How severe is the forecast, in the terms districts actually use?
Enter the forecast for your area and this tool scores it as a weather severity score from 0 to 100, built only from the factors districts themselves cite when they announce closures: snowfall, ice, wind chill, wind and timing. Read the result for what it is: context, not a prediction. No honest tool can give closure odds without a validated model of your own district’s past decisions, and this page does not pretend to. What it can do is organise the forecast into the shape of the decision, so you can judge the morning the way the people making the call will see it, and plan for both answers.
Disclaimer: This calculator gives estimates for general information only. It is not financial, medical or other professional advice. Only your school district can announce a closure: check its official channels, not this page, on the morning itself.
What this estimator does, and what it refuses to do
A real closure forecast would need two things this page does not have: a record of your district’s past decisions to learn from, and calibration against what actually happened. Tools that print a percentage without those are inventing it. So this estimator does the defensible half of the job: it takes the same inputs a superintendent’s early-morning call is made from (how much snow, how much ice, how cold the wind chill gets, how hard the wind blows, and whether the roads get ploughing time before the buses roll) and scores their combined severity on a published, inspectable scale. The score organises the forecast. The decision stays where it belongs.
How to use it
- Use your most local forecast. Snow bands are narrow; a county forecast can be five inches wrong for your street. The National Weather Service forecast for your exact area is the input this scoring deserves, and ice figures especially should come from it rather than a headline.
- Enter ice even when it looks tiny. A tenth of an inch of ice scores as much as several inches of snow in this scale, because that is how districts treat it: buses cannot grip, and ice arrives with power outages attached.
- Read the band, then read your district line. The same score means different things to a rural district with 40-minute gravel-road bus routes and a city district whose students walk. The results print the reading for the district type you picked.
- Plan for both outcomes at the top bands. The honest use of a high score on Sunday night is not certainty about Monday; it is having the childcare, remote-work and alarm settings ready for either announcement.
The scoring model
- Snowfall: under 1 in = 0; 1 to 3 = 10; over 3 to 6 = 20; over 6 to 10 = 30; over 10 = 40 points.
- Ice: none = 0; a trace under 0.1 in = 10; 0.1 to 0.25 = 20; over 0.25 to 0.5 = 30; over 0.5 = 40 points.
- Wind chill low: above 0°F = 0; 0 to -10 = 5; -11 to -20 = 10; -21 to -30 = 15; below -30 = 20 points.
- Gusts: under 25 mph = 0; 25 to 35 = 5; over 35 to 45 = 10; over 45 = 15 points.
- Timing: worst over before 4 a.m. = minus 5; still snowing at dawn = 0; peaking during the bus runs = plus 5. The total is held between 0 and 100.
- Bands: 0 to 19 low, 20 to 39 moderate, 40 to 59 high, 60 and above severe, describing the weather only.
Worked examples
The serious storm. 8 inches of snow (30), a tenth of an inch of ice (20), wind chill to -15 (10), gusts of 30 (5) and the worst arriving on the morning bus runs (plus 5): the score is 70, in the severe band. Districts announce closures in weather like this routinely, and delays at minimum; the page still will not call it a probability, and neither should anyone planning around it.
The light dusting. 2 inches of snow (10), no ice, a low wind chill of 5°F (0), gusts of 20 (0) and everything finished by 3 a.m. (minus 5): the score is 5, in the low band. Roads get cleared, buses roll, and the main risk to the school day is disappointment.
Reading your results
Read the itemised points before the band: they show which factor is doing the damage, and a score built on ice reads differently from the same score built on snow, because ice also threatens power and trees. Read the district line as tolerance, not weather: rural districts close on scores city districts shrug at, because route length and road type, not toughness, set the threshold. And read the bands as planning triggers (bags packed, alarms set, backup care on standby) rather than bets.
Limitations
- No district decision data, no odds. This bears repeating as the central limitation: closure probability requires a validated model of a specific district’s behaviour, which this page does not have and does not fake.
- Districts weigh things no forecast shows. Building conditions, staffing, bus fleet state, neighbouring districts’ calls and days already used all enter the real decision and none of them enter a weather score.
- Forecasts move. A score computed on Sunday evening prices Sunday evening’s forecast; the 4 a.m. update is the one the decision actually uses, and re-scoring takes seconds.
- The scale is published judgement, not measurement. The point values reflect how heavily the cited factors feature in closure announcements generally; they are printed in full above precisely so they can be disagreed with intelligently.
Frequently asked questions
How much snow does it take to close school?
There is no national number, which is why this page scores severity instead of quoting one. Districts in snowy regions run buses through amounts that would close schools further south for a week, because equipment, practice and road treatment differ. Ice closes schools at far smaller amounts than snow everywhere, and extreme wind chill closes them with no precipitation at all in the coldest regions. Your district’s own past announcements are the only honest guide to its threshold, and the score here is best read against them.
Why will this page not give me a percentage chance?
Because it would be fabricated. A defensible percentage needs years of one district’s decisions matched to the forecasts that preceded them, tested for calibration. Sites that offer a number without that are dressing a guess as data. The severity score is the transparent alternative: every point is accounted for in the model above, and the interpretation is labelled as context from the first line to the last.
What actually decides a closure on the morning?
Typically an early road check by district and transport staff, the latest forecast, whether buses can run routes safely and on time, whether buildings have power, heat and water, and whether students who walk or wait at stops can do so safely in the wind chill. Announcements usually land through the district’s own alert system, website and local media, which is where the answer lives; this page’s job ends at helping you read the weather those people are looking at.
Does a delay change the score?
A two-hour delay is the district buying the two things the timing row prices: daylight and ploughing time. Weather scoring in the moderate band with a bad timing line is the classic delay profile: not severe enough to cancel, too dangerous at 6 a.m. to run. If your district delays often, the timing input is the one to set most carefully, because it is the lever delays exist to move.
Related calculators
Method: transparent severity scoring of the factors districts cite in closure announcements (snow, ice, wind chill, gusts, timing), printed in full on the page; no closure probability is computed or implied. Last reviewed: 15 October 2026.