Hartford
Connecticut, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Hartford, CT

Skyscape view of the city of Hartford, Connecticut, with the roads leading to the town, and trees on roadsides
Skyscape view of the city of Hartford, Connecticut, with the roads leading to the town, and trees on roadsides
December, the first month of the winter, in Hartford, is also a wintry month, with average temperature varying between 23.4°F (-4.8°C) and 39.7°F (4.3°C).

Temperature

In Hartford, the average high-temperature drops, from a cool 51.6°F (10.9°C) in November, to a cold 39.7°F (4.3°C). In Hartford, in December, the average low-temperature is 23.4°F (-4.8°C).

Humidity

The average relative humidity in December is 68%.

Rainfall

In Hartford, during December, the rain falls for 10.7 days and regularly aggregates up to 3.4" (87.4mm) of precipitation. Throughout the year, in Hartford, Connecticut, there are 130 rainfall days, and 45.9" (1164.6mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. In Hartford, Connecticut, during December, snow falls for 4.7 days and regularly aggregates up to 7.4" (188mm) of snow. Throughout the year, in Hartford, Connecticut, there are 20.1 snowfall days, and 40.5" (1028.8mm) of snow is accumulated.

Daylight

With an average of 9.2h of daylight, December has the shortest days of the year in Hartford, Connecticut.

Sunshine

December has the least sunshine of the year in Hartford, Connecticut, with an average of 4.5h of sunshine.

UV index

Months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 1 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 solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Hartford?

In Hartford, in December, the average high-temperature is 39.7°F (4.3°C), and the average low-temperature is 23.4°F (-4.8°C).

What is the average humidity in December in Hartford?

In December, the average relative humidity is 68%.

How many days does it rain in December in Hartford?

In December, in Hartford, the rain falls for 10.7 days. Throughout December, 3.4" (87.4mm) of precipitation is accumulated.

How many days does it snow in December in Hartford?

In Hartford, Connecticut, in December, during 4.7 snowfall days, 7.4" (188mm) of snow is typically accumulated.

What is the month with the shortest days in Hartford?

With an average of 9.2h of daylight, December has the shortest days of the year in Hartford.

How many hours of daylight does Hartford have in December?

In December, the average length of the day in Hartford, Connecticut, is 9.2h.

What is the month with the least sunshine in Hartford?

December has the least sunshine of the year in Hartford, with an average of 4.5h of sunshine.

How many hours of sunshine does Hartford have in December?

The average sunshine in December in Hartford is 4.5h.

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

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Hartford.

What is the UV index intensity in December in Hartford?

The average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the UV radiation.
Average temperature in December - Hartford, CT
  • Average high temperature in December: 39.7°F

The warmest month (with the highest average high temperature) is July (84.5°F).
The month with the lowest average high temperature is January (34.5°F).

  • Average low temperature in December: 23.4°F

The month with the highest average low temperature is July (62.7°F).
The coldest month (with the lowest average low temperature) is January (17.7°F).

Average humidity in December - Hartford, CT
  • Average humidity in December: 68%

The month with the highest relative humidity is September (72.9%).
The month with the lowest relative humidity is April (58%).

Average rainfall in December - Hartford, CT
  • Average rainfall in December: 3.4"

Wettest months (with the highest rainfall) are May, June and October (4.4").
The driest month (with the lowest rainfall) is February (2.9").

Average rainfall days in December - Hartford, CT
  • Average rainfall days in December: 10.7 days

The month with the highest number of rainy days is May (12.8 days).
The month with the lowest number of rainy days is February (9.7 days).

Average snowfall in December - Hartford, CT
  • Average snowfall in December: 7.4"

The month with the highest snowfall is January (12.3").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average snowfall days in December - Hartford, CT
  • Average snowfall days in December: 4.7 days

The month with the highest number of snowfall days is January (5.8 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average daylight in December / Average sunshine in December - Hartford, CT
  • Average daylight in December: 9.2h

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.2h).

  • Average sunshine in December: 4.5h

The month with most sunshine is July (Average sunshine: 9.5h).
The month with least sunshine is December (Average sunshine: 4.5h).

Average UV index in December - Hartford, CT
  • Average UV index in December: 1

Months with the highest UV index are June, July and August (UV index 8).
Months with the lowest UV index are January and December (UV index 1).