Stony Brook, MN climate
Stony Brook has cold winters and pleasant summers. A typical July afternoon reaches 81°, a January night drops to 1°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Stony Brook feels like
Winter
Spring
Summer
Fall
Stony Brook 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 | 19° | 1° | 0.7" | -4° – 24° |
| February | 24° | 5° | 0.7" | 3° – 27° |
| March | 37° | 19° | 1.1" | 18° – 42° |
| April | 54° | 32° | 2.0" | 33° – 52° |
| May | 68° | 45° | 3.0" | 52° – 64° |
| June | 77° | 56° | 4.2" | 62° – 71° |
| July | 81° | 60° | 4.1" | 63° – 76° |
| August | 80° | 57° | 3.1" | 61° – 72° |
| September | 72° | 49° | 2.8" | 53° – 66° |
| October | 56° | 36° | 2.5" | 38° – 51° |
| November | 39° | 22° | 0.9" | 19° – 42° |
| December | 25° | 8° | 0.8" | 2° – 25° |
| Year | 53° | 32° | 25.8" |
“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 Stony Brook
Stony Brook gets 26 inches of rain and melted snow a year. June is the wettest month and February the driest.
About 152 frost-free days a year
In half of years the last 32° night comes by May 4 and the first one by October 5. That leaves about 152 frost-free days for gardens, shorter than 79% of U.S. towns.
Heating and cooling a home in Stony Brook
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Stony Brook, 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.
Stony Brook and its neighbors
Stony Brook borders 4 towns with climate data. January nights across them vary by 0.4°. Pomme de Terre has the coldest January nights (1°) and Lawrence the hottest July afternoons (82°). Stony Brook’s January low is 1° and its July high 81°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Stony Brook 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 Stony Brook averaged 1.4° warmer than the 1900s. The biggest change is in January (+3.4°). The shift is larger than in 64% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Stony Brook’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 -4° to 24°. June is the most reliable, staying within 9°.
Common questions about Stony Brook’s climate
What is the coldest month in Stony Brook?
January, with a typical high of 19° and a low of 1°.
What is the hottest month in Stony Brook?
July, with a typical high of 81° and a low of 60°. About 8 days a year reach 90°.
When is the first frost in Stony Brook?
In half of years the first 32° night comes by October 5, and the last spring frost by May 4.
What is the rainiest month in Stony Brook?
June, with 4.2 inches of rain and melted snow. The year totals 26 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Stony Brook itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Fergus Falls, MN (16 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.