January weather forecast and climate
West Islip, NY

January, the same as December, is a wintry winter month in West Islip, New York, with average temperature ranging between max 37.9°F (3.3°C) and min 30.4°F (-0.9°C).

Temperature

The coldest month is January, with an average high-temperature of 37.9°F (3.3°C) and an average low-temperature of 30.4°F (-0.9°C).

Humidity

In West Islip, New York, the average relative humidity in January is 72%.

Rainfall

The month with the least rainfall is January when the rain falls for 8.1 days and typically collects 2.2" (56mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall in West Islip. In West Islip, snow falls for 3.8 days, with typically accumulated 1.26" (32mm) of snow. Throughout the year, in West Islip, there are 14.4 snowfall days, and 6.06" (154mm) of snow is accumulated.

Daylight

In January, the average length of the day is 9.7h.

Sunshine

In West Islip, the average sunshine in January is 5.1h.

UV index

Months with the lowest UV index are January through March and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 2 interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the coldest month in West Islip?

January is the coldest month in West Islip, with an average high-temperature of 37.9°F (3.3°C) and an average low-temperature of 30.4°F (-0.9°C).

What is the temperature in January in West Islip?

In West Islip, New York, in January, the average high-temperature is 37.9°F (3.3°C), and the average low-temperature is 30.4°F (-0.9°C).

What is the average humidity in January in West Islip?

In West Islip, the average relative humidity in January is 72%.

How many days does it rain in January in West Islip?

In West Islip, during January, the rain falls for 8.1 days and regularly aggregates up to 2.2" (56mm) of precipitation.

What is the driest month in West Islip?

The month with the least rainfall in West Islip, New York, is January when the rain falls for 8.1 days and typically collects 2.2" (56mm) of precipitation.

How many days does it snow in January in West Islip?

In January, in West Islip, New York, it is snowing for 3.8 days. Throughout January, 1.26" (32mm) of snow is accumulated.

What is the average length of the day in January in West Islip?

In January, the average length of the day is 9.7h.

How long on average sun shines in January in West Islip?

In West Islip, the average sunshine in January is 5.1h.

What are the months with the lowest UV index in West Islip?

January through March and December, with an average maximum UV index of 2, are months with the lowest UV index in West Islip, New York.

What is the UV index reading in January in West Islip?

In January, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV rays.
Average temperature in January - West Islip, NY
  • Average high temperature in January: 37.9°F

The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in January: 30.4°F

Months with the highest average low temperature are July and August (72°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).

Average pressure in January - West Islip, NY
  • Average pressure in January: 30.05"

The month with the highest atmospheric pressure is November (30.09").
The month with the lowest atmospheric pressure is June (29.93").

Average wind speed in January - West Islip, NY
  • Average wind speed in January: 13.6mph

The windiest month (with the highest average wind speed) is January (13.6mph).
The calmest month (with the lowest average wind speed) is July (8.9mph).

Average humidity in January - West Islip, NY
  • Average humidity in January: 72%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is November (71%).

Average rainfall in January - West Islip, NY
  • Average rainfall in January: 2.2"

The wettest month (with the highest rainfall) is July (3.98").
The driest month (with the least rainfall) is January (2.2").

Average rainfall days in January - West Islip, NY
  • Average rainfall days in January: 8.1 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (8.1 days).

Average snowfall in January - West Islip, NY
  • Average snowfall in January: 1.26"

The month with the highest snowfall is March (2.17").
Months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in January - West Islip, NY
  • Average snowfall days in January: 3.8 days

The month with the highest number of snowfall days is February (4.2 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in January / Average sunshine in January - West Islip, NY
  • Average daylight in January: 9.7h

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

  • Average sunshine in January: 5.1h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 4.8h).

Average sunshine days in January - West Islip, NY
  • Average sunshine days in January: 18.5 days

The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is July (11.4 days).

Average UV index in January - West Islip, NY
  • Average UV index in January: 2

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

Average cloud cover in January - West Islip, NY
  • Average cloud cover in January: 44

The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in January - West Islip, NY
  • Average visibility in January: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).