December weather forecast
Goodwin, SD

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Weather in December

December, the first month of the winter in Goodwin, is also a subzero cold month, with an average temperature varying between 23.7°F (-4.6°C) and 12.4°F (-10.9°C).

Temperature

The arrival of December is marked by a notable decrease in high-temperatures, falling from an icy 40.1°F (4.5°C) in November to a freezing cold 23.7°F (-4.6°C). Goodwin's nights in December experience an average temperature drop to an extreme cold 12.4°F (-10.9°C).

Humidity

In December, the average relative humidity in Goodwin is 87%.

Rainfall

In Goodwin, in December, it is raining for 3.5 days, with typically 0.75" (19mm) of accumulated precipitation. Throughout the year, there are 112.3 rainfall days, and 18.78" (477mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. The months with the most snowfall are January and December, with an average 3.74" (95mm) of accumulated snow.

Daylight

With an average of 8h and 54min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:45 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 8:05 am and sunset at 4:56 pm CST.

Sunshine

The average sunshine in December is 4h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum UV index of 1 during December leads to these instructions:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.

Frequently asked questions

How cold is it in December?

The average high-temperature, in December, in Goodwin, is 23.7°F (-4.6°C), while the average low-temperature is 12.4°F (-10.9°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, in July is estimated at 84.2°F (29°C).

What is the average humidity in December in Goodwin?

In December, the average relative humidity is 87%.

How much does it rain in December?

In Goodwin, in December, during 3.5 rainfall days, 0.75" (19mm) of precipitation is typically accumulated.

When does it snow the most?

The months with the most snowfall are January and December, with an average 3.74" (95mm) of accumulated snow.

How many days does it snow in December?

In Goodwin, in December, during 13 snowfall days, 3.74" (95mm) of snow is typically accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 8h and 54min of daylight.

What is the average length of the day in December?

In December, the average day length is 8h and 51min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:45 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 8:05 am and sunset at 4:56 pm CST.

How many hours of sunshine does Goodwin have in December?

The average sunshine duration in December is 4h.

When is the lowest UV index?

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

What is the UV index reading in December?

In Goodwin, the average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation.
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
Goodwin, SD

Average temperature in December - Goodwin, SD
  • Average high temperature in December: 23.7°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (19.4°F).

  • Average low temperature in December: 12.4°F

The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is January (5.5°F).

Average pressure in December
Goodwin, SD

Average pressure in December - Goodwin, SD
  • Average pressure in December: 30.13"Hg

The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

Average wind speed in December
Goodwin, SD

Average wind speed in December - Goodwin, SD
  • Average wind speed in December: 11mph

The windiest month (with the highest average wind speed) is April (11.6mph).
The calmest month (with the lowest average wind speed) is July (8.5mph).

Average humidity in December
Goodwin, SD

Average humidity in December - Goodwin, SD
  • Average humidity in December: 87%

The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are September and October (68%).

Average rainfall in December
Goodwin, SD

Average rainfall in December - Goodwin, SD
  • Average rainfall in December: 0.75"

The wettest month (with the highest rainfall) is June (3.19").
The driest months (with the least rainfall) are January and February (0.59").

Average rainfall days in December
Goodwin, SD

Average rainfall days in December - Goodwin, SD
  • Average rainfall days in December: 3.5 days

The month with the highest number of rainy days is June (17.2 days).
The month with the least rainy days is February (2.7 days).

Average snowfall in December
Goodwin, SD

Average snowfall in December - Goodwin, SD
  • Average snowfall in December: 3.74"

The months with the highest snowfall are January and December (3.74").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Goodwin, SD

Average snowfall days in December - Goodwin, SD
  • Average snowfall days in December: 13 days

The month with the highest number of snowfall days is January (14.4 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Goodwin, SD
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in December: 4h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

Average sunshine days in December
Goodwin, SD

Average sunshine days in December - Goodwin, SD
  • Average sunshine days in December: 16.3 days

The month with the most sunshine days is October (19.1 days).
The month with the least sunshine days is June (10.3 days).

Average UV index in December
Goodwin, SD

Average UV index in December - Goodwin, SD
  • Average UV index in December: 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 December
Goodwin, SD

Average cloud cover in December - Goodwin, SD
  • Average cloud cover in December: 59

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in December
Goodwin, SD

Average visibility in December - Goodwin, SD
  • Average visibility in December: 6mi

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

Goodwin, South Dakota, USA

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