Frost Advisory FROST ADVISORY - Adams County

Current Radar
Thornton, Colorado current radar
Click for larger view
Current Webcam
Thornton, Colorado current webcam image
Click for larger view
Latest News
powered by Surfing Waves
spacer
METRIC | IMPERIAL
Updated: 19-May-2026 @ 1:40am   (0 sec ago)
Temperature Current Conditions Forecast / Storm Prediction
Currently Outside: Colder 0.2°F than last hour.

38.3°F

Wind Chill:  38.3°F
24-hr diff: -5.1°FColder 5.1°F than yesterday at this time.
Cold
High Today
39.0°F
12:03 AM
Low Today
38.2°F
1:13 AM
Yest High
45.1°F
12:58 AM
Yest Low
38.7°F
11:52 PM
Sta* High
91.0°F
2020
Sta* Low
32.2°F
2017
* This Station's Records Since 11/2006
Night time, Dry, Mostly cloudy Night time, Dry, Mostly cloudy

Wind from NNE Wind:  NNE
1.0

Gusting to:
3.0 mph
Current Rain Rain:
0.01 in
Chandler Burning Index: LOW Current CBI
Fire Danger:
-1.5 of 100
Overnight

Overnight: Patchy Fog
Patchy Fog
Tuesday

Tuesday: Patchy Fog
Patchy Fog
Tuesday
Night
Tuesday Night: Chance Rain Showers
Chance Rain Showers
Lo 35°F Hi 50°F Lo 39°F
SPC Activity Map
Dew Point Liquid Precipitation Wind Speed Sun/Moon
Current: No Change 34.5°F
Last Hour: No Change +0.0°F
High 12:00 AM: 35.9°F
Low 12:59 AM: 33.9°F
Record High: 73.2°F on
3-Aug-2007
Record Low: -17.3°F on
16-Jan-2024
Wetbulb: 36.8°F
Rain Today
rain graph

Today: 0.01 in
Storm Rain: 0.69 in
Yesterday: 0.58 in
Last 7 Days: 0.68 in
May Rain: 1.60 in
May to Date
  Avg:10
2.10 in
May to Date
  Diff from Avg:10
Under 0.5 in for the month 0.50 in
May Avg: 2.98 in
Diff from Avg: Under 1.38 in for the month 1.38 in
Season:1 2.95 in
YTD
  Avg:11
5.76 in
YTD
  Diff from Avg:11
Under 2.81 in for the year 2.81 in
Last Rain
Time/Date:
19-May-2026
at 12:08 AM
22 rain days in 2026
7 days in May
0 days since last rain
Current: NNE  1.0 mph
1Hr Average: 5.3 mph
Wind Run: 9.08 miles
Wind Gust
Current: 3.0 mph
Today: 14.0 mph 12:08 AM
Month: 41.1 mph 9-May
Year: 43.0 mph 25-Feb
Record Gust: 62.1 mph
17-Apr-2018
Sunlight:
14 h 29 m 9 s
of Sunlight Yesterday
14 h 30 m 51 s
of Sunlight Today
Which is
1 min 42 sec longer than
yesterday
14 h 32 m 32 s
of Sunlight Tomorrow
(Noon) graph (Midnight)
Legend

Waxing Crescent
Waxing Crescent, 2 days, 11 hours, 41 minutes in cycle
8%
Illuminated
Humidity Barometer
Current: Increased 1% since last hour. 86%
Last Hour: Increased 1% since last hour. 1%
High 12:00 AM: 89%
Low 12:48 AM: 84%
Record High: 100%
12-Feb-2007
Record Low: 0%
1-Jan-2008
Current: Rising 0.029  inHg/hr 30.038 inHg
Last Hour: Rising slowly
High 1:35 AM: 30.039
Low 12:02 AM: 29.996
Record High: 31.086 inHg
30-Dec-2014
Record Low: 25.130 inHg
17-Dec-2006
Heating Degree Days Snow3 Wind Chill Air
Today: 1.6
May: 161.2
2026 to Date: 2344.2
Cooling Degree Days
2026 to Date: 57.8
Today: 0.00 in
Yesterday: 0.00 in
May Snow: Over 3.828 in for the month 5.60 in
May Avg: 1.77 in
Diff from Avg: 3.83 in
Season Total:2 28.00 in
Snow Depth: 0.00 in
2 snow days in May
13 snow days this season.2
First Snow of Season:
28-Nov-2025
Average 1st Snow:
29 of Oct
Current: 38.3°F
Low 12:38 AM: 32.2°F
Yesterday: 32.2°F
Record: -31.0°F
22-Dec-2022
Quality
Index6:

