December weather forecastGreencastle, IN
December
Weather in December
Winter arrives in full force in December, dressing Greencastle in a white winter blanket. The city experiences increased snowfall at 1.22" (31mm) and reintroduces snowflakes drifting through the biting chill. With cloudy skies, the sunlight is often muted, and daylight hours reduce to 9.4. Despite the cold weather, Greencastle holds onto its charm, creating an enchanting winter wonderland. As the year concludes, citizens celebrate the festive season in a snowy cityscape.Temperature
With the beginning of December, the average high-temperature shows a decrease, transitioning from a frosty 49.3°F (9.6°C) in November to an icy 38.7°F (3.7°C). In Greencastle, the December nights cool down to an average low of 28.2°F (-2.1°C).Humidity
In December, the average relative humidity in Greencastle is 82%.Rainfall
In Greencastle, in December, it is raining for 6.6 days, with typically 0.94" (24mm) of accumulated precipitation. Throughout the year, there are 118.9 rainfall days, and 12.13" (308mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. The month with the most snowfall is December, when snow falls for 5.3 days and typically aggregates up to 1.22" (31mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:49 am and sunset at 5:23 pm. On the last day of December, sunrise is at 8:08 am and sunset at 5:33 pm EST.
Sunshine
In December, the average sunshine is 4.3h.UV index
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Greencastle, IN
- Average high temperature in December: 38.7°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (33.6°F).
- Average low temperature in December: 28.2°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure in December
Greencastle, IN
- 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 (29.93"Hg).
Average wind speed in December
Greencastle, IN
- Average wind speed in December: 9.1mph
The windiest months (with the highest average wind speed) are January and February (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).
Average humidity in December
Greencastle, IN
- Average humidity in December: 82%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Greencastle, IN
- Average rainfall in December: 0.94"
The wettest month (with the highest rainfall) is May (1.5").
The driest month (with the least rainfall) is September (0.67").
Average rainfall days in December
Greencastle, IN
- Average rainfall days in December: 6.6 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is February (6.4 days).
Average snowfall in December
Greencastle, IN
- Average snowfall in December: 1.22"
The month with the highest snowfall is December (1.22").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Greencastle, IN
- Average snowfall days in December: 5.3 days
The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Greencastle, IN
- Average daylight in December: 9h and 24min
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 18min
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 12min).
Average sunshine days in December
Greencastle, IN
- Average sunshine days in December: 21 days
The month with the most sunshine days is December (21 days).
The month with the least sunshine days is May (12.1 days).
Average UV index in December
Greencastle, IN
- 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, October, November and December (UV index 2).
Average cloud cover in December
Greencastle, IN
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in December
Greencastle, IN
- 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).
