Historical hail archive: January 2016–December 2025. NOAA radar estimates within 25 miles of each city centre. ZIP matches use the first three digits; this is not a property-level report or a live alert service. Coverage and source.
Weld County · Colorado · NOAA radar record 2016–2025
Hail damage in Greeley, CO
Radar has detected hail over Greeley on 347 separate days since 2016. On 119 of them the largest stone was estimated at golf-ball size or bigger. The biggest was 10.2 cm on June 17, 2025.
A very high value in this historical exposure model. This is not a national percentile or a diagnosis of your roof; the component values explain the result.
How we got to that number
| Component | Value | Weight | Contribution |
|---|---|---|---|
| Frequency Hail days per year at 1.00 in (2.5 cm) or larger | 66 / 100 | × 0.35 | 23.1 |
| Severity Largest stone radar estimated in the whole window | 100 / 100 | × 0.30 | 30.0 |
| Recency How long since the last 2 in (5 cm) day | 91 / 100 | × 0.20 | 18.2 |
| Concentration Hail days per year reaching golf-ball size | 60 / 100 | × 0.15 | 8.9 |
| RoofTake Score | 80 | ||
The score describes an area, not a house. Two roofs on the same street of different ages face very different risk from the identical storm. The whole formula and its weights are on the methodology page, and you can recompute it yourself from our public data.
Weld County is squarely inside the Colorado hail maximum.
Check your own ZIP code Is your roof damaged?
Data last refreshed: · source: NOAA NCEI Severe Weather Data Inventory, dataset nx3hail
The ten biggest hail days in Greeley since 2016
| Date | Radar max size | Metric | Comparison | Signatures |
|---|---|---|---|---|
| June 19, 2018 | 4.00 in | 10.2 cm | Grapefruit | 687 |
| July 30, 2018 | 4.00 in | 10.2 cm | Grapefruit | 66 |
| May 26, 2019 | 4.00 in | 10.2 cm | Grapefruit | 154 |
| August 20, 2019 | 4.00 in | 10.2 cm | Grapefruit | 97 |
| July 28, 2022 | 4.00 in | 10.2 cm | Grapefruit | 90 |
| June 17, 2025 | 4.00 in | 10.2 cm | Grapefruit | 318 |
| July 18, 2016 | 3.75 in | 9.5 cm | Teacup | 195 |
| June 17, 2019 | 3.75 in | 9.5 cm | Teacup | 72 |
| July 27, 2022 | 3.75 in | 9.5 cm | Teacup | 16 |
| July 27, 2016 | 3.50 in | 8.9 cm | Teacup | 39 |
"Signatures" is the number of separate radar volume scans that detected hail in a storm cell within 25 miles that day. More signatures means a longer-lived or larger storm, not necessarily bigger stones.
Hail days by year
Busiest year in the record: 2023 with 49 hail days.
Hail days by month
Peak month: July. Hail season in Colorado is short and it is not distributed evenly — most of the annual risk arrives in a few weeks.
What to do with this if you own a roof in Greeley
- Find your dates. Look up your ZIP for the record nearest you, and note every day at 1.00 in or above since you bought the house.
- Work out whether your roof could have survived them. A twelve-year-old asphalt roof and a two-year-old one respond very differently to the same stone — the age calculator explains why.
- Look, before you file. Nine photographs, none of them requiring you to get on the roof.
- Check the arithmetic. If the actual cash value of the damage is under your deductible, filing pays nothing — work it out first.
- Then write. The letter generator puts the Greeley radar record and the NOAA citation into your notice of claim.
Every hail day radar recorded near Greeley
347 days, most recent first. Sizes are radar estimates of the largest stone aloft in the cell, not measurements at any address.
