Locust Valley has chilly winters and warm summers
A typical July afternoon reaches 85°, a January night drops to 26°, and about 19 inches of snow falls in a normal winter.
A year in Locust Valley at a glance
Each month’s typical high and low, and what it brings.
What stands out about Locust Valley’s climate
Read from where Locust Valley sits among New York’s towns. The page puts what stands out first.
What a year in Locust Valley feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
19 inches of snow, 46 of rain and melt
September 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 Locust Valley’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
224 frost-free days. The last frost comes by Apr 2 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 12.
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 80% of the year’s heating-and-cooling load.
About 16 days a year reach 90°, and July afternoons average 85°.
The nicest months are May, June, August, September and October. 1.2 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 →About 224 frost-free days a year
In half of years the last 32° night comes by April 2 and the first by November 12.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Warmer than it used to be
The last 30 years in Locust Valley averaged 2.2° warmer than the 1900s. The biggest change is in December (+3.7°).
A bigger shift than in 98% of U.S. towns.
Change by month
Locust Valley and its neighbors
Oyster Bay has the coldest January nights next door (24°) and Lattingtown 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 Locust Valley compares
Against every U.S. town on TownTapestry, each counted once, with its place in New York.
Locust Valley 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° | 26° | 3.4" | 2.9" | 11 | 24° – 39° |
| February | 42° | 27° | 2.9" | 6.2" | 10 | 22° – 41° |
| March | 49° | 33° | 4.1" | 3.1" | 11 | 36° – 50° |
| April | 60° | 42° | 4.0" | 0.4" | 11 | 47° – 56° |
| May | 70° | 52° | 3.7" | 0 | 11 | 57° – 66° |
| June | 79° | 62° | 4.0" | 0 | 9 | 67° – 74° |
| July | 85° | 68° | 4.1" | 0 | 9 | 71° – 80° |
| August | 83° | 67° | 4.2" | 0 | 9 | 71° – 79° |
| September | 76° | 60° | 4.4" | 0 | 8 | 65° – 72° |
| October | 65° | 49° | 4.2" | 0 | 8 | 52° – 64° |
| November | 54° | 39° | 3.4" | 0.2" | 9 | 42° – 51° |
| December | 45° | 31° | 4.2" | 5.7" | 11 | 31° – 49° |
| Year | 62° | 46° | 46.5" | 18.5" | 114 |
Heating and cooling a home in Locust Valley
80% 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 31° to 49°. September is the most reliable, staying within 7°.
Common questions about Locust Valley’s climate
What is the coldest month in Locust Valley?
January, with a typical high of 40° and a low of 26°.
What is the hottest month in Locust Valley?
July, with a typical high of 85° and a low of 68°. About 16 days a year reach 90°.
How much snow does Locust Valley get?
About 19 inches in a normal winter, most of it in February.
When is the first frost in Locust Valley?
In half of years the first 32° night comes by November 12, and the last spring frost by April 2.
What is the rainiest month in Locust Valley?
September, with 4.4 inches of rain and melted snow. The year totals 46 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Locust Valley.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Locust Valley itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Mineola, NY (10 mi) away. 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.