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
Onset of December witnesses a reduction in the average high-temperature, falling from a chilly 45.7°F (7.6°C) in November to a cold 33.4°F (0.8°C). Throughout the nights in December, an average low-temperature of 22.6°F (-5.2°C) is noted.Humidity
In Grand Mound, the average relative humidity in December is 82%.Rainfall
In December, the rain falls for 7.3 days. Throughout December, 1.38" (35mm) of precipitation is accumulated. Throughout the year, there are 142.1 rainfall days, and 28.35" (720mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In Grand Mound, in December, during 8.5 snowfall days, 2.28" (58mm) of snow is typically accumulated. In Grand Mound, during the entire year, snow falls for 39.7 days and aggregates up to 15.67" (398mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:11 am and sunset at 4:32 pm. On the last day of December, sunrise is at 7:29 am and sunset at 4:41 pm CST.
Sunshine
The average sunshine in December is 4.3h.UV index
In Grand Mound, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 2 during December leads to these advisories:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days in Grand Mound?
How many hours of daylight does Grand Mound have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Grand Mound have in December?
How high is the UV index in December?
Average temperature in December
Grand Mound, IA
- Average high temperature in December: 33.4°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (26.6°F).
- Average low temperature in December: 22.6°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).
Average pressure in December
Grand Mound, IA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Grand Mound, IA
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in December
Grand Mound, IA
- Average humidity in December: 82%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Grand Mound, IA
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is May (4.61").
The driest month (with the least rainfall) is February (1.26").
Average rainfall days in December
Grand Mound, IA
- Average rainfall days in December: 7.3 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in December
Grand Mound, IA
- Average snowfall in December: 2.28"
The month with the highest snowfall is January (5.2").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Grand Mound, IA
- Average snowfall days in December: 8.5 days
The month with the highest number of snowfall days is January (11.5 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
Grand Mound, IA
- Average daylight in December: 9h and 1min
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 12min).
- Average sunshine in December: 4h and 2min
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
Grand Mound, IA
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in December
Grand Mound, IA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Grand Mound, IA
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Grand Mound, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
Grand Mound, Iowa, USA
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