December weather forecastBlack Rock, IN
December
Weather in December
The first month of the winter, December, is also a wintry month in Black Rock, Indiana, with an average temperature varying between 27.1°F (-2.7°C) and 37.6°F (3.1°C).Temperature
The transition into December is accompanied by a temperature decrease, with the average high-temperature shifting from a frosty 48.2°F (9°C) in November to an icy 37.6°F (3.1°C). Throughout December, an average low-temperature of 27.1°F (-2.7°C) is experienced.Humidity
In December, the average relative humidity is 81%.Rainfall
In December, the rain falls for 7.4 days. Throughout December, 0.98" (25mm) of precipitation is accumulated. Throughout the year, there are 130.9 rainfall days, and 18.23" (463mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In Black Rock, in December, snow falls for 4.7 days, with typically accumulated 1.18" (30mm) of snow. Throughout the year, there are 28.3 snowfall days, and 7.36" (187mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:52 am and sunset at 5:22 pm. On the last day of the month, sunrise is at 8:11 am and sunset at 5:32 pm EST.
Sunshine
In December, the average sunshine is 4.3h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability 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:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Black Rock, IN
- Average high temperature in December: 37.6°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.1°F).
- Average low temperature in December: 27.1°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure in December
Black Rock, IN
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Black Rock, IN
- Average wind speed in December: 9.6mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in December
Black Rock, IN
- Average humidity in December: 81%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Black Rock, IN
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is May (2.36").
The driest months (with the least rainfall) are February and November (0.94").
Average rainfall days in December
Black Rock, IN
- Average rainfall days in December: 7.4 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is January (5.1 days).
Average snowfall in December
Black Rock, IN
- Average snowfall in December: 1.18"
The month with the highest snowfall is February (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Black Rock, IN
- Average snowfall days in December: 4.7 days
The month with the highest number of snowfall days is January (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
Black Rock, IN
- Average daylight in December: 9h and 18min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 18min
The month with the most sunshine is June (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Black Rock, IN
- Average sunshine days in December: 19.8 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is July (11.7 days).
Average UV index in December
Black Rock, IN
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Black Rock, IN
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are June, August and September (Cloud cover 34).
Average visibility in December
Black Rock, IN
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
