January weather forecast
Castle Grove, IA

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Weather in January

January, the same as December, in Castle Grove, Iowa, is another subzero cold winter month, with an average temperature ranging between min 13.3°F (-10.4°C) and max 25.2°F (-3.8°C).

Temperature

January is the month when Castle Grove sees the lowest average temperatures, with a high of 25.2°F (-3.8°C) and a low of 13.3°F (-10.4°C).

Humidity

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

Rainfall

The months with the least rainfall in Castle Grove are January and February Rain falls for 5.2 days and accumulates 1.26" (32mm) of rain.

Snowfall

January through April, October through December are months with snowfall. January is the month with the most snowfall. Snow falls for 12.1 days and accumulates 5.04" (128mm) of snow.

Daylight

The average length of the day in January is 9h and 31min.
On the first day of January, sunrise is at 7:34 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 5:17 pm CST.

Sunshine

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

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In January, a daily UV index of 1 turns into the following recommendations:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.

Frequently asked questions

What is the coldest time of year?

In Castle Grove, January registers the lowest temperatures, averaging 25.2°F (-3.8°C) at the peak and 13.3°F (-10.4°C) at the lowest.

How cold is January in Castle Grove?

In January, in Castle Grove, the average high-temperature is 25.2°F (-3.8°C), and the average low-temperature is 13.3°F (-10.4°C).

What is the most humid month?

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

What is the average humidity in January in Castle Grove?

In January, the average relative humidity is 86%.

What is the driest month?

The months with the least rainfall in Castle Grove are January and February Rain falls for 5.2 days and accumulates 1.26" (32mm) of rain.

How many days does it rain in January?

In Castle Grove, Iowa, in January, it is raining for 5.2 days, with typically 1.26" (32mm) of accumulated precipitation.

When does it snow the most?

January is the month with the most snowfall in Castle Grove. Snow falls for 12.1 days and accumulates 5.04" (128mm) of snow.

How many days does it snow in January?

In Castle Grove, in January, during 12.1 snowfall days, 5.04" (128mm) of snow is typically accumulated.

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 7:34 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 5:17 pm CST.

What is the month with the least sunshine?

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

How long on average sun shines in January?

The average sunshine duration in January is 3.8h.

What are the months with the lowest UV index?

The months with the lowest UV index are January and December, with an average maximum UV index of 1.

How high is the UV index in January?

In Castle Grove, the average daily maximum UV index in January is 1. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Castle Grove, IA

Average temperature in January - Castle Grove, IA
  • Average high temperature in January: 25.2°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 (25.2°F).

  • Average low temperature in January: 13.3°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).

Average pressure in January
Castle Grove, IA

Average pressure in January - Castle Grove, IA
  • Average pressure in January: 30.13"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in January
Castle Grove, IA

Average wind speed in January - Castle Grove, IA
  • Average wind speed in January: 10.4mph

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

Average humidity in January
Castle Grove, IA

Average humidity in January - Castle Grove, IA
  • 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 October (74%).

Average rainfall in January
Castle Grove, IA

Average rainfall in January - Castle Grove, IA
  • Average rainfall in January: 1.26"

The wettest month (with the highest rainfall) is May (4.25").
The driest months (with the least rainfall) are January and February (1.26").

Average rainfall days in January
Castle Grove, IA

Average rainfall days in January - Castle Grove, IA
  • Average rainfall days in January: 5.2 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is January (5.2 days).

Average snowfall in January
Castle Grove, IA

Average snowfall in January - Castle Grove, IA
  • Average snowfall in January: 5.04"

The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in January
Castle Grove, IA

Average snowfall days in January - Castle Grove, IA
  • Average snowfall days in January: 12.1 days

The month with the highest number of snowfall days is January (12.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in January /
Average sunshine in January
Castle Grove, IA

Average daylight in January / Average sunshine in January - Castle Grove, 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 12min).

  • Average sunshine in January: 3h and 5min

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

Average sunshine days in January
Castle Grove, IA

Average sunshine days in January - Castle Grove, IA
  • Average sunshine days in January: 15.8 days

The month with the most sunshine days is September (17 days).
The month with the least sunshine days is June (10.5 days).

Average UV index in January
Castle Grove, IA

Average UV index in January - Castle Grove, IA
  • Average UV index in January: 1

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

Average cloud cover in January
Castle Grove, IA

Average cloud cover in January - Castle Grove, 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 30).

Average visibility in January
Castle Grove, IA

Average visibility in January - Castle Grove, IA
  • Average visibility in January: 5mi

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

Castle Grove, Iowa, USA

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