Monthly weather forecast and climate
Jefferson, CO

Weather in January

January, like December, is another subzero cold winter 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 0.7°F (-17.4°C). In January, the average high-temperature is practically the same as in December - a still freezing cold 22.5°F (-5.3°C). Weather in January »

Weather in February

February, the last month of the winter, in Jefferson, is also a subzero cold month, with average temperature ranging between max 22.5°F (-5.3°C) and min 1.8°F (-16.8°C). In Jefferson, Colorado, the average high-temperature in February remains the same as in January - a still freezing cold 22.5°F (-5.3°C). Weather in February »

Weather in March

March, the first month of the spring, in Jefferson, is also a subzero cold month, with average temperature ranging between max 28.8°F (-1.8°C) and min 8.1°F (-13.3°C). In March, the average high-temperature slightly increases, from 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 average temperature ranging between min 13.5°F (-10.3°C) and max 33.6°F (0.9°C). In Jefferson, the average high-temperature is relatively the same as in March - a cold 33.6°F (0.9°C). Weather in April »

Weather in May

The last month of the spring, May, is a frosty month in Jefferson, Colorado, with temperature in the range of an average high of 45.5°F (7.5°C) and an average low of 23.4°F (-4.8°C). In May, the average high-temperature rises, from a wintry 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 an enjoyable month in Jefferson, Colorado, with average temperature fluctuating between 35.1°F (1.7°C) and 61.3°F (16.3°C). In June, the average high-temperature increases considerably, from a frosty 45.5°F (7.5°C) in May, to an enjoyable 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). With an average high-temperature of 65.8°F (18.8°C) and an average low-temperature of 40.1°F (4.5°C), July is the warmest month. Weather in July »

Weather in August

August, the last month of the summer, in Jefferson, is another comfortable month, with average temperature fluctuating between 37.9°F (3.3°C) and 63.7°F (17.6°C). In August, the average high-temperature is relatively the same as in July - a still comfortable 63.7°F (17.6°C). Weather in August »

Weather in September

September, the first month of the autumn, in Jefferson, is also a moderate month, with average temperature varying between 33.4°F (0.8°C) and 57.6°F (14.2°C). In September, the average high-temperature marginally drops, from an enjoyable 63.7°F (17.6°C) in August, to a moderate 57.6°F (14.2°C). Weather in September »

Weather in October

October, the same as September, in Jefferson, Colorado, is a frosty autumn month, with temperature in the range of an average high of 43.3°F (6.3°C) and an average low of 22.3°F (-5.4°C). In October, the average high-temperature drops, from a mild 57.6°F (14.2°C) in September, to a chilly 43.3°F (6.3°C). Weather in October »

Weather in November

November, the last month of the autumn, in Jefferson, is also a subzero cold month, with temperature in the range of an average low of 10.9°F (-11.7°C) and an average high of 31.1°F (-0.5°C). In Jefferson, Colorado, the average high-temperature drops, from a chilly 43.3°F (6.3°C) in October, to a freezing cold 31.1°F (-0.5°C). Weather in November »

Weather in December

December, the first month of the winter, in Jefferson, is still a freezing cold month, with average temperature ranging between min 0.7°F (-17.4°C) and max 21.2°F (-6°C). December is the coldest month, with an average high-temperature of 21.2°F (-6°C) and an average low-temperature of 0.7°F (-17.4°C). Weather in December »
[Resources]

FAQ

How many days does it rain in Jefferson?

Throughout the year, there are 110.4 rainfall days, and 24.09" (612mm) of precipitation is accumulated.

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?

With an average relative humidity of 89%, February is the most humid month in Jefferson.

What is the month with the least sunshine in Jefferson?

February has the least sunshine of the year, with an average of 5.2h of sunshine.

What is the month with the lowest UV index in Jefferson?

Months with the lowest UV index are February and December, with an average maximum UV index of 1.

When does it snow the most in Jefferson?

May is the month with the most snowfall in Jefferson, Colorado. Snow falls for 19 days and accumulates 19.69" (500mm) of snow.

When is the highest UV index in Jefferson?

Months with the highest UV index are May through August, with an average maximum UV index of 3.

What is the least humid month in Jefferson?

The least humid month is June, with an average relative humidity of 54%.

When are the longest days in Jefferson?

The month with the longest days in Jefferson, Colorado, is June, with an average of 14.9h of daylight.

What month has the most sunshine in Jefferson?

The month with the most sunshine in Jefferson is June, with an average of 11.4h of sunshine.

What is the warmest month in Jefferson?

With an average high-temperature of 65.8°F (18.8°C) and an average low-temperature of 40.1°F (4.5°C), July is the warmest month in Jefferson, Colorado.

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?

July is the month with the least snowfall in Jefferson. Snow falls for 1.3 days and accumulates 0.24" (6mm) of snow.

What is the driest month in Jefferson?

The month with the least rainfall is November when the rain falls for 2.8 days and typically collects 1.14" (29mm) of precipitation.

What is the coldest month in Jefferson?

With an average high-temperature of 21.2°F (-6°C) and an average low-temperature of 0.7°F (-17.4°C), December is the coldest month in Jefferson.

What is the month with the shortest days in Jefferson?

With an average of 9.4h of daylight, December has the shortest days of the year.

Average temperature
Jefferson, CO

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).

[Resources]

Average pressure
Jefferson, CO

Average pressure - Jefferson, CO

The month with the highest atmospheric pressure is January (30.19").
Months with the lowest atmospheric pressure are April and May (29.94").

[Resources]

Average wind speed
Jefferson, CO

Average wind speed - Jefferson, CO

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).

[Resources]

Average rainfall
Jefferson, CO

Average rainfall - Jefferson, CO

The wettest month (with the highest rainfall) is July (3.35").
The driest month (with the least rainfall) is November (1.14").

[Resources]

Average rainfall days
Jefferson, CO

Average rainfall days - Jefferson, CO

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).

[Resources]

Average snowfall
Jefferson, CO

Average snowfall - Jefferson, CO

The month with the highest snowfall is May (19.69").
The month with the least snowfall is July (0.24").

[Resources]

Average snowfall days
Jefferson, CO

Average snowfall days - Jefferson, CO

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).

[Resources]

Average daylight / Average sunshine
Jefferson, CO

Average daylight / Average sunshine - Jefferson, CO

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

The month with the most sunshine is June (Average sunshine: 11.4h).
The month with the least sunshine is February (Average sunshine: 5.2h).

[Resources]

Average sunshine days
Jefferson, CO

Average sunshine days - Jefferson, CO

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is July (5.8 days).

[Resources]

Average visibility
Jefferson, CO

Average visibility - Jefferson, CO

Months with the highest visibility are June, July, August, September and October (6mi).
Months with the lowest visibility are January, February, March, April and December (4mi).

[Resources]