Sag Harbor, NY climate
Sag Harbor has chilly winters and pleasant summers. A typical July afternoon reaches 81°, a January night drops to 24°, and about 27 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Sag Harbor feels like
Winter
Spring
Summer
Fall
Sag Harbor 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 | 39° | 24° | 3.5" | 7.2" | 10 | 7 | 24° – 38° |
| February | 41° | 25° | 3.1" | 8.6" | 10 | 7 | 20° – 38° |
| March | 47° | 31° | 4.5" | 6.0" | 10 | 4 | 33° – 46° |
| April | 56° | 39° | 3.9" | 0.8" | 11 | 0 | 44° – 52° |
| May | 66° | 49° | 3.4" | 0 | 10 | 0 | 53° – 61° |
| June | 75° | 58° | 3.6" | 0 | 9 | 0 | 64° – 70° |
| July | 81° | 65° | 3.0" | 0 | 8 | 0 | 68° – 76° |
| August | 80° | 64° | 3.7" | 0 | 8 | 0 | 69° – 76° |
| September | 74° | 58° | 3.9" | 0 | 8 | 0 | 63° – 69° |
| October | 64° | 47° | 4.5" | 0 | 9 | 0 | 52° – 61° |
| November | 54° | 38° | 3.7" | 0.1" | 10 | 0 | 41° – 49° |
| December | 45° | 30° | 4.5" | 4.1" | 11 | 4 | 31° – 48° |
| Year | 60° | 44° | 45.2" | 26.8" | 114 | 21 |
“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 Sag Harbor
Sag Harbor gets 45 inches of rain and melted snow a year. December is the wettest month and July the driest. Rain or snow falls on about 114 days a year. Snow covers the ground about 21 days of the year.
About 182 frost-free days a year
In half of years the last 32° night comes by April 23 and the first one by October 24. That leaves about 182 frost-free days for gardens, longer than 55% of U.S. towns.
Heating and cooling a home in Sag Harbor
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Sag Harbor, 91% of that work is heating and 9% 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.
Sag Harbor and its neighbors
Sag Harbor borders 3 towns with climate data. January nights across them vary by 0.5°. Noyack has both the coldest January nights (24°) and the hottest July afternoons (81°). Sag Harbor’s January low is 24° and its July high 81°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Sag Harbor 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 Sag Harbor averaged 1.9° warmer than the 1900s. The biggest change is in December (+3.3°). The shift is larger than in 91% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Sag Harbor’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 20° to 38°. June is the most reliable, staying within 6°.
Common questions about Sag Harbor’s climate
What is the coldest month in Sag Harbor?
January, with a typical high of 39° and a low of 24°.
What is the hottest month in Sag Harbor?
July, with a typical high of 81° and a low of 65°. About 5 days a year reach 90°.
How much snow does Sag Harbor get?
About 27 inches in a normal winter, most of it in February.
When is the first frost in Sag Harbor?
In half of years the first 32° night comes by October 24, and the last spring frost by April 23.
What is the rainiest month in Sag Harbor?
December, with 4.5 inches of rain and melted snow. The year totals 45 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Sag Harbor itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Bridgehampton, NY (3 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.