December weather forecast and climate
Hewlett, NY

The first month of the winter, December, is still a chilly month in Hewlett, New York, with average temperature fluctuating between 36°F (2.2°C) and 43.5°F (6.4°C).

Temperature

In December, the average high-temperature slightly decreases, from a cool 51.6°F (10.9°C) in November, to a chilly 43.5°F (6.4°C). In December, in Hewlett, the average low-temperature is 36°F (2.2°C).

Humidity

In Hewlett, the average relative humidity in December is 75%.

Rainfall

In December, in Hewlett, New York, the rain falls for 10.7 days. Throughout December, 1.65" (42mm) of precipitation is accumulated. Throughout the year, there are 135.3 rainfall days, and 18.62" (473mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Hewlett are January through March, October through December. In Hewlett, during December, snow falls for 2.8 days and regularly aggregates up to 0.59" (15mm) of snow. In Hewlett, during the entire year, snow falls for 15.8 days, and aggregates up to 2.95" (75mm) of snow.

Daylight

With an average of 9.3h of daylight, December has the shortest days of the year in Hewlett.

Sunshine

In Hewlett, the average sunshine is 5h.

UV index

Months with the lowest UV index in Hewlett, New York, are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 December in Hewlett?

In Hewlett, in December, the average high-temperature is 43.5°F (6.4°C), and the average low-temperature is 36°F (2.2°C).

What is the average humidity in December in Hewlett?

In Hewlett, the average relative humidity in December is 75%.

How many days does it rain in December in Hewlett?

In Hewlett, New York, in December, it is raining for 10.7 days, with typically 1.65" (42mm) of accumulated precipitation.

How many days does it snow in December in Hewlett?

In Hewlett, New York, in December, snow falls for 2.8 days, with typically accumulated 0.59" (15mm) of snow.

What is the month with the shortest days in Hewlett?

With an average of 9.3h of daylight, December has the shortest days of the year in Hewlett.

How many hours of daylight does Hewlett have in December?

In December, the average length of the day in Hewlett, New York, is 9.3h.

How long on average sun shines in December in Hewlett?

The average sunshine in December in Hewlett is 5h.

When is the lowest UV index in Hewlett?

Months with the lowest UV index in Hewlett, New York, are January through March, November and December, with an average maximum UV index of 2.

What is the UV index reading in December in Hewlett?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV rays.
Average temperature in December - Hewlett, NY
  • Average high temperature in December: 6.4°C

The warmest month (with the highest average high temperature) is July (27°C).
The month with the lowest average high temperature is January (2.8°C).

  • Average low temperature in December: 2.2°C

The month with the highest average low temperature is August (21.7°C).
The coldest month (with the lowest average low temperature) is January (-2.1°C).

Average pressure in December - Hewlett, NY
  • Average pressure in December: 1018.3mbar

The month with the highest atmospheric pressure is November (1019.3mbar).
The month with the lowest atmospheric pressure is June (1013.6mbar).

Average wind speed in December - Hewlett, NY
  • Average wind speed in December: 19.1km/h

The windiest month (with the highest average wind speed) is January (19.9km/h).
The calmest month (with the lowest average wind speed) is July (12.9km/h).

Average humidity in December - Hewlett, NY
  • Average humidity in December: 75%

The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is November (72%).

Average rainfall in December - Hewlett, NY
  • Average rainfall in December: 42mm

The wettest months (with the highest rainfall) are July and August (59mm).
The driest month (with the least rainfall) is January (23mm).

Average rainfall days in December - Hewlett, NY
  • Average rainfall days in December: 10.7 days

The month with the highest number of rainy days is July (15.1 days).
The month with the least rainy days is January (7.3 days).

Average snowfall in December - Hewlett, NY
  • Average snowfall in December: 15mm

The month with the highest snowfall is March (26mm).
Months with the least snowfall are April, May, June, July, August and September (0mm).

Average snowfall days in December - Hewlett, NY
  • Average snowfall days in December: 2.8 days

The month with the highest number of snowfall days is January (4.6 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December / Average sunshine in December - Hewlett, NY
  • Average daylight in December: 9.3h

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 December: 5h

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 December - Hewlett, NY
  • Average sunshine days in December: 16.9 days

The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is July (13.6 days).

Average UV index in December - Hewlett, NY
  • Average UV index in December: 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, November and December (UV index 2).

Average cloud cover in December - Hewlett, NY
  • Average cloud cover in December: 47

Months with the most cloud cover are February and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in December - Hewlett, NY
  • Average visibility in December: 9km

Months with the highest visibility are April, June, July, August, September, October and November (10km).
Months with the lowest visibility are January, February, March, May and December (9km).