December weather forecast and climate
Monroeville, NJ

The first month of the winter, December, is still a chilly month in Monroeville, New Jersey, with average temperature fluctuating between 32.9°F (0.5°C) and 44.2°F (6.8°C).

Temperature

In December, the average high-temperature drops, from a fresh 53.4°F (11.9°C) in November, to a frosty 44.2°F (6.8°C). The average low-temperature, in Monroeville, is 32.9°F (0.5°C).

Humidity

The average relative humidity in Monroeville is 77%.

Rainfall

The month with the most rainfall in Monroeville is December when the rain falls for 11 days and typically aggregates up to 3.35" (85mm) of precipitation.

Snowfall

Months with snowfall in Monroeville are January through May, November and December. In Monroeville, during 3 snowfall days, 1.26" (32mm) of snow is typically accumulated. Throughout the year, there are 17.8 snowfall days, and 10.28" (261mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9.4h of daylight.

Sunshine

The average sunshine in December is 5.2h.

UV index

Months with the lowest UV index in Monroeville are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Monroeville?

The average high-temperature, in December, in Monroeville, New Jersey, is 44.2°F (6.8°C), while the average low-temperature is 32.9°F (0.5°C).

What is the average humidity in December in Monroeville?

In December, the average relative humidity in Monroeville is 77%.

How much does it rain in Monroeville in December?

In Monroeville, in December, it is raining for 11 days, with typically 3.35" (85mm) of accumulated precipitation.

What is the wettest month in Monroeville?

December is the month with the most rainfall in Monroeville. Rain falls for 11 days and accumulates 3.35" (85mm) of precipitation.

How many days does it snow in December in Monroeville?

In December, in Monroeville, New Jersey, it is snowing for 3 days. Throughout December, 1.26" (32mm) of snow is accumulated.

What is the month with the shortest days in Monroeville?

December has the shortest days of the year in Monroeville, with an average of 9.4h of daylight.

What is the average length of the day in December in Monroeville?

The average length of the day in December in Monroeville, New Jersey, is 9.4h.

How long on average sun shines in December in Monroeville?

In December, the average sunshine is 5.2h.

What are the months with the lowest UV index in Monroeville?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Monroeville.

How high is the UV index in December in Monroeville?

In December, the average daily maximum UV index in Monroeville, New Jersey, 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 December - Monroeville, NJ
  • Average high temperature in December: 6.8°C

The warmest month (with the highest average high temperature) is July (29.6°C).
The month with the lowest average high temperature is January (3.4°C).

  • Average low temperature in December: 0.5°C

The month with the highest average low temperature is July (20.3°C).
The coldest month (with the lowest average low temperature) is January (-2.9°C).

Average pressure in December - Monroeville, NJ
  • Average pressure in December: 1019.1mbar

The month with the highest atmospheric pressure is November (1020mbar).
The month with the lowest atmospheric pressure is June (1013.8mbar).

Average wind speed in December - Monroeville, NJ
  • Average wind speed in December: 12.5km/h

The windiest month (with the highest average wind speed) is April (14km/h).
The calmest month (with the lowest average wind speed) is August (9.1km/h).

Average humidity in December - Monroeville, NJ
  • Average humidity in December: 77%

The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (71%).

Average rainfall in December - Monroeville, NJ
  • Average rainfall in December: 85mm

The wettest month (with the highest rainfall) is December (85mm).
The driest month (with the least rainfall) is September (44mm).

Average rainfall days in December - Monroeville, NJ
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is July (16.9 days).
The month with the least rainy days is January (8.8 days).

Average snowfall in December - Monroeville, NJ
  • Average snowfall in December: 32mm

The month with the highest snowfall is March (90mm).
Months with the least snowfall are June, July, August, September and October (0mm).

Average snowfall days in December - Monroeville, NJ
  • Average snowfall days in December: 3 days

The month with the highest number of snowfall days is January (5.5 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in December / Average sunshine in December - Monroeville, NJ
  • Average daylight in December: 9.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in December: 5.2h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 4.9h).

Average sunshine days in December - Monroeville, NJ
  • Average sunshine days in December: 17.9 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.8 days).

Average UV index in December - Monroeville, NJ
  • Average UV index in December: 2

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

Average cloud cover in December - Monroeville, NJ
  • Average cloud cover in December: 45

Months with the most cloud cover are February and March (Cloud cover 46).
Months with the least cloud cover are July and August (Cloud cover 30).

Average visibility in December - Monroeville, NJ
  • Average visibility in December: 9km

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