December weather forecastSaint Olaf, IA
December
Weather in December
The first month of the winter, December, is also a subzero cold month in Saint Olaf, Iowa, with an average temperature fluctuating between 19.9°F (-6.7°C) and 30°F (-1.1°C).Temperature
With the onset of December, Saint Olaf experiences a modest temperature adjustment, with the average high-temperature receding from a frosty 43.2°F (6.2°C) in November to a subzero cold 30°F (-1.1°C). December nights observe an average temperature dip to a still freezing cold 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. In Saint Olaf, during the entire year, the rain falls for 138 days and collects up to 29.21" (742mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Saint Olaf, during December, snow falls for 10.5 days and regularly aggregates up to 3.39" (86mm) of snow. In Saint Olaf, during the entire year, snow falls for 48.5 days and aggregates up to 19.76" (502mm) of snow.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 4:32 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:41 pm CST.
Sunshine
In Saint Olaf, 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 estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.Note: In December, the average maximum UV index of 1 translates into the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Enhance your sun protection with tightly woven, yet airy clothing. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Saint Olaf, 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
Saint Olaf, 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
Saint Olaf, 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
Saint Olaf, 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
Saint Olaf, 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
Saint Olaf, 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
Saint Olaf, 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
Saint Olaf, 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
Saint Olaf, 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 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
Saint Olaf, 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
Saint Olaf, 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
Saint Olaf, 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
Saint Olaf, 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).
