Duluth
Minnesota, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Duluth, MN

A dusk view of bright neon lights in Duluth, Minnesota, and a clear view of the lit Aerial Lift Bridge, and two long piers with lighthouses at the ends
A dusk view of bright neon lights in Duluth, Minnesota, and a clear view of the lit Aerial Lift Bridge, and two long piers with lighthouses at the ends
December, the first month of the winter, in Duluth, is still a freezing cold month, with average temperature ranging between min 7.3°F (-13.7°C) and max 22.3°F (-5.4°C).

Temperature

In December, the average high-temperature decreases, from a cold 35.6°F (2°C) in November, to a subzero cold 22.3°F (-5.4°C). In Duluth, the average low-temperature is 7.3°F (-13.7°C).

Humidity

The most humid month is December, with an average relative humidity of 76.3%.

Rainfall

In December, in Duluth, the rain falls for 10.5 days. Throughout December, 1.2" (30.7mm) of precipitation is accumulated. In Duluth, during the entire year, the rain falls for 131.4 days and collects up to 31" (786.3mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Duluth.

Ocean temperature

In December, the average ocean temperature in Duluth is 37.4°F (3°C). For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

Daylight

December has the shortest days of the year, with an average of 8.6h of daylight.

Sunshine

Months with the least sunshine in Duluth are November and December, with an average of 3.3h of sunshine.

UV index

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Duluth. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
In December, the average maximum UV index of 1 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Duluth?

In December, in Duluth, Minnesota, the average high-temperature is 22.3°F (-5.4°C), and the average low-temperature is 7.3°F (-13.7°C).

What is the most humid month in Duluth?

The most humid month in Duluth is December, with an average relative humidity of 76.3%.

What is the average humidity in December in Duluth?

In December, the average relative humidity in Duluth, Minnesota, is 76.3%.

How much does it rain in Duluth in December?

In Duluth, during December, the rain falls for 10.5 days and regularly aggregates up to 1.2" (30.7mm) of precipitation.

How much does it snow in Duluth in December?

In Duluth, during December, snow falls for 12.8 days and regularly aggregates up to 17.7" (449.6mm) of snow.

How cold is the water in December in Duluth?

In Duluth, the average seawater temperature in December is 37.4°F (3°C). For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

What is the month with the shortest days in Duluth?

With an average of 8.6h of daylight, December has the shortest days of the year in Duluth.

How many hours of daylight does Duluth have in December?

The average length of the day in December in Duluth is 8.6h.

What is the month with the least sunshine in Duluth?

November and December, with an average of 3.3h of sunshine, are months with the least sunshine.

How many hours of sunshine does Duluth have in December?

In December, the average sunshine in Duluth, Minnesota, is 3.3h.

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

Months with the lowest UV index in Duluth, Minnesota, are January, November and December, with an average maximum UV index of 1.

What is the UV index reading in December in Duluth?

In Duluth, Minnesota, the average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in December - Duluth, MN
  • Average high temperature in December: 22.3°F

The warmest month (with the highest average high temperature) is July (76.3°F).
The month with the lowest average high temperature is January (18.9°F).

  • Average low temperature in December: 7.3°F

The month with the highest average low temperature is July (55.4°F).
The coldest month (with the lowest average low temperature) is January (1.5°F).

Average humidity in December - Duluth, MN
  • Average humidity in December: 76.3%

The month with the highest relative humidity is December (76.3%).
The month with the lowest relative humidity is May (62.7%).

Average rainfall in December - Duluth, MN
  • Average rainfall in December: 1.2"

The wettest month (with the highest rainfall) is June (4.2").
The driest month (with the lowest rainfall) is February (0.8").

Average rainfall days in December - Duluth, MN
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is June (12.6 days).
The month with the lowest number of rainy days is February (8.5 days).

Average snowfall in December - Duluth, MN
  • Average snowfall in December: 17.7"

The month with the highest snowfall is January (19.4").
Months with the lowest snowfall are June, July and August (0").

Average snowfall days in December - Duluth, MN
  • Average snowfall days in December: 12.8 days

The month with the highest number of snowfall days is January (12.9 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

Average sea temperature in December - Duluth, MN
  • Average sea temperature in December: 37°F

The best month for swimming (with the highest average sea temperature) is August (61°F).
Coldest months (with the lowest average sea temperature) are January, February, March and April (36°F).

Average daylight in December / Average sunshine in December - Duluth, MN
  • Average daylight in December: 8.6h

The month with the longest days is June (Average daylight: 15.8h).
The month with shortest days is December (Average daylight: 8.6h).

  • Average sunshine in December: 3.3h

The month with most sunshine is July (Average sunshine: 9.9h).
Months with least sunshine are November and December (Average sunshine: 3.3).

Average UV index in December - Duluth, MN
  • Average UV index in December: 1

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