Brightwaters, NY climate
Brightwaters has chilly, snowy winters and pleasant summers. A typical July afternoon reaches 83°, a January night drops to 26°, and about 32 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Brightwaters feels like
Winter
Spring
Summer
Fall
Brightwaters 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 | 40° | 26° | 3.4" | 10.3" | 11 | 7 | 25° – 39° |
| February | 42° | 27° | 3.0" | 9.4" | 10 | 9 | 23° – 40° |
| March | 49° | 33° | 4.2" | 6.5" | 11 | 4 | 36° – 48° |
| April | 59° | 41° | 3.9" | 0.6" | 11 | 0 | 46° – 54° |
| May | 68° | 51° | 3.4" | 0 | 12 | 0 | 55° – 64° |
| June | 78° | 61° | 4.0" | 0 | 10 | 0 | 66° – 73° |
| July | 83° | 67° | 3.4" | 0 | 9 | 0 | 70° – 79° |
| August | 82° | 66° | 3.9" | 0 | 9 | 0 | 70° – 78° |
| September | 75° | 60° | 3.9" | 0 | 9 | 0 | 65° – 72° |
| October | 65° | 48° | 4.0" | 0 | 9 | 0 | 52° – 63° |
| November | 54° | 39° | 3.4" | 0.5" | 10 | 0 | 41° – 51° |
| December | 45° | 31° | 4.3" | 4.5" | 12 | 3 | 31° – 50° |
| Year | 62° | 46° | 44.7" | 31.8" | 122 | 23 |
“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 Brightwaters
Brightwaters gets 45 inches of rain and melted snow a year. December is the wettest month and February the driest. Rain or snow falls on about 122 days a year. Snow covers the ground about 23 days of the year.
About 207 frost-free days a year
In half of years the last 32° night comes by April 10 and the first one by November 2. That leaves about 207 frost-free days for gardens, longer than 76% of U.S. towns.
Heating and cooling a home in Brightwaters
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Brightwaters, 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.
How Brightwaters 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 Brightwaters averaged 2.3° warmer than the 1900s. The biggest change is in December (+3.7°). The shift is larger than in 99% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Brightwaters’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 31° to 50°. June is the most reliable, staying within 7°.
Common questions about Brightwaters’s climate
What is the coldest month in Brightwaters?
January, with a typical high of 40° and a low of 26°.
What is the hottest month in Brightwaters?
July, with a typical high of 83° and a low of 67°. About 8 days a year reach 90°.
How much snow does Brightwaters get?
About 32 inches in a normal winter, most of it in January.
When is the first frost in Brightwaters?
In half of years the first 32° night comes by November 2, and the last spring frost by April 10.
What is the rainiest month in Brightwaters?
December, with 4.3 inches of rain and melted snow. The year totals 45 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Brightwaters itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Islip Li Macarthur Airport, NY (10 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.