December weather forecastPreston, IA
December
Weather in December
The first month of the winter, December, is also an icy month in Preston, Iowa, with an average temperature varying between 32.7°F (0.4°C) and 22.3°F (-5.4°C).Temperature
Preston's December weather features a mild decline in high-temperatures, reducing from a frosty 45°F (7.2°C) in November to an icy 32.7°F (0.4°C). Preston's average low-temperature is measured at a freezing cold 22.3°F (-5.4°C) during December.Humidity
In Preston, the average relative humidity in December is 82%.Rainfall
In Preston, in December, during 6.9 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In Preston, during the entire year, the rain falls for 143.3 days and collects up to 29.76" (756mm) of precipitation.Snowfall
Months with snowfall in Preston are January through April, October through December. In December, it is snowing for 8.3 days. Throughout December, 2.6" (66mm) of snow is accumulated. In Preston, during the entire year, snow falls for 40.2 days and aggregates up to 17.48" (444mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:10 am and sunset at 4:30 pm. On the last day of December, sunrise is at 7:29 am and sunset at 4:40 pm CST.
Sunshine
In Preston, 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 reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 1 during December leads to these instructions:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. To guard against the harmful effects of the Sun, minimize exposure during midday. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Preston, IA
- Average high temperature in December: 32.7°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (25.9°F).
- Average low temperature in December: 22.3°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).
Average pressure in December
Preston, 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
Preston, IA
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in December
Preston, IA
- Average humidity in December: 82%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Preston, IA
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is May (4.53").
The driest month (with the least rainfall) is January (1.34").
Average rainfall days in December
Preston, IA
- Average rainfall days in December: 6.9 days
The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in December
Preston, IA
- Average snowfall in December: 2.6"
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
Preston, IA
- Average snowfall days in December: 8.3 days
The month with the highest number of snowfall days is January (11 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
Preston, IA
- Average daylight in December: 9h and 12min
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 12min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The months with the least sunshine are January and February (Average sunshine: 3h and 54min).
Average sunshine days in December
Preston, IA
- Average sunshine days in December: 17.2 days
The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is May (10.2 days).
Average UV index in December
Preston, IA
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Preston, IA
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility in December
Preston, 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).