- September 29, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- September 16, 20251.25 in (3.2 cm) — Half dollar size, radar-estimated
- August 30, 20250.75 in (1.9 cm) — Penny size, radar-estimated
- August 27, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- August 18, 20251.25 in (3.2 cm) — Half dollar size, radar-estimated
- August 14, 20250.50 in (1.3 cm) — Marble size, radar-estimated
- August 11, 20251.75 in (4.4 cm) — Golf ball size, radar-estimated
- August 10, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- August 1, 20251.25 in (3.2 cm) — Half dollar size, radar-estimated
- July 31, 20253.00 in (7.6 cm) — Teacup size, radar-estimated
- July 26, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- July 24, 20252.50 in (6.3 cm) — Tennis ball size, radar-estimated
- July 23, 20252.00 in (5.1 cm) — Hen egg size, radar-estimated
- July 18, 20250.75 in (1.9 cm) — Penny size, radar-estimated
- July 17, 20251.75 in (4.4 cm) — Golf ball size, radar-estimated
- July 16, 20251.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
- July 14, 20251.25 in (3.2 cm) — Half dollar size, radar-estimated
- July 12, 20252.50 in (6.3 cm) — Tennis ball size, radar-estimated
- July 11, 20252.00 in (5.1 cm) — Hen egg size, radar-estimated
- July 10, 20253.50 in (8.9 cm) — Teacup size, radar-estimated
- July 8, 20252.25 in (5.7 cm) — Hen egg size, radar-estimated
- July 7, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- July 6, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- July 5, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- July 4, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- June 29, 20253.00 in (7.6 cm) — Teacup size, radar-estimated
- June 26, 20251.25 in (3.2 cm) — Half dollar size, radar-estimated
- June 25, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- June 23, 20252.25 in (5.7 cm) — Hen egg size, radar-estimated
- June 17, 20254.00 in (10.2 cm) — Grapefruit size, radar-estimated
- June 16, 20252.25 in (5.7 cm) — Hen egg size, radar-estimated
- June 15, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- June 12, 20250.75 in (1.9 cm) — Penny size, radar-estimated
- June 11, 20250.50 in (1.3 cm) — Marble size, radar-estimated
- June 5, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- June 1, 20251.25 in (3.2 cm) — Half dollar size, radar-estimated
- May 30, 20251.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
- May 27, 20251.25 in (3.2 cm) — Half dollar size, radar-estimated
- May 26, 20251.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
- May 18, 20251.25 in (3.2 cm) — Half dollar size, radar-estimated
- May 4, 20250.50 in (1.3 cm) — Marble size, radar-estimated
- April 24, 20252.50 in (6.3 cm) — Tennis ball size, radar-estimated
- March 3, 20250.50 in (1.3 cm) — Marble size, radar-estimated
- September 15, 20242.25 in (5.7 cm) — Hen egg size, radar-estimated
- September 12, 20241.00 in (2.5 cm) — Quarter size, radar-estimated
- September 11, 20241.00 in (2.5 cm) — Quarter size, radar-estimated
- September 8, 20241.25 in (3.2 cm) — Half dollar size, radar-estimated
- August 14, 20240.75 in (1.9 cm) — Penny size, radar-estimated
- August 13, 20242.25 in (5.7 cm) — Hen egg size, radar-estimated
- August 7, 20243.25 in (8.3 cm) — Teacup size, radar-estimated
- July 28, 20241.25 in (3.2 cm) — Half dollar size, radar-estimated
- July 27, 20241.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
- July 22, 20241.25 in (3.2 cm) — Half dollar size, radar-estimated
- July 21, 20243.00 in (7.6 cm) — Teacup size, radar-estimated
- July 20, 20240.50 in (1.3 cm) — Marble size, radar-estimated
- July 19, 20240.75 in (1.9 cm) — Penny size, radar-estimated
- July 17, 20240.50 in (1.3 cm) — Marble size, radar-estimated
- July 14, 20240.50 in (1.3 cm) — Marble size, radar-estimated
- July 7, 20241.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
- June 20, 20241.75 in (4.4 cm) — Golf ball size, radar-estimated
Showing the 60 most recent of 347. The full record is in the JSON we publish: greeley-co.json.
From people in Greeley
The part of this page that no dataset can produce. Everything here is read by a human before it appears.
Neighbourhood reports
Claim outcomes
Damage photos from Greeley storms
Hail in Greeley, CO: common questions
How often does Greeley get damaging hail?
Radar recorded 347 hail days within 25 miles of the city centre between 2016 and 2025 — an average of 34.7 a year, of which 11.9 a year were at golf-ball size or larger. Not every one of those damages roofs.
When is hail season in Greeley?
The busiest month in this record is July, and 2023 was the busiest single year with 49 hail days.
Does this mean my roof is damaged?
No. These are radar estimates of the largest stone aloft in a storm cell somewhere within 25 miles of the city centre. Whether anything landed on your street, and whether it damaged your particular roof, needs somebody to look.
How do I use this for an insurance claim?
A specific date with a public, citable source is what turns 'sometime last year' into a date of loss. Use the claim letter generator, which pulls the date and the NOAA citation in for you.
Why 25 miles?
It is wide enough to catch storms that clipped the metro and narrow enough that the number still means something for a house inside it. The same radius is used for every metro so the pages are comparable.
Get quotes from roofers who work in Greeley
We pass your details to licensed contractors in our partner network who cover Weld County. Nothing is booked and nothing is charged here.