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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, in Roslyn, Washington, is a freezing cold winter month, with an average temperature ranging between max 30.7°F (-0.7°C) and min 18.9°F (-7.3°C). The introduction of January notes a subtle temperature variation to a still freezing cold 30.7°F (-0.7°C) from December's 29.7°F (-1.3°C). Weather in January »
Weather in February
February, the last month of the winter in Roslyn, is a cold month, with an average temperature fluctuating between 19.2°F (-7.1°C) and 32°F (0°C). Stepping into February, Roslyn records an average high-temperature of a wintry 32°F (0°C), almost consistent with January. Weather in February »
Weather in March
March, the first month of the spring in Roslyn, is still a cold month, with temperature in the range of an average high of 37.6°F (3.1°C) and an average low of 23.9°F (-4.5°C). In Roslyn, the average high-temperature in March slightly rises, from 32°F (0°C) in February, to a still icy 37.6°F (3.1°C). Weather in March »
Weather in April
April is a chilly spring month in Roslyn, Washington, with temperature in the range of an average high of 46.2°F (7.9°C) and an average low of 29.7°F (-1.3°C). As March gives way to April, the average high-temperature displays a slight ascent, adjusting from a cold 37.6°F (3.1°C) to a frosty 46.2°F (7.9°C). Weather in April »
Weather in May
May, the last month of the spring in Roslyn, is a refreshing month, with an average temperature fluctuating between 37.4°F (3°C) and 57.7°F (14.3°C). Noticing a change, the average high-temperature during May moves from April's chilly 46.2°F (7.9°C) to a moderate 57.7°F (14.3°C). Weather in May »
Weather in June
June, the first month of the summer in Roslyn, is a refreshing month, with an average temperature ranging between min 41.9°F (5.5°C) and max 64°F (17.8°C). The onset of June marks a slight increase in the average high-temperature, moving from a mild 57.7°F (14.3°C) in May to an enjoyable 64°F (17.8°C). Weather in June »
Weather in July
July in Roslyn, Washington, is a warm summer month, with an average temperature varying between 74.8°F (23.8°C) and 47.5°F (8.6°C). July shows a rise in the average high-temperature, moving from June's comfortable 64°F (17.8°C) to a moderately hot 74.8°F (23.8°C). Weather in July »
Weather in August
August, the last month of the summer in Roslyn, is also a moderately hot month, with temperature in the range of an average low of 47.8°F (8.8°C) and an average high of 75.4°F (24.1°C). In Roslyn, August is the warmest month, with temperatures averaging a high of 75.4°F (24.1°C) and a low of 47.8°F (8.8°C). Weather in August »
Weather in September
September, the first month of the autumn in Roslyn, is also an enjoyable month, with temperature in the range of an average high of 64.6°F (18.1°C) and an average low of 42.3°F (5.7°C). September's arrival comes with a decrease in the average high-temperature, moving from a moderately hot 75.4°F (24.1°C) in August to a refreshing 64.6°F (18.1°C). Weather in September »
Weather in October
October, like September, in Roslyn, Washington, is another fresh autumn month, with an average temperature ranging between max 50.7°F (10.4°C) and min 34.7°F (1.5°C). The shift from September to October corresponds with a decrease in the average high-temperature, down to a cool 50.7°F (10.4°C) from a comfortable 64.6°F (18.1°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a wintry month in Roslyn, Washington, with temperature in the range of an average low of 25.9°F (-3.4°C) and an average high of 37.6°F (3.1°C). The move into November indicates a reduction in the average high-temperature, down from October's fresh 50.7°F (10.4°C) to a cold 37.6°F (3.1°C). Weather in November »
Weather in December
The first month of the winter, December, is still a freezing cold month in Roslyn, Washington, with an average temperature fluctuating between 29.7°F (-1.3°C) and 18.3°F (-7.6°C). In Roslyn, the month of December is known for its lowest average temperatures, reaching a high of 29.7°F (-1.3°C) and a low of 18.3°F (-7.6°C). Weather in December »
Updated: Aug 5, 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 and February, with an average relative humidity of 92%, are most humid months.
What is the wettest month?
January is the month with the most rainfall. Rain falls for 14.2 days and accumulates 4.41" (112mm) of precipitation.
How many days does it rain?
In Roslyn, during the entire year, the rain falls for 161.2 days and collects up to 28.46" (723mm) of precipitation.
When does it snow?
January through May, September through December are months with snowfall.
What is the snowiest month in Roslyn?
The month with the most snowfall in Roslyn is January, when snow falls for 13.8 days and typically aggregates up to 16.3" (414mm) of snow.
How much does it snow?
Throughout the year, there are 69.9 snowfall days, and 60.24" (1530mm) of snow is accumulated.
What is the month with the least sunshine in Roslyn?
The month with the least sunshine is January, with an average of 3.4h of sunshine.
What is the month with the lowest UV index?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1.
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?
In Roslyn, snow does not fall in June through August.
When are the longest days?
With an average of 15h and 54min of daylight, June has the longest days of the year.
