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
A decrease in the average high-temperature is observed during December, shifting from a frosty 47.1°F (8.4°C) in November to a wintry 36°F (2.2°C). Merrillville experiences an average low-temperature of 26.6°F (-3°C) in month of December.Humidity
In Merrillville, Indiana, the average relative humidity in December is 81%.Rainfall
In Merrillville, in December, during 7.7 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. Throughout the year, in Merrillville, Indiana, there are 146.6 rainfall days, and 23.31" (592mm) of precipitation is accumulated.Snowfall
Months with snowfall in Merrillville, Indiana, are January through April, October through December. In Merrillville, during December, snow falls for 9.9 days and regularly aggregates up to 2.2" (56mm) of snow. Throughout the year, there are 45.5 snowfall days, and 12.64" (321mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 12min of daylight.On the first day of December in Merrillville, sunrise is at 6:56 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:29 pm CST.
Sunshine
In December, the average sunshine is 3.9h.UV index
The months with the lowest UV index in Merrillville are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 1 during December translates into the following recommendations:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Frequently asked questions
How cold is it in Merrillville in December?
What is the average humidity in December in Merrillville?
How much does it rain in Merrillville in December?
How many days does it snow in December in Merrillville?
What is the month with the shortest days in Merrillville?
What is the average length of the day in December in Merrillville?
When are sunrise and sunset in December in Merrillville?
How many hours of sunshine does Merrillville have in December?
When is the lowest UV index in Merrillville?
How high is the UV index in December in Merrillville?
Average temperature in December
Merrillville, IN
- Average high temperature in December: 36°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (30°F).
- Average low temperature in December: 26.6°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 (18.9°F).
Average pressure in December
Merrillville, IN
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Merrillville, IN
- Average wind speed in December: 9.6mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in December
Merrillville, IN
- Average humidity in December: 81%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Merrillville, IN
- Average rainfall in December: 1.1"
The wettest month (with the highest rainfall) is June (3.15").
The driest month (with the least rainfall) is November (1.06").
Average rainfall days in December
Merrillville, IN
- Average rainfall days in December: 7.7 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in December
Merrillville, IN
- Average snowfall in December: 2.2"
The month with the highest snowfall is February (3.5").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Merrillville, IN
- Average snowfall days in December: 9.9 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Merrillville, IN
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Merrillville, IN
- Average sunshine days in December: 15.7 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is July (10.2 days).
Average UV index in December
Merrillville, IN
- 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
Merrillville, IN
- Average cloud cover in December: 60
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in December
Merrillville, IN
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and July (5mi).
Merrillville, Indiana, USA
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