Dearborn, Michigan climate: Normal weather by month, frost dates and records
Dearborn's normal year runs from 18°F January nights to 84°F July afternoons, with 35.0 inches of precipitation and 31 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.7°C, January lows of −8°C, July highs of 29°C, 890 mm of precipitation a year.
- NOAA stationDearborn
- Station IDUSC00202015
- Location42.32°N 83.24°W
- Elevation605 ft (184 m)
- From the center1 miles
- Population106,377
On October 23, the normal high in Dearborn is 59°F and the normal low 39°F, and the chance of measurable rain or snow is 37%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Dearborn.
- Jan 32° 18°
- Feb 35° 19°
- Mar 45° 26°
- Apr 58° 37°
- May 70° 48°
- Jun 79° 58°
- Jul 84° 62°
- Aug 82° 61°
- Sep 75° 53°
- Oct 62° 42°
- Nov 48° 32°
- Dec 37° 24°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Dearborn each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 18°F. The most precipitation falls in May (3.60 in), the least in February (2.27 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 32°F | 18°F | 24.8°F | 2.51 | 11.7 | 12 | <1 | 29 | 9 h 20 min |
| February | 35°F | 19°F | 27.0°F | 2.27 | 7.3 | 9 | <1 | 26 | 10 h 30 min |
| March | 45°F | 26°F | 35.8°F | 2.29 | 5.7 | 9 | <1 | 24 | 11 h 50 min |
| April | 58°F | 37°F | 47.6°F | 3.26 | 0.6 | 12 | <1 | 10 | 13 h 20 min |
| May | 70°F | 48°F | 58.8°F | 3.60 | 0.0 | 12 | 1 | 1 | 14 h 30 min |
| June | 79°F | 58°F | 68.5°F | 3.28 | 0.0 | 10 | 4 | <1 | 15 h 20 min |
| July | 84°F | 62°F | 72.8°F | 3.54 | 0.0 | 10 | 7 | <1 | 15 h |
| August | 82°F | 61°F | 71.3°F | 3.23 | 0.0 | 10 | 4 | <1 | 14 h |
| September | 75°F | 53°F | 64.3°F | 3.01 | 0.0 | 9 | 2 | <1 | 12 h 30 min |
| October | 62°F | 42°F | 51.9°F | 2.87 | 0.0 | 12 | <1 | 5 | 11 h 10 min |
| November | 48°F | 32°F | 40.3°F | 2.74 | 0.9 | 10 | <1 | 16 | 9 h 50 min |
| December | 37°F | 24°F | 30.5°F | 2.45 | 4.6 | 12 | <1 | 25 | 9 h 10 min |
| Year (annual) | 59°F | 40°F | 49.5°F | 35.05 | 30.8 | 127 | 16 | 136 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −8°C | −4.0°C | 64 mm | 30 cm |
| February | 2°C | −7°C | −2.8°C | 58 mm | 19 cm |
| March | 7°C | −3°C | 2.1°C | 58 mm | 14 cm |
| April | 15°C | 3°C | 8.7°C | 83 mm | 2 cm |
| May | 21°C | 9°C | 14.9°C | 91 mm | 0 cm |
| June | 26°C | 14°C | 20.3°C | 83 mm | 0 cm |
| July | 29°C | 17°C | 22.7°C | 90 mm | 0 cm |
| August | 28°C | 16°C | 21.8°C | 82 mm | 0 cm |
| September | 24°C | 12°C | 17.9°C | 76 mm | 0 cm |
| October | 17°C | 5°C | 11.1°C | 73 mm | 0 cm |
| November | 9°C | 0°C | 4.6°C | 70 mm | 2 cm |
| December | 3°C | −4°C | −0.8°C | 62 mm | 12 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00202015; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Dearborn?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September has the fewest days with rain (9).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00202015.
When is the last frost in Dearborn?
In Dearborn, the last spring frost (32°F) comes after May 1 in half of years and after May 18 in one year in ten; the first autumn frost comes before October 15 in half of years and before October 1 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 11 year in 10 after May 18; 9 in 10 after April 17
- First autumn frost, half of years before
- October 151 year in 10 before October 1; 9 in 10 before October 28
NOAA puts the median frost-free season at 166 days, and the season without a hard freeze (28°F) at 190 days.
A hard freeze (28°F) comes after April 20 in half of springs and before October 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Dearborn in zone 6b across its 4 ZIP code areas (6b in 48124, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Dearborn's NOAA station is in zone 6a: the coldest night of a typical year reaches −6°F (19 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Michigan · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00202015; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
What hardiness zone is each Dearborn ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Dearborn's 4 ZIP code areas are all in zone 6b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Dearborn?
In a normal year in Dearborn, 16 days a year reach 90°F, 136 nights fall to 32°F or colder and 127 days bring measurable precipitation.
