Delafield, WI climate
Delafield has cold, snowy winters and pleasant summers. A typical July afternoon reaches 82°, a January night drops to 12°, and about 37 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Delafield feels like
Winter
Spring
Summer
Fall
Delafield 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° | 12° | 1.6" | 10.4" | 9 | 20 | 10° – 32° |
| February | 32° | 15° | 1.6" | 10.1" | 8 | 19 | 11° – 35° |
| March | 43° | 25° | 2.0" | 4.6" | 8 | 8 | 26° – 49° |
| April | 56° | 35° | 3.7" | 1.1" | 11 | 1 | 36° – 51° |
| May | 68° | 46° | 4.1" | 0 | 13 | 0 | 51° – 63° |
| June | 78° | 56° | 4.8" | 0 | 11 | 0 | 63° – 72° |
| July | 82° | 60° | 4.0" | 0 | 9 | 0 | 65° – 78° |
| August | 80° | 59° | 3.9" | 0 | 9 | 0 | 64° – 75° |
| September | 73° | 51° | 3.3" | 0 | 9 | 0 | 56° – 67° |
| October | 60° | 39° | 2.9" | 0.1" | 10 | 0 | 45° – 56° |
| November | 45° | 29° | 2.2" | 1.8" | 9 | 2 | 28° – 46° |
| December | 33° | 18° | 1.9" | 8.8" | 9 | 12 | 13° – 36° |
| Year | 56° | 37° | 35.9" | 36.9" | 115 | 62 |
“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 Delafield
Delafield gets 36 inches of rain and melted snow a year. June is the wettest month and February the driest. Rain or snow falls on about 115 days a year. Snow covers the ground about 62 days of the year.
About 162 frost-free days a year
In half of years the last 32° night comes by May 1 and the first one by October 13. That leaves about 162 frost-free days for gardens, shorter than 69% of U.S. towns.
Heating and cooling a home in Delafield
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Delafield, 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.
Delafield and its neighbors
Delafield borders 5 towns with climate data. January nights across them vary by 0.6°. Lisbon has the coldest January nights (12°) and Pewaukee the hottest July afternoons (82°). Delafield’s January low is 12° and its July high 82°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Delafield 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 Delafield averaged 1.3° warmer than the 1900s. The biggest change is in December (+3.1°). The shift is larger than in 60% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Delafield’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 11° to 35°. June is the most reliable, staying within 8°.
Common questions about Delafield’s climate
What is the coldest month in Delafield?
January, with a typical high of 28° and a low of 12°.
What is the hottest month in Delafield?
July, with a typical high of 82° and a low of 60°. About 11 days a year reach 90°.
How much snow does Delafield get?
About 37 inches in a normal winter, most of it in January.
When is the first frost in Delafield?
In half of years the first 32° night comes by October 13, and the last spring frost by May 1.
What is the rainiest month in Delafield?
June, with 4.8 inches of rain and melted snow. The year totals 36 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Delafield itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Waukesha WWTP, WI (6 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.