Expand
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, like December, is another subzero cold winter month in Roslyn, Washington, with an average temperature fluctuating between 18.9°F (-7.3°C) and 30.7°F (-0.7°C). The arrival of January brings an average high-temperature of a still freezing cold 30.7°F (-0.7°C), subtly diverging 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). February ushers in an average high-temperature of an icy 32°F (0°C), aligning closely with the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is also an icy month in Roslyn, Washington, with an average temperature fluctuating between 23.9°F (-4.5°C) and 37.6°F (3.1°C). As February gives way to March, the average high-temperature displays a slight ascent, adjusting from 32°F (0°C) to a still cold 37.6°F (3.1°C). Weather in March »
Weather in April
April is a frosty spring month in Roslyn, Washington, with temperature in the range of an average low of 29.7°F (-1.3°C) and an average high of 46.2°F (7.9°C). April showcases a minor temperature ascent, adjusting from March's cold 37.6°F (3.1°C) to a chilly 46.2°F (7.9°C). Weather in April »
Weather in May
May, the last month of the spring in Roslyn, is a moderate month, with an average temperature varying between 57.7°F (14.3°C) and 37.4°F (3°C). With the onset of May, Roslyn's weather sees a temperature rise, transitioning from a chilly 46.2°F (7.9°C) in April to a moderate 57.7°F (14.3°C). Weather in May »
Weather in June
The first month of the summer, June, is an enjoyable month in Roslyn, Washington, with an average temperature fluctuating between 64°F (17.8°C) and 41.9°F (5.5°C). With the onset of June, Roslyn's average high-temperature sees a modest rise, moving from May's mild 57.7°F (14.3°C) to a still refreshing 64°F (17.8°C). Weather in June »
Weather in July
July is a moderately hot summer month in Roslyn, Washington, with an average temperature fluctuating between 74.8°F (23.8°C) and 47.5°F (8.6°C). The shift from June to July sees an increase in the average high-temperature, transitioning from a 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 an average temperature ranging between max 75.4°F (24.1°C) and min 47.8°F (8.8°C). August, with its high-temperature average of 75.4°F (24.1°C) and a low-temperature average of 47.8°F (8.8°C), is the warmest month. Weather in August »
Weather in September
The first month of the autumn, September, is also an enjoyable month in Roslyn, Washington, with an average temperature varying between 64.6°F (18.1°C) and 42.3°F (5.7°C). As September arrives, Roslyn's weather displays a decrease in high-temperatures, transitioning from August's warm 75.4°F (24.1°C) to an enjoyable 64.6°F (18.1°C). Weather in September »
Weather in October
October, the same as September, is another fresh autumn month in Roslyn, Washington, with an average temperature fluctuating between 50.7°F (10.4°C) and 34.7°F (1.5°C). The commencement of October indicates a shift in the average high-temperature, receding from September's enjoyable 64.6°F (18.1°C) to a fresh 50.7°F (10.4°C). Weather in October »
Weather in November
November, the last month of the autumn in Roslyn, is also a wintry month, with an average temperature ranging between min 25.9°F (-3.4°C) and max 37.6°F (3.1°C). Transition into November marks a drop in the average high-temperature, moving from a fresh 50.7°F (10.4°C) in October to a wintry 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 temperature in the range of an average high of 29.7°F (-1.3°C) and an average low of 18.3°F (-7.6°C). December brings the lowest temperatures, with an average high of 29.7°F (-1.3°C) and an average low of 18.3°F (-7.6°C). Weather in December »
[Resources]Frequently asked questions
What is the most humid month in Roslyn?
January and February, with an average relative humidity of 92%, are most humid months.
What is the wettest month in Roslyn?
January is the month with the most rainfall in Roslyn, Washington. Rain falls for 14.2 days and accumulates 4.41" (112mm) of precipitation.
How much does it rain in Roslyn?
Throughout the year, there are 161.2 rainfall days, and 28.46" (723mm) of precipitation is accumulated.
When does it snow in Roslyn?
January through May, September through December are months with snowfall in Roslyn, Washington.
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 many days does it snow in Roslyn?
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?
January has the least sunshine of the year in Roslyn, Washington, with an average of 3.4h of sunshine.
What are the months with the lowest UV index in Roslyn?
January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Roslyn.
When is Daylight Saving Time (DST) in Roslyn?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Roslyn, Washington, 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?
In Roslyn, snow does not fall in June through August.
When are the longest days in Roslyn?
June has the longest days of the year in Roslyn, Washington, with an average of 15h and 54min of daylight.
What are the least humid months in Roslyn?
The months with the lowest humidity are July and August, with an average relative humidity of 60%.
What is the driest month in Roslyn?
The month with the least rainfall is July, when the rain falls for 7 days and typically collects 0.39" (10mm) of precipitation.
What is the month with the highest UV index in Roslyn?
July is the month with the highest UV index, with an average maximum UV index of 5.
What is the warmest month in Roslyn?
August stands out as Roslyn's warmest month, with temperatures ranging between an average high of 75.4°F (24.1°C) and a low of 47.8°F (8.8°C).
What month has the most sunshine in Roslyn?
August has the most sunshine of the year, with an average of 11.9h of sunshine.
What is the coldest time of year in Roslyn?
The coldest period is December, when temperatures fluctuate between an average high of 29.7°F (-1.3°C) and a low of 18.3°F (-7.6°C).
What is the month with the shortest days in Roslyn?
The month with the shortest days in Roslyn, Washington, is December, with an average of 8h and 36min of daylight.
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
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location
