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 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
Rochester experiences a recorded average high-temperature of a still refreshing 64°F (17.8°C) in January, closely aligned with December's 61.7°F (16.5°C). Rochester witnesses a consistent average low-temperature of 46.2°F (7.9°C) throughout January.Humidity
In Rochester, the average relative humidity in January is 49%.Rainfall
In Rochester, in January, during 4.6 rainfall days, 0.51" (13mm) of precipitation is typically accumulated. In Rochester, during the entire year, the rain falls for 42.3 days and collects up to 4.53" (115mm) of precipitation.Snowfall
January, March through December are months without snowfall in Rochester.Daylight
In January, the average length of the day in Rochester is 10h and 11min.On the first day of the month, sunrise is at 6:55 am and sunset at 4:51 pm. On the last day of January, sunrise is at 6:47 am and sunset at 5:19 pm PST.
Sunshine
The average sunshine in January is 7h.UV index
In Rochester, the average daily maximum UV index in January is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index of 4 during January leads to these instructions:
Guard yourself - Precautionary measures against sun damage are advocated. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average January temperature in Rochester?
What is the average humidity in January in Rochester?
How many days does it rain in January in Rochester?
When it does not snow in Rochester?
Does it snow in Rochester in January?
How many hours of daylight does Rochester have in January?
When is the sunrise / sunset in January in Rochester?
How many hours of sunshine does Rochester have in January?
How high is the UV index in January in Rochester?
Average temperature in January
Rochester, CA
- Average high temperature in January: 64°F
The warmest month (with the highest average high temperature) is August (91.8°F).
The month with the lowest average high temperature is December (61.7°F).
- Average low temperature in January: 46.2°F
The month with the highest average low temperature is August (66.6°F).
The coldest months (with the lowest average low temperature) are February and December (45.3°F).
Average pressure in January
Rochester, CA
- Average pressure in January: 30.1"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in January
Rochester, CA
- Average wind speed in January: 5.3mph
The windiest month (with the highest average wind speed) is May (5.9mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).
Average humidity in January
Rochester, CA
- Average humidity in January: 49%
The months with the highest relative humidity are February, March and May (53%).
The month with the lowest relative humidity is August (41%).
Average rainfall in January
Rochester, CA
- Average rainfall in January: 0.51"
The wettest month (with the highest rainfall) is February (0.98").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in January
Rochester, CA
- Average rainfall days in January: 4.6 days
The month with the highest number of rainy days is March (6.3 days).
The month with the least rainy days is June (0.9 days).
Average snowfall days in January
Rochester, CA
- Average snowfall days in January: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in January /
Average sunshine in January
Rochester, CA
- Average daylight in January: 10h and 1min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in January: 7h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).
Average sunshine days in January
Rochester, CA
- Average sunshine days in January: 25.8 days
The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (22.8 days).
Average UV index in January
Rochester, CA
- Average UV index in January: 4
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in January
Rochester, CA
- Average cloud cover in January: 19
The months with the most cloud cover are February and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in January
Rochester, CA
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Rochester, California, USA
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