Hershey, Pennsylvania, 3,153 students in 5 schools

Derry Township School District Snow Day Predictor

Q: How much snow does Hershey get?

About 22.4 inches a winter at a NOAA weather station 9 miles away, averaged over 10 winters. Between December 1 and March 31 that brings 2.4 weekday mornings a year with 2 inches of new snow or more, and 0.7 with 4 inches or more.

Q: What was the biggest snow day near Derry Township?

14.7 inches on March 14, 2017, the largest single day at a NOAA weather station 9 miles away in 10 winters. The snowiest winter was 2018 to 2019, with 40.9 inches.

Q: How does the Derry Township snow day predictor work?

It reads the National Weather Service forecast for Hershey through the night and the 5 to 8 am bus run, adds winter alerts and the Winter Storm Severity Index, and measures the snow against Derry Township’s own big snow morning: 3.9 inches, the top tenth of snowy weekday mornings at a NOAA weather station 9 miles away.

Q: Can Pennsylvania schools hold a remote day instead?

A district with a PDE accepted plan can turn up to five closure days a year, including snow days, into Flexible Instructional Days that count as school days; they can be online, offline or both.

The odds of a closing or a delay on the next three school mornings in Derry Township, measured against Derry Township's own big snow morning of 3.9 inches.

The next three school mornings

Will Derry Township close tomorrow?

Reading the National Weather Service forecast for the overnight and the bus hours in Hershey.

Ten winters of school mornings

Derry Township’s snow record

22.4inches of snow a winter

2.4school mornings a winter with 2 in of new snow or more

0.7with 4 in or more

3.9 ina big snow morning in Derry Township: the top tenth of snowy school mornings

0.5school mornings a winter at 0 F or colder

0.9Nov

2.9Dec

7.4Jan

5.8Feb

5Mar

Average snowfall by month, inches

Biggest day 14.7 in on March 14, 2017
Snowiest winter 2018 to 2019, 40.9 in
6 in mornings 0.5 a winter
1 in mornings 3.3 a winter

Measured at a NOAA weather station 9 miles away. Mornings are the 7 am snow reading on a weekday from December 1 through March 31, over the ten winters from 2016 to 2017 through 2025 to 2026, from NOAA GHCN Daily.

The Pennsylvania rule

How Pennsylvania counts a lost day

Pennsylvania requires either 180 days, or hours: 900 for kindergarten through grade 6 and 990 for grades 7 to 12, as the district chooses. The state forgives no days; districts are expected to build make-up days into the calendar for closures beyond any Flexible Instructional Days.

The Pennsylvania rules in the agency’s own words, and every Pennsylvania district

Next door

Districts near Derry Township

District	Snow a winter	4 in mornings
Lower Dauphin School DistrictHummelstown	22.4 in	0.7
Palmyra Area School DistrictPalmyra	21.5 in	0.9
Middletown Area School DistrictMiddletown	22.4 in	0.7
Annville-Cleona School DistrictAnnville	21.5 in	0.9
Central Dauphin School DistrictHarrisburg	23.8 in	1.2
Elizabethtown Area School DistrictElizabethtown	25 in	1.6

The schools

5 schools

Every school in Derry Township follows the district’s call: one closing covers them all.

High

Hershey HS

Middle

Hershey MS

Elementary

Hershey Intrmd El Sch
Hershey Primary El Sch

Other schools

Hershey Early Childhood Ctr

Questions

Derry Township snow day questions

How much snow does Hershey get?

What was the biggest snow day near Derry Township?

How does the Derry Township snow day predictor work?

How does Pennsylvania handle snow days?

Can Pennsylvania schools hold a remote day instead?

More winter

More for Pennsylvania snow days

Snow day predictorClosing and delay odds for any ZIP, with the snowiest districts in the country.Snow depth mapHow much snow is on the ground right now, measured, across the country.First snow datesWhen the first measurable snow usually lands where you live.Frozen pipesThe nights cold enough to freeze a pipe, and what to do before one.Snow plow trackerWhere the plows are during a storm, city by city.Pennsylvania winter forecastThe season ahead for Pennsylvania: snowfall, cold and the first snow.

A residential street under deep snow on a bright blue morning, cars parked along the curb buried into smooth white mounds, one set of tire tracks down the middle — The morning after a big one: cars buried to the mirrors and one set of tracks down the middle. A street like this is a closing, no debate. Photo, Fairfax, Virginia, January 2016: Jarek Tuszyński, CC BY 4.0

The odds are a forecast read, and the superintendent makes the call: the district’s own announcement is the one to follow.