Climate and monthly weather forecastClayton, CA
Climate and monthly weather forecast
Weather in January
January, the same as December, in Clayton, California, is a moderate winter month, with an average temperature fluctuating between 41.7°F (5.4°C) and 56.3°F (13.5°C). The shift into January uncovers an average high-temperature of a still refreshing 56.3°F (13.5°C), subtly different from the previous month. Weather in January »Weather in February
February, the last month of the winter in Clayton, is another mild month, with temperature in the range of an average high of 59.9°F (15.5°C) and an average low of 42.3°F (5.7°C). The arrival of February brings an average high-temperature of a still mild 59.9°F (15.5°C), closely following the temperature pattern of January. Weather in February »Weather in March
March, the first month of the spring in Clayton, is a refreshing month, with an average temperature ranging between max 63°F (17.2°C) and min 43.9°F (6.6°C). The arrival of March marks a slight shift to an average high-temperature of a still refreshing 63°F (17.2°C) from February's 59.9°F (15.5°C). Weather in March »Weather in April
April in Clayton, California, is a pleasant spring month, with temperature in the range of an average high of 68.7°F (20.4°C) and an average low of 46.4°F (8°C). April's arrival signals a modest temperature shift, moving from a comfortable 63°F (17.2°C) in March to an agreeable 68.7°F (20.4°C). Weather in April »Weather in May
May, the last month of the spring in Clayton, is a warm month, with an average temperature varying between 50°F (10°C) and 73.9°F (23.3°C). Clayton's May reports an average high-temperature of a moderately hot 73.9°F (23.3°C), exhibiting a minor difference from April. Weather in May »Weather in June
The first month of the summer, June, is still a warm month in Clayton, California, with an average temperature varying between 82°F (27.8°C) and 54.7°F (12.6°C). June's arrival is noted with a slight increase in the average high-temperature, moving from a moderately hot 73.9°F (23.3°C) in May to a still warm 82°F (27.8°C). Weather in June »Weather in July
July, like June, in Clayton, California, is a moderately hot summer month, with an average temperature varying between 56.1°F (13.4°C) and 85.6°F (29.8°C). In Clayton, July is the month with the highest recorded average temperatures, measuring a high of 85.6°F (29.8°C) and a low of 56.1°F (13.4°C). The heat index in July is estimated at a tropical 89.6°F (32°C). Weather in July »Weather in August
August, the last month of the summer in Clayton, is another warm month, with temperature in the range of an average high of 85.1°F (29.5°C) and an average low of 57.4°F (14.1°C). The start of August sees the average high-temperature at a still moderately hot 85.1°F (29.5°C), showing little difference from July's 85.6°F (29.8°C). Weather in August »Weather in September
September, the first month of the autumn in Clayton, is also a moderately hot month, with an average temperature ranging between min 57.6°F (14.2°C) and max 83.5°F (28.6°C). The dawn of September sees an average high-temperature of a still moderately hot 83.5°F (28.6°C), subtly contrasting with August's 85.1°F (29.5°C). Weather in September »Weather in October
October, the same as September, is a moderately hot autumn month in Clayton, California, with an average temperature fluctuating between 75°F (23.9°C) and 54°F (12.2°C). With the onset of October, Clayton's climate undergoes a slight change as the average high-temperature moves from a warm 83.5°F (28.6°C) in September to a still moderately hot 75°F (23.9°C). Weather in October »Weather in November
November, the last month of the autumn in Clayton, is another comfortable month, with an average temperature fluctuating between 63.7°F (17.6°C) and 46.9°F (8.3°C). With November's onset, the average high-temperature recedes from October's warm 75°F (23.9°C) to a refreshing 63.7°F (17.6°C). Weather in November »Weather in December
December, the first month of the winter in Clayton, is still a refreshing month, with temperature in the range of an average high of 55.4°F (13°C) and an average low of 41.9°F (5.5°C). Clayton's coldest month, December, registers temperatures that range from a high of 55.4°F (13°C) to a low of 41.9°F (5.5°C). Weather in December »Updated: Feb 9, 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
January and March, with an average relative humidity of 73%, are most humid months in Clayton.
Throughout the year, there are 50 rainfall days, and 4.76" (121mm) of precipitation is accumulated.
The months with the lowest UV index in Clayton are January, February, November and December, with an average maximum UV index of 3.
February is the month with the most rainfall. Rain falls for 5.6 days and accumulates 0.98" (25mm) of precipitation.
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.
With an average of 14h and 48min of daylight, June has the longest days of the year in Clayton.
