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
With December's onset, the weather shows a temperature decrease, transitioning from a chilly 46.9°F (8.3°C) in November to a wintry 33.8°F (1°C). In December, Grimes encounters an average low-temperature of 22.1°F (-5.5°C) during the night.Humidity
The average relative humidity in December is 79%.Rainfall
In Grimes, during December, the rain falls for 3.8 days and regularly aggregates up to 0.55" (14mm) of precipitation. Throughout the year, there are 114.6 rainfall days, and 15.51" (394mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Grimes, in December, during 5.5 snowfall days, 0.83" (21mm) of snow is typically accumulated. In Grimes, during the entire year, snow falls for 29.6 days and aggregates up to 6.77" (172mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:23 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 4:54 pm CST.
Sunshine
In December, the average sunshine is 4.8h.UV index
In Grimes, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum high daily UV index of 2 during December translates into the following directions:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Grimes have in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
What is the UV index reading in December?
Average temperature in December
Grimes, IA
- Average high temperature in December: 33.8°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in December: 22.1°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 (14.4°F).
Average pressure in December
Grimes, IA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Grimes, IA
- Average wind speed in December: 9.9mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in December
Grimes, IA
- Average humidity in December: 79%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Grimes, IA
- Average rainfall in December: 0.55"
The wettest months (with the highest rainfall) are May and June (2.52").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in December
Grimes, IA
- Average rainfall days in December: 3.8 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (3.5 days).
Average snowfall in December
Grimes, IA
- Average snowfall in December: 0.83"
The month with the highest snowfall is January (2.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Grimes, IA
- Average snowfall days in December: 5.5 days
The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Grimes, 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 5min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in December
Grimes, IA
- Average sunshine days in December: 22.8 days
The month with the most sunshine days is December (22.8 days).
The month with the least sunshine days is June (11.2 days).
Average UV index in December
Grimes, IA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Grimes, IA
- Average cloud cover in December: 49
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is September (Cloud cover 28).
Average visibility in December
Grimes, IA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Grimes, Iowa, USA
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