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
Gary in December demonstrates a small temperature transition, adjusting from an average high of a frosty 46.6°F (8.1°C) in November to a cold 36.1°F (2.3°C). December nights anticipate an average temperature of 27.3°F (-2.6°C), a modest decline from the daytime.Humidity
In December, the average relative humidity is 80%.Rainfall
December is the month with the least rainfall. Rain falls for 8.7 days and accumulates 1.1" (28mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In December, it is snowing for 9.6 days. Throughout December, 1.93" (49mm) of snow is accumulated. Throughout the year, there are 45.1 snowfall days, and 12.36" (314mm) of snow is accumulated.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:57 am and sunset at 4:20 pm. On the last day of December, sunrise is at 7:15 am and sunset at 4:29 pm CST.
Sunshine
In Gary, the average sunshine in December is 4h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.Note: In December, a regular UV index of 1 translates into these guidelines:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. During bright days, sunglasses that offer UVA and UVB defense are recommended. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
What is the driest month?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Gary have in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Gary, IN
- Average high temperature in December: 36.1°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (30°F).
- Average low temperature in December: 27.3°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
Gary, 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
Gary, IN
- Average wind speed in December: 10.6mph
The windiest month (with the highest average wind speed) is January (11.4mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in December
Gary, IN
- Average humidity in December: 80%
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Gary, IN
- Average rainfall in December: 1.1"
The wettest month (with the highest rainfall) is June (3.66").
The driest month (with the least rainfall) is December (1.1").
Average rainfall days in December
Gary, IN
- Average rainfall days in December: 8.7 days
The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in December
Gary, IN
- Average snowfall in December: 1.93"
The month with the highest snowfall is January (3.11").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Gary, IN
- Average snowfall days in December: 9.6 days
The month with the highest number of snowfall days is January (13.4 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
Gary, 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: 4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Gary, IN
- Average sunshine days in December: 15.1 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is July (9.8 days).
Average UV index in December
Gary, IN
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Gary, IN
- 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 28).
Average visibility in December
Gary, IN
- 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).
Gary, Indiana, USA
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