Climate and monthly weather forecastCastle Rock, WA
Climate and monthly weather forecast
Weather in January
January in Castle Rock, Washington, is a frosty winter month, with temperature in the range of an average high of 44.2°F (6.8°C) and an average low of 33.3°F (0.7°C). Castle Rock indicates an average high-temperature of a frosty 44.2°F (6.8°C) in January, showing minor variation from December's 42.4°F (5.8°C). Weather in January »Weather in February
The last month of the winter, February, is also a frosty month in Castle Rock, Washington, with an average temperature varying between 45.5°F (7.5°C) and 33.1°F (0.6°C). The advent of February sees the average high-temperature at a still chilly 45.5°F (7.5°C), subtly shifted from January's 44.2°F (6.8°C). Weather in February »Weather in March
The first month of the spring, March, is a cool month in Castle Rock, Washington, with an average temperature ranging between min 34.7°F (1.5°C) and max 50°F (10°C). Castle Rock's March average high-temperature settles at a fresh 50°F (10°C), showing a near match with the preceding month. Weather in March »Weather in April
April is a mild spring month in Castle Rock, Washington, with an average temperature fluctuating between 55.9°F (13.3°C) and 36.5°F (2.5°C). In Castle Rock, the average high-temperature in April slightly rises, from a fresh 50°F (10°C) in March, to a refreshing 55.9°F (13.3°C). Weather in April »Weather in May
The last month of the spring, May, is a comfortable month in Castle Rock, Washington, with an average temperature ranging between min 40.6°F (4.8°C) and max 64.4°F (18°C). May's arrival coincides with a subtle temperature rise, moving from April's refreshing 55.9°F (13.3°C) to an enjoyable 64.4°F (18°C). Weather in May »Weather in June
June, the first month of the summer in Castle Rock, is an agreeable month, with an average temperature fluctuating between 44.2°F (6.8°C) and 69.3°F (20.7°C). Castle Rock observes an average high-temperature of an agreeable 69.3°F (20.7°C) in June, barely different from 64.4°F (18°C) in May. Weather in June »Weather in July
July in Castle Rock, Washington, is a moderately hot summer month, with an average temperature fluctuating between 76.6°F (24.8°C) and 48°F (8.9°C). July's arrival signals a subtle increase in average high-temperatures, moving from June's pleasant 69.3°F (20.7°C) to a warm 76.6°F (24.8°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Castle Rock, Washington, with an average temperature ranging between min 49.6°F (9.8°C) and max 77.7°F (25.4°C). August proves to be the warmest month, recording an average peak temperature of 77.7°F (25.4°C) and a minimum temperature of 49.6°F (9.8°C). Weather in August »Weather in September
September, the first month of the autumn in Castle Rock, is also an agreeable month, with an average temperature fluctuating between 70.7°F (21.5°C) and 47.1°F (8.4°C). September's arrival aligns with a minor decrease in average high-temperatures, from August's warm 77.7°F (25.4°C) to a pleasant 70.7°F (21.5°C). Weather in September »Weather in October
October, like September, is a moderate autumn month in Castle Rock, Washington, with an average temperature varying between 41.9°F (5.5°C) and 58.8°F (14.9°C). A moderate decline in the average high-temperature is seen during October, decreasing from a pleasant 70.7°F (21.5°C) in September to a mild 58.8°F (14.9°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Castle Rock, Washington, with an average temperature ranging between max 48.4°F (9.1°C) and min 37.2°F (2.9°C). In Castle Rock, the beginning of November is marked by a lowered average high-temperature, shifting from October's refreshing 58.8°F (14.9°C) to a chilly 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 Castle Rock, Washington, with an average temperature ranging between min 32.5°F (0.3°C) and max 42.4°F (5.8°C). The coldest period is December, when temperatures fluctuate between an average high of 42.4°F (5.8°C) and a low of 32.5°F (0.3°C). Weather in December »Updated: Feb 14, 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 in Castle Rock is January, when the rain falls for 15.1 days and typically aggregates up to 2.28" (58mm) of precipitation.
In Castle Rock, during the entire year, the rain falls for 157.3 days and collects up to 16.54" (420mm) of precipitation.
Months with snowfall are January through March, November and December.
In Castle Rock, Washington, during the entire year, snow falls for 7 days and aggregates up to 2.99" (76mm) of snow.
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
February and November, with an average relative humidity of 89%, are most humid months in Castle Rock, Washington.
February is the month with the most snowfall in Castle Rock, Washington. Snow falls for 2.4 days and accumulates 1.02" (26mm) of snow.
With an average of 3.5h of sunshine, February has the least sunshine of the year in Castle Rock.
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.
April through October are months without snowfall in Castle Rock.
The month with the longest days in Castle Rock is June, with an average of 15h and 42min of daylight.
