December weather forecastGrundy Center, IA
December
Weather in December
December, the first month of the winter in Grundy Center, is also a subzero cold month, with an average temperature ranging between max 31.1°F (-0.5°C) and min 20.5°F (-6.4°C).Temperature
In Grundy Center, the average high-temperature in December drops from a frosty 44.6°F (7°C) in November to a freezing cold 31.1°F (-0.5°C). Throughout December, the temperature falls to an average low of 20.5°F (-6.4°C).Humidity
The average relative humidity in December in Grundy Center is 82%.Rainfall
In Grundy Center, during December, the rain falls for 5.7 days and regularly aggregates up to 1.42" (36mm) of precipitation. Throughout the year, there are 137.9 rainfall days, and 28.62" (727mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Grundy Center, in December, snow falls for 8.8 days, with typically accumulated 2.83" (72mm) of snow. Throughout the year, there are 42.6 snowfall days, and 17.36" (441mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 7:21 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 4:48 pm CST.
Sunshine
In Grundy Center, the average sunshine in December is 4.4h.UV index
The months with the lowest UV index in Grundy Center, Iowa, are January and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: A maximum daily UV index of 1 during December morphs into the following directions:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Stay sun-safe with clothing that is both closely woven and worn loosely. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Grundy Center, IA
- Average high temperature in December: 31.1°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (24.8°F).
- Average low temperature in December: 20.5°F
The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (12.2°F).
Average pressure in December
Grundy Center, IA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Grundy Center, IA
- Average wind speed in December: 10.3mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in December
Grundy Center, IA
- Average humidity in December: 82%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Grundy Center, IA
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is May (4.45").
The driest month (with the least rainfall) is January (1.02").
Average rainfall days in December
Grundy Center, IA
- Average rainfall days in December: 5.7 days
The month with the highest number of rainy days is June (18.6 days).
The month with the least rainy days is February (3.6 days).
Average snowfall in December
Grundy Center, IA
- Average snowfall in December: 2.83"
The month with the highest snowfall is February (4.92").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Grundy Center, IA
- Average snowfall days in December: 8.8 days
The month with the highest number of snowfall days is January (10.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Grundy Center, IA
- Average daylight in December: 9h and 6min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 24min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Grundy Center, IA
- Average sunshine days in December: 18.5 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is June (9.3 days).
Average UV index in December
Grundy Center, IA
- Average UV index in December: 1
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Grundy Center, IA
- Average cloud cover in December: 54
The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility in December
Grundy Center, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
