.35" - Average rainfall in August:
2.2" - Average rainfall in September:
1.46" - Average rainfall in October:
1.42" - Average rainfall in November:
1.14" - Average rainfall in December:
1.34"
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
Jefferson, CO
- Average rainfall days in January:
3.1 days - Average rainfall days in February:
3.8 days - Average rainfall days in March:
6.3 days - Average rainfall days in April:
6.7 days - Average rainfall days in May:
12.3 days - Average rainfall days in June:
13.3 days
- Average rainfall days in July:
22.8 days - Average rainfall days in August:
17.8 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
5.5 days - Average rainfall days in November:
2.8 days - Average rainfall days in December:
4.5 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
Jefferson, CO
- Average snowfall in January:
10.04" - Average snowfall in February:
14.29" - Average snowfall in March:
18.43" - Average snowfall in April:
19.41" - Average snowfall in May:
19.69" - Average snowfall in June:
4.06"
- Average snowfall in July:
0.24" - Average snowfall in August:
0.47" - Average snowfall in September:
2.05" - Average snowfall in October:
10.12" - Average snowfall in November:
9.21" - Average snowfall in December:
10.83"
The month with the highest snowfall is May (19.69").
The month with the least snowfall is July (0.24").
Average snowfall days
Jefferson, CO
- Average snowfall days in January:
17.1 days - Average snowfall days in February:
20.2 days - Average snowfall days in March:
21.5 days - Average snowfall days in April:
22.8 days - Average snowfall days in May:
19 days - Average snowfall days in June:
6.5 days
- Average snowfall days in July:
1.3 days - Average snowfall days in August:
2.2 days - Average snowfall days in September:
5.5 days - Average snowfall days in October:
12.3 days - Average snowfall days in November:
12 days - Average snowfall days in December:
17.6 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 / Average sunshine
Jefferson, CO
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 2min
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 - Average sunshine in February:
5h and 1min - Average sunshine in March:
7h and 1min - Average sunshine in April:
8h and 2min - Average sunshine in May:
9h and 5min - Average sunshine in June:
11h and 2min
- Average sunshine in July:
10h and 5min - Average sunshine in August:
11h and 0min - Average sunshine in September:
10h and 3min - Average sunshine in October:
6h and 5min - Average sunshine in November:
6h and 3min - Average sunshine in December:
5h and 3min
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
Jefferson, CO
- Average sunshine days in January:
14.6 days - Average sunshine days in February:
8 days - Average sunshine days in March:
8.3 days - Average sunshine days in April:
6 days - Average sunshine days in May:
7.5 days - Average sunshine days in June:
10.9 days
- Average sunshine days in July:
5.8 days - Average sunshine days in August:
9 days - Average sunshine days in September:
14.1 days - Average sunshine days in October:
17.2 days - Average sunshine days in November:
18.5 days - Average sunshine days in December:
13.2 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
Jefferson, CO
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
Jefferson, CO
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
Jefferson, CO
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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