Stony Brook, New York Climate
United States
Pop. 13,740 Elev. 30 m / 98 ft
TZ: America/New_York (UTC-4) ·
Stony Brook sees mild summers peaking at 84°F (29°C) in July, and cold winters that bottom out around 26°F (-3°C) in January. Humidity pushes the summer feels-like temperature to 91°F (33°C), while wind chill can drive winter lows to 17°F (-8°C). Precipitation occurs on roughly 64 days per year (37.1 in / 943 mm total), with snow on 4 days and 29 in (741 mm) of annual accumulation. The city averages 128 sunny days per year and around 30 thunderstorm days. Ocean water temperatures reach 76°F (24°C) in summer.
| Temperature | 84°F (29°C) high | 26°F (-3°C) low |
| Feels like | 91°F (33°C) high | 17°F (-8°C) low |
| Rain | 64 days | 37.1 in (943 mm) /yr |
| Snow | 4 days | 29.2 in (741 mm) /yr |
| Sky | 128 sunny | 30 stormy |
| Wind | 3.4 mph (1.5 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Jun, Jul, Aug, Sep
Sky & Air by Month
Cloud cover (%)
42
Jan 63
Feb 55
Mar 67
Apr 72
May 65
Jun 58
Jul 42
Aug 52
Sep 42
Oct 50
Nov 54
Dec Humidity (%)
61
Jan 62
Feb 60
Mar 59
Apr 73
May 72
Jun 75
Jul 68
Aug 74
Sep 68
Oct 63
Nov 64
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 9 mi Long Island MacArthur Airport (ISP)
Ski resort 47 mi Mount Southington Ski Area
National park 106 mi Connecticut River Greenway State Park
Mountain peak
(4,971 ft) 224 mi Schofield Cobble
Hospital 2 mi Stony Brook University Hospital
Hiking trail 5 mi Chipmunk Loop Trail
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 36°F 2°C | 26°F -3°C | 0.9 in 22 mm | 4.6 in117 mm | 15 |
| February | 39°F 4°C | 28°F -2°C | 1.8 in 44 mm | 13.2 in334 mm | 6 |
| March | 51°F 11°C | 38°F 3°C | 4.2 in 105 mm | 0.0 in1 mm | 10 |
| April | 60°F 15°C | 46°F 8°C | 3.5 in 89 mm | 0.5 in13 mm | 5 |
| May | 66°F 19°C | 55°F 13°C | 6.4 in 162 mm | — | 6 |
| June | 78°F 26°C | 65°F 19°C | 1.9 in 49 mm | — | 8 |
| July | 84°F 29°C | 73°F 23°C | 3.6 in 91 mm | — | 11 |
| August | 78°F 26°C | 66°F 19°C | 1.9 in 48 mm | — | 16 |
| September | 75°F 24°C | 63°F 17°C | 3.0 in 76 mm | — | 10 |
| October | 64°F 18°C | 53°F 11°C | 6.2 in 158 mm | — | 17 |
| November | 52°F 11°C | 42°F 6°C | 2.0 in 52 mm | 0.1 in1 mm | 14 |
| December | 40°F 4°C | 29°F -1°C | 1.8 in 46 mm | 10.8 in275 mm | 10 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 15 | 1 |
| February | 6 | 1 |
| March | 10 | 2 |
| April | 5 | 3 |
| May | 6 | 7 |
| June | 8 | 1 |
| July | 11 | 2 |
| August | 16 | 1 |
| September | 10 | 5 |
| October | 17 | 5 |
| November | 14 | 1 |
| December | 10 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 43°F 6°C | 33°F 1°C |
| February | 36°F 2°C | 32°F 0°C |
| March | 41°F 5°C | 37°F 3°C |
| April | 51°F 10°C | 45°F 7°C |
| May | 57°F 14°C | 56°F 13°C |
| June | 70°F 21°C | 68°F 20°C |
| July | 76°F 24°C | 79°F 26°C |
| August | 76°F 24°C | 73°F 23°C |
| September | 72°F 22°C | 69°F 21°C |
| October | 70°F 21°C | 59°F 15°C |
| November | 59°F 15°C | 48°F 9°C |
| December | 49°F 9°C | 37°F 3°C |