December weather forecast
Northampton, PA

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Weather in December

The first month of the winter, December, is also a wintry month in Northampton, Pennsylvania, with an average temperature ranging between max 40.1°F (4.5°C) and min 28.9°F (-1.7°C).

Temperature

In December, the meteorological conditions alter, with the average high-temperature shifting from a frosty 49.1°F (9.5°C) in November to an icy 40.1°F (4.5°C). Northampton's average low-temperature during December nights is observed to be a freezing cold 28.9°F (-1.7°C).

Humidity

In Northampton, the average relative humidity in December is 80%.

Rainfall

In Northampton, during December, the rain falls for 12.1 days and regularly aggregates up to 2.87" (73mm) of precipitation. In Northampton, Pennsylvania, during the entire year, the rain falls for 162.5 days and collects up to 31.69" (805mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Northampton, in December, during 5.5 snowfall days, 2.95" (75mm) of snow is typically accumulated. Throughout the year, there are 32.3 snowfall days, and 17.24" (438mm) of snow is accumulated.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:07 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:44 pm EST.

Sunshine

The average sunshine in December is 4.7h.

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 of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.
Note: A typical high UV index of 2 in December suggests the following recommendations:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.

Frequently asked questions

How cold is it in December?

In December, the average high-temperature and low-temperature are 40.1°F (4.5°C) and 28.9°F (-1.7°C) respectively. In August, the average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, is calculated to be 86°F (30°C).

What is the average humidity in December?

In December, the average relative humidity is 80%.

How much does it rain in December?

In Northampton, in December, it is raining for 12.1 days, with typically 2.87" (73mm) of accumulated precipitation.

How much does it snow in December?

In December, it is snowing for 5.5 days. Throughout December, 2.95" (75mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 18min of daylight.

How many hours of daylight does Northampton have in December?

The average day length in December is 9h and 19min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:07 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:44 pm EST.

How long on average sun shines in December?

In Northampton, the average sunshine duration in December is 4.7h.

What are the months 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?

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

Average temperature in December - Northampton, PA
  • Average high temperature in December: 40.1°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in December: 28.9°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in December
Northampton, PA

Average pressure in December - Northampton, 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
Northampton, PA

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

The windiest months (with the highest average wind speed) are January and March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in December
Northampton, PA

Average humidity in December - Northampton, PA
  • Average humidity in December: 80%

The month with the highest relative humidity is February (81%).
The months with the lowest relative humidity are April and July (76%).

Average rainfall in December
Northampton, PA

Average rainfall in December - Northampton, PA
  • Average rainfall in December: 2.87"

The wettest month (with the highest rainfall) is July (3.19").
The driest month (with the least rainfall) is September (1.93").

Average rainfall days in December
Northampton, PA

Average rainfall days in December - Northampton, PA
  • Average rainfall days in December: 12.1 days

The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (9.9 days).

Average snowfall in December
Northampton, PA

Average snowfall in December - Northampton, PA
  • Average snowfall in December: 2.95"

The month with the highest snowfall is March (4.88").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Northampton, PA

Average snowfall days in December - Northampton, PA
  • Average snowfall days in December: 5.5 days

The month with the highest number of snowfall days is February (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Northampton, 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 18min).

  • Average sunshine in December: 4h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in December
Northampton, PA

Average sunshine days in December - Northampton, PA
  • Average sunshine days in December: 15.7 days

The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is February (11.7 days).

Average UV index in December
Northampton, PA

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

The months with the highest UV index are June and July (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
Northampton, PA

Average cloud cover in December - Northampton, PA
  • Average cloud cover in December: 51

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in December
Northampton, PA

Average visibility in December - Northampton, PA
  • Average visibility in December: 5mi

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

Northampton, Pennsylvania, USA

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