Climate and monthly weather forecastThornton, CO
Climate and monthly weather forecast
Weather in January
January, like December, in Thornton, Colorado, is another cold winter month, with an average temperature ranging between min 23.2°F (-4.9°C) and max 42.4°F (5.8°C). Shifting into January, Thornton records an average high-temperature of a still cold 42.4°F (5.8°C), presenting minor fluctuations compared to the previous month. Weather in January »Weather in February
The last month of the winter, February, is also an icy month in Thornton, Colorado, with temperature in the range of an average high of 42.4°F (5.8°C) and an average low of 22.5°F (-5.3°C). The dawn of February brings a marginal shift in the average high-temperature to a still cold 42.4°F (5.8°C), equivalent to January's readings. Weather in February »Weather in March
March, the first month of the spring in Thornton, is a fresh month, with an average temperature varying between 54.1°F (12.3°C) and 31.5°F (-0.3°C). March brings an increase in the average high-temperature, progressing from an icy 42.4°F (5.8°C) in February to a cool 54.1°F (12.3°C). Weather in March »Weather in April
April is a refreshing spring month in Thornton, Colorado, with an average temperature ranging between min 36.1°F (2.3°C) and max 60.3°F (15.7°C). In Thornton, stepping into April brings a gentle temperature nudge, moving slightly up from March's fresh 54.1°F (12.3°C) to a moderate 60.3°F (15.7°C). Weather in April »Weather in May
May, the last month of the spring in Thornton, is an agreeable month, with an average temperature ranging between max 69.1°F (20.6°C) and min 44.4°F (6.9°C). A slight uplift in the average high-temperature marks May, adjusting from April's refreshing 60.3°F (15.7°C) to a pleasant 69.1°F (20.6°C). Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Thornton, Colorado, with an average temperature ranging between min 56.5°F (13.6°C) and max 84.2°F (29°C). With the onset of June, Thornton's weather experiences a distinct temperature rise, moving from a pleasant 69.1°F (20.6°C) in May to a moderately hot 84.2°F (29°C). Weather in June »Weather in July
July is a hot summer month in Thornton, Colorado, with an average temperature fluctuating between 88.3°F (31.3°C) and 61.7°F (16.5°C). In Thornton, the month of July is known for its highest average temperatures, reaching a high of 88.3°F (31.3°C) and a low of 61.7°F (16.5°C). The heat index value during July is estimated at a hot 89.6°F (32°C). Weather in July »Weather in August
August, the last month of the summer in Thornton, is another hot month, with an average temperature varying between 87.1°F (30.6°C) and 60.3°F (15.7°C). Thornton experiences an average high-temperature of a still tropical 87.1°F (30.6°C) in August, subtly different from July's 88.3°F (31.3°C). Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Thornton, Colorado, with an average temperature ranging between max 79.5°F (26.4°C) and min 53.8°F (12.1°C). September's arrival comes with a mild decrease in the average high-temperature, moving subtly from a tropical 87.1°F (30.6°C) in August to a moderately hot 79.5°F (26.4°C). Weather in September »Weather in October
October, the same as September, is another enjoyable autumn month in Thornton, Colorado, with an average temperature fluctuating between 63.3°F (17.4°C) and 40.1°F (4.5°C). Thornton's weather in October is marked by a clear decrease in the average high-temperature, moving down from September's moderately hot 79.5°F (26.4°C) to a comfortable 63.3°F (17.4°C). Weather in October »Weather in November
November, the last month of the autumn in Thornton, is also a fresh month, with an average temperature varying between 52.7°F (11.5°C) and 30.6°F (-0.8°C). In Thornton, the beginning of November is marked by a lowered average high-temperature, shifting from October's refreshing 63.3°F (17.4°C) to a cool 52.7°F (11.5°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 ranging between max 41.2°F (5.1°C) and min 21.9°F (-5.6°C). December, recording an average high temperature of 41.2°F (5.1°C) and a low temperature of 21.9°F (-5.6°C), is Thornton's coldest month. Weather in December »Updated: Aug 15, 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 December are months with the least rain when the rain falls for 2.3 days and typically aggregates up to 0.08" (2mm) of rain.
In Thornton, during the entire year, the rain falls for 48.3 days and collects up to 3.19" (81mm) of precipitation.
January through May, October through December are months with snowfall.
Throughout the year, there are 19.6 snowfall days, and 8.5" (216mm) of snow is accumulated.
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
With an average relative humidity of 64%, February is the most humid month.
February has the least sunshine of the year, with an average of 6.7h of sunshine.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.
In Thornton, Colorado, snow does not fall in June through September.
The month with the longest days is June, with an average of 15h and 0min of daylight.
The months with the most sunshine are June and July, with an average of 11.9h of sunshine.
June through August, with an average maximum UV index of 6, are months with the highest UV index in Thornton.
In Thornton, the average temperatures in July are the highest, with a peak at 88.3°F (31.3°C) and a low of 61.7°F (16.5°C).
