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
A shift in Harper's weather is observed as November turns into December, with the average high temperature reducing from a frosty 46.9°F (8.3°C) to an icy 34.7°F (1.5°C). The nighttime temperature in Harper, Iowa, during December, averages of 23.4°F (-4.8°C).Humidity
In Harper, the average relative humidity in December is 80%.Rainfall
In Harper, in December, during 6.8 rainfall days, 1.18" (30mm) of precipitation is typically accumulated. In Harper, during the entire year, the rain falls for 137.9 days and collects up to 27.76" (705mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In December, in Harper, it is snowing for 6.5 days. Throughout December, 1.34" (34mm) of snow is accumulated. Throughout the year, in Harper, there are 32.8 snowfall days, and 12.56" (319mm) of snow is accumulated.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 7:15 am and sunset at 4:39 pm. On the last day of December, sunrise is at 7:34 am and sunset at 4:48 pm CST.
Sunshine
In Harper, the average sunshine in December is 4.6h.UV index
The months with the lowest UV index in Harper, Iowa, are January, February, October through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily maximum UV index of 2 in December interprets into the following advice:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Avoiding the Sun during its peak radiation time around midday is a healthy practice. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Frequently asked questions
How cold is it in Harper in December?
What is the average humidity in December in Harper?
How many days does it rain in December in Harper?
How much does it snow in Harper in December?
What is the month with the shortest days in Harper?
What is the average length of the day in December in Harper?
What time are sunrise and sunset in December in Harper?
How long on average sun shines in December in Harper?
What are the months with the lowest UV index in Harper?
What is the UV index intensity in December in Harper?
Average temperature in December
Harper, IA
- Average high temperature in December: 34.7°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (28.6°F).
- Average low temperature in December: 23.4°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 (15.6°F).
Average pressure in December
Harper, IA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Harper, IA
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity in December
Harper, IA
- Average humidity in December: 80%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Harper, IA
- Average rainfall in December: 1.18"
The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in December
Harper, IA
- Average rainfall days in December: 6.8 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (4.9 days).
Average snowfall in December
Harper, IA
- Average snowfall in December: 1.34"
The month with the highest snowfall is January (4.06").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Harper, IA
- Average snowfall days in December: 6.5 days
The month with the highest number of snowfall days is January (9.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Harper, IA
- Average daylight in December: 9h and 1min
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 12min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in December
Harper, IA
- Average sunshine days in December: 19.1 days
The month with the most sunshine days is December (19.1 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in December
Harper, IA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in December
Harper, IA
- Average cloud cover in December: 52
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are August and September (Cloud cover 29).
Average visibility in December
Harper, IA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Harper, Iowa, USA
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