Climate and monthly weather forecast
Thornton, CO

Weather in January

January, like December, in Thornton, Colorado, is a wintry winter month, with an average temperature ranging between min 23.2°F (-4.9°C) and max 42.4°F (5.8°C). In January, the average high-temperature is practically the same as in December - a still cold 42.4°F (5.8°C). Weather in January »

Weather in February

February, the last month of the winter in Thornton, is also a wintry month, with an average temperature fluctuating between 42.4°F (5.8°C) and 22.5°F (-5.3°C). In February, the average high-temperature remains the same as in January - a still cold 42.4°F (5.8°C). Weather in February »

Weather in March

March, the first month of the spring in Thornton, is a cool month, with temperature in the range of an average low of 31.5°F (-0.3°C) and an average high of 54.1°F (12.3°C). In March, the average high-temperature increases from a cold 42.4°F (5.8°C) in February to a fresh 54.1°F (12.3°C). Weather in March »

Weather in April

April in Thornton, Colorado, is a moderate spring month, with temperature in the range of an average high of 60.3°F (15.7°C) and an average low of 36.1°F (2.3°C). In Thornton, the average high-temperature in April marginally rises from a fresh 54.1°F (12.3°C) in March to a mild 60.3°F (15.7°C). Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in Thornton, Colorado, with an average temperature varying between 69.1°F (20.6°C) and 44.4°F (6.9°C). In May, the average high-temperature slightly increases from a moderate 60.3°F (15.7°C) in April to an agreeable 69.1°F (20.6°C). Weather in May »

Weather in June

June, the first month of the summer in Thornton, is a warm month, with an average temperature varying between 84.2°F (29°C) and 56.5°F (13.6°C). In Thornton, the average high-temperature in June increases considerably from an agreeable 69.1°F (20.6°C) in May to a warm 84.2°F (29°C). Weather in June »

Weather in July

July in Thornton, Colorado, is a tropical summer month, with an average temperature fluctuating between 61.7°F (16.5°C) and 88.3°F (31.3°C). The warmest month is July, with an average high-temperature of 88.3°F (31.3°C) and an average low-temperature of 61.7°F (16.5°C). The average heat index in July is calculated to be a hot 89.6°F (32°C). Weather in July »

Weather in August

August, the last month of the summer in Thornton, is another tropical month, with an average temperature varying between 60.3°F (15.7°C) and 87.1°F (30.6°C). In August, the average high-temperature is relatively the same as in July - a still tropical 87.1°F (30.6°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Thornton, Colorado, with temperature in the range of an average high of 79.5°F (26.4°C) and an average low of 53.8°F (12.1°C). In Thornton, the average high-temperature in September marginally drops from a tropical 87.1°F (30.6°C) in August to a warm 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 ranging between max 63.3°F (17.4°C) and min 40.1°F (4.5°C). In October, the average high-temperature declines considerably from a moderately hot 79.5°F (26.4°C) in September to an enjoyable 63.3°F (17.4°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cool month in Thornton, Colorado, with an average temperature ranging between max 52.7°F (11.5°C) and min 30.6°F (-0.8°C). In Thornton, the average high-temperature in November drops from a comfortable 63.3°F (17.4°C) in October to a cool 52.7°F (11.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Thornton, Colorado, with temperature in the range of an average low of 21.9°F (-5.6°C) and an average high of 41.2°F (5.1°C). With an average high-temperature of 41.2°F (5.1°C) and an average low-temperature of 21.9°F (-5.6°C), December is the coldest month. Weather in December »
[Resources]

FAQ

What is the driest month in Thornton?

January and December are months with the least rain in Thornton, Colorado, when the rain falls for 2.3 days and typically aggregates up to 0.08" (2mm) of rain.

How much does it rain in Thornton?

In Thornton, during the entire year, the rain falls for 48.3 days and collects up to 3.19" (81mm) of precipitation.

When does it snow in Thornton?

January through May, October through December are months with snowfall in Thornton.

How many days does it snow in Thornton?

In Thornton, during the entire year, snow falls for 19.6 days and aggregates up to 8.5" (216mm) of snow.

What is the month with the lowest UV index in Thornton?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Thornton.

What is the most humid month in Thornton?

With an average relative humidity of 64%, February is the most humid month in Thornton, Colorado.

What is the month with the least sunshine in Thornton?

The month with the least sunshine in Thornton is February, with an average of 6.7h of sunshine.

When is Daylight Saving Time (DST) in Thornton?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts in Thornton, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from MDT to MST.

When it does not snow in Thornton?

In Thornton, snow does not fall in June through September.

When are the longest days in Thornton?

With an average of 14h and 57min of daylight, June has the longest days of the year in Thornton.

What are the months with the most sunshine in Thornton?

June and July, with an average of 11.9h of sunshine, are months with the most sunshine.

What is the month with the highest UV index in Thornton?

June through August, with an average maximum UV index of 6, are months with the highest UV index.

What is the warmest month in Thornton?

The warmest month in Thornton is July, with an average high-temperature of 88.3°F (31.3°C) and an average low-temperature of 61.7°F (16.5°C).

What is the wettest month in Thornton?

July is the month with the most rainfall. Rain falls for 8.2 days and accumulates 0.59" (15mm) of precipitation.

What is the least humid month in Thornton?

The least humid month in Thornton is August, with an average relative humidity of 39%.

What is the snowiest month in Thornton?

October is the month with the most snowfall. Snow falls for 1.7 days and accumulates 1.42" (36mm) of snow.

What is the coldest month in Thornton?

With an average high-temperature of 41.2°F (5.1°C) and an average low-temperature of 21.9°F (-5.6°C), December is the coldest month.

What is the month with the shortest days in Thornton?

The month with the shortest days in Thornton is December, with an average of 9h and 24min of daylight.

Average temperature
Thornton, CO

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).

[Resources]

Average pressure
Thornton, CO

Average pressure - Thornton, CO

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).

[Resources]

Average wind speed
Thornton, CO

Average wind speed - Thornton, CO

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).

[Resources]

Average rainfall
Thornton, CO

Average rainfall - Thornton, CO

The wettest month (with the highest rainfall) is July (0.59").
The driest months (with the least rainfall) are January and December (0.08").

[Resources]

Average rainfall days
Thornton, CO

Average rainfall days - Thornton, CO

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).

[Resources]

Average snowfall
Thornton, CO

Average snowfall - Thornton, CO

The month with the highest snowfall is October (1.42").
The months with the least snowfall are June, July, August and September (0").

[Resources]

Average snowfall days
Thornton, CO

Average snowfall days - Thornton, CO

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).

[Resources]

Average daylight / Average sunshine
Thornton, CO

Average daylight / Average sunshine - Thornton, CO

The month with the longest days is June (Average daylight: 14h and 57min).
The month with the shortest days is December (Average daylight: 9h and 24min).

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).

[Resources]

Average sunshine days
Thornton, CO

Average sunshine days - Thornton, CO

The month with the most sunshine days is December (28.5 days).
The month with the least sunshine days is July (19.6 days).

[Resources]

Average UV index
Thornton, CO

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).

[Resources]

Average visibility
Thornton, CO

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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location