December weather forecast
Croydon, PA

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Weather in December

The first month of the winter, December, is still a chilly month in Croydon, Pennsylvania, with an average temperature fluctuating between 44.2°F (6.8°C) and 32.5°F (0.3°C).

Temperature

During the shift to December, a minor reduction in average high-temperature is observed, shifting from a cool 52.7°F (11.5°C) in November to a frosty 44.2°F (6.8°C). Croydon's average low-temperature for the month of December records at an icy 32.5°F (0.3°C).

Humidity

The months with the highest humidity are February, October and December, with an average relative humidity of 77%.

Rainfall

December is the month with the most rainfall. Rain falls for 11 days and accumulates 2.99" (76mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. In Croydon, Pennsylvania, during December, snow falls for 3.1 days and regularly aggregates up to 1.18" (30mm) of snow. Throughout the year, there are 19.1 snowfall days, and 8.9" (226mm) of snow is accumulated.

Daylight

With an average of 9h and 24min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:03 am and sunset at 4:34 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:44 pm EST.

Sunshine

The average sunshine in December is 5h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In December, the maximum UV index of 2 translates into these guidelines:
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. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.

Frequently asked questions

How cold is December?

December temperatures vary between a high-temperature of 44.2°F (6.8°C) and a low-temperature of 32.5°F (0.3°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in August is estimated at 91.4°F (33°C).

What is the most humid month?

February, October and December, with an average relative humidity of 77%, are most humid months.

What is the average humidity in December?

The average relative humidity in December is 77%.

What is the wettest month?

The month with the most rainfall is December, when the rain falls for 11 days and typically aggregates up to 2.99" (76mm) of precipitation.

How many days does it rain in December?

In Croydon, in December, it is raining for 11 days, with typically 2.99" (76mm) of accumulated precipitation.

How much does it snow in December?

In Croydon, in December, snow falls for 3.1 days, with typically accumulated 1.18" (30mm) of snow.

What is the month with the shortest days?

With an average of 9h and 24min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

The average day length in December is 9h and 23min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:03 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:44 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 5h.

When is the lowest UV index?

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

What is the UV index reading in December?

In December, the average daily maximum UV index in Croydon is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unprotected exposure to 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
Croydon, PA

Average temperature in December - Croydon, PA
  • Average high temperature in December: 44.2°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in December: 32.5°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (25.5°F).

Average pressure in December
Croydon, PA

Average pressure in December - Croydon, PA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Croydon, PA

Average wind speed in December - Croydon, PA
  • Average wind speed in December: 7.6mph

The windiest months (with the highest average wind speed) are March and April (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

Average humidity in December
Croydon, PA

Average humidity in December - Croydon, PA
  • Average humidity in December: 77%

The months with the highest relative humidity are February, October and December (77%).
The month with the lowest relative humidity is April (71%).

Average rainfall in December
Croydon, PA

Average rainfall in December - Croydon, PA
  • Average rainfall in December: 2.99"

The wettest month (with the highest rainfall) is December (2.99").
The driest month (with the least rainfall) is September (1.57").

Average rainfall days in December
Croydon, PA

Average rainfall days in December - Croydon, PA
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is November (8.8 days).

Average snowfall in December
Croydon, PA

Average snowfall in December - Croydon, PA
  • Average snowfall in December: 1.18"

The month with the highest snowfall is March (2.95").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Croydon, PA

Average snowfall days in December - Croydon, PA
  • Average snowfall days in December: 3.1 days

The month with the highest number of snowfall days is January (6 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
Croydon, PA

Average daylight in December / Average sunshine in December - Croydon, 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: 5h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in December
Croydon, PA

Average sunshine days in December - Croydon, PA
  • Average sunshine days in December: 17.1 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (12.5 days).

Average UV index in December
Croydon, PA

Average UV index in December - Croydon, 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, November and December (UV index 2).

Average cloud cover in December
Croydon, PA

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

The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Croydon, PA

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

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

Croydon, Pennsylvania, USA

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