Snow Day Calculator for Thornton, CO
Will Thornton schools be closed tomorrow?
Tomorrow by school district
| District | Closure | Link |
|---|---|---|
| Adams 12 Five Star Schools | — | — |
| Adams County School District 14 | — | — |
| School District 27J | — | — |
Districts serving Thornton ZIP codes (NCES). Chances from the National Weather Service forecast.
Not listed? Enter your ZIP
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Snow by hour
From the National Weather Service forecast, updated hourly. Estimate only. Your district makes the call.
Snow in Thornton: what is normal
- Snow a year
- 45 in.
- Days with 3+ in.
- 4.9
- Days with 1+ in.
- 15.6
NOAA NCEI U.S. Climate Normals 1991–2020, Northglenn, CO station. Averages per year.
Thornton gets snow most winters, so districts plan for it. The calculator scales each storm by this local normal: in Thornton, closures usually take about 8 inches overnight, or ice, or snow at the worst time of the morning. How the calculator works.
What closes schools in Thornton (our model)
| Overnight snow | about 8 inches |
|---|---|
| Ice (freezing rain) | about 0.19 in. |
| Wind chill at bus time | −25°F |
| Normal winter low | 20°F |
Levels where a closure becomes likely in our model, from NOAA normals. Not a district policy.
ZIP codes covered
80241, 80233, 80234
ZIP codes inside or near Thornton. Each has its own forecast; enter yours above for your district.
Thornton snow day questions
Will Thornton, CO schools be closed tomorrow?
The calculator above shows tomorrow's chance of a closure and of a delay for each Thornton-area school district, from tonight's National Weather Service forecast. It updates every hour from the afternoon until morning. It is an estimate: your district makes and announces the decision, often early in the morning or the evening before a big storm.
How much snow does Thornton, CO get?
Thornton averages 45 inches of snow a year, with about 4.9 days a year of 3 inches or more and 15.6 days of an inch or more (NOAA 1991–2020 climate normals, Northglenn, CO station).
How much snow does it take to close schools in Thornton, CO?
Our model treats about 8 inches of snow falling overnight as the level where closures become likely in Thornton, because the area sees 4.9 days a year with 3+ inches and is used to plowing. Ice, a winter storm warning, or heavy snow right at bus time can close schools with less.
Guides
- How much snow cancels school?
From one inch in Atlanta to a foot in Buffalo: what it takes in every state, with NOAA data.
- What time are snow days announced?
When districts decide, how they tell families, and when to check the calculator.
- Wind chill and school closings
How cold is too cold for school, the NWS cold alerts, and local cold lines by city.
- Signs of a snow day tomorrow
The forecast signs that really matter, and the folklore that doesn't.
Nearby
Thornton: did school close today?
Your report improves tomorrow's estimate.