New Haven, WI climate
New Haven has cold, snowy winters and pleasant summers. A typical July afternoon reaches 81°, a January night drops to 4°, and about 51 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in New Haven feels like
Winter
Spring
Summer
Fall
New Haven 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 | 22° | 4° | 1.0" | 9.5" | 6 | 29 | 1° – 26° |
| February | 28° | 8° | 1.0" | 11.4" | 5 | 26 | 5° – 31° |
| March | 41° | 20° | 1.8" | 10.9" | 7 | 20 | 22° – 46° |
| April | 55° | 32° | 3.1" | 3.3" | 10 | 4 | 33° – 51° |
| May | 68° | 45° | 4.1" | 0 | 11 | 0 | 51° – 64° |
| June | 77° | 55° | 4.9" | 0 | 11 | 0 | 62° – 70° |
| July | 81° | 59° | 4.2" | 0 | 9 | 0 | 64° – 75° |
| August | 79° | 57° | 4.2" | 0 | 10 | 0 | 63° – 72° |
| September | 71° | 49° | 3.7" | 0 | 10 | 0 | 52° – 66° |
| October | 57° | 36° | 2.9" | 0.6" | 9 | 1 | 40° – 52° |
| November | 41° | 24° | 1.8" | 4.1" | 7 | 4 | 24° – 44° |
| December | 28° | 12° | 1.3" | 11.2" | 7 | 22 | 6° – 30° |
| Year | 54° | 33° | 34.0" | 51.0" | 103 | 107 |
“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 New Haven
New Haven gets 34 inches of rain and melted snow a year. June is the wettest month and January the driest. Rain or snow falls on about 103 days a year. Snow covers the ground about 107 days of the year.
About 140 frost-free days a year
In half of years the last 32° night comes by May 10 and the first one by September 29. That leaves about 140 frost-free days for gardens, shorter than 89% of U.S. towns.
Heating and cooling a home in New Haven
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In New Haven, 96% of that work is heating and 4% 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.
New Haven and its neighbors
New Haven borders 4 towns with climate data. January nights across them vary by 0.4°. Vance Creek has the coldest January nights (4°) and Tiffany the hottest July afternoons (82°). New Haven’s January low is 4° and its July high 81°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How New Haven 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 New Haven averaged 1.6° warmer than the 1900s. The biggest change is in December (+3.6°). The shift is larger than in 75% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at New Haven’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 5° to 31°. June is the most reliable, staying within 8°.
Common questions about New Haven’s climate
What is the coldest month in New Haven?
January, with a typical high of 22° and a low of 4°.
What is the hottest month in New Haven?
July, with a typical high of 81° and a low of 59°. About 4 days a year reach 90°.
How much snow does New Haven get?
About 51 inches in a normal winter, most of it in February.
When is the first frost in New Haven?
In half of years the first 32° night comes by September 29, and the last spring frost by May 10.
What is the rainiest month in New Haven?
June, with 4.9 inches of rain and melted snow. The year totals 34 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for New Haven itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Ridgeland 1nne, WI (11 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.