Brookville, NY climate
Brookville has chilly winters and warm summers. A typical July afternoon reaches 85°, 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 Brookville feels like
Winter
Spring
Summer
Fall
Brookville 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° | 3.4" | 2.9" | 11 | 23° – 38° |
| February | 42° | 25° | 3.0" | 6.2" | 10 | 22° – 40° |
| March | 49° | 32° | 4.2" | 3.1" | 11 | 36° – 49° |
| April | 61° | 41° | 3.9" | 0.4" | 11 | 46° – 55° |
| May | 70° | 50° | 3.5" | 0 | 11 | 56° – 65° |
| June | 79° | 60° | 4.1" | 0 | 9 | 67° – 74° |
| July | 85° | 66° | 3.8" | 0 | 9 | 70° – 79° |
| August | 83° | 65° | 4.1" | 0 | 9 | 70° – 78° |
| September | 76° | 58° | 4.1" | 0 | 8 | 64° – 71° |
| October | 65° | 47° | 4.2" | 0 | 8 | 51° – 62° |
| November | 54° | 37° | 3.5" | 0.2" | 9 | 40° – 50° |
| December | 45° | 30° | 4.3" | 5.7" | 11 | 30° – 48° |
| Year | 62° | 45° | 46.0" | 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 Brookville
Brookville 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 213 frost-free days a year
In half of years the last 32° night comes by April 6 and the first one by November 6. That leaves about 213 frost-free days for gardens, longer than 79% of U.S. towns.
Heating and cooling a home in Brookville
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Brookville, 85% of that work is heating and 15% 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.
Brookville and its neighbors
Brookville borders 5 towns with climate data. January nights across them vary by 1.7°. Muttontown has the coldest January nights (24°) and Old Westbury the hottest July afternoons (85°). Brookville’s January low is 24° and its July high 85°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Brookville 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 Brookville 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 Brookville’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 48°. September is the most reliable, staying within 7°.
Common questions about Brookville’s climate
What is the coldest month in Brookville?
January, with a typical high of 40° and a low of 24°.
What is the hottest month in Brookville?
July, with a typical high of 85° and a low of 66°. About 9 days a year reach 90°.
How much snow does Brookville get?
About 19 inches in a normal winter, most of it in February.
When is the first frost in Brookville?
In half of years the first 32° night comes by November 6, and the last spring frost by April 6.
What is the rainiest month in Brookville?
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 Brookville itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Mineola, NY (6 mi, snow) and Farmingdale Airport, NY (10 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.