December weather forecastSaint Mary, KY
December
Weather in December
The first month of the winter, December, is also a frosty month in Saint Mary, Kentucky, with an average temperature varying between 45.1°F (7.3°C) and 33.1°F (0.6°C).Temperature
December's onset brings a slight change in high-temperatures, falling from a fresh 54.1°F (12.3°C) in November to a frosty 45.1°F (7.3°C). In Saint Mary, the average low-temperature during the month of December is a cold 33.1°F (0.6°C).Humidity
The months with the highest humidity are February and December, with an average relative humidity of 80%.Rainfall
In Saint Mary, during December, the rain falls for 12.2 days and regularly aggregates up to 2.56" (65mm) of precipitation. Throughout the year, there are 163.3 rainfall days, and 32.09" (815mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In Saint Mary, in December, snow falls for 5 days, with typically accumulated 1.06" (27mm) of snow. In Saint Mary, during the entire year, snow falls for 27.3 days and aggregates up to 7.91" (201mm) of snow.Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year.On the first day of December in Saint Mary, sunrise is at 7:38 am and sunset at 5:23 pm. On the last day of the month, sunrise is at 7:56 am and sunset at 5:33 pm EST.
Sunshine
The average sunshine in December in Saint Mary is 4.4h.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 low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In December, a daily UV index of 2 turns into the following recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Saint Mary, KY
- Average high temperature in December: 45.1°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (39.9°F).
- Average low temperature in December: 33.1°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (27.1°F).
Average pressure in December
Saint Mary, KY
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in December
Saint Mary, KY
- Average wind speed in December: 7.8mph
The windiest months (with the highest average wind speed) are January and February (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity in December
Saint Mary, KY
- Average humidity in December: 80%
The months with the highest relative humidity are February and December (80%).
The month with the lowest relative humidity is October (75%).
Average rainfall in December
Saint Mary, KY
- Average rainfall in December: 2.56"
The wettest month (with the highest rainfall) is July (3.27").
The driest month (with the least rainfall) is September (2.13").
Average rainfall days in December
Saint Mary, KY
- Average rainfall days in December: 12.2 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is November (9.6 days).
Average snowfall in December
Saint Mary, KY
- Average snowfall in December: 1.06"
The month with the highest snowfall is February (2.17").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Saint Mary, KY
- Average snowfall days in December: 5 days
The month with the highest number of snowfall days is January (7.8 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
Saint Mary, KY
- Average daylight in December: 9h and 36min
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 36min).
- Average sunshine in December: 4h and 24min
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 18min).
Average sunshine days in December
Saint Mary, KY
- Average sunshine days in December: 14.6 days
The month with the most sunshine days is October (18.2 days).
The month with the least sunshine days is July (11 days).
Average UV index in December
Saint Mary, KY
- Average UV index in December: 2
The months with the highest UV index are May, 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
Saint Mary, KY
- Average cloud cover in December: 55
The months with the most cloud cover are January and February (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Saint Mary, KY
- Average visibility in December: 6mi
The months with the highest visibility are March, April, June, August, October, November and December (6mi).
The months with the lowest visibility are January, February, May, July and September (5mi).
