December weather forecast and climate
Port Jervis, NY

December, the first month of the winter, in Port Jervis, is still a cold month, with average temperature ranging between max 37.6°F (3.1°C) and min 26.1°F (-3.3°C).

Temperature

In December, the average high-temperature decreases, from a frosty 47.8°F (8.8°C) in November, to a cold 37.6°F (3.1°C). In Port Jervis, the average low-temperature is 26.1°F (-3.3°C).

Humidity

February and December, with an average relative humidity of 83%, are most humid months in Port Jervis.

Rainfall

In Port Jervis, during December, the rain falls for 11.5 days and regularly aggregates up to 1.34" (34mm) of precipitation. Throughout the year, in Port Jervis, there are 150.5 rainfall days, and 19.37" (492mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Port Jervis, during December, snow falls for 6.6 days and regularly aggregates up to 1.34" (34mm) of snow. In Port Jervis, during the entire year, snow falls for 36.1 days, and aggregates up to 9.8" (249mm) of snow.

Daylight

December has the shortest days of the year in Port Jervis, with an average of 9.2h of daylight.

Sunshine

The average sunshine in Port Jervis is 4.6h.

UV index

Months with the lowest UV index in Port Jervis, New York, are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 2 in December transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Port Jervis?

In December, the average high-temperature is 37.6°F (3.1°C), and the average low-temperature is 26.1°F (-3.3°C).

What is the most humid month in Port Jervis?

Months with the highest humidity in Port Jervis are February and December, with an average relative humidity of 83%.

What is the average humidity in December in Port Jervis?

In Port Jervis, New York, the average relative humidity in December is 83%.

How many days does it rain in December in Port Jervis?

In December, in Port Jervis, New York, the rain falls for 11.5 days. Throughout December, 1.34" (34mm) of precipitation is accumulated.

How much does it snow in Port Jervis in December?

In Port Jervis, in December, snow falls for 6.6 days, with typically accumulated 1.34" (34mm) of snow.

What is the month with the shortest days in Port Jervis?

With an average of 9.2h of daylight, December has the shortest days of the year.

How many hours of daylight does Port Jervis have in December?

The average length of the day in December is 9.2h.

How long on average sun shines in December in Port Jervis?

In Port Jervis, the average sunshine in December is 4.6h.

When is the lowest UV index in Port Jervis?

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

What is the UV index reading in December in Port Jervis?

In Port Jervis, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV rays.
Average temperature in December - Port Jervis, NY
  • Average high temperature in December: 3.1°C

The warmest month (with the highest average high temperature) is July (28.1°C).
The month with the lowest average high temperature is January (0°C).

  • Average low temperature in December: -3.3°C

The month with the highest average low temperature is July (15.7°C).
The coldest month (with the lowest average low temperature) is January (-7.3°C).

Average pressure in December - Port Jervis, NY
  • Average pressure in December: 1018.5mbar

The month with the highest atmospheric pressure is November (1019.6mbar).
The month with the lowest atmospheric pressure is June (1013.7mbar).

Average wind speed in December - Port Jervis, NY
  • Average wind speed in December: 11.2km/h

The windiest month (with the highest average wind speed) is March (12.2km/h).
The calmest month (with the lowest average wind speed) is August (7.8km/h).

Average humidity in December - Port Jervis, NY
  • Average humidity in December: 83%

Months with the highest relative humidity are February and December (83%).
Months with the lowest relative humidity are April and July (77%).

Average rainfall in December - Port Jervis, NY
  • Average rainfall in December: 34mm

The wettest month (with the highest rainfall) is May (60mm).
The driest month (with the least rainfall) is January (26mm).

Average rainfall days in December - Port Jervis, NY
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is May (16.7 days).
Months with the least rainy days are January and February (8.6 days).

Average snowfall in December - Port Jervis, NY
  • Average snowfall in December: 34mm

The month with the highest snowfall is February (78mm).
Months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in December - Port Jervis, NY
  • Average snowfall days in December: 6.6 days

The month with the highest number of snowfall days is February (10 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December / Average sunshine in December - Port Jervis, NY
  • Average daylight in December: 9.2h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in December: 4.6h

The month with the most sunshine is July (Average sunshine: 10.2h).
The month with the least sunshine is February (Average sunshine: 4.2h).

Average sunshine days in December - Port Jervis, NY
  • Average sunshine days in December: 16.1 days

The month with the most sunshine days is October (17.4 days).
Months with the least sunshine days are April and May (11.8 days).

Average UV index in December - Port Jervis, NY
  • Average UV index in December: 2

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

Average cloud cover in December - Port Jervis, NY
  • Average cloud cover in December: 52

The month with the most cloud cover is February (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 36).

Average visibility in December - Port Jervis, NY
  • Average visibility in December: 8km

Months with the highest visibility are January, February, March, April, May, June, July, August, October, November and December (8km).
The month with the lowest visibility is September (7km).