Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The shift from November to December involves a decrease in the average high-temperature, from a frosty 48.2°F (9°C) to an icy 37.6°F (3.1°C). Nighttime temperatures consistently average a subzero cold 27.1°F (-2.7°C) during December.Humidity
In Black Rock, the average relative humidity in December is 81%.Rainfall
In Black Rock, Indiana, in December, during 7.4 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. Throughout the year, there are 130.9 rainfall days, and 18.23" (463mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall in Black Rock. 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
December has the shortest days of the year, 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 Black Rock, the average sunshine in December is 4.3h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index in Black Rock, Indiana. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A typical high UV index of 1 in December suggests the following recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Frequently asked questions
How cold is December in Black Rock?
What is the average humidity in December in Black Rock?
How much does it rain in Black Rock in December?
How much does it snow in Black Rock in December?
What is the month with the shortest days in Black Rock?
What is the average length of the day in December in Black Rock?
When are sunrise and sunset in December in Black Rock?
How many hours of sunshine does Black Rock have in December?
When is the lowest UV index in Black Rock?
What is the UV index intensity in December in Black Rock?
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 2min
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 2min
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).
Black Rock, Indiana, USA
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