December weather forecast
Conshohocken, PA

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Weather in December

December, the first month of the winter in Conshohocken, is still a cold month, with an average temperature varying between 42.6°F (5.9°C) and 30.9°F (-0.6°C).

Temperature

December's arrival correlates with a reduction in the average high-temperature, down from a cool 51.6°F (10.9°C) in November to an icy 42.6°F (5.9°C). Conshohocken experiences an average nighttime temperature of 30.9°F (-0.6°C) in the month of December.

Humidity

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

Rainfall

In Conshohocken, during December, the rain falls for 8.6 days and regularly aggregates up to 1.22" (31mm) of precipitation. In Conshohocken, during the entire year, the rain falls for 138.2 days and collects up to 15.59" (396mm) of precipitation.

Snowfall

January through March, May and December are months with snowfall. December is the first month it typically snows. Throughout December, in the average 2.6 snowfall days, it receives 0.35" (9mm) of snow. Throughout the year, in Conshohocken, Pennsylvania, there are 15.8 snowfall days, and 2.13" (54mm) 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 7:04 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:45 pm EST.

Sunshine

In December, the average sunshine is 5h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.

Frequently asked questions

How cold is it in December?

In Conshohocken, in December, the average high-temperature is 42.6°F (5.9°C), and the average low-temperature is 30.9°F (-0.6°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in August is computed to be 89.6°F (32°C).

What is the average humidity in December?

The average relative humidity in December is 78%.

How much does it rain in December?

In Conshohocken, in December, during 8.6 rainfall days, 1.22" (31mm) of precipitation is typically accumulated.

When does it start snowing?

December is the first month it typically snows. Throughout December, in the average 2.6 snowfall days, it receives 0.35" (9mm) of snow.

What is the month with the shortest days?

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

How many hours of daylight does Conshohocken have in December?

In Conshohocken, 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 7:04 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:45 pm EST.

How many hours of sunshine does Conshohocken have in December?

In December, the average sunshine duration is 5h.

When is 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.

How high is the UV index in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from exposure to Sun's UV rays.
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
Conshohocken, PA

Average temperature in December - Conshohocken, PA
  • Average high temperature in December: 42.6°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (36.7°F).

  • Average low temperature in December: 30.9°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in December
Conshohocken, PA

Average pressure in December - Conshohocken, 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 (29.94"Hg).

Average wind speed in December
Conshohocken, PA

Average wind speed in December - Conshohocken, PA
  • Average wind speed in December: 7.5mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

Average humidity in December
Conshohocken, PA

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

The months with the highest relative humidity are February and October (79%).
The months with the lowest relative humidity are April and July (72%).

Average rainfall in December
Conshohocken, PA

Average rainfall in December - Conshohocken, PA
  • Average rainfall in December: 1.22"

The wettest month (with the highest rainfall) is July (1.89").
The driest month (with the least rainfall) is February (0.91").

Average rainfall days in December
Conshohocken, PA

Average rainfall days in December - Conshohocken, PA
  • Average rainfall days in December: 8.6 days

The month with the highest number of rainy days is May (16 days).
The month with the least rainy days is November (7.4 days).

Average snowfall in December
Conshohocken, PA

Average snowfall in December - Conshohocken, PA
  • Average snowfall in December: 0.35"

The months with the highest snowfall are February and March (0.55").
The months with the least snowfall are April, June, July, August, September, October and November (0").

Average snowfall days in December
Conshohocken, PA

Average snowfall days in December - Conshohocken, PA
  • Average snowfall days in December: 2.6 days

The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are April, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Conshohocken, 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 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in December
Conshohocken, PA

Average sunshine days in December - Conshohocken, PA
  • Average sunshine days in December: 19.9 days

The month with the most sunshine days is November (20.5 days).
The months with the least sunshine days are May and June (12.8 days).

Average UV index in December
Conshohocken, PA

Average UV index in December - Conshohocken, 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
Conshohocken, PA

Average cloud cover in December - Conshohocken, PA
  • Average cloud cover in December: 47

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

Average visibility in December
Conshohocken, PA

Average visibility in December - Conshohocken, 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).

Conshohocken, Pennsylvania, USA

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