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
Hammond observes a minor decrease in the average high-temperature with the arrival of December, falling from November's chilly 49.5°F (9.7°C) to a cold 38.3°F (3.5°C). December nights experience a consistent temperature drop to a subzero cold 27.7°F (-2.4°C).Humidity
In Hammond, the average relative humidity in December is 79%.Rainfall
In Hammond, in December, during 8.4 rainfall days, 1.18" (30mm) of precipitation is typically accumulated. In Hammond, during the entire year, the rain falls for 143.6 days and collects up to 21.57" (548mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In December, it is snowing for 6.9 days. Throughout December, 1.38" (35mm) of snow is accumulated. Throughout the year, there are 28.9 snowfall days, and 7.01" (178mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in Hammond, Illinois.On the first day of December, sunrise is at 6:57 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:39 pm CST.
Sunshine
In December, the average sunshine is 4.5h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 2 during December leads to these advisories:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. To protect against the Sun's most potent rays, avoid direct exposure around midday. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in December?
What is the average humidity in December?
How many days does it rain in December in Hammond?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December in Hammond?
How many hours of sunshine does Hammond have in December?
What is the month with the lowest UV index?
How high is the UV index in December in Hammond?
Average temperature in December
Hammond, IL
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in December: 27.7°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 (20.8°F).
Average pressure in December
Hammond, IL
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Hammond, IL
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in December
Hammond, IL
- Average humidity in December: 79%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Hammond, IL
- Average rainfall in December: 1.18"
The wettest months (with the highest rainfall) are April and May (2.56").
The driest month (with the least rainfall) is September (1.14").
Average rainfall days in December
Hammond, IL
- Average rainfall days in December: 8.4 days
The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is February (6.5 days).
Average snowfall in December
Hammond, IL
- Average snowfall in December: 1.38"
The month with the highest snowfall is January (2.28").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Hammond, IL
- Average snowfall days in December: 6.9 days
The month with the highest number of snowfall days is January (9.3 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
Hammond, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 3min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in December
Hammond, IL
- Average sunshine days in December: 16.1 days
The months with the most sunshine days are October and November (18.1 days).
The month with the least sunshine days is July (10.5 days).
Average UV index in December
Hammond, IL
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Hammond, IL
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are June and September (Cloud cover 31).
Average visibility in December
Hammond, IL
- 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).
Hammond, Illinois, USA
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