Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
Rock Island starts January with an average high-temperature of a still cold 33.1°F (0.6°C), a minor shift from December's 32.4°F (0.2°C). In Rock Island, the January nights cool down to an average low of 21.6°F (-5.8°C).Humidity
With an average relative humidity of 88%, January is the most humid month.Rainfall
The wettest months are January and December, with an average 1.57" (40mm) of rainfall.Snowfall
January through April, September, November and December are months with snowfall. In Rock Island, in January, during 7.8 snowfall days, 5.2" (132mm) of snow is typically accumulated. In Rock Island, during the entire year, snow falls for 31.6 days and aggregates up to 18.86" (479mm) of snow.Daylight
The average length of the day in January is 8h and 59min.On the first day of January, sunrise is at 7:47 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 5:00 pm PST.
Sunshine
With an average of 4.7h of sunshine, January has the least sunshine of the year.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: A typical high UV index of 2 in January suggests the following recommendations:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in January?
What is the most humid month?
What is the average humidity in January?
What is the wettest month in Rock Island?
How much does it rain in January?
How many days does it snow in January?
What is the average length of the day in January?
When are sunrise and sunset in January in Rock Island?
What is the month with the least sunshine?
How long on average sun shines in January?
What is the month with the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Rock Island, WA
- Average high temperature in January: 33.1°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is December (32.4°F).
- Average low temperature in January: 21.6°F
The month with the highest average low temperature is August (56.3°F).
The coldest month (with the lowest average low temperature) is December (20.7°F).
Average pressure in January
Rock Island, WA
- Average pressure in January: 30.15"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed in January
Rock Island, WA
- Average wind speed in January: 3.8mph
The windiest month (with the highest average wind speed) is June (6.5mph).
The calmest month (with the lowest average wind speed) is December (3.7mph).
Average humidity in January
Rock Island, WA
- Average humidity in January: 88%
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are July and August (44%).
Average rainfall in January
Rock Island, WA
- Average rainfall in January: 1.57"
The wettest months (with the highest rainfall) are January and December (1.57").
The driest months (with the least rainfall) are July and August (0.24").
Average rainfall days in January
Rock Island, WA
- Average rainfall days in January: 11.2 days
The month with the highest number of rainy days is March (13.8 days).
The month with the least rainy days is August (3.8 days).
Average snowfall in January
Rock Island, WA
- Average snowfall in January: 5.2"
The month with the highest snowfall is December (5.98").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in January
Rock Island, WA
- Average snowfall days in January: 7.8 days
The month with the highest number of snowfall days is December (9.5 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in January /
Average sunshine in January
Rock Island, WA
- Average daylight in January: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in January: 4h and 4min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in January
Rock Island, WA
- Average sunshine days in January: 14.5 days
The month with the most sunshine days is July (25.5 days).
The month with the least sunshine days is February (12.6 days).
Average UV index in January
Rock Island, WA
- Average UV index in January: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in January
Rock Island, WA
- Average cloud cover in January: 49
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in January
Rock Island, WA
- Average visibility in January: 4mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).
Rock Island, Washington, USA
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