December weather forecast
Denby, SD

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Weather in December

The first month of the winter, December, is also an icy month in Denby, South Dakota, with an average temperature fluctuating between 32.4°F (0.2°C) and 18.7°F (-7.4°C).

Temperature

Denby reaches its lowest average temperatures in December, measuring 32.4°F (0.2°C) at the peak and 18.7°F (-7.4°C) at the lowest.

Humidity

In Denby, the average relative humidity in December is 76%.

Rainfall

In December, in Denby, the rain falls for 2.5 days. Throughout December, 0.87" (22mm) of precipitation is accumulated. In Denby, during the entire year, the rain falls for 86.7 days and collects up to 13.66" (347mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Denby. In Denby, in December, snow falls for 8.2 days, with typically accumulated 3.9" (99mm) of snow. Throughout the year, in Denby, there are 47.4 snowfall days, and 22.72" (577mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 6min of daylight.
On the first day of the month, sunrise is at 7:01 am and sunset at 4:15 pm. On the last day of December, in Denby, sunrise is at 7:20 am and sunset at 4:24 pm MST.

Sunshine

In December, the average sunshine is 5.7h.

UV index

The months with the lowest UV index in Denby are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for average individuals.
Note: A typical high UV index of 2 in December suggests the following recommendations:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
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Frequently asked questions

What part of the year is the coldest in Denby?

December is the month when Denby, South Dakota, sees the average lowest temperatures, with a high of 32.4°F (0.2°C) and a low of 18.7°F (-7.4°C).

How cold is December in Denby?

In December, the average high-temperature and low-temperature in Denby, South Dakota, are 32.4°F (0.2°C) and 18.7°F (-7.4°C) respectively. In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is evaluated at 86°F (30°C).

What is the average humidity in December in Denby?

The average relative humidity in December is 76%.

How many days does it rain in December in Denby?

In Denby, during December, the rain falls for 2.5 days and regularly aggregates up to 0.87" (22mm) of precipitation.

How many days does it snow in December in Denby?

In Denby, in December, during 8.2 snowfall days, 3.9" (99mm) of snow is typically accumulated.

What is the month with the shortest days in Denby?

With an average of 9h and 6min of daylight, December has the shortest days of the year in Denby, South Dakota.

What is the average length of the day in December in Denby?

In December, the average day length in Denby is 9h and 4min.

What time are sunrise and sunset in December in Denby?

In December, on the first day of the month, sunrise is at 7:01 am and sunset at 4:15 pm. On the last day of the month, in Denby, South Dakota, sunrise is at 7:20 am and sunset at 4:24 pm MST.

How long on average sun shines in December in Denby?

In December, the average sunshine duration is 5.7h.

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

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

What is the UV index intensity in December in Denby?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability 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 December
Denby, SD

Average temperature in December - Denby, SD
  • Average high temperature in December: 32.4°F

The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is December (32.4°F).

  • Average low temperature in December: 18.7°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 (18.1°F).

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Average pressure in December
Denby, SD

Average pressure in December - Denby, SD
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

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Average wind speed in December
Denby, SD

Average wind speed in December - Denby, SD
  • Average wind speed in December: 10.4mph

The windiest month (with the highest average wind speed) is April (12.2mph).
The calmest month (with the lowest average wind speed) is August (10.2mph).

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Average humidity in December
Denby, SD

Average humidity in December - Denby, SD
  • Average humidity in December: 76%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is August (48%).

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Average rainfall in December
Denby, SD

Average rainfall in December - Denby, SD
  • Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is January (0.55").

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Average rainfall days in December
Denby, SD

Average rainfall days in December - Denby, SD
  • Average rainfall days in December: 2.5 days

The month with the highest number of rainy days is May (13.1 days).
The months with the least rainy days are February and December (2.5 days).

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Average snowfall in December
Denby, SD

Average snowfall in December - Denby, SD
  • Average snowfall in December: 3.9"

The month with the highest snowfall is February (4.02").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in December
Denby, SD

Average snowfall days in December - Denby, SD
  • Average snowfall days in December: 8.2 days

The month with the highest number of snowfall days is February (11.5 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in December /
Average sunshine in December
Denby, SD

Average daylight in December / Average sunshine in December - Denby, SD
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in December: 5h and 4min

The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).

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Average sunshine days in December
Denby, SD

Average sunshine days in December - Denby, SD
  • Average sunshine days in December: 20.8 days

The month with the most sunshine days is September (22.8 days).
The month with the least sunshine days is April (13.2 days).

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Average UV index in December
Denby, SD

Average UV index in December - Denby, SD
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Denby, SD

Average cloud cover in December - Denby, SD
  • Average cloud cover in December: 39

The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 16).

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Average visibility in December
Denby, SD

Average visibility in December - Denby, SD
  • Average visibility in December: 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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Denby, South Dakota, USA

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