Muttontown, NY climate
Muttontown has chilly winters and warm summers. A typical July afternoon reaches 84°, a January night drops to 24°, and about 19 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Muttontown feels like
Winter
Spring
Summer
Fall
Muttontown 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 | 30-yr range |
|---|---|---|---|---|---|---|
| January | 40° | 24° | 3.3" | 2.9" | 11 | 23° – 38° |
| February | 42° | 25° | 2.9" | 6.2" | 10 | 22° – 40° |
| March | 49° | 32° | 4.2" | 3.1" | 11 | 35° – 48° |
| April | 60° | 41° | 3.9" | 0.4" | 11 | 46° – 55° |
| May | 70° | 50° | 3.5" | 0 | 11 | 56° – 65° |
| June | 79° | 60° | 4.1" | 0 | 9 | 66° – 74° |
| July | 84° | 66° | 3.8" | 0 | 9 | 70° – 80° |
| August | 83° | 64° | 4.1" | 0 | 9 | 70° – 77° |
| September | 76° | 57° | 4.1" | 0 | 8 | 64° – 71° |
| October | 65° | 46° | 4.1" | 0 | 8 | 51° – 62° |
| November | 54° | 37° | 3.4" | 0.2" | 9 | 40° – 50° |
| December | 45° | 30° | 4.3" | 5.7" | 11 | 30° – 49° |
| Year | 62° | 44° | 45.5" | 18.5" | 114 |
“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 Muttontown
Muttontown gets 46 inches of rain and melted snow a year. December is the wettest month and February the driest. Rain or snow falls on about 114 days a year.
About 215 frost-free days a year
In half of years the last 32° night comes by April 9 and the first one by November 10. That leaves about 215 frost-free days for gardens, longer than 80% of U.S. towns.
Heating and cooling a home in Muttontown
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Muttontown, 86% of that work is heating and 14% 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.
Muttontown and its neighbors
Muttontown borders 2 towns with climate data. January nights across them vary by 1.0°. Brookville has both the coldest January nights (24°) and the hottest July afternoons (85°). Muttontown’s January low is 24° and its July high 84°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Muttontown 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 Muttontown averaged 2.2° warmer than the 1900s. The biggest change is in December (+3.6°). The shift is larger than in 98% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Muttontown’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 30° to 49°. September is the most reliable, staying within 7°.
Common questions about Muttontown’s climate
What is the coldest month in Muttontown?
January, with a typical high of 40° and a low of 24°.
What is the hottest month in Muttontown?
July, with a typical high of 84° and a low of 66°. About 11 days a year reach 90°.
How much snow does Muttontown get?
About 19 inches in a normal winter, most of it in February.
When is the first frost in Muttontown?
In half of years the first 32° night comes by November 10, and the last spring frost by April 9.
What is the rainiest month in Muttontown?
December, with 4.3 inches of rain and melted snow. The year totals 46 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Muttontown itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Mineola, NY (8 mi, snow) and Centerport, NY (9 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.