December weather forecast
Chatwood, PA

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Weather in December

The first month of the winter, December, is also a frosty month in Chatwood, Pennsylvania, with an average temperature varying between 42.8°F (6°C) and 31.3°F (-0.4°C).

Temperature

Welcoming December, Chatwood observes a shift in the average high-temperature, falling from November's fresh 52°F (11.1°C) to a frosty 42.8°F (6°C). In December, Chatwood encounters an average low-temperature of 31.3°F (-0.4°C) during the night.

Humidity

In Chatwood, the average relative humidity in December is 78%.

Rainfall

In Chatwood, in December, it is raining for 8.3 days, with typically 1.18" (30mm) of accumulated precipitation. In Chatwood, during the entire year, the rain falls for 128.5 days and collects up to 14.92" (379mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. In December, it is snowing for 2.5 days. Throughout December, 0.59" (15mm) of snow is accumulated. In Chatwood, during the entire year, snow falls for 18.1 days and aggregates up to 5.43" (138mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:37 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:47 pm EST.

Sunshine

In Chatwood, Pennsylvania, the average sunshine in December is 4.8h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index, 2 during December, leads to the following recommendations:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.

Frequently asked questions

How cold is December?

In Chatwood, 42.8°F (6°C) is the average high-temperature and 31.3°F (-0.4°C) is the average low-temperature during December. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in August is estimated at 87.8°F (31°C).

What is the average humidity in December?

In Chatwood, the average relative humidity in December is 78%.

How many days does it rain in December?

In Chatwood, during December, the rain falls for 8.3 days and regularly aggregates up to 1.18" (30mm) of precipitation.

How much does it snow in December?

In Chatwood, in December, during 2.5 snowfall days, 0.59" (15mm) of snow is typically accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

How many hours of daylight does Chatwood have in December?

In Chatwood, the average day length in December is 9h and 23min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:05 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:47 pm EST.

How long on average sun shines in December?

In Chatwood, the average sunshine duration in December is 4.8h.

What is the month with the lowest UV index?

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

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Chatwood, PA

Average temperature in December - Chatwood, PA
  • Average high temperature in December: 42.8°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (36.5°F).

  • Average low temperature in December: 31.3°F

The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (24.4°F).

Average pressure in December
Chatwood, PA

Average pressure in December - Chatwood, PA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Chatwood, PA

Average wind speed in December - Chatwood, PA
  • Average wind speed in December: 8mph

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in December
Chatwood, PA

Average humidity in December - Chatwood, PA
  • Average humidity in December: 78%

The months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (73%).

Average rainfall in December
Chatwood, PA

Average rainfall in December - Chatwood, PA
  • Average rainfall in December: 1.18"

The wettest month (with the highest rainfall) is August (2.01").
The driest month (with the least rainfall) is January (0.83").

Average rainfall days in December
Chatwood, PA

Average rainfall days in December - Chatwood, PA
  • Average rainfall days in December: 8.3 days

The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is January (5.7 days).

Average snowfall in December
Chatwood, PA

Average snowfall in December - Chatwood, PA
  • Average snowfall in December: 0.59"

The month with the highest snowfall is March (1.54").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Chatwood, PA

Average snowfall days in December - Chatwood, PA
  • Average snowfall days in December: 2.5 days

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

Average daylight in December /
Average sunshine in December
Chatwood, PA

Average daylight in December / Average sunshine in December - Chatwood, PA
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 4h and 5min

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 36min).

Average sunshine days in December
Chatwood, PA

Average sunshine days in December - Chatwood, PA
  • Average sunshine days in December: 20.5 days

The month with the most sunshine days is November (21.7 days).
The month with the least sunshine days is August (13.1 days).

Average UV index in December
Chatwood, PA

Average UV index in December - Chatwood, PA
  • Average UV index in December: 2

The months with the highest UV index are May, 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 December
Chatwood, PA

Average cloud cover in December - Chatwood, PA
  • Average cloud cover in December: 48

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Chatwood, PA

Average visibility in December - Chatwood, PA
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).

Chatwood, Pennsylvania, USA

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