January Weather forecast - Winter forecast

Weather in January
Frequently asked questions
Average temperature in January
Average pressure in January
Average wind speed in January
Average humidity in January
Average rainfall in January
Average rainfall days in January
Average snowfall in January
Average snowfall days in January
Average daylight in January
Average sunshine in January
Average sunshine days in January
Average UV index in January
Average cloud cover in January
Average visibility in January

Large, scenic rocks and trees around this tiny Sylvan Lake located in the tranquil Custer State Park in Custer City, South Dakota

Weather in January

January, like December, is another subzero cold winter month in Custer, South Dakota, with an average temperature ranging between min 17.1°F (-8.3°C) and max 31.1°F (-0.5°C).

Temperature

In Custer, the average high-temperature in January is relatively the same as in December - a still subzero cold 31.1°F (-0.5°C). In Custer, the average low-temperature is 17.1°F (-8.3°C).

Humidity

The months with the highest humidity in Custer, South Dakota, are January and February, with an average relative humidity of 77%.

Rainfall

January is the month with the least rainfall. Rain falls for 6.2 days and accumulates 0.47" (12mm) of precipitation.

Snowfall

Months with snowfall in Custer are January through May, September through December. In Custer, during January, snow falls for 12.3 days and regularly aggregates up to 3.54" (90mm) of snow. Throughout the year, in Custer, there are 75.1 snowfall days, and 40.24" (1022mm) of snow is accumulated.

Daylight

The average length of the day in January in Custer, South Dakota, is 9h and 22min.
On the first day of the month, sunrise is at 7:28 am and sunset at 4:27 pm. On the last day of January, in Custer, sunrise is at 7:12 am and sunset at 5:03 pm MST.

Sunshine

In January, the average sunshine in Custer is 6.3h.

UV index

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 2 in January transform into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

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FAQ

What is the temperature in January in Custer?

The average high-temperature, in January, in Custer, is 31.1°F (-0.5°C), while the average low-temperature is 17.1°F (-8.3°C).

What are the most humid months in Custer?

January and February, with an average relative humidity of 77%, are most humid months.

What is the average humidity in January in Custer?

In January, the average relative humidity in Custer is 77%.

What is the driest month in Custer?

January is the month with the least rainfall in Custer, South Dakota. Rain falls for 6.2 days and accumulates 0.47" (12mm) of precipitation.

How many days does it rain in January in Custer?

In Custer, South Dakota, in January, it is raining for 6.2 days, with typically 0.47" (12mm) of accumulated precipitation.

How many days does it snow in January in Custer?

In Custer, in January, snow falls for 12.3 days, with typically accumulated 3.54" (90mm) of snow.

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

In Custer, the average day length in January is 9h and 22min.

When are sunrise and sunset in January in Custer?

On the first day of January in Custer, South Dakota, sunrise is at 7:28 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 5:03 pm MST.

How long on average sun shines in January in Custer?

The average sunshine duration in January is 6.3h.

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

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Custer.

What is the UV index intensity in January in Custer?

In Custer, South Dakota, the average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

29.8°F -1.2°C

31.1°F -0.5°C

31.5°F -0.3°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

9.7mph 15.6km/h

10mph 16.1km/h

9.5mph 15.3km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

18.1

17.4

13.8

Average UV index

Average cloud cover

Average visibility

Average temperature in January
Custer, SD

Average high temperature in January: 31.1°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (29.8°F).

Average low temperature in January: 17.1°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is February (16.2°F).

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Average pressure in January
Custer, SD

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 (29.84"Hg).

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Average wind speed in January
Custer, SD

Average wind speed in January: 9.2mph

The windiest month (with the highest average wind speed) is April (9.5mph).
The calmest month (with the lowest average wind speed) is August (7mph).

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Average humidity in January
Custer, SD

Average humidity in January: 77%

The months with the highest relative humidity are January and February (77%).
The months with the lowest relative humidity are August and September (52%).

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Average rainfall in January
Custer, SD

Average rainfall in January: 0.47"

The wettest month (with the highest rainfall) is June (3.19").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in January
Custer, SD

Average rainfall days in January: 6.2 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is November (4.5 days).

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Average snowfall in January
Custer, SD

Average snowfall in January: 3.54"

The month with the highest snowfall is April (7.24").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in January
Custer, SD

Average snowfall days in January: 12.3 days

The month with the highest number of snowfall days is February (12.9 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in January /
Average sunshine in January
Custer, SD

Average daylight in January: 9h and 22min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 59min).

Average sunshine in January: 6h and 18min

The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 0min).

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Average sunshine days in January
Custer, SD

Average sunshine days in January: 17.4 days

The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is May (7.8 days).

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Average UV index in January
Custer, SD

Average UV index in January: 2

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

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Average cloud cover in January
Custer, SD

Average cloud cover in January: 35

The month with the most cloud cover is April (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 17).

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Average visibility in January
Custer, SD

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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January weather forecast
Custer, SD

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