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

January 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
January, the same as December, in Duluth, Minnesota, is a freezing cold winter month, with average temperature varying between 18.9°F (-7.3°C) and 1.6°F (-16.9°C).

Temperature

The coldest month is January, with an average high-temperature of 18.9°F (-7.3°C) and an average low-temperature of 1.6°F (-16.9°C).

Humidity

The average relative humidity in Duluth, Minnesota, is 72%.

Rainfall

In Duluth, during January, the rain falls for 10.3 days and regularly aggregates up to 1" (24.4mm) of precipitation. Throughout the year, in Duluth, there are 131.4 rainfall days, and 31" (786.3mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall in Duluth. January is the month with the most snowfall. Snow falls for 12.9 days and accumulates 19.4" (492.8mm) of snow.

Ocean temperature

Months with the coldest seawater are January through April, with an average ocean temperature of 35.6°F (2°C). For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

Daylight

The average length of the day in January is 9.1h.

Sunshine

The average sunshine in Duluth is 4.3h.

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 reading of 2, and below, represents a low threat to health from the exposure to the Sun's UV radiation for average individuals.
In January, the average maximum UV index of 1 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the coldest month in Duluth?

With an average high-temperature of 18.9°F (-7.3°C) and an average low-temperature of 1.6°F (-16.9°C), January is the coldest month.

What is the temperature in January in Duluth?

In January, in Duluth, the average high-temperature is 18.9°F (-7.3°C), and the average low-temperature is 1.6°F (-16.9°C).

What is the average humidity in January in Duluth?

In January, the average relative humidity in Duluth is 72%.

How many days does it rain in January in Duluth?

In Duluth, in January, it is raining for 10.3 days, with typically 1" (24.4mm) of accumulated precipitation.

How many days does it snow in January in Duluth?

In Duluth, Minnesota, in January, during 12.9 snowfall days, 19.4" (492.8mm) of snow is typically accumulated.

When does it snow the most in Duluth?

The month with the most snowfall in Duluth, Minnesota, is January when snow falls for 12.9 days and typically aggregates up to 19.4" (492.8mm) of snow.

What months are the ocean coldest in Duluth?

Through and April, with an average ocean temperature of 35.6°F (2°C). For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

How cold is the water in January in Duluth?

In Duluth, Minnesota, the average seawater temperature in January is 35.6°F (2°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 average length of the day in January in Duluth?

In January, the average length of the day in Duluth, Minnesota, is 9.1h.

How long on average sun shines in January in Duluth?

In January, the average sunshine in Duluth is 4.3h.

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

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

What is the UV index intensity in January in Duluth?

In January, the average daily maximum UV index in Duluth is 1. A UV Index of 2, and less, symbolizes a low health threat from unprotected exposure to the UV radiation.
Average temperature in January - Duluth, MN
  • Average high temperature in January: 18.9°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 January: 1.5°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 January - Duluth, MN
  • Average humidity in January: 72%

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 January - Duluth, MN
  • Average rainfall in January: 1"

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 January - Duluth, MN
  • Average rainfall days in January: 10.3 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 January - Duluth, MN
  • Average snowfall in January: 19.4"

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 January - Duluth, MN
  • Average snowfall days in January: 12.9 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 January - Duluth, MN
  • Average sea temperature in January: 36°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 January / Average sunshine in January - Duluth, MN
  • Average daylight in January: 9.1h

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 January: 4.3h

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 January - Duluth, MN
  • Average UV index in January: 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).