Lake-effect snow in La Porte County
Why the lakeshore usually gets the most, why a single band can bury one town and skip the next, and what it means for La Porte, Michigan City and the dunes.
What lake-effect snow is
When cold air, often from Canada, moves over the open, relatively warm water of Lake Michigan, it picks up heat and moisture and drops it downwind as narrow, heavy bands of snow. The National Weather Service notes those bands can drop 2 to 3 inches an hour while the sun shines a mile or two away, and the wind direction decides who gets hit. That's why La Porte County can see a foot of snow in one town and almost none in the next.
It adds up. The University of Michigan's GLISA climate summary for the La Porte weather station, which uses NOAA data, puts La Porte's average at more than 60 inches of snow a year, nearly double what places at the same latitude in northern Illinois get, and about 3 inches more precipitation a year than areas the lake doesn't reach.
La Porte vs. Michigan City vs. the dunes
The lakeshore usually gets it first and worst. On Jan. 20, 2024, a lake-effect band dropped 2 to 3 inches an hour across La Porte County. The reports ABC7 Chicago compiled show the pattern:
| Place (Jan. 20, 2024) | Snow |
|---|---|
| Trail Creek | 36 inches |
| Michigan City | 35 inches |
| Pinola | 32 inches |
| Springville | 30.5 inches |
| La Porte | 28 inches |
| Waterford | 27 inches |
But the band, not the map, decides. On Jan. 14-15, 2026, a single band set up farther east. The Weather Service's report had the highest total of the whole event, 20 inches, at a volunteer CoCoRaHS station in eastern La Porte County, while a station just west of La Porte measured 3 inches and one near Wanatah measured 2. Multi-vehicle crashes were reported on the Indiana Toll Road.
The dunes sit on a forecast line. Indiana Dunes National Park runs along the lakeshore from Porter County into Michigan City, where Mount Baldy is. La Porte County's forecasts and warnings come from the Weather Service office for Northern Indiana in Syracuse, but Porter County's come from the Chicago office, so a lake-effect warning can stop at the county line even when the same band crosses it. When you're headed west along the lake, check the forecast for where you're going.
When it happens
Lake-effect snow needs cold air over a lake that's still warmer than the air, so it comes from late fall into winter. The heaviest bands come when cold air crosses a long stretch of open water before reaching land; winds blowing down the length of the lake give the longest trip. Watch the forecast for phrases like "lake-effect snow," "snow showers" with "locally heavy," or a Lake Effect Snow Warning.
Driving through it
The biggest danger is how fast it changes. The Weather Service's snow squall warnings cover brief bursts of heavy snow (up to 2 inches in 30 minutes) with 30+ mph wind and whiteouts under a quarter mile, and the most dangerous ones go to phones like tornado warnings. On Jan. 20, 2024, Indiana State Police urged drivers to stay off eastbound I-94 in La Porte County. Our Toll Road and I-94 guide covers what to do.
Questions
Why does Michigan City get more snow than La Porte?
Usually because it's closer to the lake: lake-effect bands often hit the shoreline first. On Jan. 20, 2024, Michigan City reported 35 inches and La Porte 28. But a band can also set up inland; on Jan. 14-15, 2026, eastern La Porte County got 20 inches while the lakeshore got far less.
How much snow does La Porte get a year?
More than 60 inches in an average year, according to the University of Michigan's GLISA summary of NOAA data for the La Porte station, nearly double what northern Illinois gets at the same latitude.
How fast can lake-effect snow fall?
The National Weather Service says lake-effect bands can drop 2 to 3 inches of snow an hour, and that's what happened in La Porte County on Jan. 20, 2024.
What is a snow squall warning?
A short-fused warning, like a tornado warning, for a brief burst of heavy snow with strong wind and whiteouts. The most dangerous ones alert your phone. If one is issued, delay travel or exit the road safely.
Where can I see snow totals for La Porte County?
Our snow totals page lists every Weather Service storm report for La Porte County, updated hourly during storms.
Sources: NWS: lake-effect snow · GLISA (University of Michigan): La Porte climate station, NOAA data · ABC7 Chicago: La Porte County snow totals, Jan. 20, 2024 · NWS Northern Indiana: Jan. 14-15, 2026 lake-effect snow · NWS: snow squall FAQ