Climate and monthly weather forecastThornton, CA
Climate and monthly weather forecast
Weather in January
January is a mild winter month in Thornton, California, with temperature in the range of an average high of 56.7°F (13.7°C) and an average low of 41.2°F (5.1°C). At the onset of January, Thornton records an average high-temperature of a refreshing 56.7°F (13.7°C), showing little deviation from the preceding month. Weather in January »Weather in February
February, the last month of the winter in Thornton, is another refreshing month, with an average temperature varying between 59.7°F (15.4°C) and 41.5°F (5.3°C). The arrival of February sees a recorded average high-temperature of a still mild 59.7°F (15.4°C), showing little divergence from the previous month's conditions. Weather in February »Weather in March
March, the first month of the spring in Thornton, is a comfortable month, with an average temperature fluctuating between 63.5°F (17.5°C) and 43.3°F (6.3°C). The arrival of March brings an average high-temperature of a comfortable 63.5°F (17.5°C), subtly diverging from February's 59.7°F (15.4°C). Weather in March »Weather in April
April is an agreeable spring month in Thornton, California, with an average temperature fluctuating between 69.8°F (21°C) and 46.2°F (7.9°C). In Thornton, the average high-temperature in April slightly rises, from a comfortable 63.5°F (17.5°C) in March, to an agreeable 69.8°F (21°C). Weather in April »Weather in May
The last month of the spring, May, is a warm month in Thornton, California, with an average temperature ranging between min 51.1°F (10.6°C) and max 77.7°F (25.4°C). Observing a minor shift, the average high-temperature during May adjusts from April's agreeable 69.8°F (21°C) to a moderately hot 77.7°F (25.4°C). Weather in May »Weather in June
June, the first month of the summer in Thornton, is a tropical month, with an average temperature varying between 56.7°F (13.7°C) and 88.2°F (31.2°C). Thornton's transition into June sees a rise in the average high-temperature, advancing from a moderately hot 77.7°F (25.4°C) in May to a tropical 88.2°F (31.2°C). Weather in June »Weather in July
July, like June, is another hot summer month in Thornton, California, with an average temperature fluctuating between 93.9°F (34.4°C) and 58.6°F (14.8°C). Thornton experiences its highest average temperatures in July, reaching a peak of 93.9°F (34.4°C) and a minimum of 58.6°F (14.8°C). July's heat index is estimated at a torrid 100.4°F (38°C). Weather in July »Weather in August
August, the last month of the summer in Thornton, is another tropical month, with an average temperature fluctuating between 93°F (33.9°C) and 58.8°F (14.9°C). The advent of August brings an average high-temperature of a still tropical 93°F (33.9°C), exhibiting minor difference from the previous month. Weather in August »Weather in September
The first month of the autumn, September, is still a hot month in Thornton, California, with an average temperature fluctuating between 88.5°F (31.4°C) and 58.6°F (14.8°C). Thornton records an average high-temperature of a still hot 88.5°F (31.4°C) in September, closely mirroring the climate of the previous month. Weather in September »Weather in October
October, like September, in Thornton, California, is a moderately hot autumn month, with an average temperature varying between 53.6°F (12°C) and 76.8°F (24.9°C). October implies a gentle temperature shift, with average high-temperatures reducing from September's hot 88.5°F (31.4°C) to a moderately hot 76.8°F (24.9°C). Weather in October »Weather in November
November, the last month of the autumn in Thornton, is also an enjoyable month, with an average temperature varying between 45.7°F (7.6°C) and 64°F (17.8°C). With November's onset, the weather shows a temperature decrease, transitioning from a warm 76.8°F (24.9°C) in October to a refreshing 64°F (17.8°C). Weather in November »Weather in December
The first month of the winter, December, is also a fresh month in Thornton, California, with an average temperature ranging between max 55°F (12.8°C) and min 41°F (5°C). Temperature readings reach their annual highs in December, averaging 55°F (12.8°C) and a minimum average of 41°F (5°C). Weather in December »Updated: Aug 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
Throughout the year, there are 63.8 rainfall days, and 12.6" (320mm) of precipitation is accumulated.
In Thornton, snow does not fall in January through November.
Throughout the year, there are 0.1 snowfall days.
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.
February is the month with the most rainfall. Rain falls for 8 days and accumulates 2.4" (61mm) of precipitation.
With an average relative humidity of 75%, March is the most humid month.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Thornton, 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.
