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
The high-temperature average in January for Rochester is a chilly 44.8°F (7.1°C), staying closely aligned with December's conditions. In Rochester, the nighttime temperature averages to an icy 34.2°F (1.2°C) during January.Humidity
In Rochester, Washington, the average relative humidity in January is 89%.Rainfall
The month with the most rainfall in Rochester is January, when the rain falls for 17.8 days and typically aggregates up to 3.86" (98mm) of precipitation.Snowfall
Months with snowfall are January through March, November and December. In January, in Rochester, it is snowing for 1.8 days. Throughout January, 1.22" (31mm) of snow is accumulated. In Rochester, Washington, during the entire year, snow falls for 7.9 days and aggregates up to 4.02" (102mm) of snow.Daylight
The average length of the day in January is 9h and 3min.On the first day of the month, sunrise is at 7:57 am and sunset at 4:34 pm. On the last day of January, in Rochester, sunrise is at 7:37 am and sunset at 5:13 pm PST.
Sunshine
In January, the average sunshine in Rochester is 3.6h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Rochester, Washington. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: In January, a daily UV index of 2 turns into the following recommendations:
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 around mid-day is intense; avoid the Sun and stay safe. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Frequently asked questions
What is the usual temperature for Rochester in January?
What is the average humidity in January in Rochester?
What is the wettest month in Rochester?
How many days does it rain in January in Rochester?
How many days does it snow in January in Rochester?
What is the average length of the day in January in Rochester?
When are sunrise and sunset in January in Rochester?
How long on average sun shines in January in Rochester?
What are the months with the lowest UV index in Rochester?
What is the UV index reading in January in Rochester?
Average temperature in January
Rochester, WA
- Average high temperature in January: 44.8°F
The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is December (42.6°F).
- Average low temperature in January: 34.2°F
The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (33.1°F).
Average pressure in January
Rochester, WA
- Average pressure in January: 30.09"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.02"Hg).
Average wind speed in January
Rochester, WA
- Average wind speed in January: 4.5mph
The windiest months (with the highest average wind speed) are January, March and November (4.5mph).
The calmest month (with the lowest average wind speed) is September (3.6mph).
Average humidity in January
Rochester, WA
- Average humidity in January: 89%
The month with the highest relative humidity is November (90%).
The month with the lowest relative humidity is July (73%).
Average rainfall in January
Rochester, WA
- Average rainfall in January: 3.86"
The wettest month (with the highest rainfall) is January (3.86").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in January
Rochester, WA
- Average rainfall days in January: 17.8 days
The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (5.6 days).
Average snowfall in January
Rochester, WA
- Average snowfall in January: 1.22"
The month with the highest snowfall is February (1.54").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in January
Rochester, WA
- Average snowfall days in January: 1.8 days
The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Rochester, WA
- Average daylight in January: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in January: 3h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is December (Average sunshine: 3h and 30min).
Average sunshine days in January
Rochester, WA
- Average sunshine days in January: 10.7 days
The month with the most sunshine days is August (20.9 days).
The months with the least sunshine days are February and March (9.3 days).
Average UV index in January
Rochester, WA
- Average UV index in January: 2
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in January
Rochester, WA
- Average cloud cover in January: 66
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 38).
Average visibility in January
Rochester, WA
- Average visibility in January: 4mi
The month with the highest visibility is July (5mi).
The months with the lowest visibility are January, February, March, April, May, June, August, September, October, November and December (4mi).
Rochester, Washington, USA
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