January weather forecast
Waterloo, IA

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Weather in January

Iowa residents all know that January in Waterloo is defined by snowfall and cold temperatures. Snow blankets the city while the wind blows the white, icy powder around. This month experiences the coldest temperatures, with the high barely reaching 24.3°F (-4.3°C) and the low plummeting to 12°F (-11.1°C). If outdoor activities are planned during January, it's imperative to be diligent in monitoring the weather forecast and dressing appropriately in warm, layered clothing. The January sky is typically overcast, yet there are still moments of sunshine to be appreciated.

Temperature

January is the coldest month in Waterloo, exhibiting average temperatures of 24.3°F (-4.3°C) at the peak and 12°F (-11.1°C) at the base.

Humidity

With an average relative humidity of 87%, January is the most humid month in Waterloo.

Rainfall

The months with the least rainfall are January and February Rain falls for 4.1 days and accumulates 1.02" (26mm) of rain.

Snowfall

Months with snowfall are January through May, October through December. January is the month with the most snowfall. Snow falls for 11.5 days and accumulates 4.21" (107mm) of snow.

Daylight

The average length of the day in January in Waterloo is 9h and 29min.
On the first day of January, sunrise is at 7:38 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:21 pm CST.

Sunshine

January has the least sunshine of the year in Waterloo, with an average of 3.8h of sunshine.

UV index

The average daily maximum UV index in January in Waterloo is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 2 in January interprets into the following recommendations:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
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Frequently asked questions

What month is the coldest in Waterloo?

With average temperatures fluctuating between a high of 24.3°F (-4.3°C) and a low of 12°F (-11.1°C), January stands out as the coldest month in Waterloo, Iowa.

How cold is January in Waterloo?

In January, in Waterloo, the average high-temperature is 24.3°F (-4.3°C), and the average low-temperature is 12°F (-11.1°C).

What is the most humid month in Waterloo?

The most humid month in Waterloo is January, with an average relative humidity of 87%.

What is the average humidity in January in Waterloo?

In January, the average relative humidity in Waterloo is 87%.

What is the driest month in Waterloo?

The months with the least rainfall in Waterloo, Iowa, are January and February Rain falls for 4.1 days and accumulates 1.02" (26mm) of rain.

How much does it rain in Waterloo in January?

In Waterloo, Iowa, during January, the rain falls for 4.1 days and regularly aggregates up to 1.02" (26mm) of precipitation.

When does it snow the most in Waterloo?

The month with the most snowfall in Waterloo is January, when snow falls for 11.5 days and typically aggregates up to 4.21" (107mm) of snow.

How much does it snow in Waterloo in January?

In Waterloo, in January, during 11.5 snowfall days, 4.21" (107mm) of snow is typically accumulated.

What is the average length of the day in January in Waterloo?

The average day length in January in Waterloo, Iowa, is 9h and 29min.

When are sunrise and sunset in January in Waterloo?

On the first day of January, sunrise is at 7:38 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:21 pm CST.

What is the month with the least sunshine in Waterloo?

With an average of 3.8h of sunshine, January has the least sunshine of the year in Waterloo, Iowa.

How many hours of sunshine does Waterloo have in January?

In Waterloo, the average sunshine duration in January is 3.8h.

How high is the UV index in January in Waterloo?

In Waterloo, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a low health threat from unprotected exposure to UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
31.1°F -0.5°C
24.3°F -4.3°C
28.4°F -2°C
Average low temperature
20.5°F -6.4°C
12°F -11.1°C
15.4°F -9.2°C
Average pressure
30.11" 765mmHg
30.14" 766mmHg
30.13" 765mmHg
Average wind speed
10.1mph 16.3km/h
10.5mph 16.9km/h
10.4mph 16.7km/h
Average max. wind speed
10.7mph 17.2km/h
11.2mph 18km/h
11.1mph 17.9km/h
Average wind speed gusts
15.8mph 25.4km/h
16.7mph 26.9km/h
16.6mph 26.7km/h
Average humidity
82%
87%
86%
Average rainfall
1.34" 34mm
1.02" 26mm
1.02" 26mm
Average rainfall days
5.8
4.1
4
Average snowfall
2.8" 71mm
4.21" 107mm
4.17" 106mm
Average snowfall days
8.9
11.5
9.9
Average daylight
9h 1min
9h 3min
10h 4min
Average sunshine
4h 2min
3h 5min
4h 0min
Average sunshine days
17.7
16.1
14.3
Average UV index
1
2
2
Average cloud cover
56%
60%
57%
Average visibility
6mi 9.7km
5mi 8km
6mi 9.7km

Average temperature in January
Waterloo, IA

Average temperature in January - Waterloo, IA
  • Average high temperature in January: 24.3°F

The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (24.3°F).

  • Average low temperature in January: 12°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (12°F).

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Average pressure in January
Waterloo, IA

Average pressure in January - Waterloo, IA
  • Average pressure in January: 30.14"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed in January
Waterloo, IA

Average wind speed in January - Waterloo, IA
  • Average wind speed in January: 10.5mph

The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is August (7mph).

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Average humidity in January
Waterloo, IA

Average humidity in January - Waterloo, IA
  • Average humidity in January: 87%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in January
Waterloo, IA

Average rainfall in January - Waterloo, IA
  • Average rainfall in January: 1.02"

The wettest month (with the highest rainfall) is June (4.29").
The driest months (with the least rainfall) are January and February (1.02").

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Average rainfall days in January
Waterloo, IA

Average rainfall days in January - Waterloo, IA
  • Average rainfall days in January: 4.1 days

The month with the highest number of rainy days is June (18.1 days).
The month with the least rainy days is February (4 days).

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Average snowfall in January
Waterloo, IA

Average snowfall in January - Waterloo, IA
  • Average snowfall in January: 4.21"

The month with the highest snowfall is January (4.21").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Waterloo, IA

Average snowfall days in January - Waterloo, IA
  • 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).

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Average daylight in January /
Average sunshine in January
Waterloo, IA

Average daylight in January / Average sunshine in January - Waterloo, IA
  • 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 5min

The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

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Average sunshine days in January
Waterloo, IA

Average sunshine days in January - Waterloo, IA
  • Average sunshine days in January: 16.1 days

The month with the most sunshine days is October (17.8 days).
The month with the least sunshine days is June (10 days).

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Average UV index in January
Waterloo, IA

Average UV index in January - Waterloo, IA
  • Average UV index in January: 2

The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in January
Waterloo, IA

Average cloud cover in January - Waterloo, IA
  • Average cloud cover in January: 60

The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in January
Waterloo, IA

Average visibility in January - Waterloo, IA
  • Average visibility in January: 5mi

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

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Waterloo, Iowa, USA

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