30


Good
Density:
1.28 kg/m3
UV Summary/Forecast Solar Summary
High Yest:   2.7 @ 1:37 PM
May-19

8.1
May-20

8.7
May-21

8.0
High Yest:   680.0 @ 5:01 PM
Sun Hours Today:
00:00
   This Month: 91:50 Hrs
Rise: 5:41 am  Set: 8:10 pm
Almanac Irrigation Index5 Station All Time Records Cloud Level
Currently: Night
YTD Avg Temp: 48.0°F
Sunrise: 5:41 am
Sunset: 8:10 pm
Moonrise: 8:02 am
Moonset: 11:00 pm
Full Moon: 31-May-2026
New Moon: 02:55 UTC
14-Jun-2026
Updated at Midnight
Current ET: 0.02 in
7-Days Rain: 0.68 in
7-Days ET: 1.50 in
7-Day:  0.816 in water in deficit of what evaporated in last 7 days. 0.816 in
May:  1.88 in water in deficit of what evaporated this month. 1.88 in
Support this Site!
Your donation helps support this site
HIGHS: LOWS:
102.9°F
25-Jun-2012
-14.6°F
2-Feb-2011
Daytime Records
  100.6°F°F
12-Jul-2024
  -8.1°F°F
22-Dec-2022
Nitetime Records
  88.0°F°F
15-Aug-2012
  -10.7°F°F
02-Feb-2011
ICN:1 | S3C2:1 | Ajax 3.xx
ISS:Ok | CON:4.7 | RCP:99%
1 Rain season: Jan 1st to Dec 31st.   2 Snow season July 1st to June 30th.   3 Snow manually measured usually around 5AM and 5PM.   5 Estimated amount of water needed to replace the water used by plants and evaporation from the past week. (Negative numbers mean amount of water needed, positive numbers mean excess water is present).   6 Air Quality Index is provided by Colorado Department of Public Health & Environment.   10 Historical average only to day 19 of just the month of May for this station since 2006.   11 Historical average rain this season to day 19 of May for this station since 2006.
 NWS Weather Forecast  -   Outlook Overnight & Tuesday
Overnight

Overnight: Patchy Fog
Patchy Fog

Lo 35°F
NWS forecast: A chance of rain showers and patchy fog before 3am, then patchy fog and a slight chance of rain and snow showers. Cloudy. Low around 35, with temperatures rising to around 37 overnight. North northeast wind 2 to 7 mph. Chance of precipitation is 30%.
Tuesday

Tuesday: Patchy Fog
Patchy Fog

Hi 50°F
NWS forecast: Patchy fog and a slight chance of rain and snow showers before 3pm, then a chance of showers and thunderstorms. Cloudy. High near 50, with temperatures falling to around 48 in the afternoon. East northeast wind 1 to 7 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
 NWS Short Term Weather Forecast
Tuesday
Night
Tuesday Night: Chance Rain Showers
Chance Rain Showers
Wednesday

Wednesday: Slight Chance Rain Showers then Chance Showers And Thunderstorms
Slight Chance Rain Showers then Chance Showers And T-Storms
Wednesday
Night
Wednesday Night: Chance Showers And Thunderstorms then Mostly Cloudy
Chance Showers And T-Storms then Mostly Cloudy
Thursday

Thursday: Partly Sunny then Chance Showers And Thunderstorms
Partly Sunny then Chance Showers And T-Storms
Thursday
Night
Thursday Night: Showers And Thunderstorms Likely
Showers And T-Storms Likely
Friday

Friday: Chance Rain Showers then Chance Showers And Thunderstorms
Chance Rain Showers then Chance Showers And T-Storms
Friday
Night
Friday Night: Slight Chance Showers And Thunderstorms then Mostly Cloudy
Slight Chance Showers And T-Storms then Mostly Cloudy
Lo 39°F Hi 59°F Lo 41°F Hi 67°F Lo 43°F Hi 65°F Lo 44°F
Click here for the complete forecast.
ajax-dashboard6.php - Version 6.95h - 20-Feb-2023 - Script by: Scott of BurnsvilleWeatherLIVE.com
Now supported by Saratoga-weather.org Download