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
The shift to December brings a decrease in the average high-temperature, falling from a chilly 47.1°F (8.4°C) in November to an icy 33.8°F (1°C). Greenfield, during the month of December, experiences an average low-temperature of 22.1°F (-5.5°C).Humidity
In December, the average relative humidity in Greenfield is 79%.Rainfall
In Greenfield, during December, the rain falls for 5.5 days and regularly aggregates up to 1.3" (33mm) of precipitation. Throughout the year, there are 138.2 rainfall days, and 28.23" (717mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Greenfield, during December, snow falls for 7.5 days and regularly aggregates up to 2.72" (69mm) of snow. In Greenfield, Iowa, during the entire year, snow falls for 35.5 days and aggregates up to 15.71" (399mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year in Greenfield.On the first day of December in Greenfield, sunrise is at 7:24 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 4:58 pm CST.
Sunshine
In Greenfield, the average sunshine in December is 4.9h.UV index
The average daily maximum UV index in December in Greenfield is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the average person.Note: A daily maximum UV index of 2 in December translates into the following instructions:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Boost your sun resistance with garments that are densely woven yet spacious. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Greenfield?
What is the average humidity in December in Greenfield?
How many days does it rain in December in Greenfield?
How many days does it snow in December in Greenfield?
What is the month with the shortest days in Greenfield?
How many hours of daylight does Greenfield have in December?
When is the sunrise / sunset in December in Greenfield?
How long on average sun shines in December in Greenfield?
What is the UV index intensity in December in Greenfield?
Average temperature in December
Greenfield, 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 (28.4°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 (14.9°F).
Average pressure in December
Greenfield, IA
- Average pressure in December: 30.13"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
Greenfield, IA
- Average wind speed in December: 10.3mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in December
Greenfield, IA
- Average humidity in December: 79%
The months with the highest relative humidity are January, February and June (82%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Greenfield, IA
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is June (4.49").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days in December
Greenfield, IA
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is June (18.5 days).
The month with the least rainy days is January (4 days).
Average snowfall in December
Greenfield, IA
- Average snowfall in December: 2.72"
The month with the highest snowfall is February (4.41").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Greenfield, IA
- Average snowfall days in December: 7.5 days
The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Greenfield, IA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in December
Greenfield, IA
- Average sunshine days in December: 19.4 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is June (9.6 days).
Average UV index in December
Greenfield, IA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Greenfield, IA
- Average cloud cover in December: 48
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in December
Greenfield, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Greenfield, Iowa, USA
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