The best times to visit Thornton for ideal weather are

May 21st to October 7th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.

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Weather in Thornton

Temperature

Average temperatures in Thornton vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a very low chance of rain or snow throughout the year. The area is somewhat temperate — in the 43rd percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Thornton, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 93.8°F (34.3°C) with temperatures rarely dropping below 59.9°F (15.5°C) at night.

Thornton Temperatures (Fahrenheit)

Key
High
Average
Low

Thornton Temperatures (Celsius)

Key
High
Average
Low

“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Thornton Perceived Temperature (F)

Key
High
Average
Low

Thornton Perceived Temperature (C)

Key
High
Average
Low

 

Average Thornton Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 46.6 30.5 16.9
Feb 47.6 31 17.4
Mar 60.7 42.5 27.1
Apr 65.4 47.5 32.1
May 73.3 56.4 41.4
Jun 87.1 68.8 52
Jul 92 74.3 59
Aug 90.7 72.8 57.6
Sep 83.5 65 49.6
Oct 69.4 51.3 36.9
Nov 58.5 40.3 25.6
Dec 45.3 29.1 15.8

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 8.1 -0.8 -8.4
Feb 8.7 -0.6 -8.1
Mar 15.9 5.8 -2.7
Apr 18.6 8.6 0.1
May 22.9 13.6 5.2
Jun 30.6 20.4 11.1
Jul 33.3 23.5 15
Aug 32.6 22.7 14.2
Sep 28.6 18.3 9.8
Oct 20.8 10.7 2.7
Nov 14.7 4.6 -3.6
Dec 7.4 -1.6 -9


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Thornton are January, December, and then March. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid January. For example, on the week of January 15th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early to mid May with an average of 2 days of significant precipitation the week of May 7th.

When can you find snow in Thornton? Weather stations report large amounts of snow likely to be deepest around January, especially close to late January. The best time to ski (if at all) in Thornton is often around around October 22nd when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chanceof Precipitation

The graph below shows the % chance of rainy and snowy days in Thornton.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Thornton (in).

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 4% 4.3 0.4
Feb 7% 3.7 0.5
Mar 6% 2.8 0.6
Apr 14% 2.9 1.9
May 16% 1.9 2.2
Jun 13% 0 1.8
Jul 13% 0 2.1
Aug 11% 0 1.8
Sep 11% 0 1.6
Oct 11% 2.8 1.4
Nov 7% 1.9 0.6
Dec 5% 2.4 0.4

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 4 10.9 1
Feb 7 9.4 1.3
Mar 6 7.1 1.5
Apr 14 7.4 4.8
May 16 4.8 5.6
Jun 13 0 4.6
Jul 13 0 5.3
Aug 11 0 4.6
Sep 11 0 4.1
Oct 11 7.1 3.6
Nov 7 4.8 1.5
Dec 5 6.1 1

 

Humidity and Wind

Thornton has some comfortably humid months, and slightly dry months in the opposite season. The least humid month is March (31.8% relative humidity), and the most humid month is February (43.9%).

Wind in Thornton is usually moderate. The windiest month is April, followed by March and May. April’s average wind speed of around 10.2 knots (11.8 MPH or 19 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early to mid April where average top sustained speeds reach 21.8 knots, which is considered a fresh breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Thornton.

Key
Avg. Relative Humidity

Wind

The graph below shows wind speed (max and average) in knots.

Key
Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 8.5 Gentle breeze 15.9 Significant breeze
Feb 8.7 Gentle breeze 17.6 Strong breeze
Mar 9.3 Gentle breeze 18.9 Significant breeze
Apr 10.2 Gentle breeze 20.5 Strong breeze
May 8.9 Gentle breeze 19.3 Significant breeze
Jun 8.9 Gentle breeze 19.9 Strong breeze
Jul 8.2 Gentle breeze 19.8 Significant breeze
Aug 7.9 Gentle breeze 18.3 Strong breeze
Sep 7.9 Gentle breeze 16.3 Significant breeze
Oct 8.1 Gentle breeze 16.1 Significant breeze
Nov 8.2 Gentle breeze 15.6 Significant breeze
Dec 8.1 Gentle breeze 15.7 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 41.2%
Feb 43.9%
Mar 31.8%
Apr 36.5%
May 41.3%
Jun 33.9%
Jul 34.8%
Aug 33.2%
Sep 32.8%
Oct 37.4%
Nov 34.6%
Dec 43.8%

 

Is it Safe to Travel to Thornton?

Our best data indicates this area is generally safe. As of Jan 19, 2018 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories


 

The Busiest and Least Crowded Months

The busiest month for tourism in Thornton, CO, US is August, followed by September and May. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Thornton in October. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is slightly extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 51.9 in October means 51.9% of the tourists vs. August.


Overall Thornton Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 81.5°F (27.5°C) and 50.9°F (10.5°C) with warmer temperatures in the later months. Rain is rare with 2 to 5 days of significant precipitation per month. Spring is fairly slow for tourism, which makes it a good time for those looking for deals.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see the most precipitation with 3 to 4 days of precipitation per month. June – August is the busiest season for tourism in Thornton, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 86.8°F (30.4°C) and 53.8°F (12.1°C), which will feel chilly given the humidity and wind. It rains or snows a normal amount: 2 to 3 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is far too cold this time of year in Thornton to be enjoyable for warm weather travelers. The average high during this season is between 50.9°F (10.5°C) and 39.6°F (4.2°C). On average, it rains or snows a smalll amount: 1 to 2 times per month. These times of year are the second busiest with tourists.

 

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