- Days at 90°F or more
- 16a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 136a normal year
- Days that stay below freezing
- 38high of 32°F or less
- Days with 0.01 inch of precipitation
- 127a normal year
- Days with 1 inch of snow or more
- 12a normal year
The highest temperature in this station's record (since 1952) is 104°F, on June 26, 1988; the lowest is −20°F, on January 19, 1994.
The wettest calendar year on that record is 1990, with 45.79 in; the snowiest season is 1977–78, with 70.2 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00202015; records: ACIS (NOAA Regional Climate Centers), station USC00202015. Records use complete months only; a month missing more than three days is left out.
How sunny is Dearborn?
Over a year 71% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Dearborn, 3.8 kWh per square metre a day. July is the sunniest month (80%) and December the cloudiest (54%). Among the 459 U.S. places of 50,000 or more, that ranks tied 416th (with 11 others) in sunshine.
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 59% | 1.6 |
| February | 62% | 2.4 |
| March | 66% | 3.5 |
| April | 68% | 4.7 |
| May | 70% | 5.5 |
| June | 76% | 6.2 |
| July | 80% | 6.2 |
| August | 78% | 5.3 |
| September | 77% | 4.3 |
| October | 68% | 2.8 |
| November | 63% | 1.8 |
| December | 54% | 1.2 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Dearborn need?
A normal year in Dearborn brings 6,366 heating degree days, 18% more than the median U.S. place (5,373), and 736 cooling degree days, 19% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,901 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,244 | 0 |
| February | 1,064 | 0 |
| March | 906 | 1 |
| April | 525 | 3 |
| May | 233 | 39 |
| June | 43 | 147 |
| July | 6 | 247 |
| August | 11 | 206 |
| September | 106 | 84 |
| October | 416 | 8 |
| November | 741 | 0 |
| December | 1,071 | 0 |
| Year (annual) | 6,366 | 736 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00202015. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Dearborn been warmer than normal lately?
2025 averaged 50.4°F, 0.9°F above the 1991-2020 normal of 49.5°F. 2 of the 2 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2022 | 50.1°F | +0.6°F | 28.13 | 23.0 |
| 2025 | 50.4°F | +0.9°F | 24.55 | 24.1 |
Over 50 complete years from 1953 to 2025, the station's annual mean temperature rose at a fitted 3.0°F per century (+0.17°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00202015; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Dearborn's climate compare?
Dearborn is warmer than 130 of the other 139 places with their own NOAA record in Michigan, and wetter than 82. Across the 7,247 U.S. stations with normals, its annual mean of 49.5°F is warmer than 38%.
In the Köppen classification computed from these normals, Dearborn is Dfa: continental, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Dearborn share this climate record?
10 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Dearborn Heights, MIalso near: Detroit (8 mi, 50.6°F a year); Farmington (10 mi, 47.6°F a year)61,040 people · 3 mi NW
- Lincoln Park, MI38,774 people · 6 mi SE
- Allen Park, MI27,604 people · 4 mi S
- Garden City, MI26,410 people · 5 mi W
- Wyandotte, MI24,214 people · 9 mi SE
- Ferndale, MI19,431 people · 11 mi NE
- Melvindale, MI12,401 people · 4 mi SE
- Ecorse, MI8,938 people · 7 mi SE
- Highland Park, MI8,390 people · 9 mi NE
- River Rouge, MI6,877 people · 7 mi SE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Dearborn's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Dearborn. This page uses Dearborn; the other differs by site and elevation:
| Station | From the center | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Dearborn #2 USC00202016 | 3 mi NE | 605 ft | 50.3°F | 19°F | 84°F | 34.9 | – | April 27 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Dearborn's climate
What is the coldest month in Dearborn?
January, with a normal high of 32°F and a normal low of 18°F. The warmest is July (84°F by day, 62°F at night).
Does it snow in Dearborn?
Yes: 31 inches in a normal year, falling on 21 days with 0.1 inch or more, the most in January (11.7 inches).
What is the rainiest month in Dearborn?
May, with 3.60 in of precipitation in a normal year; the driest is February with 2.27 in.
What plant hardiness zone is Dearborn in?
The USDA's 2023 map puts Dearborn in zone 6b across its 4 ZIP code areas (6b in 48124, the largest). By the same method at Dearborn's NOAA station, the coldest night of a typical year reaches −6°F (19 years, 1991-2020): zone 6a.
How late can frost come in Dearborn?
In half of years the last 32°F night comes after May 1; in one year in ten it comes after May 18. Waiting until May 18 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Dearborn in OctoberThis month day by day, its records and recent years
- Michigan climateThe statewide normals and every place in the state
- Detroit, MI7 miles from this station, 50.6°F a year
- Farmington, MI12 miles from this station, 47.6°F a year
- Grosse Pointe Farms, MI19 miles from this station, 48.5°F a year
- Carleton, MI21 miles from this station, 49.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made