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
December's onset corresponds with a shift in the average high-temperature, moving from a frosty 43.7°F (6.5°C) in November to a freezing cold 31.3°F (-0.4°C). The average temperature during December nights dips to a still subzero cold 21°F (-6.1°C).Humidity
In December, the average relative humidity is 82%.Rainfall
December is the month with the least rainfall. Rain falls for 5.9 days and accumulates 0.98" (25mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In O'Neill, in December, snow falls for 11 days, with typically accumulated 3.23" (82mm) of snow. In O'Neill, during the entire year, snow falls for 52.1 days and aggregates up to 16.54" (420mm) of snow.Daylight
December has the shortest days of the year in O'Neill, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:14 am and sunset at 4:31 pm. On the last day of December, sunrise is at 7:33 am and sunset at 4:40 pm CST.
Sunshine
In December, the average sunshine is 3.8h.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 value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In December, an average UV index of 1 transforms into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in O'Neill?
What is the average humidity in December in O'Neill?
What is the driest month?
How many days does it rain in December?
How much does it snow in O'Neill in December?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
How many hours of sunshine does O'Neill have in December?
When is the lowest UV index in O'Neill?
What is the UV index reading in December?
Average temperature in December
O'Neill, IA
- Average high temperature in December: 31.3°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in December: 21°F
The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (11.7°F).
Average pressure in December
O'Neill, 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
O'Neill, IA
- Average wind speed in December: 9.8mph
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
O'Neill, IA
- Average humidity in December: 82%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (75%).
Average rainfall in December
O'Neill, IA
- Average rainfall in December: 0.98"
The wettest months (with the highest rainfall) are May and June (3.54").
The driest month (with the least rainfall) is December (0.98").
Average rainfall days in December
O'Neill, IA
- Average rainfall days in December: 5.9 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (4.1 days).
Average snowfall in December
O'Neill, IA
- Average snowfall in December: 3.23"
The month with the highest snowfall is January (4.29").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
O'Neill, IA
- Average snowfall days in December: 11 days
The month with the highest number of snowfall days is January (13.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
O'Neill, IA
- Average daylight in December: 9h and 1min
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: 3h and 5min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
O'Neill, IA
- Average sunshine days in December: 17.1 days
The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is May (9.4 days).
Average UV index in December
O'Neill, 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
O'Neill, 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 32).
Average visibility in December
O'Neill, IA
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and July (5mi).
O'Neill, Iowa, USA
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