Climate and monthly weather forecastRochester, WA
Climate and monthly weather forecast
Weather in January
January is a frosty winter month in Rochester, Washington, with an average temperature fluctuating between 44.8°F (7.1°C) and 34.2°F (1.2°C). Rochester's average high-temperature in January sits at a chilly 44.8°F (7.1°C), showing little difference from the previous month. Weather in January »Weather in February
February, the last month of the winter in Rochester, is another chilly month, with an average temperature varying between 33.4°F (0.8°C) and 46.2°F (7.9°C). The transition from January to February brings an average high-temperature of a still frosty 46.2°F (7.9°C), barely different from January's 44.8°F (7.1°C). Weather in February »Weather in March
March, the first month of the spring in Rochester, is a cool month, with an average temperature ranging between min 35.2°F (1.8°C) and max 50.5°F (10.3°C). The average high-temperature during March is a cool 50.5°F (10.3°C), almost matching the conditions of the preceding month. Weather in March »Weather in April
April is a moderate spring month in Rochester, Washington, with an average temperature varying between 56.7°F (13.7°C) and 37.4°F (3°C). Rochester's transition into April is marked by a minor temperature shift, moving from a cool 50.5°F (10.3°C) in March to a refreshing 56.7°F (13.7°C). Weather in April »Weather in May
May, the last month of the spring in Rochester, is an enjoyable month, with an average temperature varying between 41.2°F (5.1°C) and 64.9°F (18.3°C). The shift from April to May introduces a subtle increase in the average high-temperature, moving from a moderate 56.7°F (13.7°C) to a comfortable 64.9°F (18.3°C). Weather in May »Weather in June
The first month of the summer, June, is an agreeable month in Rochester, Washington, with an average temperature ranging between min 45°F (7.2°C) and max 69.8°F (21°C). The beginning of June reveals an average high-temperature of an agreeable 69.8°F (21°C), showing minimal deviation from the previous month. Weather in June »Weather in July
July is a moderately hot summer month in Rochester, Washington, with an average temperature varying between 48.6°F (9.2°C) and 76.6°F (24.8°C). As June transitions into July, Rochester notices a gentle rise in the average high-temperature, transitioning from an agreeable 69.8°F (21°C) to a moderately hot 76.6°F (24.8°C). Weather in July »Weather in August
August, the last month of the summer in Rochester, is another warm month, with an average temperature ranging between min 49.8°F (9.9°C) and max 77.4°F (25.2°C). In Rochester, August is the warmest month, with temperatures averaging a high of 77.4°F (25.2°C) and a low of 49.8°F (9.9°C). Weather in August »Weather in September
The first month of the autumn, September, is still a pleasant month in Rochester, Washington, with an average temperature varying between 70.2°F (21.2°C) and 47.3°F (8.5°C). The beginning of September brings a slight decrease in the average high-temperature, transitioning from a warm 77.4°F (25.2°C) in August to an agreeable 70.2°F (21.2°C). Weather in September »Weather in October
October, like September, is another refreshing autumn month in Rochester, Washington, with an average temperature varying between 58.6°F (14.8°C) and 42.1°F (5.6°C). The beginning of October marks a decrease in the average high-temperature, transitioning from an agreeable 70.2°F (21.2°C) in September to a mild 58.6°F (14.8°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Rochester, Washington, with an average temperature fluctuating between 48.4°F (9.1°C) and 37.9°F (3.3°C). The arrival of November indicates a decrease in the average high-temperature, moving from a mild 58.6°F (14.8°C) in October to a frosty 48.4°F (9.1°C). Weather in November »Weather in December
The first month of the winter, December, is also a wintry month in Rochester, Washington, with an average temperature fluctuating between 33.1°F (0.6°C) and 42.6°F (5.9°C). In Rochester, the month of December is known for its lowest average temperatures, reaching a high of 42.6°F (5.9°C) and a low of 33.1°F (0.6°C). Weather in December »Updated: Aug 4, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
The month with the most rainfall is January, when the rain falls for 17.8 days and typically aggregates up to 3.86" (98mm) of precipitation.
Throughout the year, there are 168 rainfall days, and 23.94" (608mm) of precipitation is accumulated.
Months with snowfall are January through March, November and December.
In Rochester, during the entire year, snow falls for 7.9 days and aggregates up to 4.02" (102mm) of snow.
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
The month with the most snowfall is February, when snow falls for 2.7 days and typically aggregates up to 1.54" (39mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
In Rochester, snow does not fall in April through October.
June has the longest days of the year, with an average of 15h and 48min of daylight.
