Winter service in Chicago

The city that everyone assumes is a snowbelt

Chicago has a reputation for brutal winters, and the reputation is earned — but not for the reason most people assume. The city averages about 38.4 inches of snow a year at O’Hare on the 1991–2020 normals. That is a solid figure. It is also, almost exactly, what Rockford gets: 37.1 inches, ninety miles inland, with no lake anywhere near it. Both numbers sit on the same National Weather Service page, and the comparison is the fastest way to understand a Chicago winter.

The lake is right there, so why isn’t it making snow? Because of which end of it the city sits on. Chicago is at the south-western tip of Lake Michigan, and the prevailing winter winds are westerly and north-westerly — which means the air arrives over the city having crossed land, and only reaches open water on its way out. The Illinois State Climatologist states it without hedging: Chicago “does not experience as much lake-effect snow as areas on the downwind lake coast, like western Michigan.” The snow that a lake-effect setup would produce falls on the Michigan shore instead. Only when the flow swings round to the north or north-east does the mechanism turn towards Chicago, and that is the exception.

What the lake does do here is moderate temperature — cooler summers, slightly milder winters near the water, layered on top of an urban heat island worth roughly two degrees Fahrenheit. So the honest framing for winter service in Chicago is that this is a city with a snowbelt’s reputation and a plains city’s snowfall, and its real winter problem lies elsewhere.

Where the difficulty actually is: flat, vast, and frozen solid

Start with the ground. Chicago sits on the Chicago Plain, the bed of glacial Lake Chicago, and it has, in the words of the geographic description, “very little topographical relief.” The average height of land is 579 feet; the highest natural point inside the city limits, in Beverly, is 672 feet. The whole city spans about thirty metres of elevation. The only ridges worth the name are old sandbars — Clark Street and Ridge Boulevard trace them on the North Side. There are no hills to prioritise, and equally no slope to carry meltwater away.

Then the cold, which is where Chicago’s numbers get serious. On the same normals: 43.4 days a year never rise above 32 °F, 121.3 days a year reach freezing or below, and 6.5 days a year fall to 0 °F (−17.8 °C) or lower, with a mean January low of 18.8 °F. Six weeks of days that never thaw is a different operational picture from a snowier city with milder afternoons. What melts refreezes, salt loses efficiency as the pavement temperature drops, and the same crossing gets treated repeatedly through a single cold spell.

And then scale. The Department of Streets and Sanitation is responsible for more than 9,400 lane miles, divided into six Snow Districts. There is no clever terrain-based triage available. There is only surface, and a lot of it.

What the local rules say

Chicago’s sidewalk duty sits in the Municipal Code of Chicago, Section 10-8-180 — Snow and ice removal. It is unusually specific, and worth reading in the ordinance itself rather than in summary, because most of what circulates online is out of date.

Every owner, lessee, tenant, occupant or other person in charge of a building or lot abutting a public way is responsible for removing snow and ice from the abutting sidewalk and the sidewalk ramps intersecting it, “creating a clear path of at least 5 feet in width.” The timing is set to the clock rather than to a countdown: snow falling between 7 a.m. and 7 p.m. must be removed “no later than ten p.m. of the same day”; snow falling overnight between 7 p.m. and 7 a.m. must be gone “no later than ten a.m. of the same day.” There is no Sunday exemption in the current text — a number of advice pages still describe the older three-hour rule, and those should be ignored.

Two further provisions matter in practice. Where ice is frozen too hard to remove without damaging the pavement, subsection (a)(3) requires sand or abrasive material to be strewn within the same time window, and the walk cleaned properly once the weather permits — so a hard freeze does not suspend the duty, it changes what discharges it. And subsection (a)(4) addresses parking lots: owners of multiple dwelling unit buildings and townhouse developments with surface parking lots may not push that snow onto the public way, and where there is nowhere on site to store it, “such owner shall contract for private snow and ice removal.”

The penalty is “not less than $50.00 nor more than $500.00 for each offense,” and each day the condition continues is a distinct and separate offence. Figures of $500 for homes and $1,000 for businesses circulate widely; they are not in the section. The code also carries an exemption from that penalty for residential property inside an active pilot area under the Chicago Plow the Sidewalks Pilot Program — a scheme the city has debated for years, with a working group reporting in 2024 and funding argued over since. The exemption is in the text; whether any pilot area is active is a separate question worth checking locally.

Directly after the duty comes its counterpart, 10-8-190, which is easy to miss. Anyone who removes snow or ice from a public sidewalk or street “shall not, as a result of his acts or omissions in such removal, be liable for civil damages,” except where they violate Section 8-4-120 or where the conduct amounts to wilful or wanton misconduct. That is what the section says. How it lands in any real dispute is a question for a lawyer — none of this is legal advice.

