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Boulder weather in January

Weather in Boulder: January


	Average day temperature:	30.0°F
	Average night temperature:	17.4°F

	Number of sunny days:	15 days
	Day length:	9.4 - 10.1 hours

	Number of days with precipitation:	1 day
	Precipitation totals:	0.4 in.

more information

14 days
forecast

Boulder

weather in
February

Boulder

January
February
March
April

May
June
July
August

September
October
November
December

Show year:

2025

2024

2023

-11

-1

Day temperature

Night temperature

The highest day temperature during January of 2025 was 51°F. At the same time the lowest night temperature was -1°F. Daily and nightly averages during January were 32.6°F and 18.2°F.

	Sunny days
	Partly cloudy days
	Cloudy days

48%

29%

23%

Mostly all days in January are sunny but cloudy days are also possible.

jan

feb

mar

apr

may

jun

jul

aug

sep

oct

nov

dec

0.0

0.4

0.8

1.3

1.7

2.1

2.5

2.9

3.4

1.6

2.2

2.5

2.4

1.6

1.5

1.6

2.2

2.5

2.4

1.6

1.5

Precipitation total value in Boulder in January is 0.4 in. Other months of the year show relatively similar values.

jan

feb

mar

apr

may

jun

jul

aug

sep

oct

nov

dec

0.0

1.5

3.0

4.5

6.0

7.5

9.0

10.5

8.7

8.2

7.2

6.6

6.3

6.4

7.0

6.7

8.0

7.7

8.4

8.7

8.2

7.2

6.6

6.3

6.4

7.0

6.7

8.0

7.7

8.4

8.3

The average wind speed value in January is 8.3 mph It makes January one of the most windy months of the year.

jan

feb

mar

apr

may

jun

jul

aug

sep

oct

nov

dec

0.0

1.7

3.3

5.0

6.6

8.3

9.9

11.6

6.5

7.1

8.5

9.5

9.0

9.5

9.6

8.1

7.9

7.1

6.5

7.1

8.5

9.5

9.0

9.5

9.6

8.1

7.9

7.1

6.2

This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in January is: 6.2.