June and July, with an average maximum UV index of 5, are months with the highest UV index.
The least humid month is July, with an average relative humidity of 73%.
July is the month with the least rainfall. Rain falls for 6.3 days and accumulates 0.35" (9mm) of precipitation.
Rochester experiences its average highest temperatures in August, reaching a peak of 77.4°F (25.2°C) and a minimum of 49.8°F (9.9°C).
The month with the most sunshine is August, with an average of 10.1h of sunshine.
November is the most humid month in Rochester, with an average relative humidity of 90%.
In Rochester, December registers the lowest temperatures, averaging 42.6°F (5.9°C) at the peak and 33.1°F (0.6°C) at the lowest.
December has the shortest days of the year, with an average of 8h and 36min of daylight.
December has the least sunshine of the year, with an average of 3.5h of sunshine.
Average temperature
Rochester, WA
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).
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
Rochester, WA
- Average pressure in January:
30.09"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
30.06"Hg - Average pressure in May:
30.04"Hg - Average pressure in June:
30.04"Hg
- Average pressure in July:
30.06"Hg - Average pressure in August:
30.02"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.04"Hg - Average pressure in December:
30.08"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
Rochester, WA
- Average wind speed in January:
4.5mph - Average wind speed in February:
4.3mph - Average wind speed in March:
4.5mph - Average wind speed in April:
4.4mph - Average wind speed in May:
4mph - Average wind speed in June:
4.2mph
- Average wind speed in July:
4mph - Average wind speed in August:
3.8mph - Average wind speed in September:
3.6mph - Average wind speed in October:
3.9mph - Average wind speed in November:
4.5mph - Average wind speed in December:
4.2mph
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
Rochester, WA
The month with the highest relative humidity is November (90%).
The month with the lowest relative humidity is July (73%).
Average rainfall
Rochester, WA
- Average rainfall in January:
3.86" - Average rainfall in February:
2.32" - Average rainfall in March:
2.6" - Average rainfall in April:
1.85" - Average rainfall in May:
1.34" - Average rainfall in June:
1.06"
- Average rainfall in July:
0.35" - Average rainfall in August:
0.39" - Average rainfall in September:
1.14" - Average rainfall in October:
2.76" - Average rainfall in November:
2.52" - Average rainfall in December:
3.74"
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
Rochester, WA
- Average rainfall days in January:
17.8 days - Average rainfall days in February:
15.9 days - Average rainfall days in March:
19.8 days - Average rainfall days in April:
17.6 days - Average rainfall days in May:
13.4 days - Average rainfall days in June:
10.9 days
- Average rainfall days in July:
6.3 days - Average rainfall days in August:
5.6 days - Average rainfall days in September:
10.6 days - Average rainfall days in October:
14.9 days - Average rainfall days in November:
17.3 days - Average rainfall days in December:
17.9 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
Rochester, WA
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
Rochester, WA
- Average snowfall days in January:
1.8 days - Average snowfall days in February:
2.7 days - Average snowfall days in March:
1.5 days - Average snowfall days in April:
0.1 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.6 days - Average snowfall days in December:
1.2 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 / Average sunshine
Rochester, WA
- Average daylight in January:
9h and 0min - Average daylight in February:
10h and 18min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 36min - Average daylight in May:
15h and 6min - Average daylight in June:
15h and 48min
- Average daylight in July:
15h and 24min - Average daylight in August:
14h and 6min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 24min - Average daylight in December:
8h and 36min
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 36min - Average sunshine in February:
3h and 42min - Average sunshine in March:
4h and 54min - Average sunshine in April:
6h and 48min - Average sunshine in May:
8h and 0min - Average sunshine in June:
8h and 42min
- Average sunshine in July:
9h and 54min - Average sunshine in August:
10h and 6min - Average sunshine in September:
8h and 18min - Average sunshine in October:
4h and 54min - Average sunshine in November:
4h and 0min - Average sunshine in December:
3h and 30min
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
Rochester, WA
- Average sunshine days in January:
10.7 days - Average sunshine days in February:
9.3 days - Average sunshine days in March:
9.3 days - Average sunshine days in April:
10.1 days - Average sunshine days in May:
14.8 days - Average sunshine days in June:
15.8 days
- Average sunshine days in July:
20.8 days - Average sunshine days in August:
20.9 days - Average sunshine days in September:
16.9 days - Average sunshine days in October:
14.3 days - Average sunshine days in November:
10.5 days - Average sunshine days in December:
10.8 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
Rochester, WA
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
Rochester, WA
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
Rochester, WA
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).
