January weather forecast
River Junction, IA

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Weather in January

January, the same as December, in River Junction, Iowa, is a freezing cold winter month, with temperature in the range of an average low of 15.3°F (-9.3°C) and an average high of 27.3°F (-2.6°C).

Temperature

January stands out as River Junction's coldest month, with temperatures ranging between an average high of 27.3°F (-2.6°C) and a low of 15.3°F (-9.3°C).

Humidity

January and July, with an average relative humidity of 83%, are the most humid months.

Rainfall

The months with the least rainfall are January and February Rain falls for 5.7 days and accumulates 1.34" (34mm) of rain.

Snowfall

Months with snowfall are January through April, October through December. January is the month with the most snowfall in River Junction, Iowa. Snow falls for 10.9 days and accumulates 5.28" (134mm) of snow.

Daylight

In River Junction, Iowa, the average length of the day in January is 9h and 35min.
On the first day of the month, sunrise is at 7:32 am and sunset at 4:46 pm. On the last day of January, sunrise is at 7:18 am and sunset at 5:20 pm CST.

Sunshine

January has the least sunshine of the year in River Junction, Iowa, with an average of 4.2h of sunshine.

UV index

With an average maximum UV index of 1, January is the month with the lowest UV index. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In January, an average UV index of 1 transforms into the following instructions:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
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Frequently asked questions

What time of the year is the coldest in River Junction?

River Junction's January weather, with an average high temperature of 27.3°F (-2.6°C) and an average low temperature of 15.3°F (-9.3°C), tends to be the coldest of the year.

How cold is it in River Junction in January?

The high-temperature, in January, in River Junction, records 27.3°F (-2.6°C), while the low-temperature is 15.3°F (-9.3°C).

What is the most humid month in River Junction?

The months with the highest humidity are January and July, with an average relative humidity of 83%.

What is the average humidity in January in River Junction?

In January, the average relative humidity is 83%.

What is the driest month in River Junction?

The months with the least rainfall are January and February Rain falls for 5.7 days and accumulates 1.34" (34mm) of rain.

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

In River Junction, Iowa, during January, the rain falls for 5.7 days and regularly aggregates up to 1.34" (34mm) of precipitation.

When does it snow the most in River Junction?

January is the month with the most snowfall in River Junction. Snow falls for 10.9 days and accumulates 5.28" (134mm) of snow.

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

In River Junction, Iowa, during January, snow falls for 10.9 days and regularly aggregates up to 5.28" (134mm) of snow.

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

The average day length in January in River Junction is 9h and 35min.

When is the sunrise / sunset in January in River Junction?

In January, on the first day of the month, sunrise is at 7:32 am and sunset at 4:46 pm. On the last day of the month, in River Junction, sunrise is at 7:18 am and sunset at 5:20 pm CST.

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

The month with the least sunshine is January, with an average of 4.2h of sunshine.

How long on average sun shines in January in River Junction?

In River Junction, the average sunshine duration in January is 4.2h.

When is the lowest UV index in River Junction?

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

How high is the UV index in January in River Junction?

The average daily maximum UV index in January is 1. A UV Index reading of 2, and below, represents a minimal hazard to health from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
34°F 1.1°C
27.3°F -2.6°C
32°F 0°C
Average low temperature
22.8°F -5.1°C
15.3°F -9.3°C
19°F -7.2°C
Average pressure
30.11" 765mmHg
30.14" 766mmHg
30.12" 765mmHg
Average wind speed
9.9mph 15.9km/h
10.4mph 16.7km/h
10.4mph 16.7km/h
Average max. wind speed
10.6mph 17.1km/h
11.2mph 18km/h
11.1mph 17.9km/h
Average wind speed gusts
15.8mph 25.4km/h
16.8mph 27km/h
16.5mph 26.6km/h
Average humidity
80%
83%
82%
Average rainfall
1.46" 37mm
1.34" 34mm
1.34" 34mm
Average rainfall days
7
5.7
5
Average snowfall
2.28" 58mm
5.28" 134mm
4.84" 123mm
Average snowfall days
8.4
10.9
9.4
Average daylight
9h 1min
9h 4min
10h 4min
Average sunshine
4h 2min
4h 1min
4h 2min
Average sunshine days
17
16.3
15
Average UV index
2
1
2
Average cloud cover
53%
56%
54%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in January
River Junction, IA

Average temperature in January - River Junction, IA
  • Average high temperature in January: 27.3°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (27.3°F).

  • Average low temperature in January: 15.3°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).

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Average pressure in January
River Junction, IA

Average pressure in January - River Junction, 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 (29.9"Hg).

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Average wind speed in January
River Junction, IA

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

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).

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Average humidity in January
River Junction, IA

Average humidity in January - River Junction, IA
  • Average humidity in January: 83%

The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in January
River Junction, IA

Average rainfall in January - River Junction, IA
  • Average rainfall in January: 1.34"

The wettest month (with the highest rainfall) is May (4.69").
The driest months (with the least rainfall) are January and February (1.34").

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Average rainfall days in January
River Junction, IA

Average rainfall days in January - River Junction, IA
  • Average rainfall days in January: 5.7 days

The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is February (5 days).

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Average snowfall in January
River Junction, IA

Average snowfall in January - River Junction, IA
  • Average snowfall in January: 5.28"

The month with the highest snowfall is January (5.28").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in January
River Junction, IA

Average snowfall days in January - River Junction, IA
  • Average snowfall days in January: 10.9 days

The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in January /
Average sunshine in January
River Junction, IA

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

The month with the longest days is June (Average daylight: 15h and 6min).
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 0min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

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Average sunshine days in January
River Junction, IA

Average sunshine days in January - River Junction, IA
  • Average sunshine days in January: 16.3 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10 days).

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Average UV index in January
River Junction, IA

Average UV index in January - River Junction, 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
River Junction, IA

Average cloud cover in January - River Junction, IA
  • Average cloud cover in January: 56

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in January
River Junction, IA

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

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

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River Junction, Iowa, USA

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