Stony Brook
New York, USA
Long-term weather forecast
Long-term weather forecast

April weather forecast and climate
Stony Brook, NY

April is a cool spring month in Stony Brook, New York, with average temperature ranging between min 44.6°F (7°C) and max 52.9°F (11.6°C).

Temperature

In Stony Brook, the average high-temperature in April increases, from a chilly 43.9°F (6.6°C) in March, to a fresh 52.9°F (11.6°C). The average low-temperature, in Stony Brook, is 44.6°F (7°C).

Humidity

In Stony Brook, the average relative humidity is 73%.

Rainfall

In Stony Brook, during April, the rain falls for 13.5 days and regularly aggregates up to 2.83" (72mm) of precipitation. Throughout the year, there are 146.8 rainfall days, and 33.78" (858mm) of precipitation is accumulated.

Snowfall

April through September are months without snowfall in Stony Brook.

Ocean temperature

In Stony Brook, the average water temperature is 45.3°F (7.4°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

In Stony Brook, New York, the average length of the day is 13.3h.

Sunshine

In Stony Brook, the average sunshine is 8.4h.

UV index

In Stony Brook, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in April in Stony Brook?

The average high-temperature, in April, in Stony Brook, New York, is 52.9°F (11.6°C), while the average low-temperature is 44.6°F (7°C).

What is the average humidity in April in Stony Brook?

The average relative humidity in April in Stony Brook is 73%.

How many days does it rain in April in Stony Brook?

In Stony Brook, New York, in April, during 13.5 rainfall days, 2.83" (72mm) of precipitation is typically accumulated.

Does it snow in Stony Brook in April?

In April, in Stony Brook, it doesn't snow. March is the latest month when it typically snows.

When it does not snow in Stony Brook?

April through September are months without snowfall in Stony Brook, New York.

What is the ocean temperature in April in Stony Brook?

In Stony Brook, in April, the average water temperature is 45.3°F (7.4°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

How many hours of daylight does Stony Brook have in April?

The average length of the day in April in Stony Brook, New York, is 13.3h.

How long on average sun shines in April in Stony Brook?

The average sunshine in April is 8.4h.

How high is the UV index in April in Stony Brook?

In April, the average daily maximum UV index in Stony Brook, New York, is 3. A UV Index reading of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.
Average temperature in April - Stony Brook, NY
  • Average high temperature in April: 52.9°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 April: 44.6°F

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 humidity in April - Stony Brook, NY
  • Average humidity in April: 73%

Months with the highest relative humidity are May and June (77%).
The month with the lowest relative humidity is November (71%).

Average rainfall in April - Stony Brook, NY
  • Average rainfall in April: 2.83"

The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the lowest rainfall) is January (2.05").

Average rainfall days in April - Stony Brook, NY
  • Average rainfall days in April: 13.5 days

The month with the highest number of rainy days is July (16.5 days).
The month with the lowest number of rainy days is January (6.8 days).

Average snowfall in April - Stony Brook, NY
  • Average snowfall in April: 0"

The month with the highest snowfall is March (2.13").
Months with the lowest snowfall are April, May, June, July, August and September (0").

Average snowfall days in April - Stony Brook, NY
  • Average snowfall days in April: 0.2 days

The month with the highest number of snowfall days is February (4.4 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average sea temperature in April - Stony Brook, NY
  • Average sea temperature in April: 45.4°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 April / Average sunshine in April - Stony Brook, NY
  • Average daylight in April: 13.3h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.3h).

  • Average sunshine in April: 8.4h

The month with most sunshine is July (Average sunshine: 10.6h).
The month with least sunshine is February (Average sunshine: 4.7h).

Average UV index in April - Stony Brook, NY
  • Average UV index in April: 3

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).