Climate and monthly weather forecastThornton, WA
Climate and monthly weather forecast
Weather in January
January, like December, in Thornton, Washington, is an icy winter month, with an average temperature ranging between min 26.1°F (-3.3°C) and max 36.1°F (2.3°C). January reports an average high-temperature of a still cold 36.1°F (2.3°C), slightly varied from December's 34.7°F (1.5°C). Weather in January »Weather in February
The last month of the winter, February, is another cold month in Thornton, Washington, with an average temperature varying between 39°F (3.9°C) and 28°F (-2.2°C). A minor adjustment in Thornton's average high-temperature is noted with the start of February, touching a still wintry 39°F (3.9°C) from January's 36.1°F (2.3°C). Weather in February »Weather in March
The first month of the spring, March, is a frosty month in Thornton, Washington, with an average temperature varying between 46.9°F (8.3°C) and 33.1°F (0.6°C). The onset of March introduces a subtle rise in the average high-temperature, nudging from an icy 39°F (3.9°C) in February to a chilly 46.9°F (8.3°C). Weather in March »Weather in April
April in Thornton, Washington, is a cool spring month, with temperature in the range of an average low of 37°F (2.8°C) and an average high of 55°F (12.8°C). As Thornton, Washington, welcomes April, the average high-temperature sees a modest rise, transitioning from a chilly 46.9°F (8.3°C) in March to a fresh 55°F (12.8°C). Weather in April »Weather in May
The last month of the spring, May, is a comfortable month in Thornton, Washington, with an average temperature varying between 64.4°F (18°C) and 43°F (6.1°C). The arrival of May signals an increase in the average high-temperature, moving from a cool 55°F (12.8°C) in April to a refreshing 64.4°F (18°C). Weather in May »Weather in June
The first month of the summer, June, is an agreeable month in Thornton, Washington, with an average temperature varying between 71.1°F (21.7°C) and 48.6°F (9.2°C). Thornton's weather in June shows a minor rise in the average high-temperature, moving slightly up from May's comfortable 64.4°F (18°C) to an agreeable 71.1°F (21.7°C). Weather in June »Weather in July
July in Thornton, Washington, is a warm summer month, with an average temperature fluctuating between 83.3°F (28.5°C) and 57°F (13.9°C). As Thornton, Washington, welcomes July, the average high-temperature sees a rise, transitioning from a pleasant 71.1°F (21.7°C) in June to a moderately hot 83.3°F (28.5°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Thornton, Washington, with temperature in the range of an average low of 60.4°F (15.8°C) and an average high of 83.5°F (28.6°C). Thornton's temperatures tend to reach their peak averages in August, with a high of 83.5°F (28.6°C) and a low of 60.4°F (15.8°C). Weather in August »Weather in September
The first month of the autumn, September, is also an agreeable month in Thornton, Washington, with temperature in the range of an average high of 73.2°F (22.9°C) and an average low of 52.9°F (11.6°C). Thornton's September weather features a mild decline in high-temperatures, reducing from a moderately hot 83.5°F (28.6°C) in August to an agreeable 73.2°F (22.9°C). Weather in September »Weather in October
October, the same as September, in Thornton, Washington, is another mild autumn month, with an average temperature fluctuating between 42.1°F (5.6°C) and 57.6°F (14.2°C). The shift into October is marked by a noticeable reduction in the average high-temperature, decreasing from September's agreeable 73.2°F (22.9°C) to a moderate 57.6°F (14.2°C). Weather in October »Weather in November
November, the last month of the autumn in Thornton, is another chilly month, with an average temperature fluctuating between 43.9°F (6.6°C) and 32.9°F (0.5°C). In November, the meteorological conditions alter, with the average high-temperature shifting from a mild 57.6°F (14.2°C) in October to a chilly 43.9°F (6.6°C). Weather in November »Weather in December
December, the first month of the winter in Thornton, is also an icy month, with an average temperature varying between 24.6°F (-4.1°C) and 34.7°F (1.5°C). In Thornton, the lowest average temperatures are observed in December, with a high of 34.7°F (1.5°C) and a low of 24.6°F (-4.1°C). Weather in December »Updated: Jun 3, 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 most humid month is January, with an average relative humidity of 85%.
Throughout the year, there are 120.2 rainfall days, and 14.69" (373mm) of precipitation is accumulated.
Months with snowfall are January through May, September through December.
Throughout the year, there are 39.6 snowfall days, and 22.68" (576mm) of snow is accumulated.
January and December, with an average of 4.6h of sunshine, are months with the least sunshine.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
The month with the most snowfall is February, when snow falls for 9.6 days and typically aggregates up to 6.69" (170mm) of snow.
