Holly, CO climate
Holly has chilly winters and hot summers, with very little rain. A typical July afternoon reaches 94°, a January night drops to 17°, and about 22 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Holly feels like
Winter
Spring
Summer
Fall
Holly 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 | 46° | 17° | 0.3" | 4.2" | 2 | 5 | 18° – 39° |
| February | 50° | 21° | 0.3" | 3.4" | 3 | 5 | 25° – 42° |
| March | 61° | 29° | 0.8" | 4.7" | 4 | 2 | 39° – 52° |
| April | 69° | 37° | 1.4" | 1.4" | 6 | 0 | 46° – 57° |
| May | 78° | 48° | 2.1" | 0.7" | 8 | 0 | 57° – 69° |
| June | 89° | 58° | 2.4" | 0 | 8 | 0 | 69° – 79° |
| July | 94° | 64° | 3.0" | 0 | 8 | 0 | 74° – 84° |
| August | 91° | 62° | 2.8" | 0 | 7 | 0 | 71° – 81° |
| September | 84° | 53° | 1.1" | 0 | 5 | 0 | 62° – 74° |
| October | 71° | 39° | 1.3" | 1.0" | 4 | 1 | 47° – 60° |
| November | 57° | 26° | 0.5" | 3.2" | 3 | 1 | 34° – 48° |
| December | 47° | 18° | 0.5" | 2.9" | 3 | 5 | 24° – 37° |
| Year | 70° | 39° | 16.4" | 21.5" | 60 | 18 |
“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 Holly
Holly gets 16 inches of rain and melted snow a year. July is the wettest month and January the driest. Rain or snow falls on about 60 days a year. Snow covers the ground about 18 days of the year.
About 163 frost-free days a year
In half of years the last 32° night comes by May 1 and the first one by October 12. That leaves about 163 frost-free days for gardens, shorter than 68% of U.S. towns.
Heating and cooling a home in Holly
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Holly, 82% of that work is heating and 18% 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 Holly 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 Holly averaged 1.1° warmer than the 1900s. The biggest change is in March (+2.9°). The shift is smaller than in 58% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Holly’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 18° to 39°. August is the most reliable, staying within 10°.
Common questions about Holly’s climate
What is the coldest month in Holly?
January, with a typical high of 46° and a low of 17°.
What is the hottest month in Holly?
July, with a typical high of 94° and a low of 64°. About 73 days a year reach 90°.
How much snow does Holly get?
About 22 inches in a normal winter, most of it in March.
When is the first frost in Holly?
In half of years the first 32° night comes by October 12, and the last spring frost by May 1.
What is the rainiest month in Holly?
July, with 3.0 inches of rain and melted snow. The year totals 16 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Holly itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Holly, CO (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.