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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, the same as December, is an icy winter month in Rosalia, Washington, with an average temperature fluctuating between 24.6°F (-4.1°C) and 34.5°F (1.4°C). With the start of January, Rosalia measures an average high-temperature of a still wintry 34.5°F (1.4°C), not significantly differing from December's 33.1°F (0.6°C). Weather in January »
Weather in February
February, the last month of the winter in Rosalia, is another cold month, with an average temperature fluctuating between 26.8°F (-2.9°C) and 37.9°F (3.3°C). The advent of February reveals an average high-temperature of a still wintry 37.9°F (3.3°C), showing minimal difference from the prior month. Weather in February »
Weather in March
March, the first month of the spring in Rosalia, is a frosty month, with an average temperature ranging between min 32.7°F (0.4°C) and max 46.9°F (8.3°C). As March arrives, Rosalia's weather shows an increase in high-temperatures, moving from February's cold 37.9°F (3.3°C) to a chilly 46.9°F (8.3°C). Weather in March »
Weather in April
April is a moderate spring month in Rosalia, Washington, with an average temperature varying between 37.4°F (3°C) and 55.9°F (13.3°C). With the onset of April, Rosalia sees a temperature rise, with the average high-temperature moving from March's frosty 46.9°F (8.3°C) to a refreshing 55.9°F (13.3°C). Weather in April »
Weather in May
May, the last month of the spring in Rosalia, is an enjoyable month, with an average temperature fluctuating between 65.7°F (18.7°C) and 44.2°F (6.8°C). May's arrival is marked by an increase in the average high-temperature, moving from a moderate 55.9°F (13.3°C) in April to a comfortable 65.7°F (18.7°C). Weather in May »
Weather in June
The first month of the summer, June, is an agreeable month in Rosalia, Washington, with an average temperature varying between 72.1°F (22.3°C) and 49.8°F (9.9°C). The arrival of June witnesses a small shift in the average high-temperature, moving from a comfortable 65.7°F (18.7°C) in May to a pleasant 72.1°F (22.3°C). Weather in June »
Weather in July
July in Rosalia, Washington, is a warm summer month, with temperature in the range of an average high of 84.4°F (29.1°C) and an average low of 58.6°F (14.8°C). With average temperatures fluctuating between a high of 84.4°F (29.1°C) and a low of 58.6°F (14.8°C), July stands out as the warmest month. The heat index for July is evaluated at 84.2°F (29°C). Weather in July »
Weather in August
August, the last month of the summer in Rosalia, is another warm month, with an average temperature varying between 61.3°F (16.3°C) and 83.8°F (28.8°C). With the arrival of August, Rosalia's average high-temperature registers at a still warm 83.8°F (28.8°C), indicating a subtle variation from the previous month. Weather in August »
Weather in September
The first month of the autumn, September, is also an agreeable month in Rosalia, Washington, with temperature in the range of an average low of 53.2°F (11.8°C) and an average high of 72.9°F (22.7°C). In the transition to September, Rosalia observes a drop in the average high-temperature, moving from a warm 83.8°F (28.8°C) in August to a pleasant 72.9°F (22.7°C). Weather in September »
Weather in October
October, the same as September, in Rosalia, Washington, is another mild autumn month, with an average temperature ranging between min 41.9°F (5.5°C) and max 56.8°F (13.8°C). With the onset of October, Rosalia's average high-temperature experiences a noticeable drop, receding from September's pleasant 72.9°F (22.7°C) to a mild 56.8°F (13.8°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Rosalia, Washington, with an average temperature ranging between max 43°F (6.1°C) and min 31.8°F (-0.1°C). The average high-temperature drops in November, from October's refreshing 56.8°F (13.8°C) to a frosty 43°F (6.1°C). Weather in November »
Weather in December
December, the first month of the winter in Rosalia, is also an icy month, with temperature in the range of an average high of 33.1°F (0.6°C) and an average low of 23.9°F (-4.5°C). December, characterized by an average high temperature of 33.1°F (0.6°C) and a low temperature of 23.9°F (-4.5°C), is generally the coldest month. Weather in December »
Updated: Jun 20, 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
What is the most humid month?
January is the most humid month, with an average relative humidity of 87%.
What is the rainiest month?
The wettest months are January and May, with an average 0.91" (23mm) of rainfall.
How much does it rain?
In Rosalia, during the entire year, the rain falls for 84.3 days and collects up to 7.24" (184mm) of precipitation.
When does it snow?
January through May, September, November and December are months with snowfall.
How much does it snow?
Throughout the year, there are 32.5 snowfall days, and 14.09" (358mm) of snow is accumulated.
When is the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
When does it snow the most?
The month with the most snowfall is February, when snow falls for 7.6 days and typically aggregates up to 3.82" (97mm) of snow.
When is Daylight Saving Time (DST)?
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.
When it does not snow?
June through August and October are months without snowfall.
When are the longest days?
June has the longest days of the year, with an average of 15h and 54min of daylight.
What are the warmest months?
Rosalia's warmest weather arrives in July, when temperatures average a high of 84.4°F (29.1°C) and a low of 58.6°F (14.8°C).
