Lewiston, Idaho, 4,563 students in 13 schools

Lewiston Independent School District 340 Snow Day Predictor

Q: How much snow does Lewiston get?

About 17.1 inches a winter at a NOAA weather station 2.2 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 0.8 with 4 inches or more.

Q: What was the biggest snow day near Lewiston?

7.2 inches on December 30, 2021, the largest single day at a NOAA weather station 2.2 miles away in 10 winters. The snowiest winter was 2016 to 2017, with 39.2 inches.

Q: How does the Lewiston snow day predictor work?

It reads the National Weather Service forecast for Lewiston 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 Lewiston’s own big snow morning: 3.8 inches, the top tenth of snowy weekday mornings at a NOAA weather station 2.2 miles away.

Q: How far ahead does the Lewiston snow day predictor look?

Three school mornings, as far as the National Weather Service hourly forecast reaches. Weekends and breaks are skipped, so a Friday storm is read for Monday’s buses.

The odds of a closing or a delay on the next three school mornings in Lewiston, measured against Lewiston's own big snow morning of 3.8 inches.

The next three school mornings

Will Lewiston close tomorrow?

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

Ten winters of school mornings

Lewiston’s snow record

17.1inches of snow a winter

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

0.8with 4 in or more

3.8 ina big snow morning in Lewiston: the top tenth of snowy school mornings

0.2school mornings a winter at 0 F or colder

0.8Nov

5.1Dec

3.2Jan

6.8Feb

1.1Mar

Average snowfall by month, inches

Biggest day 7.2 in on December 30, 2021
Snowiest winter 2016 to 2017, 39.2 in
6 in mornings 0.3 a winter
1 in mornings 4.4 a winter

Measured at a NOAA weather station 2.2 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 Idaho rule

How Idaho counts a lost day

Idaho requires at least 990 instructional hours for grades 9 to 12, 900 for grades 4 to 8, 810 for grades 1 to 3 and 450 for kindergarten. With local board approval, up to 11 hours of emergency closures for bad weather or facility failures can come off the yearly hours requirement.

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

Next door

Districts near Lewiston

District	Snow a winter	4 in mornings	Built in days
Coeur d'Alene School District 271Coeur D'alene	22.8 in	0.9	2
Post Falls School District 273Post Falls	22.8 in	0.9
Lakeland Joint School District 272Rathdrum	22.8 in	0.9
Lake Pend Oreille School District 84Ponderay	73.7 in	3.3
Middleton School District 134Middleton	14.8 in	0.4
Caldwell School District 132Caldwell	14.1 in	0.9

The schools

13 schools

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

High

Lewiston High School
Tammany High School
A Neil DeAtley Career Technical Education Center

Middle

Jenifer Middle School
Sacajawea Middle School

Elementary

Centennial Elementary School
Whitman Elementary School
Camelot Elementary School
McSorley Elementary School
Orchards Elementary School
McGhee Elementary School
Webster Elementary School

Other schools

Region 2 Juvenile Detention Center

Questions

Lewiston snow day questions

How much snow does Lewiston get?

What was the biggest snow day near Lewiston?

How does the Lewiston snow day predictor work?

How does Idaho handle snow days?

How far ahead does the Lewiston snow day predictor look?

More winter

More for Idaho 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.Idaho winter forecastThe season ahead for Idaho: 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.