January weather forecast
Grinnell, IA

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Weather in January

January, like December, is a freezing cold winter month in Grinnell, Iowa, with an average temperature varying between 13.8°F (-10.1°C) and 27°F (-2.8°C).

Temperature

Grinnell's coldest weather arrives in January, when temperatures average a high of 27°F (-2.8°C) and a low of 13.8°F (-10.1°C).

Humidity

January is the most humid month in Grinnell, with an average relative humidity of 84%.

Rainfall

January is the month with the least rainfall in Grinnell. Rain falls for 4.3 days and accumulates 0.47" (12mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Grinnell, Iowa. January is the month with the most snowfall. Snow falls for 8.1 days and accumulates 1.81" (46mm) of snow.

Daylight

The average length of the day in January in Grinnell is 9h and 34min.
On the first day of the month, sunrise is at 7:38 am and sunset at 4:50 pm. On the last day of January, sunrise is at 7:24 am and sunset at 5:24 pm CST.

Sunshine

With an average of 4.1h of sunshine, January has the least sunshine of the year in Grinnell.

UV index

January is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the average person.
Note: In January, a daily maximum UV index of 1 leads to the following instructions:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
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Frequently asked questions

What are the coldest months in Grinnell?

The coldest period is January, when temperatures fluctuate between an average high of 27°F (-2.8°C) and a low of 13.8°F (-10.1°C).

How cold is it in Grinnell in January?

The average high-temperature, in January, in Grinnell, is 27°F (-2.8°C), while the average low-temperature is 13.8°F (-10.1°C).

What is the most humid month in Grinnell?

January is the most humid month in Grinnell, Iowa, with an average relative humidity of 84%.

What is the average humidity in January in Grinnell?

The average relative humidity in January in Grinnell, Iowa, is 84%.

What is the driest month in Grinnell?

The month with the least rainfall in Grinnell is January, when the rain falls for 4.3 days and typically collects 0.47" (12mm) of precipitation.

How many days does it rain in January in Grinnell?

In Grinnell, Iowa, during January, the rain falls for 4.3 days and regularly aggregates up to 0.47" (12mm) of precipitation.

When does it snow the most in Grinnell?

January is the month with the most snowfall in Grinnell, Iowa. Snow falls for 8.1 days and accumulates 1.81" (46mm) of snow.

How many days does it snow in January in Grinnell?

In January, it is snowing for 8.1 days. Throughout January, 1.81" (46mm) of snow is accumulated.

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

In January, the average day length is 9h and 34min.

When is the sunrise / sunset in January in Grinnell?

On the first day of January, sunrise is at 7:38 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:24 pm CST.

What is the month with the least sunshine in Grinnell?

With an average of 4.1h of sunshine, January has the least sunshine of the year in Grinnell, Iowa.

How long on average sun shines in January in Grinnell?

The average sunshine duration in January in Grinnell, Iowa, is 4.1h.

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

January is the month with the lowest UV index in Grinnell, Iowa, with an average maximum UV index of 1.

What is the UV index intensity in January in Grinnell?

In January, the average daily maximum UV index in Grinnell, Iowa, is 1. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
33.1°F 0.6°C
27°F -2.8°C
31.1°F -0.5°C
Average low temperature
22.1°F -5.5°C
13.8°F -10.1°C
17.4°F -8.1°C
Average pressure
30.11" 765mmHg
30.15" 766mmHg
30.14" 766mmHg
Average wind speed
10.1mph 16.3km/h
10.6mph 17.1km/h
10.5mph 16.9km/h
Average max. wind speed
10.8mph 17.4km/h
11.2mph 18km/h
11.2mph 18km/h
Average wind speed gusts
15.9mph 25.6km/h
16.9mph 27.2km/h
16.6mph 26.7km/h
Average humidity
80%
84%
83%
Average rainfall
0.51" 13mm
0.47" 12mm
0.51" 13mm
Average rainfall days
5.7
4.3
4.1
Average snowfall
0.79" 20mm
1.81" 46mm
1.77" 45mm
Average snowfall days
6.9
8.1
7.8
Average daylight
9h 1min
9h 4min
10h 4min
Average sunshine
4h 4min
4h 1min
4h 2min
Average sunshine days
20.9
21.1
17.8
Average UV index
2
1
2
Average cloud cover
52%
55%
53%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in January
Grinnell, IA

Average temperature in January - Grinnell, IA
  • Average high temperature in January: 27°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (27°F).

  • Average low temperature in January: 13.8°F

The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).

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Average pressure in January
Grinnell, IA

Average pressure in January - Grinnell, IA
  • Average pressure in January: 30.15"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed in January
Grinnell, IA

Average wind speed in January - Grinnell, IA
  • Average wind speed in January: 10.6mph

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (7mph).

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Average humidity in January
Grinnell, IA

Average humidity in January - Grinnell, IA
  • Average humidity in January: 84%

The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in January
Grinnell, IA

Average rainfall in January - Grinnell, IA
  • Average rainfall in January: 0.47"

The wettest months (with the highest rainfall) are May and June (1.97").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in January
Grinnell, IA

Average rainfall days in January - Grinnell, IA
  • Average rainfall days in January: 4.3 days

The month with the highest number of rainy days is June (15.1 days).
The month with the least rainy days is February (4.1 days).

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Average snowfall in January
Grinnell, IA

Average snowfall in January - Grinnell, IA
  • Average snowfall in January: 1.81"

The month with the highest snowfall is January (1.81").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Grinnell, IA

Average snowfall days in January - Grinnell, IA
  • Average snowfall days in January: 8.1 days

The month with the highest number of snowfall days is January (8.1 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
Grinnell, IA

Average daylight in January / Average sunshine in January - Grinnell, IA
  • Average daylight in January: 9h and 4min

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 12min).

  • Average sunshine in January: 4h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days in January
Grinnell, IA

Average sunshine days in January - Grinnell, IA
  • Average sunshine days in January: 21.1 days

The month with the most sunshine days is January (21.1 days).
The month with the least sunshine days is June (11.5 days).

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Average UV index in January
Grinnell, IA

Average UV index in January - Grinnell, IA
  • Average UV index in January: 1

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

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Average cloud cover in January
Grinnell, IA

Average cloud cover in January - Grinnell, IA
  • Average cloud cover in January: 55

The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is September (Cloud cover 29).

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Average visibility in January
Grinnell, IA

Average visibility in January - Grinnell, IA
  • Average visibility in January: 6mi

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

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Grinnell, Iowa, USA

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