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
The first month of the winter, December, is also a wintry month in Hartford, Connecticut, with temperature in the range of an average low of 27.7°F (-2.4°C) and an average high of 38.5°F (3.6°C).

Temperature

In December, the average high-temperature drops, from a chilly 48.9°F (9.4°C) in November, to a wintry 38.5°F (3.6°C). In Hartford, Connecticut, in December, the average low-temperature is 27.7°F (-2.4°C).

Humidity

The average relative humidity in Hartford is 78%.

Rainfall

In December, the rain falls for 7.6 days. Throughout December, 0.94" (24mm) of precipitation is accumulated. In Hartford, Connecticut, during the entire year, the rain falls for 113.2 days and collects up to 10.24" (260mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall in Hartford. In Hartford, in December, snow falls for 3.5 days, with typically accumulated 0.79" (20mm) of snow. Throughout the year, in Hartford, there are 21.5 snowfall days, and 4.45" (113mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9.2h of daylight.

Sunshine

In Hartford, the average sunshine is 4.8h.

UV index

Months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Hartford?

The average high-temperature, in December, is 38.5°F (3.6°C), while the average low-temperature is 27.7°F (-2.4°C).

What is the average humidity in December in Hartford?

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

How many days does it rain in December in Hartford?

In Hartford, in December, it is raining for 7.6 days, with typically 0.94" (24mm) of accumulated precipitation.

How many days does it snow in December in Hartford?

In Hartford, Connecticut, in December, during 3.5 snowfall days, 0.79" (20mm) of snow is typically accumulated.

What is the month with the shortest days in Hartford?

The month with the shortest days in Hartford is December, with an average of 9.2h of daylight.

What is the average length of the day in December in Hartford?

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

How many hours of sunshine does Hartford have in December?

The average sunshine in December in Hartford, Connecticut, is 4.8h.

What is the month with the lowest UV index in Hartford?

Months with the lowest UV index in Hartford, Connecticut, are January through March, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Hartford?

In December, the average daily maximum UV index in Hartford is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to the UV radiation.
Average temperature in December - Hartford, CT
  • Average high temperature in December: 3.6°C

The warmest month (with the highest average high temperature) is July (28.3°C).
The month with the lowest average high temperature is January (0.6°C).

  • Average low temperature in December: -2.4°C

The month with the highest average low temperature is July (17.6°C).
The coldest month (with the lowest average low temperature) is January (-5.9°C).

Average humidity in December - Hartford, CT
  • Average humidity in December: 78%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (70%).

Average rainfall in December - Hartford, CT
  • Average rainfall in December: 24mm

Wettest months (with the highest rainfall) are June and July (27mm).
The driest month (with the lowest rainfall) is September (11mm).

Average rainfall days in December - Hartford, CT
  • Average rainfall days in December: 7.6 days

The month with the highest number of rainy days is July (11.8 days).
The month with the lowest number of rainy days is February (6.8 days).

Average snowfall in December - Hartford, CT
  • Average snowfall in December: 20mm

The month with the highest snowfall is February (29mm).
Months with the lowest snowfall are June, July, August, September and October (0mm).

Average snowfall days in December - Hartford, CT
  • Average snowfall days in December: 3.5 days

The month with the highest number of snowfall days is February (5.7 days).
Months with the lowest number of snowfall days are June, July, August and September (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: 4.8h

Months with most sunshine are July and August (Average sunshine: 10.4h).
The month with least sunshine is February (Average sunshine: 4.6h).

Average UV index in December - Hartford, CT
  • Average UV index in December: 2

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).