Syosset 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.
A year in Syosset at a glance
Each month’s typical high and low, and what it brings.
What stands out about Syosset’s climate
Read from where Syosset sits among New York’s towns. The page puts what stands out first.
19 inches of snow, 46 of rain and melt
December is the wettest month and February the driest. Rain or snow falls on about 114 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Living with Syosset’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
215 frost-free days. The last frost comes by Apr 9 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 10.
About 19" a winter over 6 days with an inch or more, most in February.
Months averaging under 55° run from November through April. Heating is 86% of the year’s heating-and-cooling load.
About 11 days a year reach 90°, and July afternoons average 84°.
The nicest months are May, June, August, September and October. 0.0 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →Warmer than it used to be
The last 30 years in Syosset averaged 2.2° warmer than the 1900s. The biggest change is in December (+3.6°).
A bigger shift than in 98% of U.S. towns.
Change by month
What a year in Syosset feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 215 frost-free days a year
In half of years the last 32° night comes by April 9 and the first by November 10.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Syosset and its neighbors
Jericho has the coldest January nights next door (24°) and Jericho the hottest July afternoons (85°). Tap a town to see its climate.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
How Syosset compares
Against every U.S. town on TownTapestry, each counted once, with its place in New York.
Syosset 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 |
Heating and cooling a home in Syosset
86% of the work is heating, so the furnace matters far more than the air conditioner.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 30° to 49°. September is the most reliable, staying within 7°.
Common questions about Syosset’s climate
What is the coldest month in Syosset?
January, with a typical high of 40° and a low of 24°.
What is the hottest month in Syosset?
July, with a typical high of 84° and a low of 66°. About 11 days a year reach 90°.
How much snow does Syosset get?
About 19 inches in a normal winter, most of it in February.
When is the first frost in Syosset?
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 Syosset?
December, with 4.3 inches of rain and melted snow. The year totals 46 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Syosset.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Syosset 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 (8 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. Today’s forecast: National Weather Service.