With an average maximum UV index of 7, June is the month with the highest UV index.
July, noted for its average high-temperature of 93.9°F (34.4°C) and an average low-temperature of 58.6°F (14.8°C), is considered the warmest month.
The least humid month is July, with an average relative humidity of 45%.
The months with the least rainfall are July and August Rain falls for 1.4 days and accumulates 0.04" (1mm) of rain.
With an average of 12.1h of sunshine, July has the most sunshine of the year.
Thornton's coldest month, December, registers temperatures that range from a high of 55°F (12.8°C) to a low of 41°F (5°C).
The only month with snowfall is December.
The month with the most snowfall days is December, when snow falls for 0.1 days.
December has the shortest days of the year, with an average of 9h and 36min of daylight.
With an average of 5.9h of sunshine, December has the least sunshine of the year.
Average temperature
Thornton, CA
The warmest month (with the highest average high temperature) is July (93.9°F).
The month with the lowest average high temperature is December (55°F).
The month with the highest average low temperature is August (58.8°F).
The coldest month (with the lowest average low temperature) is December (41°F).
Average pressure
Thornton, CA
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
30.02"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.92"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Thornton, CA
- Average wind speed in January:
4.8mph - Average wind speed in February:
5.8mph - Average wind speed in March:
5.5mph - Average wind speed in April:
5.5mph - Average wind speed in May:
5.7mph - Average wind speed in June:
5.8mph
- Average wind speed in July:
5.6mph - Average wind speed in August:
5.2mph - Average wind speed in September:
4.6mph - Average wind speed in October:
4.7mph - Average wind speed in November:
4.4mph - Average wind speed in December:
5.2mph
The windiest months (with the highest average wind speed) are February and June (5.8mph).
The calmest month (with the lowest average wind speed) is November (4.4mph).
Average humidity
Thornton, CA
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (45%).
Average rainfall
Thornton, CA
- Average rainfall in January:
2.01" - Average rainfall in February:
2.4" - Average rainfall in March:
2.28" - Average rainfall in April:
0.98" - Average rainfall in May:
0.71" - Average rainfall in June:
0.12"
- Average rainfall in July:
0.04" - Average rainfall in August:
0.04" - Average rainfall in September:
0.08" - Average rainfall in October:
0.59" - Average rainfall in November:
1.38" - Average rainfall in December:
1.97"
The wettest month (with the highest rainfall) is February (2.4").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days
Thornton, CA
- Average rainfall days in January:
8.5 days - Average rainfall days in February:
8 days - Average rainfall days in March:
12.4 days - Average rainfall days in April:
7.8 days - Average rainfall days in May:
4.8 days - Average rainfall days in June:
0.9 days
- Average rainfall days in July:
1.4 days - Average rainfall days in August:
1.2 days - Average rainfall days in September:
1.5 days - Average rainfall days in October:
3.2 days - Average rainfall days in November:
5.9 days - Average rainfall days in December:
8.2 days
The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is June (0.9 days).
Average snowfall days
Thornton, CA
- Average snowfall days in January:
0 days - Average snowfall days in February:
0 days - Average snowfall days in March:
0 days - Average snowfall days in April:
0 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 days - Average snowfall days in December:
0.1 days
The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight / Average sunshine
Thornton, 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 18min - 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 6min - Average sunshine in February:
6h and 18min - Average sunshine in March:
8h and 0min - Average sunshine in April:
10h and 12min - Average sunshine in May:
11h and 12min - Average sunshine in June:
11h and 48min
- Average sunshine in July:
12h and 6min - Average sunshine in August:
12h and 0min - Average sunshine in September:
11h and 18min - Average sunshine in October:
7h and 12min - Average sunshine in November:
6h and 42min - Average sunshine in December:
5h and 54min
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 54min).
Average sunshine days
Thornton, CA
- Average sunshine days in January:
21.8 days - Average sunshine days in February:
19.3 days - Average sunshine days in March:
17.8 days - Average sunshine days in April:
21.7 days - Average sunshine days in May:
25.5 days - Average sunshine days in June:
28.5 days
- Average sunshine days in July:
28.9 days - Average sunshine days in August:
29.3 days - Average sunshine days in September:
27.5 days - Average sunshine days in October:
27.1 days - Average sunshine days in November:
23.7 days - Average sunshine days in December:
21.8 days
The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is March (17.8 days).
Average UV index
Thornton, CA
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover
Thornton, CA
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility
Thornton, 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).