What are the least humid months?
July and August, with an average relative humidity of 60%, are the least humid months.
What is the driest month?
The month with the least rainfall is July, when the rain falls for 7 days and typically collects 0.39" (10mm) of precipitation.
When is the highest UV index?
July is the month with the highest UV index, with an average maximum UV index of 5.
What month is the hottest?
August is the warmest month, exhibiting average temperatures of 75.4°F (24.1°C) at the peak and 47.8°F (8.8°C) at the base.
What month has the most sunshine?
With an average of 11.9h of sunshine, August has the most sunshine of the year in Roslyn.
What is the coldest month?
December, characterized by an average high temperature of 29.7°F (-1.3°C) and a low temperature of 18.3°F (-7.6°C), is generally the coldest month in Roslyn.
What is the month with the shortest days?
With an average of 8h and 36min of daylight, December has the shortest days of the year.
Average temperature
Roslyn, WA
The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is December (29.7°F).
The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is December (18.3°F).
Average pressure
Roslyn, WA
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
30.02"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.97"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
29.98"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is August (29.96"Hg).
Average wind speed
Roslyn, WA
- Average wind speed in January:
4.5mph - Average wind speed in February:
4.7mph - Average wind speed in March:
5mph - Average wind speed in April:
5.8mph - Average wind speed in May:
5.8mph - Average wind speed in June:
6.7mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.1mph - Average wind speed in September:
5.3mph - Average wind speed in October:
4.6mph - Average wind speed in November:
4.5mph - Average wind speed in December:
4.2mph
The windiest month (with the highest average wind speed) is June (6.7mph).
The calmest month (with the lowest average wind speed) is December (4.2mph).
Average humidity
Roslyn, WA
The months with the highest relative humidity are January and February (92%).
The months with the lowest relative humidity are July and August (60%).
Average rainfall
Roslyn, WA
- Average rainfall in January:
4.41" - Average rainfall in February:
3.94" - Average rainfall in March:
3.23" - Average rainfall in April:
1.93" - Average rainfall in May:
1.81" - Average rainfall in June:
1.06"
- Average rainfall in July:
0.39" - Average rainfall in August:
0.51" - Average rainfall in September:
1.1" - Average rainfall in October:
2.87" - Average rainfall in November:
3.03" - Average rainfall in December:
4.17"
The wettest month (with the highest rainfall) is January (4.41").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days
Roslyn, WA
- Average rainfall days in January:
14.2 days - Average rainfall days in February:
13.6 days - Average rainfall days in March:
18.3 days - Average rainfall days in April:
18.3 days - Average rainfall days in May:
16.1 days - Average rainfall days in June:
11.7 days
- Average rainfall days in July:
7 days - Average rainfall days in August:
5.5 days - Average rainfall days in September:
10.7 days - Average rainfall days in October:
15.7 days - Average rainfall days in November:
18 days - Average rainfall days in December:
12.1 days
The months with the highest number of rainy days are March and April (18.3 days).
The month with the least rainy days is August (5.5 days).
Average snowfall
Roslyn, WA
- Average snowfall in January:
16.3" - Average snowfall in February:
13.35" - Average snowfall in March:
8.15" - Average snowfall in April:
1.97" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is January (16.3").
The months with the least snowfall are June, July and August (0").
Average snowfall days
Roslyn, WA
- Average snowfall days in January:
13.8 days - Average snowfall days in February:
14.3 days - Average snowfall days in March:
12.8 days - Average snowfall days in April:
5.3 days - Average snowfall days in May:
0.3 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:
0.2 days - Average snowfall days in October:
0.6 days - Average snowfall days in November:
7.5 days - Average snowfall days in December:
15.1 days
The month with the highest number of snowfall days is December (15.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight / Average sunshine
Roslyn, 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:
3h and 2min - Average sunshine in February:
3h and 5min - Average sunshine in March:
5h and 5min - Average sunshine in April:
9h and 1min - Average sunshine in May:
10h and 2min - Average sunshine in June:
11h and 1min
- Average sunshine in July:
11h and 5min - Average sunshine in August:
11h and 5min - Average sunshine in September:
10h and 1min - Average sunshine in October:
6h and 0min - Average sunshine in November:
5h and 0min - Average sunshine in December:
3h and 4min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days
Roslyn, WA
- Average sunshine days in January:
9.9 days - Average sunshine days in February:
6.8 days - Average sunshine days in March:
7.7 days - Average sunshine days in April:
8.5 days - Average sunshine days in May:
12.2 days - Average sunshine days in June:
14.3 days
- Average sunshine days in July:
21.9 days - Average sunshine days in August:
22.8 days - Average sunshine days in September:
16.3 days - Average sunshine days in October:
13.8 days - Average sunshine days in November:
8.7 days - Average sunshine days in December:
10.2 days
The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (6.8 days).
Average UV index
Roslyn, WA
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover
Roslyn, WA
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility
Roslyn, WA
The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (3mi).
Roslyn, Washington, USA
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