January weather forecast
River Sioux, IA

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Weather in January

January, the same as December, in River Sioux, Iowa, is another subzero cold winter month, with an average temperature varying between 28.8°F (-1.8°C) and 15.3°F (-9.3°C).

Temperature

January stands out as River Sioux's coldest month, with temperatures ranging between an average high of 28.8°F (-1.8°C) and a low of 15.3°F (-9.3°C).

Humidity

January is the most humid month, with an average relative humidity of 81%.

Rainfall

The month with the least rainfall is January, when the rain falls for 4.3 days and typically collects 0.71" (18mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in River Sioux. The month with the most snowfall is January, when snow falls for 9.4 days and typically aggregates up to 2.8" (71mm) of snow.

Daylight

In January, the average length of the day in River Sioux is 9h and 33min.
On the first day of January, sunrise is at 7:51 am and sunset at 5:03 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 5:37 pm CST.

Sunshine

With an average of 4.7h of sunshine, January has the least sunshine of the year in River Sioux, Iowa.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the average person.
Note: An average UV index of 2 in January transforms into this advice:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
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Frequently asked questions

What month is the coldest in River Sioux?

River Sioux reaches its average lowest temperatures in January, measuring 28.8°F (-1.8°C) at the peak and 15.3°F (-9.3°C) at the lowest.

How cold is it in River Sioux in January?

The high-temperature, in January, in River Sioux, is 28.8°F (-1.8°C), while the low-temperature averages to 15.3°F (-9.3°C).

What is the most humid month in River Sioux?

With an average relative humidity of 81%, January is the most humid month in River Sioux.

What is the average humidity in January in River Sioux?

In January, the average relative humidity is 81%.

What is the driest month in River Sioux?

January is the month with the least rainfall in River Sioux, Iowa. Rain falls for 4.3 days and accumulates 0.71" (18mm) of precipitation.

How many days does it rain in January in River Sioux?

In River Sioux, Iowa, in January, it is raining for 4.3 days, with typically 0.71" (18mm) of accumulated precipitation.

What is the snowiest month in River Sioux?

The month with the most snowfall in River Sioux is January, when snow falls for 9.4 days and typically aggregates up to 2.8" (71mm) of snow.

How many days does it snow in January in River Sioux?

In River Sioux, in January, snow falls for 9.4 days, with typically accumulated 2.8" (71mm) of snow.

What is the average length of the day in January in River Sioux?

In River Sioux, the average day length in January is 9h and 33min.

What time are sunrise and sunset in January in River Sioux?

On the first day of January in River Sioux, Iowa, sunrise is at 7:51 am and sunset at 5:03 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 5:37 pm CST.

What is the month with the least sunshine in River Sioux?

January has the least sunshine of the year in River Sioux, with an average of 4.7h of sunshine.

How many hours of sunshine does River Sioux have in January?

The average sunshine duration in January in River Sioux, Iowa, is 4.7h.

What is the month with the lowest UV index in River Sioux?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in January in River Sioux?

In January, the average daily maximum UV index in River Sioux is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
32.9°F 0.5°C
28.8°F -1.8°C
32.7°F 0.4°C
Average low temperature
21°F -6.1°C
15.3°F -9.3°C
18.7°F -7.4°C
Average pressure
30.13" 765mmHg
30.16" 766mmHg
30.15" 766mmHg
Average wind speed
10mph 16.1km/h
10.4mph 16.7km/h
10.5mph 16.9km/h
Average max. wind speed
10.7mph 17.2km/h
11.1mph 17.9km/h
11.2mph 18km/h
Average wind speed gusts
16mph 25.7km/h
16.5mph 26.6km/h
16.2mph 26.1km/h
Average humidity
79%
81%
79%
Average rainfall
1.42" 36mm
0.71" 18mm
0.79" 20mm
Average rainfall days
4.6
4.3
3.3
Average snowfall
2.17" 55mm
2.8" 71mm
2.76" 70mm
Average snowfall days
6.8
9.4
7.9
Average daylight
9h 1min
9h 4min
10h 4min
Average sunshine
5h 0min
4h 4min
5h 3min
Average sunshine days
20.2
19.3
17.3
Average UV index
2
2
2
Average cloud cover
45%
49%
46%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in January
River Sioux, IA

Average temperature in January - River Sioux, IA
  • Average high temperature in January: 28.8°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (28.8°F).

  • Average low temperature in January: 15.3°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).

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Average pressure in January
River Sioux, IA

Average pressure in January - River Sioux, IA
  • Average pressure in January: 30.16"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed in January
River Sioux, IA

Average wind speed in January - River Sioux, IA
  • Average wind speed in January: 10.4mph

The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).

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Average humidity in January
River Sioux, IA

Average humidity in January - River Sioux, IA
  • Average humidity in January: 81%

The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is October (66%).

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Average rainfall in January
River Sioux, IA

Average rainfall in January - River Sioux, IA
  • Average rainfall in January: 0.71"

The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is January (0.71").

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Average rainfall days in January
River Sioux, IA

Average rainfall days in January - River Sioux, IA
  • Average rainfall days in January: 4.3 days

The month with the highest number of rainy days is June (16.8 days).
The month with the least rainy days is February (3.3 days).

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Average snowfall in January
River Sioux, IA

Average snowfall in January - River Sioux, IA
  • Average snowfall in January: 2.8"

The month with the highest snowfall is January (2.8").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
River Sioux, IA

Average snowfall days in January - River Sioux, IA
  • Average snowfall days in January: 9.4 days

The month with the highest number of snowfall days is January (9.4 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
River Sioux, IA

Average daylight in January / Average sunshine in January - River Sioux, 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 4min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

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Average sunshine days in January
River Sioux, IA

Average sunshine days in January - River Sioux, IA
  • Average sunshine days in January: 19.3 days

The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is June (11.3 days).

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Average UV index in January
River Sioux, IA

Average UV index in January - River Sioux, IA
  • Average UV index in January: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in January
River Sioux, IA

Average cloud cover in January - River Sioux, IA
  • Average cloud cover in January: 49

The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 25).

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Average visibility in January
River Sioux, IA

Average visibility in January - River Sioux, IA
  • Average visibility in January: 6mi

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

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River Sioux, Iowa, USA

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