Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average snowfall in April
- Average snowfall days in April
- Average sea temperature in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
The start of April signals an increase in the average high-temperature, moving from a frosty 43.9°F (6.6°C) in March to a fresh 52.9°F (11.6°C). Port Jefferson sees a minor drop to an average minimum temperature of 44.6°F (7°C) during the night in the month of April.Humidity
In April, the average relative humidity in Port Jefferson is 73%.Rainfall
In Port Jefferson, during April, the rain falls for 13.5 days and regularly aggregates up to 2.83" (72mm) of precipitation. In Port Jefferson, New York, during the entire year, the rain falls for 146.8 days and collects up to 33.78" (858mm) of precipitation.Snowfall
April through September are months without snowfall.Ocean temperature
In Port Jefferson, New York, in April, the average water temperature is 45.3°F (7.4°C).Note: In 45.3°F (7.4°C), cold shock and rapid breathing can occur when swimming at temperatures below 50°F (10°C).
Daylight
In Port Jefferson, New York, the average length of the day in April is 13h and 20min.On the first day of April in Port Jefferson, New York, sunrise is at 6:34 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 5:50 am and sunset at 7:48 pm EDT.
Sunshine
The average sunshine in April in Port Jefferson, New York, is 8.4h.UV index
In Port Jefferson, the average daily maximum UV index in April is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: During April, 3 as the daily maximum UV index converts into the following advice:
Undertake precautions - Guarding against sun damage is counselled. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Frequently asked questions
What are the temperatures in Port Jefferson in April?
What is the average humidity in April in Port Jefferson?
How many days does it rain in April in Port Jefferson?
When it does not snow in Port Jefferson?
Does it snow in Port Jefferson in April?
How cold is the water in April in Port Jefferson?
What is the average length of the day in April in Port Jefferson?
When are sunrise and sunset in April in Port Jefferson?
How long on average sun shines in April in Port Jefferson?
How high is the UV index in April in Port Jefferson?
Average temperature in April
Port Jefferson, 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
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 April
Port Jefferson, NY
- Average pressure in April: 29.98"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 April
Port Jefferson, NY
- Average wind speed in April: 11.2mph
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 April
Port Jefferson, NY
- Average humidity in April: 73%
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 April
Port Jefferson, NY
- Average rainfall in April: 2.83"
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 April
Port Jefferson, 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 least rainy days is January (6.8 days).
Average snowfall in April
Port Jefferson, NY
- Average snowfall in April: 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 April
Port Jefferson, NY
- Average snowfall days in April: 0.2 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 April
Port Jefferson, 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
Port Jefferson, NY
- Average daylight in April: 13h and 2min
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 April: 8h and 2min
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 April
Port Jefferson, NY
- Average sunshine days in April: 15.2 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 April
Port Jefferson, NY
- Average UV index in April: 3
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 April
Port Jefferson, NY
- Average cloud cover in April: 44
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 April
Port Jefferson, NY
- Average visibility in April: 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).
Port Jefferson, New York, USA
Weather forecast for your location
2. Allow the app to use your location