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.
In Thornton, snow does not fall in June through August.
The month with the longest days is June, with an average of 15h and 48min of daylight.
July is the month with the least rainfall. Rain falls for 4.5 days and accumulates 0.28" (7mm) of precipitation.
July and August, with an average of 12h of sunshine, are months with the most sunshine.
With an average maximum UV index of 7, July is the month with the highest UV index.
The average temperatures reach their apex in August, averaging 83.5°F (28.6°C) at the high end and 60.4°F (15.8°C) at the low end.
With an average relative humidity of 37%, August is the least humid month.
With average high and low temperatures of 34.7°F (1.5°C) and 24.6°F (-4.1°C) respectively, December is Thornton's coldest month.
The month with the most rainfall is December, when the rain falls for 9.5 days and typically aggregates up to 1.93" (49mm) of precipitation.
December has the shortest days of the year in Thornton, with an average of 8h and 36min of daylight.
Average temperature
Thornton, WA
The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (34.7°F).
The month with the highest average low temperature is August (60.4°F).
The coldest month (with the lowest average low temperature) is December (24.6°F).
Average pressure
Thornton, WA
- Average pressure in January:
30.19"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.99"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.96"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 (29.91"Hg).
Average wind speed
Thornton, WA
- Average wind speed in January:
7.3mph - Average wind speed in February:
7.3mph - Average wind speed in March:
8mph - Average wind speed in April:
7.9mph - Average wind speed in May:
6.4mph - Average wind speed in June:
6.6mph
The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity
Thornton, WA
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (37%).
Average rainfall
Thornton, WA
- Average rainfall in January:
1.73" - Average rainfall in February:
1.54" - Average rainfall in March:
1.61" - Average rainfall in April:
1.42" - Average rainfall in May:
1.61" - Average rainfall in June:
1.06"
- Average rainfall in July:
0.28" - Average rainfall in August:
0.39" - Average rainfall in September:
0.47" - Average rainfall in October:
1.26" - Average rainfall in November:
1.38" - Average rainfall in December:
1.93"
The wettest month (with the highest rainfall) is December (1.93").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days
Thornton, WA
- Average rainfall days in January:
10.5 days - Average rainfall days in February:
9.8 days - Average rainfall days in March:
13.7 days - Average rainfall days in April:
14.6 days - Average rainfall days in May:
12.5 days - Average rainfall days in June:
10.6 days
- Average rainfall days in July:
4.5 days - Average rainfall days in August:
5.1 days - Average rainfall days in September:
6.4 days - Average rainfall days in October:
11.3 days - Average rainfall days in November:
11.7 days - Average rainfall days in December:
9.5 days
The month with the highest number of rainy days is April (14.6 days).
The month with the least rainy days is July (4.5 days).
Average snowfall
Thornton, WA
- Average snowfall in January:
5.12" - Average snowfall in February:
6.69" - Average snowfall in March:
2.95" - Average snowfall in April:
0.75" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is February (6.69").
The months with the least snowfall are June, July and August (0").
Average snowfall days
Thornton, WA
- Average snowfall days in January:
8.7 days - Average snowfall days in February:
9.6 days - Average snowfall days in March:
4.8 days - Average snowfall days in April:
2.2 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:
0.1 days - Average snowfall days in October:
0.3 days - Average snowfall days in November:
4 days - Average snowfall days in December:
9.6 days
The months with the highest number of snowfall days are February and December (9.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight / Average sunshine
Thornton, 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 30min - 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 36min - Average sunshine in February:
4h and 42min - Average sunshine in March:
6h and 48min - Average sunshine in April:
9h and 24min - Average sunshine in May:
10h and 24min - Average sunshine in June:
10h and 54min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 18min - Average sunshine in October:
6h and 48min - Average sunshine in November:
5h and 36min - Average sunshine in December:
4h and 36min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 4h and 36min).
Average sunshine days
Thornton, WA
- Average sunshine days in January:
15 days - Average sunshine days in February:
12.2 days - Average sunshine days in March:
14 days - Average sunshine days in April:
12.9 days - Average sunshine days in May:
16.1 days - Average sunshine days in June:
17.8 days
- Average sunshine days in July:
24.6 days - Average sunshine days in August:
22.8 days - Average sunshine days in September:
22.4 days - Average sunshine days in October:
17.9 days - Average sunshine days in November:
15.2 days - Average sunshine days in December:
15.5 days
The month with the most sunshine days is July (24.6 days).
The month with the least sunshine days is February (12.2 days).
Average UV index
Thornton, 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
Thornton, WA
The months with the most cloud cover are January and December (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility
Thornton, WA
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
