Nunn, CO climate
Nunn has cold, snowy winters and warm summers, with very little rain. A typical July afternoon reaches 89°, a January night drops to 15°, and about 48 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Nunn feels like
Winter
Spring
Summer
Fall
Nunn weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 43° | 15° | 0.2" | 6.6" | 4 | 13 | 19° – 35° |
| February | 45° | 17° | 0.3" | 7.0" | 5 | 8 | 26° – 38° |
| March | 55° | 25° | 0.7" | 8.2" | 6 | 4 | 33° – 47° |
| April | 61° | 31° | 1.5" | 5.7" | 9 | 2 | 40° – 52° |
| May | 70° | 41° | 2.2" | 1.8" | 11 | 0 | 49° – 60° |
| June | 82° | 50° | 1.8" | 0 | 8 | 0 | 61° – 72° |
| July | 89° | 57° | 1.9" | 0 | 8 | 0 | 68° – 76° |
| August | 86° | 54° | 1.6" | 0 | 8 | 0 | 66° – 73° |
| September | 78° | 46° | 1.2" | 0.6" | 7 | 0 | 57° – 66° |
| October | 64° | 33° | 1.1" | 4.0" | 6 | 1 | 41° – 54° |
| November | 51° | 23° | 0.5" | 7.6" | 5 | 4 | 29° – 43° |
| December | 42° | 15° | 0.3" | 6.9" | 4 | 11 | 21° – 34° |
| Year | 64° | 34° | 13.3" | 48.4" | 82 | 44 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Nunn
Nunn gets 13 inches of rain and melted snow a year. May is the wettest month and January the driest. Rain or snow falls on about 82 days a year. Snow covers the ground about 44 days of the year.
About 136 frost-free days a year
In half of years the last 32° night comes by May 13 and the first one by September 27. That leaves about 136 frost-free days for gardens, shorter than 92% of U.S. towns.
Heating and cooling a home in Nunn
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Nunn, 94% of that work is heating and 6% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Nunn compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Nunn averaged 2.1° warmer than the 1900s. The biggest change is in March (+4.2°). The shift is larger than in 95% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Nunn’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. January swings the most: between 1991 and 2020 its average temperature ranged from 19° to 35°. August is the most reliable, staying within 8°.
Common questions about Nunn’s climate
What is the coldest month in Nunn?
January, with a typical high of 43° and a low of 15°.
What is the hottest month in Nunn?
July, with a typical high of 89° and a low of 57°. About 34 days a year reach 90°.
How much snow does Nunn get?
About 48 inches in a normal winter, most of it in March.
When is the first frost in Nunn?
In half of years the first 32° night comes by September 27, and the last spring frost by May 13.
What is the rainiest month in Nunn?
May, with 2.2 inches of rain and melted snow. The year totals 13 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Nunn itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Ft Collins 4 E, CO (16 mi, snow) and Nunn 7 Nne, CO (7 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.