December weather forecastStanley, IA
December
Weather in December
The first month of the winter, December, is also a subzero cold month in Stanley, Iowa, with an average temperature varying between 20.1°F (-6.6°C) and 30.4°F (-0.9°C).Temperature
Stanley in December undergoes a mild reduction in the average high-temperature, shifting from November's frosty 43.5°F (6.4°C) to a freezing cold 30.4°F (-0.9°C). In the month of December, the average temperature in Stanley dips to 20.1°F (-6.6°C) during the night.Humidity
In December, the average relative humidity in Stanley is 83%.Rainfall
In Stanley, in December, it is raining for 5.5 days, with typically 1.26" (32mm) of accumulated precipitation. In Stanley, during the entire year, the rain falls for 135.7 days and collects up to 29.65" (753mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Stanley, Iowa, in December, during 8.7 snowfall days, 2.76" (70mm) of snow is typically accumulated. Throughout the year, in Stanley, there are 42.1 snowfall days, and 18.39" (467mm) of snow is accumulated.Daylight
December has the shortest days of the year in Stanley, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 7:18 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 4:43 pm CST.
Sunshine
In Stanley, the average sunshine in December is 4.1h.UV index
The months with the lowest UV index are January, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.Note: A maximum high UV index of 1 in December translates into the following recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. 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
Average temperature in December
Stanley, IA
- Average high temperature in December: 30.4°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 (23.7°F).
- Average low temperature in December: 20.1°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (11.3°F).
Average pressure in December
Stanley, 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
Stanley, IA
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in December
Stanley, IA
- Average humidity in December: 83%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Stanley, IA
- Average rainfall in December: 1.26"
The wettest month (with the highest rainfall) is June (5").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in December
Stanley, IA
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is June (19.4 days).
The month with the least rainy days is January (3.5 days).
Average snowfall in December
Stanley, IA
- Average snowfall in December: 2.76"
The month with the highest snowfall is February (5.08").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Stanley, IA
- Average snowfall days in December: 8.7 days
The month with the highest number of snowfall days is February (10.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Stanley, IA
- Average daylight in December: 9h and 6min
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 6min
The months with the most sunshine are July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Stanley, IA
- Average sunshine days in December: 18.5 days
The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is June (7.8 days).
Average UV index in December
Stanley, IA
- Average UV index in December: 1
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Stanley, IA
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in December
Stanley, 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).