July is the month with the most rainfall in Thornton. Rain falls for 8.2 days and accumulates 0.59" (15mm) of precipitation.
With an average relative humidity of 39%, August is the least humid month.
October is the month with the most snowfall. Snow falls for 1.7 days and accumulates 1.42" (36mm) of snow.
In Thornton, December is known for its average lowest temperatures, reaching a high of 41.2°F (5.1°C) and a low of 21.9°F (-5.6°C).
With an average of 9h and 24min of daylight, December has the shortest days of the year.
Average temperature
Thornton, CO
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (41.2°F).
The month with the highest average low temperature is July (61.7°F).
The coldest month (with the lowest average low temperature) is December (21.9°F).
Average pressure
Thornton, CO
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.07"Hg - Average pressure in March:
29.99"Hg - Average pressure in April:
29.91"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
30"Hg - Average pressure in August:
30"Hg - Average pressure in September:
30"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are April and June (29.91"Hg).
Average wind speed
Thornton, CO
- Average wind speed in January:
6.1mph - Average wind speed in February:
6.3mph - Average wind speed in March:
6.7mph - Average wind speed in April:
6.9mph - Average wind speed in May:
6.3mph - Average wind speed in June:
6.5mph
The windiest month (with the highest average wind speed) is April (6.9mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).
Average humidity
Thornton, CO
The month with the highest relative humidity is February (64%).
The month with the lowest relative humidity is August (39%).
Average rainfall
Thornton, CO
- Average rainfall in January:
0.08" - Average rainfall in February:
0.16" - Average rainfall in March:
0.31" - Average rainfall in April:
0.24" - Average rainfall in May:
0.55" - Average rainfall in June:
0.35"
- Average rainfall in July:
0.59" - Average rainfall in August:
0.24" - Average rainfall in September:
0.16" - Average rainfall in October:
0.24" - Average rainfall in November:
0.2" - Average rainfall in December:
0.08"
The wettest month (with the highest rainfall) is July (0.59").
The driest months (with the least rainfall) are January and December (0.08").
Average rainfall days
Thornton, CO
- Average rainfall days in January:
2.3 days - Average rainfall days in February:
1.2 days - Average rainfall days in March:
4.7 days - Average rainfall days in April:
5.3 days - Average rainfall days in May:
6.2 days - Average rainfall days in June:
5.7 days
- Average rainfall days in July:
8.2 days - Average rainfall days in August:
5.3 days - Average rainfall days in September:
3.3 days - Average rainfall days in October:
2.3 days - Average rainfall days in November:
2.1 days - Average rainfall days in December:
1.7 days
The month with the highest number of rainy days is July (8.2 days).
The month with the least rainy days is February (1.2 days).
Average snowfall
Thornton, CO
- Average snowfall in January:
0.71" - Average snowfall in February:
1.22" - Average snowfall in March:
1.1" - Average snowfall in April:
0.91" - Average snowfall in May:
1.26" - Average snowfall in June:
0"
The month with the highest snowfall is October (1.42").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Thornton, CO
- Average snowfall days in January:
3.2 days - Average snowfall days in February:
4.7 days - Average snowfall days in March:
2.8 days - Average snowfall days in April:
2.1 days - Average snowfall days in May:
0.8 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:
1.7 days - Average snowfall days in November:
2.3 days - Average snowfall days in December:
2 days
The month with the highest number of snowfall days is February (4.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Thornton, CO
- Average daylight in January:
9h and 42min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 24min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 42min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
7h and 0min - Average sunshine in February:
6h and 42min - Average sunshine in March:
9h and 6min - Average sunshine in April:
10h and 54min - Average sunshine in May:
11h and 18min - Average sunshine in June:
11h and 54min
- Average sunshine in July:
11h and 54min - Average sunshine in August:
11h and 48min - Average sunshine in September:
11h and 6min - Average sunshine in October:
7h and 30min - Average sunshine in November:
7h and 12min - Average sunshine in December:
7h and 0min
The months with the most sunshine are June and July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 42min).
Average sunshine days
Thornton, CO
- Average sunshine days in January:
27.4 days - Average sunshine days in February:
23.2 days - Average sunshine days in March:
25.3 days - Average sunshine days in April:
22.8 days - Average sunshine days in May:
21.9 days - Average sunshine days in June:
20.1 days
- Average sunshine days in July:
19.6 days - Average sunshine days in August:
22.3 days - Average sunshine days in September:
24.5 days - Average sunshine days in October:
26.7 days - Average sunshine days in November:
26.5 days - Average sunshine days in December:
28.5 days
The month with the most sunshine days is December (28.5 days).
The month with the least sunshine days is July (19.6 days).
Average UV index
Thornton, CO
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 2).
Average cloud cover
Thornton, CO
The months with the most cloud cover are February, April and May (Cloud cover 25).
The month with the least cloud cover is September (Cloud cover 14).
Average visibility
Thornton, CO
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).
