Grand Junction, IA climate
Grand Junction has cold, snowy winters and warm summers. A typical July afternoon reaches 84°, a January night drops to 11°, and about 32 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Grand Junction feels like
Winter
Spring
Summer
Fall
Grand Junction 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 | 29° | 11° | 0.9" | 8.2" | 7 | 20 | 10° – 33° |
| February | 34° | 15° | 1.1" | 8.2" | 7 | 17 | 15° – 35° |
| March | 47° | 27° | 2.0" | 4.8" | 8 | 8 | 29° – 52° |
| April | 61° | 37° | 3.8" | 0.9" | 10 | 1 | 41° – 55° |
| May | 72° | 49° | 5.0" | 0 | 12 | 0 | 55° – 68° |
| June | 81° | 60° | 5.2" | 0 | 12 | 0 | 67° – 75° |
| July | 84° | 63° | 4.4" | 0 | 10 | 0 | 68° – 79° |
| August | 82° | 60° | 4.2" | 0 | 9 | 0 | 66° – 76° |
| September | 76° | 52° | 3.4" | 0 | 8 | 0 | 58° – 69° |
| October | 63° | 40° | 2.7" | 0.6" | 8 | 0 | 45° – 56° |
| November | 47° | 27° | 1.7" | 1.5" | 6 | 2 | 27° – 49° |
| December | 34° | 17° | 1.3" | 7.5" | 7 | 13 | 9° – 32° |
| Year | 59° | 38° | 35.6" | 31.7" | 102 | 61 |
“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 Grand Junction
Grand Junction gets 36 inches of rain and melted snow a year. June is the wettest month and January the driest. Rain or snow falls on about 102 days a year. Snow covers the ground about 61 days of the year.
About 164 frost-free days a year
In half of years the last 32° night comes by April 26 and the first one by October 9. That leaves about 164 frost-free days for gardens, shorter than 67% of U.S. towns.
Heating and cooling a home in Grand Junction
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Grand Junction, 90% of that work is heating and 10% 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 Grand Junction 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 Grand Junction averaged 0.8° warmer than the 1900s. The biggest change is in December (+2.4°). The shift is smaller than in 87% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Grand Junction’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 9° to 32°. June is the most reliable, staying within 7°.
Common questions about Grand Junction’s climate
What is the coldest month in Grand Junction?
January, with a typical high of 29° and a low of 11°.
What is the hottest month in Grand Junction?
July, with a typical high of 84° and a low of 63°. About 19 days a year reach 90°.
How much snow does Grand Junction get?
About 32 inches in a normal winter, most of it in January.
When is the first frost in Grand Junction?
In half of years the first 32° night comes by October 9, and the last spring frost by April 26.
What is the rainiest month in Grand Junction?
June, with 5.2 inches of rain and melted snow. The year totals 36 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Grand Junction itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Jefferson, IA (8 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.