Prairie du Sac, WI climate
Prairie du Sac has cold, snowy winters and pleasant summers. A typical July afternoon reaches 83°, a January night drops to 10°, and about 43 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Prairie du Sac feels like
Winter
Spring
Summer
Fall
Prairie du Sac 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 | 28° | 10° | 1.3" | 11.3" | 8 | 22 | 7° – 32° |
| February | 33° | 14° | 1.3" | 10.1" | 7 | 23 | 11° – 35° |
| March | 44° | 24° | 2.1" | 5.9" | 9 | 11 | 26° – 50° |
| April | 58° | 35° | 3.8" | 2.6" | 11 | 2 | 37° – 53° |
| May | 70° | 47° | 4.1" | 0 | 13 | 0 | 52° – 65° |
| June | 79° | 57° | 5.2" | 0 | 12 | 0 | 65° – 73° |
| July | 83° | 61° | 4.4" | 0 | 10 | 0 | 66° – 79° |
| August | 81° | 59° | 4.2" | 0 | 10 | 0 | 65° – 75° |
| September | 74° | 51° | 3.5" | 0 | 10 | 0 | 56° – 68° |
| October | 60° | 38° | 2.7" | 0.4" | 10 | 0 | 45° – 56° |
| November | 46° | 28° | 2.2" | 2.1" | 8 | 3 | 28° – 46° |
| December | 33° | 17° | 1.6" | 10.3" | 9 | 15 | 11° – 36° |
| Year | 57° | 37° | 36.4" | 42.7" | 119 | 75 |
“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 Prairie du Sac
Prairie du Sac 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 119 days a year. Snow covers the ground about 75 days of the year.
About 155 frost-free days a year
In half of years the last 32° night comes by May 4 and the first one by October 6. That leaves about 155 frost-free days for gardens, shorter than 76% of U.S. towns.
Heating and cooling a home in Prairie du Sac
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Prairie du Sac, 93% of that work is heating and 7% 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.
Prairie du Sac and its neighbors
Prairie du Sac borders 4 towns with climate data. January nights across them vary by 0.4°. Lake Wisconsin has the coldest January nights (10°) and Prairie du Sac the hottest July afternoons (83°). Prairie du Sac’s January low is 10° and its July high 83°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Prairie du Sac 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 Prairie du Sac averaged 1.6° warmer than the 1900s. The biggest change is in December (+3.2°). The shift is larger than in 73% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Prairie du Sac’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 32°. June is the most reliable, staying within 8°.
Common questions about Prairie du Sac’s climate
What is the coldest month in Prairie du Sac?
January, with a typical high of 28° and a low of 10°.
What is the hottest month in Prairie du Sac?
July, with a typical high of 83° and a low of 61°. About 9 days a year reach 90°.
How much snow does Prairie du Sac get?
About 43 inches in a normal winter, most of it in January.
When is the first frost in Prairie du Sac?
In half of years the first 32° night comes by October 6, and the last spring frost by May 4.
What is the rainiest month in Prairie du Sac?
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 Prairie du Sac itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Baraboo, WI (11 mi, snow) and Sauk City WWTP, WI (2 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.