Grand Plain, MN climate
Grand Plain has cold winters and pleasant summers, with very little rain. A typical July afternoon reaches 79°, a January night drops to -4°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Grand Plain feels like
Winter
Spring
Summer
Fall
Grand Plain weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 15° | -4° | 0.6" | -7° – 22° |
| February | 21° | 0° | 0.5" | -1° – 26° |
| March | 35° | 14° | 0.7" | 14° – 37° |
| April | 52° | 29° | 1.3" | 30° – 49° |
| May | 66° | 41° | 2.7" | 48° – 60° |
| June | 75° | 52° | 3.8" | 58° – 70° |
| July | 79° | 56° | 3.5" | 61° – 74° |
| August | 78° | 53° | 3.0" | 58° – 69° |
| September | 68° | 45° | 2.6" | 51° – 62° |
| October | 53° | 33° | 1.9" | 34° – 48° |
| November | 34° | 19° | 0.9" | 15° – 39° |
| December | 21° | 4° | 0.9" | -2° – 22° |
| Year | 50° | 29° | 22.4" |
“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 Plain
Grand Plain gets 22 inches of rain and melted snow a year. June is the wettest month and February the driest.
About 148 frost-free days a year
In half of years the last 32° night comes by May 6 and the first one by October 3. That leaves about 148 frost-free days for gardens, shorter than 82% of U.S. towns.
Heating and cooling a home in Grand Plain
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Grand Plain, 95% of that work is heating and 5% 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.
Grand Plain and its neighbors
Grand Plain borders 3 towns with climate data. January nights across them vary by 0.3°. Moylan has the coldest January nights (-4°) and Agder the hottest July afternoons (79°). Grand Plain’s January low is -4° and its July high 79°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Grand Plain 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 Plain averaged 1.7° warmer than the 1900s. The biggest change is in January (+4.3°). The shift is larger than in 78% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Grand Plain’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 -7° to 22°. August is the most reliable, staying within 11°.
Common questions about Grand Plain’s climate
What is the coldest month in Grand Plain?
January, with a typical high of 15° and a low of -4°.
What is the hottest month in Grand Plain?
July, with a typical high of 79° and a low of 56°. About 4 days a year reach 90°.
When is the first frost in Grand Plain?
In half of years the first 32° night comes by October 3, and the last spring frost by May 6.
What is the rainiest month in Grand Plain?
June, with 3.8 inches of rain and melted snow. The year totals 22 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Grand Plain itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Agassiz Refuge, MN (6 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.