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
Observing a mild shift, the average high-temperature during December reduces from November's chilly 44.1°F (6.7°C) to a freezing cold 31.1°F (-0.5°C). Nighttime temperatures in December average to a still subzero cold 20.8°F (-6.2°C).Humidity
In Winthrop, the average relative humidity in December is 83%.Rainfall
In Winthrop, during December, the rain falls for 6.6 days and regularly aggregates up to 1.5" (38mm) of precipitation. Throughout the year, there are 140.6 rainfall days, and 30" (762mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Winthrop, during December, snow falls for 10 days and regularly aggregates up to 3.43" (87mm) of snow. Throughout the year, there are 43.9 snowfall days, and 18.43" (468mm) 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 7:17 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:44 pm CST.
Sunshine
In Winthrop, the average sunshine in December is 4.2h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 1 suggests this advice:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
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 many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
How many hours of sunshine does Winthrop have in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Winthrop, IA
- Average high temperature in December: 31.1°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in December: 20.8°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (12.2°F).
Average pressure in December
Winthrop, IA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Winthrop, IA
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in December
Winthrop, IA
- Average humidity in December: 83%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Winthrop, IA
- Average rainfall in December: 1.5"
The wettest months (with the highest rainfall) are May and June (4.37").
The driest month (with the least rainfall) is January (1.14").
Average rainfall days in December
Winthrop, IA
- Average rainfall days in December: 6.6 days
The month with the highest number of rainy days is June (18.8 days).
The month with the least rainy days is January (3.6 days).
Average snowfall in December
Winthrop, IA
- Average snowfall in December: 3.43"
The month with the highest snowfall is January (5.12").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Winthrop, IA
- Average snowfall days in December: 10 days
The month with the highest number of snowfall days is January (11.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Winthrop, 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 6min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Winthrop, IA
- Average sunshine days in December: 17.2 days
The months with the most sunshine days are January, October and November (17.5 days).
The month with the least sunshine days is June (8.2 days).
Average UV index in December
Winthrop, 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 and December (UV index 1).
Average cloud cover in December
Winthrop, IA
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in December
Winthrop, 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).
Winthrop, Iowa, USA
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