The best times to visit Thornton for ideal weather are

May 28th to July 8th


August 27th 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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Thornton Travel Guide

  • Safety
  • The busiest and least popular months
  • Overall travel experience by time of year
  • Weather in Thornton


    Average temperatures in Thornton vary somewhat and are temperate for much of the year. The area is in the top 34 percent of tourist destinations for pleasant weather. 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 late June where highs are regularly around 68.7°F (20.4°C) with temperatures rarely dropping below 45.2°F (7.3°C) at night.

    Thornton Temperatures (Fahrenheit)


    Thornton Temperatures (Celsius)


    “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)


    Thornton Perceived Temperature (C)



    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 47.2 32.8 20.9
    Feb 46.2 31.8 20.5
    Mar 60.1 43.7 30.4
    Apr 64.4 48.5 35.2
    May 71.3 56.3 43.5
    Jun 86.3 69.7 54.5
    Jul 90.3 74.4 60.5
    Aug 89.7 73.4 59.2
    Sep 82.4 65.6 51.6
    Oct 68 52.1 39.4
    Nov 56.1 40.5 28.2
    Dec 45 31.1 20.1

    Show Celsius

    Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
    Jan 8.4 0.4 -6.2
    Feb 7.9 -0.1 -6.4
    Mar 15.6 6.5 -0.9
    Apr 18 9.2 1.8
    May 21.8 13.5 6.4
    Jun 30.2 20.9 12.5
    Jul 32.4 23.6 15.8
    Aug 32.1 23 15.1
    Sep 28 18.7 10.9
    Oct 20 11.2 4.1
    Nov 13.4 4.7 -2.1
    Dec 7.2 -0.5 -6.6


    Precipitation (Rain or Snow)

    If dry weather is what you’re after, the months with the lowest chance of precipitation in Thornton are May, July, and then April. The lowest chance of rain or snow occurs around early September. For example, on the week of September 3rd there are only 0.3 days of precipitation on average. By contrast, it’s most likely to rain or snow in mid-May with an average of 1.9 days with significant precipitation the week of May 14th.

    When can you find snow in Thornton? Weather stations report no annual snow. 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.

    Chance of Precipitation

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

    Days with precipitation

    Snow on the Ground

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

    Snow depth

    Average Rain and Snow by Month

    Show Inches

    Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
    Jan 8.6 2.2 0.01
    Feb 11.4 1.8 0.01
    Mar 10 1.4 0.01
    Apr 15.7 1.4 0.03
    May 18.6 0.9 0.04
    Jun 11.4 0 0.03
    Jul 15.7 0 0.03
    Aug 12.9 0 0.03
    Sep 11.4 0 0.03
    Oct 11.4 1.4 0.02
    Nov 8.6 1 0.01
    Dec 11.4 1.2 0.01

    Show Centimeters

    Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
    Jan 8.6 5.6 0.03
    Feb 11.4 4.6 0.03
    Mar 10 3.6 0.03
    Apr 15.7 3.6 0.08
    May 18.6 2.3 0.1
    Jun 11.4 0 0.08
    Jul 15.7 0 0.08
    Aug 12.9 0 0.08
    Sep 11.4 0 0.08
    Oct 11.4 3.6 0.05
    Nov 8.6 2.5 0.03
    Dec 11.4 3 0.03


    Humidity and Wind

    Thornton has far below average humidity compared to most tourist destinations. The least humid month is August (30.7% relative humidity), and the most humid month is February (44.1%).

    Wind in Thornton is usually moderate. The windiest month is April, followed by March and January. April’s average wind speed of around 7.6 knots (8.7 MPH or 14.1 KPH) is considered “gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late March where average top sustained speeds reach 19.7 knots, which is considered a fresh breeze.

    Relative Humidity (%)

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

    Avg. Relative Humidity


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

    Max Sustained Wind
    Average Daily Wind

    Average Wind Speeds

    Show Wind Speeds

    All wind speeds are in knots.

    Month Avg. Wind Meaning (Beaufort) Avg. Maximum Sustained Wind Meaning (Beufort)
    Jan 6.7 a light breeze 15.7 a moderate breeze
    Feb 6.6 a light breeze 16.2 a moderate breeze
    Mar 7.1 a gentle breeze 17.2 a moderate breeze
    Apr 7.6 a gentle breeze 17.9 a fresh breeze
    May 6.6 a light breeze 16.5 a moderate breeze
    Jun 6.3 a light breeze 16.3 a moderate breeze
    Jul 5.8 a light breeze 16.6 a moderate breeze
    Aug 5.7 a light breeze 15.5 a moderate breeze
    Sep 5.6 a light breeze 13.9 a moderate breeze
    Oct 5.8 a light breeze 14.3 a moderate breeze
    Nov 6.2 a light breeze 14.6 a moderate breeze
    Dec 6 a light breeze 14.2 a moderate breeze

    Show Relative Humidity by Month

    Month Avg. Relative Humidity
    Jan 38.5
    Feb 44.1
    Mar 31.5
    Apr 35.8
    May 41.8
    Jun 32.2
    Jul 34.7
    Aug 30.7
    Sep 32.7
    Oct 37.5
    Nov 35.3
    Dec 42.6


    Is it Safe to Travel to Thornton?

    As of 6/22/2017 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.

    Overall Thornton Travel Experience by Season

    Spring (March through May)

    Humidity and temperatures combine to make this season feel moderately cold. Highs range from 60.1°F (15.6°C) and 36.3°F (2.4°C) with warmer temperatures in the later months. Rain is somewhat common with 3 to 6 days of precipitation per month. Spring is slow/unreported 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 moderate precipitation with 3 to 5 days of precipitation per month. June – August is slow/unreported season for tourism in Thornton, so lodging and other accommodations may cost as much as usual.

    Fall (September through November)

    Fall daily highs range from 64.3°F (17.9°C) and 39°F (3.9°C), which will feel chilly given the humidity and wind. It rains or snows a small amount: 3 to 4 days per month. Tourism is slow/unreported during these months due to the weather, so hotels may be normally 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 38.8°F (3.8°C) and 29.9°F (-1.2°C). On average, it rains or snows a normal amount: 3 to 4 times per month. These times of year are slow/unreported with tourists.


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