Climate and monthly weather forecastRoy, WA
Climate and monthly weather forecast
Weather in January
January, the same as December, in Roy, Washington, is another chilly winter month, with an average temperature fluctuating between 45.5°F (7.5°C) and 34.7°F (1.5°C). As December turns into January, the average high-temperatures rest at a still chilly 45.5°F (7.5°C), showing a minor variation from the prior month. Weather in January »Weather in February
February, the last month of the winter in Roy, is also a frosty month, with an average temperature ranging between max 46.4°F (8°C) and min 34°F (1.1°C). Roy notes an average high-temperature of a still chilly 46.4°F (8°C) in February, displaying minor variation from January. Weather in February »Weather in March
March, the first month of the spring in Roy, is a cool month, with temperature in the range of an average high of 51.4°F (10.8°C) and an average low of 36.3°F (2.4°C). Roy indicates an average high-temperature of a fresh 51.4°F (10.8°C) in March, showing minor variation from February's 46.4°F (8°C). Weather in March »Weather in April
April is a mild spring month in Roy, Washington, with temperature in the range of an average low of 39°F (3.9°C) and an average high of 57°F (13.9°C). Entering April, Roy notices a subtle temperature elevation, with the average high-temperature advancing from March's fresh 51.4°F (10.8°C) to a mild 57°F (13.9°C). Weather in April »Weather in May
The last month of the spring, May, is a comfortable month in Roy, Washington, with an average temperature ranging between min 43.2°F (6.2°C) and max 65.8°F (18.8°C). May brings a slight increase in the average high-temperature, progressing from 57°F (13.9°C) in April to a still refreshing 65.8°F (18.8°C). Weather in May »Weather in June
June, the first month of the summer in Roy, is a pleasant month, with an average temperature fluctuating between 46.4°F (8°C) and 70.2°F (21.2°C). As June takes hold, the average high-temperature is an agreeable 70.2°F (21.2°C), nearly mirroring that of the previous month. Weather in June »Weather in July
July in Roy, Washington, is a moderately hot summer month, with an average temperature fluctuating between 77.5°F (25.3°C) and 50.5°F (10.3°C). In July, the meteorological conditions subtly change with the average high-temperature edging from a pleasant 70.2°F (21.2°C) in June to a warm 77.5°F (25.3°C). Weather in July »Weather in August
August, the last month of the summer in Roy, is another warm month, with temperature in the range of an average high of 78.4°F (25.8°C) and an average low of 52.2°F (11.2°C). The warmest period tends to be August, when average temperatures fluctuate between a high of 78.4°F (25.8°C) and a low of 52.2°F (11.2°C). Weather in August »Weather in September
The first month of the autumn, September, is still a pleasant month in Roy, Washington, with an average temperature ranging between min 48.9°F (9.4°C) and max 70.7°F (21.5°C). September's onset brings a negligible change in high-temperatures, falling from a warm 78.4°F (25.8°C) in August to an agreeable 70.7°F (21.5°C). Weather in September »Weather in October
October, like September, is another refreshing autumn month in Roy, Washington, with an average temperature ranging between max 58.8°F (14.9°C) and min 43.3°F (6.3°C). The start of October involves a temperature drop, moving from a pleasant 70.7°F (21.5°C) in September to a moderate 58.8°F (14.9°C). Weather in October »Weather in November
November, the last month of the autumn in Roy, is also a frosty month, with an average temperature ranging between max 49.6°F (9.8°C) and min 38.3°F (3.5°C). November brings a decrease in the average high-temperature, falling from October's moderate 58.8°F (14.9°C) to a frosty 49.6°F (9.8°C). Weather in November »Weather in December
The first month of the winter, December, is still a chilly month in Roy, Washington, with an average temperature fluctuating between 43.5°F (6.4°C) and 34.2°F (1.2°C). December stands out as Roy's coldest month, with temperatures ranging between an average high of 43.5°F (6.4°C) and a low of 34.2°F (1.2°C). Weather in December »Updated: Feb 14, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
With an average relative humidity of 88%, January is the most humid month in Roy.
In Roy, Washington, during the entire year, the rain falls for 174.2 days and collects up to 31.06" (789mm) of precipitation.
Months with snowfall are January through April, November and December.
In Roy, Washington, during the entire year, snow falls for 7.9 days and aggregates up to 4.45" (113mm) of snow.
The months with the lowest UV index in Roy, Washington, are January, February, November and December, with an average maximum UV index of 2.
February is the month with the most snowfall. Snow falls for 2.8 days and accumulates 1.73" (44mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Roy, 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.
In Roy, Washington, snow does not fall in May through October.
June has the longest days of the year, with an average of 15h and 48min of daylight.
With an average relative humidity of 69%, July is the least humid month.
