Greendale, WI climate
Greendale has cold, snowy winters and pleasant summers. A typical July afternoon reaches 82°, a January night drops to 14°, and about 40 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Greendale feels like
Winter
Spring
Summer
Fall
Greendale 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° | 14° | 1.7" | 11.0" | 10 | 20 | 12° – 33° |
| February | 33° | 17° | 1.6" | 9.9" | 9 | 17 | 13° – 35° |
| March | 44° | 26° | 2.1" | 5.3" | 9 | 7 | 27° – 49° |
| April | 56° | 35° | 3.7" | 1.5" | 12 | 1 | 38° – 51° |
| May | 67° | 46° | 3.8" | 0 | 13 | 0 | 51° – 62° |
| June | 77° | 56° | 4.4" | 0 | 11 | 0 | 63° – 72° |
| July | 82° | 61° | 3.5" | 0 | 10 | 0 | 67° – 78° |
| August | 80° | 60° | 3.8" | 0 | 10 | 0 | 65° – 75° |
| September | 73° | 52° | 3.3" | 0 | 9 | 0 | 57° – 67° |
| October | 60° | 41° | 2.9" | 0 | 11 | 0 | 46° – 57° |
| November | 46° | 30° | 2.2" | 2.0" | 9 | 2 | 29° – 47° |
| December | 34° | 20° | 1.9" | 9.8" | 10 | 12 | 15° – 37° |
| Year | 57° | 38° | 34.9" | 39.5" | 120 | 58 |
“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 Greendale
Greendale gets 35 inches of rain and melted snow a year. June is the wettest month and February the driest. Rain or snow falls on about 120 days a year. Snow covers the ground about 58 days of the year.
About 162 frost-free days a year
In half of years the last 32° night comes by May 3 and the first one by October 14. That leaves about 162 frost-free days for gardens, shorter than 69% of U.S. towns.
Heating and cooling a home in Greendale
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Greendale, 92% of that work is heating and 8% 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.
Greendale and its neighbors
Greendale borders 3 towns with climate data. January nights across them vary by 0.4°. Hales Corners has the coldest January nights (14°) and Franklin the hottest July afternoons (82°). Greendale’s January low is 14° and its July high 82°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Greendale 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 Greendale averaged 1.3° warmer than the 1900s. The biggest change is in December (+2.9°). The shift is larger than in 53% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Greendale’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 13° to 35°. June is the most reliable, staying within 9°.
Common questions about Greendale’s climate
What is the coldest month in Greendale?
January, with a typical high of 29° and a low of 14°.
What is the hottest month in Greendale?
July, with a typical high of 82° and a low of 61°. About 12 days a year reach 90°.
How much snow does Greendale get?
About 40 inches in a normal winter, most of it in January.
When is the first frost in Greendale?
In half of years the first 32° night comes by October 14, and the last spring frost by May 3.
What is the rainiest month in Greendale?
June, with 4.4 inches of rain and melted snow. The year totals 35 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Greendale itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Mt Mary College, WI (9 mi, snow) and Hales Corners/whitnall Park/bo, WI (1 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.