Climate and monthly weather forecastJefferson, CO
Climate and monthly weather forecast
Weather in January
January, like December, is another subzero cold winter month in Jefferson, Colorado, with an average temperature varying between 22.5°F (-5.3°C) and 0.7°F (-17.4°C). 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). Weather in January »Weather in February
February, the last month of the winter in Jefferson, is also a subzero cold month, 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). As January turns into February, the average high-temperatures rest at a still freezing cold 22.5°F (-5.3°C), without variation from the prior month. Weather in February »Weather in March
The first month of the spring, March, is also a subzero cold month in Jefferson, Colorado, with temperature in the range of an average high of 28.8°F (-1.8°C) and an average low of 8.1°F (-13.3°C). The start of March is characterized by a subtle increase in the average high-temperature, transitioning from a freezing cold 22.5°F (-5.3°C) in February to a still subzero cold 28.8°F (-1.8°C). Weather in March »Weather in April
April in Jefferson, Colorado, is a cold spring month, with an average temperature ranging between max 33.6°F (0.9°C) and min 13.5°F (-10.3°C). The transition into April shows a subtle variation to a cold 33.6°F (0.9°C) from March's 28.8°F (-1.8°C) in the average high-temperature. Weather in April »Weather in May
The last month of the spring, May, is a frosty month in Jefferson, Colorado, with an average temperature ranging between min 23.4°F (-4.8°C) and max 45.5°F (7.5°C). Jefferson, Colorado, sees a rise in temperature during May, with average high-temperatures transitioning from a cold 33.6°F (0.9°C) in April to a chilly 45.5°F (7.5°C). Weather in May »Weather in June
The first month of the summer, June, is a comfortable month in Jefferson, Colorado, with an average temperature ranging between max 61.3°F (16.3°C) and min 35.1°F (1.7°C). Jefferson's June weather is characterized by a distinct upsurge in high-temperatures, soaring from May's chilly 45.5°F (7.5°C) to a refreshing 61.3°F (16.3°C). Weather in June »Weather in July
July, the same as June, is another enjoyable summer month in Jefferson, Colorado, 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). July, with average temperatures reaching a high of 65.8°F (18.8°C) and a low of 40.1°F (4.5°C), is the warmest month. Weather in July »Weather in August
The last month of the summer, August, is another refreshing month in Jefferson, Colorado, with an average temperature fluctuating between 63.7°F (17.6°C) and 37.9°F (3.3°C). Transitioning into August, Jefferson experiences an average high-temperature of a still comfortable 63.7°F (17.6°C), marking a minor shift from the preceding month. Weather in August »Weather in September
The first month of the autumn, September, is still a mild month in Jefferson, Colorado, with an average temperature varying between 57.6°F (14.2°C) and 33.4°F (0.8°C). The arrival of September corresponds with a minor reduction in the average high-temperature, down from August's refreshing 63.7°F (17.6°C) to a moderate 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 an average temperature ranging between max 43.3°F (6.3°C) and min 22.3°F (-5.4°C). As September transitions into October, Jefferson sees a drop in the average high-temperature, transitioning from a moderate 57.6°F (14.2°C) 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 fluctuating between 31.1°F (-0.5°C) and 10.9°F (-11.7°C). The shift from October to November involves a decrease in the average high-temperature, from a chilly 43.3°F (6.3°C) 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 temperature in the range of an average low of 0.7°F (-17.4°C) and an average high of 21.2°F (-6°C). The coldest period tends to be December, when average temperatures fluctuate between a high of 21.2°F (-6°C) and a low of 0.7°F (-17.4°C). Weather in December »Updated: Jul 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In Jefferson, during the entire year, the rain falls for 110.4 days and collects up to 24.09" (612mm) of precipitation.
January through December are months with snowfall.
In Jefferson, during the entire year, snow falls for 158 days and aggregates up to 118.82" (3018mm) of snow.
The most humid month is February, with an average relative humidity of 89%.
February has the least sunshine of the year, with an average of 5.2h of sunshine.
The months with the lowest UV index are February and December, with an average maximum UV index of 1.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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.
May is the month with the most snowfall. Snow falls for 19 days and accumulates 19.69" (500mm) of snow.
May through August, with an average maximum UV index of 3, are months with the highest UV index.
The least humid month is June, with an average relative humidity of 54%.
With an average of 14h and 54min of daylight, June has the longest days of the year.
The month with the most sunshine is June, with an average of 11.4h of sunshine.
The warmest month is July, with an average high-temperature of 65.8°F (18.8°C) and an average low-temperature of 40.1°F (4.5°C).
The month with the most rainfall is July, when the rain falls for 22.8 days and typically aggregates up to 3.35" (85mm) of precipitation.
July is the month with the least snowfall. Snow falls for 1.3 days and accumulates 0.24" (6mm) of snow.
November is the month with the least rainfall in Jefferson. Rain falls for 2.8 days and accumulates 1.14" (29mm) of precipitation.
Jefferson's coldest weather arrives in December, when temperatures average a high of 21.2°F (-6°C) and a low of 0.7°F (-17.4°C).
December has the shortest days of the year, 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 48min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 24min - Average daylight in June:
14h and 54min
- Average daylight in July:
14h and 36min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
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 18min - Average sunshine in February:
5h and 12min - Average sunshine in March:
7h and 12min - Average sunshine in April:
8h and 18min - Average sunshine in May:
9h and 54min - Average sunshine in June:
11h and 24min
- Average sunshine in July:
10h and 54min - Average sunshine in August:
11h and 0min - Average sunshine in September:
10h and 30min - Average sunshine in October:
6h and 48min - Average sunshine in November:
6h and 30min - Average sunshine in December:
5h and 30min
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).
