Construction weather days in Detroit, MI
On average, how many days each month had 0.10 inch of rain or more, a low below 32°F, or a high above 95°F in Detroit, MI, from official NOAA station records for 2021 to 2025.
Average days per month, 2021 to 2025
| Month | Rain, 0.10 in or more | Low below 32°F | High above 95°F |
|---|---|---|---|
| January | 6.0 | 28.0 | 0.0 |
| February | 4.6 | 26.4 | 0.0 |
| March | 6.6 | 23.4 | 0.0 |
| April | 8.0 | 11.4 | 0.0 |
| May | 7.2 | 0.4 | 0.0 |
| June | 7.6 | 0.0 | 0.6 |
| July | 8.6 | 0.0 | 0.0 |
| August | 6.8 | 0.0 | 0.0 |
| September | 4.2 | 0.0 | 0.0 |
| October | 6.6 | 2.2 | 0.0 |
| November | 5.8 | 17.6 | 0.0 |
| December | 6.8 | 24.8 | 0.0 |
| Days per year | 78.8 | 134.2 | 0.6 |
These are averages of past years, not a forecast, and a day can meet more than one of the three columns. The last row adds up the months.
How to read the table
- Rain. Days with 0.10 inch or more of precipitation. A trace counts as zero.
- Low. Days when the lowest temperature was below 32°F.
- High. Days when the highest temperature was above 95°F.
- Each figure is the average, over the 5 years, of that month’s count. A day the station did not report is not counted and is not estimated.
- These are plain weather counts. They do not say which days count under a contract. Your contract sets its own thresholds and method, so use your numbers in the calculator below.
Weather station
- Station
- FARMINGTON (USC00202691)
- Distance
- 14.5 miles from the center of Detroit, so conditions at a jobsite can differ
- Days reported
- In every month from January 2021 through December 2025, at least 93% of days had a rain, high and low reading (99.9% over the whole period)
- Source
- NOAA Regional Climate Centers ACIS, daily station records from GHCN-Daily, retrieved October 2, 2026
The station is the nearest one within 30 miles of the city center that met the 90% rule. To look at the records yourself, see GHCN-Daily and NOAA Online Weather Data.
WeatheredOut is documentation software. It is not legal, engineering or scheduling advice, expert testimony, or a determination of contractual entitlement. Verify results against your contract and official records.