June through August, with an average maximum UV index of 6, are months with the highest UV index in Clayton.
July is the month when Clayton, California, experiences its warmest temperatures, averaging a high of 85.6°F (29.8°C) and a low of 56.1°F (13.4°C).
The months with the least rainfall in Clayton, California, are July and August Rain falls for 1.4 days and accumulates 0.04" (1mm) of rain.
The month with the most sunshine is July, with an average of 12.1h of sunshine.
The months with the lowest humidity are September and October, with an average relative humidity of 55%.
December is the month when Clayton, California, sees the average lowest temperatures, with a high of 55.4°F (13°C) and a low of 41.9°F (5.5°C).
The month with the shortest days in Clayton, California, is December, with an average of 9h and 36min of daylight.
With an average of 5.8h of sunshine, December has the least sunshine of the year in Clayton.
Average temperature
Clayton, CA
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is December (55.4°F).
The month with the highest average low temperature is September (57.6°F).
The coldest month (with the lowest average low temperature) is January (41.7°F).
Average pressure
Clayton, CA
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
30.03"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.92"Hg - Average pressure in October:
29.98"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Clayton, CA
- Average wind speed in January:
4.5mph - Average wind speed in February:
5.5mph - Average wind speed in March:
5.8mph - Average wind speed in April:
6.5mph - Average wind speed in May:
7.4mph - Average wind speed in June:
7.3mph
- Average wind speed in July:
7mph - Average wind speed in August:
6.6mph - Average wind speed in September:
5.8mph - Average wind speed in October:
5mph - Average wind speed in November:
4.3mph - Average wind speed in December:
4.8mph
The windiest month (with the highest average wind speed) is May (7.4mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).
Average humidity
Clayton, CA
The months with the highest relative humidity are January and March (73%).
The months with the lowest relative humidity are September and October (55%).
Average rainfall
Clayton, CA
- Average rainfall in January:
0.83" - Average rainfall in February:
0.98" - Average rainfall in March:
0.75" - Average rainfall in April:
0.28" - Average rainfall in May:
0.2" - Average rainfall in June:
0.08"
- Average rainfall in July:
0.04" - Average rainfall in August:
0.04" - Average rainfall in September:
0.08" - Average rainfall in October:
0.24" - Average rainfall in November:
0.51" - Average rainfall in December:
0.75"
The wettest month (with the highest rainfall) is February (0.98").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days
Clayton, CA
- Average rainfall days in January:
7.2 days - Average rainfall days in February:
5.6 days - Average rainfall days in March:
8.6 days - Average rainfall days in April:
5.6 days - Average rainfall days in May:
3 days - Average rainfall days in June:
1.3 days
- Average rainfall days in July:
1.4 days - Average rainfall days in August:
0.8 days - Average rainfall days in September:
1.8 days - Average rainfall days in October:
2.5 days - Average rainfall days in November:
4.7 days - Average rainfall days in December:
7.5 days
The month with the highest number of rainy days is March (8.6 days).
The month with the least rainy days is August (0.8 days).
Average daylight / Average sunshine
Clayton, CA
- Average daylight in January:
9h and 54min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 12min - Average daylight in June:
14h and 48min
- Average daylight in July:
14h and 30min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 6min - Average daylight in December:
9h and 36min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
6h and 0min - Average sunshine in February:
6h and 6min - Average sunshine in March:
8h and 0min - Average sunshine in April:
10h and 24min - Average sunshine in May:
11h and 0min - Average sunshine in June:
11h and 48min
- Average sunshine in July:
12h and 6min - Average sunshine in August:
11h and 54min - Average sunshine in September:
11h and 12min - Average sunshine in October:
7h and 6min - Average sunshine in November:
6h and 30min - Average sunshine in December:
5h and 48min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days
Clayton, CA
- Average sunshine days in January:
22.8 days - Average sunshine days in February:
21.9 days - Average sunshine days in March:
21.7 days - Average sunshine days in April:
23.9 days - Average sunshine days in May:
27.3 days - Average sunshine days in June:
28.3 days
- Average sunshine days in July:
29.1 days - Average sunshine days in August:
29.4 days - Average sunshine days in September:
27.9 days - Average sunshine days in October:
27.9 days - Average sunshine days in November:
24.3 days - Average sunshine days in December:
22.6 days
The month with the most sunshine days is August (29.4 days).
The month with the least sunshine days is March (21.7 days).
Average UV index
Clayton, CA
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover
Clayton, CA
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility
Clayton, CA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
