Harlem’s biggest natural hazard is inland flooding
Most of the natural-hazard damage FEMA expects in Harlem comes from inland flooding, and overall the risk is high for a U.S. community. Flood insurance has paid 488 claims here since 1978.
What stands out about Harlem’s weather risks
Read from FEMA’s records below. The page puts what stands out first.
Does Harlem flood? Yes: 488 flood claims since 1978
Every paid claim on a federal flood insurance policy in Harlem, from FEMA’s records.
- The Mid-spring storms12 claims · $168K
- The Midwest Flooding9 claims · $30K
Harlem isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Winnebago County.The storms Harlem remembers
None of the disasters declared for Winnebago County shows FEMA aid or repair money reaching Harlem itself in FEMA’s records.
- 201965 flood claims paidOne of the three biggest flood years on record
- 2008218 flood claims paidThe most in any one year on record
- 197835 flood claims paidOne of the three biggest flood years on record
Winnebago County has had 17 natural disasters declared since 1953, most often winter storms and floods.
Old photos of Harlem after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Harlem archive →How exposed is Harlem?
FEMA expects yearly storm and flood damage to homes and buildings here to be higher than in 66% of U.S. communities, mostly from inland flooding and cold waves.
Rated higher than 2,004 of the 2,886 Illinois towns we cover.
Harlem covers 10 census tracts, combined by population.
What Harlem faces
Each hazard’s share of the damage FEMA expects here, and how it compares with the rest of the country.
Inland flooding
Cold waves
Tornadoes
Get ready for what Harlem actually faces
A short kit for its top hazards, what to check before you buy, and where neighbors get alerts.
- Turn around at flooded roads: a foot of moving water can carry off a car.
- Flood insurance usually takes 30 days to start, so buy it before the forecast.
- Keep papers and medicines up high, in a grab-and-go bag.
- Let faucets drip so pipes don’t freeze.
- Know where your water shutoff is.
- Never heat the house with the oven or a grill.
- Pick your spot now: the lowest floor, an inside room, no windows.
- A watch means be ready; a warning means take cover now.
- Keep shoes and a flashlight by the bed.
- Look up the address on FEMA’s flood map.
- Ask the seller or landlord whether it has ever flooded, and what flood insurance costs there.
- Get a flood insurance quote early: policies usually start 30 days after you buy.
Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.
Harlem and its neighbors
Harlem ranks 7th calmest of 9 towns around it. Tap a town to see its hazards.
| Town | Rating | Mostly | Flood claims |
|---|---|---|---|
| Machesney Park | High | inland flooding | 378 |
| Harlem | High | inland flooding | 488 |
| Owen | High | inland flooding | 70 |
| Roscoe | Moderate | inland flooding | 108 |
| Rockford | Moderate | inland flooding | 562 |
| Rockford | Moderate | inland flooding | 658 |
| Loves Park | Moderate | inland flooding | 70 |
| Roscoe | Moderate | inland flooding | 39 |
| Caledonia | Low | inland flooding | 1 |
Rating = expected yearly storm and flood damage as a share of what’s there, vs. U.S. communities. Flood claims = paid federal flood insurance claims on record.
Most disasters here begin in June–August
The month each of Winnebago County’s 17 declared disasters began, since 1953.
What these numbers can and can’t tell you
- An average, not a forecast. FEMA’s National Risk Index estimates the damage 18 kinds of natural hazards cause in a typical year, from decades of records and models. A quiet decade can follow a bad year.
- Compared by rate. “Higher than N%” compares yearly damage as a share of what’s there, so a big city isn’t rated riskier just for having more buildings.
- Money that reached town. Flood claims are matched to Harlem’s own flood-insurance community (here, the census tracts inside it); household aid to the registrant’s city; repair grants to the Township of Harlem.
- It follows property value. FEMA’s model weighs damage to buildings, so a place that recently lost many homes can rate lower than it feels. Across Harlem, expected losses total about $19.2M a year, counting buildings, people and crops.
Storm stories
Memories, warnings and help from neighbors in Harlem.
Your answer becomes a post in Town Square.
Sources: FEMA National Risk Index (December 2025); OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Census tracts: U.S. Census Bureau. Preparedness tips: Ready.gov. An average of past damage, not a forecast.