December weather forecastHayes, SD
December
Weather in December
December, the first month of the winter in Hayes, is still a freezing cold month, with temperature in the range of an average low of 18°F (-7.8°C) and an average high of 30.7°F (-0.7°C).Temperature
Hayes's transition into December marks a considerable drop in the average high-temperature, moving down from a frosty 46.4°F (8°C) in November to a freezing cold 30.7°F (-0.7°C). In Hayes, the expected average low-temperature for December is a still subzero cold 18°F (-7.8°C).Humidity
In Hayes, the average relative humidity in December is 79%.Rainfall
In Hayes, during December, the rain falls for 2.7 days and regularly aggregates up to 0.71" (18mm) of precipitation. In Hayes, during the entire year, the rain falls for 95.3 days and collects up to 13.74" (349mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In December, in Hayes, South Dakota, it is snowing for 6.9 days. Throughout December, 2.95" (75mm) of snow is accumulated. Throughout the year, there are 38.8 snowfall days, and 16.1" (409mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 8h and 54min of daylight.On the first day of December, sunrise is at 7:00 am and sunset at 4:06 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:14 pm MST.
Sunshine
In December, the average sunshine is 5.3h.UV index
With an average maximum UV index of 1, December is the month 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 radiation for the average person.Note: In December, the average maximum UV index of 1 translates into the following recommendations:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Hayes, SD
- Average high temperature in December: 30.7°F
The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in December: 18°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure in December
Hayes, SD
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Hayes, SD
- Average wind speed in December: 10.3mph
The windiest month (with the highest average wind speed) is April (12.1mph).
The calmest month (with the lowest average wind speed) is February (10.1mph).
Average humidity in December
Hayes, SD
- Average humidity in December: 79%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is September (47%).
Average rainfall in December
Hayes, SD
- Average rainfall in December: 0.71"
The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in December
Hayes, SD
- Average rainfall days in December: 2.7 days
The month with the highest number of rainy days is May (13.5 days).
The month with the least rainy days is February (2.6 days).
Average snowfall in December
Hayes, SD
- Average snowfall in December: 2.95"
The month with the highest snowfall is February (3.15").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Hayes, SD
- Average snowfall days in December: 6.9 days
The month with the highest number of snowfall days is February (8.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Hayes, SD
- Average daylight in December: 8h and 54min
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: 5h and 18min
The month with the most sunshine is August (Average sunshine: 11h and 42min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).
Average sunshine days in December
Hayes, SD
- Average sunshine days in December: 21.1 days
The month with the most sunshine days is December (21.1 days).
The months with the least sunshine days are April and June (14.1 days).
Average UV index in December
Hayes, SD
- Average UV index in December: 1
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Hayes, SD
- Average cloud cover in December: 44
The month with the most cloud cover is January (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in December
Hayes, 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).
