July weather forecastStony Brook, NY
July
Weather in July
July in Stony Brook, New York, is a moderately hot summer month, with an average temperature fluctuating between 71.1°F (21.7°C) and 79.2°F (26.2°C).Temperature
The temperatures reach their highest averages in July, with highs of 79.2°F (26.2°C) and lows of 71.1°F (21.7°C).Humidity
In Stony Brook, New York, the average relative humidity in July is 76%.Rainfall
In Stony Brook, in July, it is raining for 16.5 days, with typically 3.54" (90mm) of accumulated precipitation. Throughout the year, there are 146.8 rainfall days, and 33.78" (858mm) of precipitation is accumulated.Snowfall
In Stony Brook, snow does not fall in April through September.Ocean temperature
In Stony Brook, the average seawater temperature in July is 72.1°F (22.3°C).Note: Every individual's cold threshold differs, but factors like today's sunshine, wind, and temperature can tip the scales for a delightful swim in 72.1°F (22.3°C) waters. For reference, Olympians swim in waters of 77°F (25°C) to 82.4°F (28°C).
Daylight
In July, the average length of the day is 14h and 46min.On the first day of July, sunrise is at 5:24 am and sunset at 8:28 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 8:09 pm EDT.
Sunshine
With an average of 10.6h of sunshine, July has the most sunshine of the year.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: An average maximum UV index of 6 in July leads to these recommendations:
Use protective steps and abide by sun safety guidelines. Safeguarding against skin and eye harm is necessary. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Notice! The Sun's UV exposure elevates with sand and water reflections.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Stony Brook, NY
- Average high temperature in July: 79.2°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (37.6°F).
- Average low temperature in July: 71.1°F
The months with the highest average low temperature are July and August (71.1°F).
The coldest month (with the lowest average low temperature) is January (29.1°F).
Average pressure in July
Stony Brook, NY
- Average pressure in July: 29.95"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in July
Stony Brook, NY
- Average wind speed in July: 8.3mph
The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest month (with the lowest average wind speed) is July (8.3mph).
Average humidity in July
Stony Brook, NY
- Average humidity in July: 76%
The months with the highest relative humidity are May and June (77%).
The month with the lowest relative humidity is November (71%).
Average rainfall in July
Stony Brook, NY
- Average rainfall in July: 3.54"
The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is January (2.05").
Average rainfall days in July
Stony Brook, NY
- Average rainfall days in July: 16.5 days
The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in July
Stony Brook, NY
- Average snowfall in July: 0"
The month with the highest snowfall is March (2.13").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days in July
Stony Brook, NY
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is February (4.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in July
Stony Brook, NY
- Average sea temperature in July: 72.1°F
The best month for swimming (with the highest average sea temperature) is August (74°F).
The coldest month (with the lowest average sea temperature) is February (39.7°F).
Average daylight in July /
Average sunshine in July
Stony Brook, NY
- Average daylight in July: 14h and 48min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in July: 10h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in July
Stony Brook, NY
- Average sunshine days in July: 13 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is July (13 days).
Average UV index in July
Stony Brook, NY
- Average UV index in July: 6
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in July
Stony Brook, NY
- Average cloud cover in July: 30
The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in July
Stony Brook, NY
- Average visibility in July: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
