January weather forecast
Keystone, SD

Weather in January

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

Temperature

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

Humidity

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

Rainfall

The month with the least rainfall is January, when the rain falls for 6.2 days and typically collects 0.47" (12mm) of precipitation.

Snowfall

Months with snowfall in Keystone are January through May, September through December. In Keystone, South Dakota, during 12.3 snowfall days, 3.54" (90mm) of snow is typically accumulated. Throughout the year, in Keystone, South Dakota, there are 75.1 snowfall days, and 40.24" (1022mm) of snow is accumulated.

Daylight

The average length of the day in January in Keystone is 9h and 21min.
On the first day of January in Keystone, sunrise is at 7:27 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 5:02 pm MST.

Sunshine

The average sunshine in January 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 estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the average person.
Note: The average daily UV index of 2 in January transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What are the most humid months in Keystone?

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

What is the average humidity in January in Keystone?

In Keystone, South Dakota, the average relative humidity in January is 77%.

What is the driest month in Keystone?

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

How much does it rain in Keystone in January?

In Keystone, during January, the rain falls for 6.2 days and regularly aggregates up to 0.47" (12mm) of precipitation.

How many days does it snow in January in Keystone?

In Keystone, South Dakota, 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 Keystone?

In Keystone, South Dakota, the average day length in January is 9h and 21min.

What time are sunrise and sunset in January in Keystone?

On the first day of January, sunrise is at 7:27 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 5:02 pm MST.

How many hours of sunshine does Keystone have in January?

The average sunshine duration in January in Keystone, South Dakota, is 6.3h.

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

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

How high is the UV index in January in Keystone?

In January, the average daily maximum UV index in Keystone is 2. A UV Index reading of 2, and below, represents a low health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Keystone, SD

Average temperature in January - Keystone, 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
Keystone, SD

Average pressure in January - Keystone, 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
Keystone, SD

Average wind speed in January - Keystone, 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
Keystone, SD

Average humidity in January - Keystone, 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
Keystone, SD

Average rainfall in January - Keystone, 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
Keystone, SD

Average rainfall days in January - Keystone, 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
Keystone, SD

Average snowfall in January - Keystone, 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
Keystone, SD

Average snowfall days in January - Keystone, 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
Keystone, SD

Average daylight in January / Average sunshine in January - Keystone, SD
  • Average daylight in January: 9h and 21min

The month with the longest days is June (Average daylight: 15h and 25min).
The month with the shortest days is December (Average daylight: 8h and 58min).

  • 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
Keystone, SD

Average sunshine days in January - Keystone, 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
Keystone, SD

Average UV index in January - Keystone, 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
Keystone, SD

Average cloud cover in January - Keystone, 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
Keystone, SD

Average visibility in January - Keystone, 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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