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 start of December signals a decrease in the average high-temperature, transitioning from a mild 55.4°F (13°C) in November to a chilly 45.7°F (7.6°C). Throughout December, Massac witnesses a nighttime temperature average of 34.2°F (1.2°C).Humidity
In December, the average relative humidity is 77%.Rainfall
In Massac, during December, the rain falls for 8.5 days and regularly aggregates up to 1.65" (42mm) of precipitation. Throughout the year, there are 137 rainfall days, and 22.64" (575mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In December, it is snowing for 1.5 days. Throughout December, 0.2" (5mm) of snow is accumulated. Throughout the year, there are 8.9 snowfall days, and 2.32" (59mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 42min of daylight.On the first day of December, sunrise is at 6:50 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 4:48 pm CST.
Sunshine
In Massac, the average sunshine in December is 5h.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The average daily UV index of 2 in December transforms into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are December temperatures?
What is the average humidity in December?
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 Massac have in December?
When are sunrise and sunset in December?
How long on average sun shines in December in Massac?
What are the months with the lowest UV index in Massac?
How high is the UV index in December?
Average temperature in December
Massac, KY
- Average high temperature in December: 45.7°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (41.5°F).
- Average low temperature in December: 34.2°F
The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (28.4°F).
Average pressure in December
Massac, KY
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Massac, KY
- Average wind speed in December: 8.5mph
The windiest month (with the highest average wind speed) is January (9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in December
Massac, KY
- Average humidity in December: 77%
The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (69%).
Average rainfall in December
Massac, KY
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is April (2.52").
The driest month (with the least rainfall) is September (0.91").
Average rainfall days in December
Massac, KY
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is January (8.1 days).
Average snowfall in December
Massac, KY
- Average snowfall in December: 0.2"
The month with the highest snowfall is February (1.02").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Massac, KY
- Average snowfall days in December: 1.5 days
The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Massac, KY
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 5h and 0min
The months with the most sunshine are June and July (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 4h and 42min).
Average sunshine days in December
Massac, KY
- Average sunshine days in December: 20.1 days
The month with the most sunshine days is October (21.3 days).
The month with the least sunshine days is May (12.8 days).
Average UV index in December
Massac, KY
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in December
Massac, KY
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are June and September (Cloud cover 27).
Average visibility in December
Massac, KY
- 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).
Massac, Kentucky, USA
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