The month with the least rainfall in Roy is July, when the rain falls for 6 days and typically collects 0.35" (9mm) of precipitation.
July is the month with the highest UV index in Roy, Washington, with an average maximum UV index of 6.
In Roy, August is known for its average highest temperatures, reaching a high of 78.4°F (25.8°C) and a low of 52.2°F (11.2°C).
The month with the most sunshine is August, with an average of 10.6h of sunshine.
Roy notes the coldest temperatures in December, with a average high of 43.5°F (6.4°C) and a low of 34.2°F (1.2°C).
December is the month with the most rainfall in Roy, Washington. Rain falls for 18.6 days and accumulates 4.96" (126mm) of precipitation.
December has the shortest days of the year in Roy, with an average of 8h and 36min of daylight.
December has the least sunshine of the year, with an average of 3.9h of sunshine.
Average temperature
Roy, WA
The warmest month (with the highest average high temperature) is August (78.4°F).
The month with the lowest average high temperature is December (43.5°F).
The month with the highest average low temperature is August (52.2°F).
The coldest month (with the lowest average low temperature) is February (34°F).
Average pressure
Roy, WA
- Average pressure in January:
30.09"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
30.05"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
30.03"Hg
- Average pressure in July:
30.04"Hg - Average pressure in August:
30.01"Hg - Average pressure in September:
30.01"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 (30.01"Hg).
Average wind speed
Roy, WA
- Average wind speed in January:
4.8mph - Average wind speed in February:
4.8mph - Average wind speed in March:
5mph - Average wind speed in April:
4.7mph - Average wind speed in May:
4.2mph - Average wind speed in June:
4.2mph
- Average wind speed in July:
3.9mph - Average wind speed in August:
3.7mph - Average wind speed in September:
3.9mph - Average wind speed in October:
4.3mph - Average wind speed in November:
4.9mph - Average wind speed in December:
4.5mph
The windiest month (with the highest average wind speed) is March (5mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity
Roy, WA
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is July (69%).
Average rainfall
Roy, WA
- Average rainfall in January:
4.61" - Average rainfall in February:
2.83" - Average rainfall in March:
3.07" - Average rainfall in April:
2.36" - Average rainfall in May:
1.69" - Average rainfall in June:
1.14"
- Average rainfall in July:
0.35" - Average rainfall in August:
0.51" - Average rainfall in September:
1.65" - Average rainfall in October:
3.78" - Average rainfall in November:
4.09" - Average rainfall in December:
4.96"
The wettest month (with the highest rainfall) is December (4.96").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days
Roy, WA
- Average rainfall days in January:
18 days - Average rainfall days in February:
16.9 days - Average rainfall days in March:
19.7 days - Average rainfall days in April:
17.8 days - Average rainfall days in May:
13.4 days - Average rainfall days in June:
11.6 days
- Average rainfall days in July:
6 days - Average rainfall days in August:
5.2 days - Average rainfall days in September:
12 days - Average rainfall days in October:
15.9 days - Average rainfall days in November:
19.1 days - Average rainfall days in December:
18.6 days
The month with the highest number of rainy days is March (19.7 days).
The month with the least rainy days is August (5.2 days).
Average snowfall
Roy, WA
The month with the highest snowfall is February (1.73").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Roy, WA
- Average snowfall days in January:
1.6 days - Average snowfall days in February:
2.8 days - Average snowfall days in March:
1.4 days - Average snowfall days in April:
0.2 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:
0.5 days - Average snowfall days in December:
1.4 days
The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Roy, 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 12min - 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:
4h and 6min - Average sunshine in February:
4h and 12min - Average sunshine in March:
5h and 48min - Average sunshine in April:
7h and 42min - Average sunshine in May:
8h and 42min - Average sunshine in June:
9h and 18min
- Average sunshine in July:
10h and 24min - Average sunshine in August:
10h and 36min - Average sunshine in September:
9h and 0min - Average sunshine in October:
5h and 24min - Average sunshine in November:
4h and 24min - Average sunshine in December:
3h and 54min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days
Roy, WA
- Average sunshine days in January:
10.7 days - Average sunshine days in February:
9.4 days - Average sunshine days in March:
9.3 days - Average sunshine days in April:
10.9 days - Average sunshine days in May:
16 days - Average sunshine days in June:
16 days
- Average sunshine days in July:
22.5 days - Average sunshine days in August:
22.9 days - Average sunshine days in September:
15.6 days - Average sunshine days in October:
13 days - Average sunshine days in November:
9.1 days - Average sunshine days in December:
10.1 days
The month with the most sunshine days is August (22.9 days).
The month with the least sunshine days is November (9.1 days).
Average UV index
Roy, WA
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Roy, WA
The months with the most cloud cover are January and December (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility
Roy, WA
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February and December (4mi).