What is the driest month?
The month with the least rainfall is July, when the rain falls for 3.5 days and typically collects 0.16" (4mm) of precipitation.
When is the highest UV index?
July is the month with the highest UV index, with an average maximum UV index of 7.
What is the least humid month in Rosalia?
August is the least humid month, with an average relative humidity of 36%.
What month has the most sunshine?
With an average of 12.1h of sunshine, August has the most sunshine of the year.
What is the coldest month?
The coldest time of the year is December, with temperatures averaging a high of 33.1°F (0.6°C) and a low of 23.9°F (-4.5°C).
What is the month with the shortest days?
December has the shortest days of the year in Rosalia, with an average of 8h and 36min of daylight.
What is the month with the least sunshine?
December has the least sunshine of the year, with an average of 4.3h of sunshine.
Average temperature
Rosalia, WA
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is December (33.1°F).
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (23.9°F).
Average pressure
Rosalia, WA
- Average pressure in January:
30.19"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
29.99"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.9"Hg - Average pressure in September:
29.95"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.17"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.9"Hg).
Average wind speed
Rosalia, WA
- Average wind speed in January:
7.4mph - Average wind speed in February:
7.8mph - Average wind speed in March:
8.8mph - Average wind speed in April:
8.6mph - Average wind speed in May:
7.5mph - Average wind speed in June:
7.5mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7mph - Average wind speed in October:
7.4mph - Average wind speed in November:
7.8mph - Average wind speed in December:
7.1mph
The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity
Rosalia, WA
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (36%).
Average rainfall
Rosalia, WA
- Average rainfall in January:
0.91" - Average rainfall in February:
0.71" - Average rainfall in March:
0.79" - Average rainfall in April:
0.63" - Average rainfall in May:
0.91" - Average rainfall in June:
0.59"
- Average rainfall in July:
0.16" - Average rainfall in August:
0.24" - Average rainfall in September:
0.24" - Average rainfall in October:
0.67" - Average rainfall in November:
0.63" - Average rainfall in December:
0.79"
The wettest months (with the highest rainfall) are January and May (0.91").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days
Rosalia, WA
- Average rainfall days in January:
7.6 days - Average rainfall days in February:
6.2 days - Average rainfall days in March:
10.1 days - Average rainfall days in April:
9.5 days - Average rainfall days in May:
8.6 days - Average rainfall days in June:
7.7 days
- Average rainfall days in July:
3.5 days - Average rainfall days in August:
4 days - Average rainfall days in September:
5.6 days - Average rainfall days in October:
8.5 days - Average rainfall days in November:
6.5 days - Average rainfall days in December:
6.5 days
The month with the highest number of rainy days is March (10.1 days).
The month with the least rainy days is July (3.5 days).
Average snowfall
Rosalia, WA
- Average snowfall in January:
3.7" - Average snowfall in February:
3.82" - Average snowfall in March:
1.26" - Average snowfall in April:
0.71" - Average snowfall in May:
0.08" - Average snowfall in June:
0"
The month with the highest snowfall is February (3.82").
The months with the least snowfall are June, July, August and October (0").
Average snowfall days
Rosalia, WA
- Average snowfall days in January:
7.4 days - Average snowfall days in February:
7.6 days - Average snowfall days in March:
3.3 days - Average snowfall days in April:
1.6 days - Average snowfall days in May:
0.2 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:
0.1 days - Average snowfall days in October:
0 days - Average snowfall days in November:
3 days - Average snowfall days in December:
9.3 days
The month with the highest number of snowfall days is December (9.3 days).
The months with the least snowfall days are June, July, August and October (0 days).
Average daylight / Average sunshine
Rosalia, WA
- Average daylight in January:
9h and 0min - Average daylight in February:
10h and 2min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 4min - Average daylight in May:
15h and 1min - Average daylight in June:
15h and 5min
- Average daylight in July:
15h and 3min - Average daylight in August:
14h and 1min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 2min - Average daylight in December:
8h and 4min
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 36min).
- Average sunshine in January:
4h and 3min - Average sunshine in February:
4h and 4min - Average sunshine in March:
6h and 5min - Average sunshine in April:
9h and 3min - Average sunshine in May:
10h and 4min - Average sunshine in June:
10h and 5min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 1min - Average sunshine in September:
10h and 2min - Average sunshine in October:
6h and 4min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 2min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days
Rosalia, WA
- Average sunshine days in January:
17.5 days - Average sunshine days in February:
15.9 days - Average sunshine days in March:
17.5 days - Average sunshine days in April:
18.1 days - Average sunshine days in May:
20.5 days - Average sunshine days in June:
21 days
- Average sunshine days in July:
26.6 days - Average sunshine days in August:
24.3 days - Average sunshine days in September:
23.6 days - Average sunshine days in October:
20.8 days - Average sunshine days in November:
20.3 days - Average sunshine days in December:
19.2 days
The month with the most sunshine days is July (26.6 days).
The month with the least sunshine days is February (15.9 days).
Average UV index
Rosalia, WA
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Rosalia, WA
The months with the most cloud cover are January and December (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility
Rosalia, WA
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
Rosalia, Washington, USA
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