June and July, with an average maximum UV index of 5, are months with the highest UV index.
July and August, with an average relative humidity of 73%, are the least humid months in Castle Rock.
August, known for its average high temperature of 77.7°F (25.4°C) and an average low temperature of 49.6°F (9.8°C), is the warmest month.
The month with the least rainfall is August, when the rain falls for 6.6 days and typically collects 0.31" (8mm) of precipitation.
With an average of 10.3h of sunshine, August has the most sunshine of the year.
With average temperatures fluctuating between a high of 42.4°F (5.8°C) and a low of 32.5°F (0.3°C), December stands out as the coldest month in Castle Rock.
With an average of 8h and 42min of daylight, December has the shortest days of the year.
Average temperature
Castle Rock, WA
The warmest month (with the highest average high temperature) is August (77.7°F).
The month with the lowest average high temperature is December (42.4°F).
The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is December (32.5°F).
Average pressure
Castle Rock, WA
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.07"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:
30.05"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:
30.05"Hg - Average pressure in December:
30.09"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed
Castle Rock, WA
- Average wind speed in January:
4.8mph - Average wind speed in February:
4.4mph - Average wind speed in March:
4.5mph - Average wind speed in April:
4.3mph - Average wind speed in May:
4mph - Average wind speed in June:
3.9mph
- Average wind speed in July:
4mph - Average wind speed in August:
3.7mph - Average wind speed in September:
3.7mph - Average wind speed in October:
4mph - Average wind speed in November:
4.7mph - Average wind speed in December:
4.5mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest months (with the lowest average wind speed) are August and September (3.7mph).
Average humidity
Castle Rock, WA
The months with the highest relative humidity are February and November (89%).
The months with the lowest relative humidity are July and August (73%).
Average rainfall
Castle Rock, WA
- Average rainfall in January:
2.28" - Average rainfall in February:
1.65" - Average rainfall in March:
1.69" - Average rainfall in April:
1.57" - Average rainfall in May:
1.22" - Average rainfall in June:
1.02"
- Average rainfall in July:
0.35" - Average rainfall in August:
0.31" - Average rainfall in September:
0.94" - Average rainfall in October:
1.69" - Average rainfall in November:
1.65" - Average rainfall in December:
2.13"
The wettest month (with the highest rainfall) is January (2.28").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days
Castle Rock, WA
- Average rainfall days in January:
15.1 days - Average rainfall days in February:
14.7 days - Average rainfall days in March:
17.5 days - Average rainfall days in April:
16.9 days - Average rainfall days in May:
13.3 days - Average rainfall days in June:
12.3 days
- Average rainfall days in July:
6.1 days - Average rainfall days in August:
6.6 days - Average rainfall days in September:
10.3 days - Average rainfall days in October:
13.6 days - Average rainfall days in November:
15.5 days - Average rainfall days in December:
15.4 days
The month with the highest number of rainy days is March (17.5 days).
The month with the least rainy days is July (6.1 days).
Average snowfall
Castle Rock, WA
The month with the highest snowfall is February (1.02").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Castle Rock, WA
- Average snowfall days in January:
1.8 days - Average snowfall days in February:
2.4 days - Average snowfall days in March:
1.3 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:
0.5 days - Average snowfall days in December:
0.9 days
The month with the highest number of snowfall days is February (2.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Castle Rock, WA
- Average daylight in January:
9h and 6min - Average daylight in February:
10h and 24min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 36min - Average daylight in May:
15h and 0min - Average daylight in June:
15h and 42min
- 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 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in January:
3h and 36min - Average sunshine in February:
3h and 30min - Average sunshine in March:
4h and 48min - Average sunshine in April:
6h and 36min - Average sunshine in May:
7h and 54min - Average sunshine in June:
8h and 30min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
10h and 18min - Average sunshine in September:
8h and 30min - Average sunshine in October:
5h and 0min - Average sunshine in November:
3h and 48min - Average sunshine in December:
3h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 3h and 30min).
Average sunshine days
Castle Rock, WA
- Average sunshine days in January:
13.7 days - Average sunshine days in February:
10.6 days - Average sunshine days in March:
11.5 days - Average sunshine days in April:
10.5 days - Average sunshine days in May:
15.3 days - Average sunshine days in June:
14.4 days
- Average sunshine days in July:
21.8 days - Average sunshine days in August:
21.9 days - Average sunshine days in September:
17.5 days - Average sunshine days in October:
15.9 days - Average sunshine days in November:
12.5 days - Average sunshine days in December:
12.5 days
The month with the most sunshine days is August (21.9 days).
The month with the least sunshine days is April (10.5 days).
Average UV index
Castle Rock, 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
Castle Rock, WA
The month with the most cloud cover is February (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility
Castle Rock, WA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