Two parking bans, constantly confused

Chicago runs two winter parking prohibitions, and mixing them up is the most common local mistake.

The Winter Overnight Parking Ban is a calendar rule. It covers 107 miles of arterial streets, 3 a.m. to 7 a.m., from 1 December to 1 April — and the City is explicit that it is enforced “regardless of snow.” A clear, dry night in December changes nothing; those streets are permanently signed. Getting it wrong is expensive: a minimum $150 towing fee, a $60 ticket, and $25 per day of storage.

The snow route ban is a trigger rule. On another 500 miles of main streets, parking can be prohibited once there are at least two inches of snow on the street, “no matter the time of day or the calendar date.” That last clause is the part people miss — it reaches outside the December-to-April window entirely.

How the city clears

Road work is coordinated from Snow Command, which draws on a network of cameras and pavement sensors, radar, and GPS on every truck to deploy crews across up to over 280 snow routes, main and arterial streets first, residential streets after. The narrowest side streets are handled by a fleet of over 20 smaller plows, including 4x4 pick-ups. For a major storm the City can equip as many as 200 garbage trucks with “quick hitch” plows — and because those have no salt-spreading capability, they are run in tandem with trucks that do.

The expressways are not the City’s at all: they belong to IDOT, which is why the orange trucks look different from the City’s. During an event, the City publishes its fleet’s live positions through the Plow Tracker on the Chicago Shovels hub — which means “was my street done?” is a question with an answer rather than an argument.

Uncleared sidewalks are a different channel again: those go to 311, under “Snow – Uncleared Sidewalk or Bike Lane” — expressly not the route for streets, alleys or parking lots. The volumes are real: the Chicago Sun-Times reported that between 1 November and 10 December 2025 the City logged over 12,000 snow-related 311 requests, about half of them about uncleared sidewalks — more than four times the previous high for that window since 2019.

Dibs, and the line it draws

After a heavy snowfall, dug-out kerbside spaces across the city sprout chairs, cones and ironing boards. “Dibs” is Chicago’s best-known winter custom, and it has never been legalised — Streets and Sanitation announces collection sweeps once the thaw arrives, running the normal refuse routes with an eye on 311 complaints, and tells residents to retrieve anything they want back.

It is worth mentioning here not as folklore but because of what it reveals. Chicago allocates winter work property by property: the City takes the roadway, the abutting owner takes the sidewalk in front of it, to a five-foot width, by ten o’clock. Dibs is what happens when residents apply that same logic to the parking space they personally cleared. Understand the division of labour and the custom stops being strange.

Cross a line and the rulebook changes

Chicago’s ordinance stops at the city limits, and Greater Chicago’s suburbs diverge in both directions. Evanston asks for a 36-inch path within 24 hours of the end of snowfall — narrower than Chicago, far more time. Naperville allows 48 hours after an event exceeding two inches. Skokie inverts the model altogether and plows its sidewalks itself once four inches have fallen, with alleys at six. Schaumburg requires nothing of residents at all, while still forbidding snow pushed into the roadway.

For anyone running routes across the metropolitan area, that is four different standards inside an hour’s drive — different widths, different clocks, and in Skokie’s case a different party doing the work. The band of weather overhead does not notice any of it.

The storms people still measure winters against

Three events anchor the local memory. 26–27 January 1967 remains the largest single storm on record at 23.0 inches, with gusts of 48–53 mph at Midway piling drifts across the city and leaving roughly 50,000 abandoned cars and 800 CTA buses where they stopped. January 1979 brought 20.3 inches onto an already deep snowpack, and the clearing operation went on to dominate that year’s mayoral primary — Michael Bilandic lost it to Jane Byrne, which is the bluntest illustration available that snow clearance in Chicago is a political subject. In the Groundhog Day Blizzard of 2011, 21.2 inches at O’Hare and 60–70 mph gusts stranded around 700 people on Lake Shore Drive, which stayed shut for 33 hours.

Keeping the record straight

In a city where the duty is written to the hour and split property by property, the useful thing is being able to show plainly what was done and when. Not to win an argument — but because deadlines of 10 p.m. and 10 a.m., a five-foot width, and a freeze that holds for six weeks at a stretch generate exactly the questions a vague answer cannot settle. A simple, time-stamped record of each treatment, set against what the weather was actually doing, turns “we were out all night” into something specific, and a note of what was spread and where does the same for a long cold spell. That is the documentation support Wintertrace is built to make easy — a clear log of where a crew went and when — whether you look after one property or a set of routes that crosses from the city into Evanston, Skokie and Oak Park in a single shift. It changes no local rule; it just means that when someone asks what happened before ten o’clock, the answer is on file. Not a substitute for legal advice.