January weather - Winter 2025

Weather in January
Frequently asked questions
Average temperature in January
Average pressure in January
Average wind speed in January
Average humidity in January
Average rainfall in January
Average rainfall days in January
Average snowfall in January
Average snowfall days in January
Average daylight in January
Average sunshine in January
Average sunshine days in January
Average UV index in January
Average cloud cover in January
Average visibility in January

The vast University of Michigan Law School Campus in Ann Arbor, Michigan

Weather in January

The weather in Ann Arbor, Michigan, is characteristic of a typical Midwest winter, as the city enters the new year. January's temperatures often plummet, presenting chilly conditions during the month with frequent snowfalls. As the days remain short and with minimal sunshine hours, residents often experience cold, frosty mornings and evenings. Despite this, wind speeds tend to moderate during this time, providing a slight relief to people from chilly conditions. An interesting attribute is the relative humidity of 86%, which is tied for the high in the year alongside February, intervening to intensify the biting cold.

Temperature

In Ann Arbor, January is the month with the lowest recorded average temperatures, measuring a high of 28.2°F (-2.1°C) and a low of 17.8°F (-7.9°C).

Humidity

January and February, with an average relative humidity of 86%, are the most humid months.

Rainfall

In Ann Arbor, during January, the rain falls for 5.2 days and regularly aggregates up to 0.91" (23mm) of precipitation. In Ann Arbor, during the entire year, the rain falls for 144.9 days and collects up to 18.82" (478mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Ann Arbor. In Ann Arbor, in January, snow falls for 11.5 days, with typically accumulated 2.48" (63mm) of snow. Throughout the year, in Ann Arbor, there are 45 snowfall days, and 9.69" (246mm) of snow is accumulated.

Daylight

In January, the average length of the day is 9h and 31min.
On the first day of January, sunrise is at 8:03 am and sunset at 5:13 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 5:47 pm EST.

Sunshine

With an average of 3h of sunshine, January has the least sunshine of the year.

UV index

In Ann Arbor, the average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: In January, the maximum UV index of 2 suggests these 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. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.

Updated: Jul 14, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the coldest?

In Ann Arbor, the average lowest temperatures are observed in January, with a high of 28.2°F (-2.1°C) and a low of 17.8°F (-7.9°C).

How cold is January?

The average high-temperature and low-temperature during January are 28.2°F (-2.1°C) and 17.8°F (-7.9°C) respectively.

What is the most humid month?

The months with the highest humidity are January and February, with an average relative humidity of 86%.

What is the average humidity in January?

The average relative humidity in January is 86%.

How much does it rain in January?

In Ann Arbor, in January, it is raining for 5.2 days, with typically 0.91" (23mm) of accumulated precipitation.

How much does it snow in January?

In Ann Arbor, during January, snow falls for 11.5 days and regularly aggregates up to 2.48" (63mm) of snow.

What is the average length of the day in January?

In January, the average day length is 9h and 31min.

When are sunrise and sunset in January?

On the first day of January, sunrise is at 8:03 am and sunset at 5:13 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 5:47 pm EST.

What is the month with the least sunshine?

With an average of 3h of sunshine, January has the least sunshine of the year.

How many hours of sunshine does Ann Arbor have in January?

The average sunshine duration in January is 3h.

How high is the UV index in January in Ann Arbor?

In January, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

34.7°F 1.5°C

28.2°F -2.1°C

31.5°F -0.3°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

10.3mph 16.6km/h

10.7mph 17.2km/h

10.6mph 17.1km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

16.6

13.6

Average UV index

Average cloud cover

Average visibility

Average temperature in January
Ann Arbor, MI

Average high temperature in January: 28.2°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (28.2°F).

Average low temperature in January: 17.8°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).

Average pressure in January
Ann Arbor, MI

Average pressure in January: 30.08"Hg

The months with the highest atmospheric pressure are March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in January
Ann Arbor, MI

Average wind speed in January: 10.1mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).

Average humidity in January
Ann Arbor, MI

Average humidity in January: 86%

The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (76%).

Average rainfall in January
Ann Arbor, MI

Average rainfall in January: 0.91"

The wettest month (with the highest rainfall) is May (2.4").
The driest month (with the least rainfall) is December (0.87").

Average rainfall days in January
Ann Arbor, MI

Average rainfall days in January: 5.2 days

The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is January (5.2 days).

Average snowfall in January
Ann Arbor, MI

Average snowfall in January: 2.48"

The month with the highest snowfall is February (2.72").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in January
Ann Arbor, MI

Average snowfall days in January: 11.5 days

The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in January /
Average sunshine in January
Ann Arbor, MI

Average daylight in January: 9h and 3min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).

Average sunshine in January: 3h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in January
Ann Arbor, MI

Average sunshine days in January: 16 days

The month with the most sunshine days is October (17.5 days).
The month with the least sunshine days is July (10.3 days).

Average UV index in January
Ann Arbor, MI

Average UV index in January: 2

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in January
Ann Arbor, MI

Average cloud cover in January: 68

The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in January
Ann Arbor, MI

Average visibility in January: 5mi

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

January weather forecast
Ann Arbor, MI

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