Climateby Month

Aspen, CO climate by month

NOAA 1991-2020 normals · 7,890 ft elevation

Aspen has mild summers and cold and snowy winters. Highs peak at 76°F in July and fall to 32°F in December. Wet days are spread through the year, from about 7 to 13 a month. Normal snowfall is about 171 in a year. By our comfort score the best month is June.

Warmest month
76°F
July normal high
Coldest month
10°F
January normal low
Wet days a year
133
24.4 in of precipitation
Snow a year
170.8 in
normal snowfall

How warm is Aspen?

Normal highs range from 32°F in December to 76°F in July.

0°20°40°60°80° January: normal high 32°F (0°C), low 10°F (-12°C) 32° 10° February: normal high 35°F (2°C), low 13°F (-11°C) March: normal high 43°F (6°C), low 20°F (-7°C) April: normal high 50°F (10°C), low 27°F (-3°C) May: normal high 60°F (16°C), low 35°F (2°C) June: normal high 71°F (22°C), low 42°F (6°C) July: normal high 76°F (24°C), low 48°F (9°C) 76° 48° August: normal high 73°F (23°C), low 47°F (8°C) September: normal high 67°F (19°C), low 40°F (4°C) October: normal high 55°F (13°C), low 30°F (-1°C) November: normal high 42°F (6°C), low 19°F (-7°C) December: normal high 32°F (0°C), low 10°F (-12°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is Aspen?

April has the most wet days (about 13); the year brings about 24 in of precipitation.

January: 13 wet days February: 13 wet days March: 11 wet days April: 13 wet days 13 May: 11 wet days June: 7 wet days 7 July: 11 wet days August: 13 wet days September: 10 wet days October: 9 wet days November: 10 wet days December: 12 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How much does it snow?

Normal snowfall is 170.8 in a year, most of it in February.

January: 28.1 in of snow February: 28.3 in of snow 28.3 March: 26.9 in of snow April: 20.9 in of snow May: 7.0 in of snow June: 0.4 in of snow July: 0.0 in of snow 0.0 August: 0.0 in of snow September: 1.0 in of snow October: 10.2 in of snow November: 20.5 in of snow December: 27.5 in of snow JFMAMJJASOND

How humid is Aspen?

Muggy days (dew point 65°F or higher) are rare in any month.

January: 0 muggy days 0 February: 0 muggy days March: 0 muggy days April: 0 muggy days May: 0 muggy days June: 0 muggy days July: 0 muggy days August: 0 muggy days September: 0 muggy days October: 0 muggy days November: 0 muggy days December: 0 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at Eagle Co Regional Airport, 32 mi N of the city center (the nearest airport with complete hourly records).

How much daylight?

Daylight ranges from about 9.5 hours in December to 14.9 hours in June.

January: 9.8 hours of daylight February: 10.7 hours of daylight March: 12.0 hours of daylight April: 13.3 hours of daylight May: 14.3 hours of daylight June: 14.9 hours of daylight 14.9 July: 14.6 hours of daylight August: 13.7 hours of daylight September: 12.4 hours of daylight October: 11.2 hours of daylight November: 10.0 hours of daylight December: 9.5 hours of daylight 9.5 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for Aspen, 1991-2020
MonthHighLowPrecip.Wet daysSnowMuggy daysDaylight
January 32°F10°F 1.9 in13 28.1 in 0 9.8 h
February 35°F13°F 2.2 in13 28.3 in 0 10.7 h
March 43°F20°F 2.6 in11 26.9 in 0 12.0 h
April 50°F27°F 2.7 in13 20.9 in 0 13.3 h
May 60°F35°F 2.2 in11 7.0 in 0 14.3 h
June 71°F42°F 1.1 in7 0.4 in 0 14.9 h
July 76°F48°F 2.0 in11 0.0 in 0 14.6 h
August 73°F47°F 1.8 in13 0.0 in 0 13.7 h
September 67°F40°F 1.9 in10 1.0 in 0 12.4 h
October 55°F30°F 2.1 in9 10.2 in 0 11.2 h
November 42°F19°F 2.1 in10 20.5 in 0 10.0 h
December 32°F10°F 2.0 in12 27.5 in 0 9.5 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit Aspen

By our comfort score, the best month is June.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 260724
Feb 310717
Mar 41079
Apr 50384
May 711471
Jun 892430
Jul 812160
Aug 842560
Sep 782260
Oct 56963
Nov 361712
Dec 250724

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in Aspen

The last spring frost typically comes around May 31, and the first fall frost around Sep 23, leaving 114 frost-free days in a typical year.

Frost and freeze dates for Aspen
Typical date1 year in 10
Last spring frost (32°F)May 31after Jun 14
First fall frost (32°F)Sep 23before Sep 11
Last hard freeze (28°F)May 13after Jun 1
First hard freeze (28°F)Oct 2before Sep 21
Frost-free season114 daysunder 94 days

"Typical" is the date with a 50% chance of a later spring frost (or earlier fall frost). Planting after the "1 year in 10" spring date gives a 90% chance of no further frost. The Old Farmer's Almanac publishes 30% dates, which fall between our typical and 1-in-10 dates.

Station: Aspen Pitkin Co Airport (USW00093073), NOAA 1991-2020 freeze probabilities. Frost dates for every city in Colorado.

Hottest and coldest readings, 1991-2020

The highest reading was 89°F (July 22, 2005, and 5 other days); the lowest was -23°F (December 18, 1996).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near Aspen

Similar climates elsewhere

Where the numbers come from

  • Temperature, rain, snowfall and snow depth: Aspen 1SW (USC00050372), 1.2 mi WSW of the city center, 8,175 ft (285 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Frost dates: Aspen Pitkin Co Airport (USW00093073), 3.5 mi NW of the city center, 7,720 ft (170 ft lower than the city). NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: Eagle Co Regional Airport (724675-23063), 32 mi N of the city center, 6,497 ft (1,393 ft lower than the city). Hourly observations, 1991-2020.
  • Not available for this location: humidity and wind by hour and cloud cover (no station close enough or similar enough in elevation).

Distances from the city center (USGS). Methodology · Report an error