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
A shift in Garnavillo's weather is observed as November turns into December, with the average high temperature reducing from a frosty 43.2°F (6.2°C) to a freezing cold 30°F (-1.1°C). During December, the average low-temperature in Garnavillo is 19.9°F (-6.7°C).Humidity
In December, the average relative humidity is 83%.Rainfall
In December, the rain falls for 5.2 days. Throughout December, 1.5" (38mm) of precipitation is accumulated. Throughout the year, there are 138 rainfall days, and 29.21" (742mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Garnavillo. In Garnavillo, in December, during 10.5 snowfall days, 3.39" (86mm) of snow is typically accumulated. Throughout the year, there are 48.5 snowfall days, and 19.76" (502mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 7:16 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 4:40 pm CST.
Sunshine
In Garnavillo, the average sunshine in December is 4.1h.UV index
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.Note: The UV index of 1 during December translates into the following guidance:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Frequently asked questions
How cold is it in Garnavillo in December?
What is the average humidity in December in Garnavillo?
How much does it rain in Garnavillo in December?
How many days does it snow in December in Garnavillo?
What is the month with the shortest days in Garnavillo?
How many hours of daylight does Garnavillo have in December?
What time are sunrise and sunset in December in Garnavillo?
How many hours of sunshine does Garnavillo have in December?
When is the lowest UV index in Garnavillo?
What is the UV index reading in December in Garnavillo?
Average temperature in December
Garnavillo, IA
- Average high temperature in December: 30°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (23.5°F).
- Average low temperature in December: 19.9°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (10.9°F).
Average pressure in December
Garnavillo, 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 (29.89"Hg).
Average wind speed in December
Garnavillo, IA
- Average wind speed in December: 9.6mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in December
Garnavillo, IA
- Average humidity in December: 83%
The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is October (75%).
Average rainfall in December
Garnavillo, IA
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is June (4.25").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in December
Garnavillo, IA
- Average rainfall days in December: 5.2 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is February (3.6 days).
Average snowfall in December
Garnavillo, IA
- Average snowfall in December: 3.39"
The month with the highest snowfall is January (5.04").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Garnavillo, IA
- Average snowfall days in December: 10.5 days
The month with the highest number of snowfall days is January (11.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Garnavillo, IA
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Garnavillo, IA
- Average sunshine days in December: 16.9 days
The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is June (8.9 days).
Average UV index in December
Garnavillo, IA
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Garnavillo, IA
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in December
Garnavillo, IA
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
Garnavillo, Iowa, USA
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