Detroit, Oregon climate: Normal weather by month, frost dates and records
Detroit's normal year runs from 36°F January nights to 81°F August afternoons, with 93.6 inches of precipitation and 10 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.4°C, January lows of 2°C, August highs of 27°C, 2,376 mm of precipitation a year.
- NOAA stationDetroit Dam
- Station IDUSC00352292
- Location44.72°N 122.25°W
- Elevation1,220 ft (372 m)
- Population189
On October 14, the normal high in Detroit is 62°F and the normal low 47°F, and the chance of measurable rain or snow is 44%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Detroit.
- Jan 43° 36°
- Feb 47° 37°
- Mar 52° 38°
- Apr 57° 41°
- May 65° 46°
- Jun 71° 51°
- Jul 80° 56°
- Aug 81° 56°
- Sep 74° 53°
- Oct 61° 47°
- Nov 49° 40°
- Dec 43° 37°
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 Detroit each month?
August is the warmest month, with normal highs of 81°F; January the coldest, with normal lows of 36°F. The most precipitation falls in December (15.44 in), the least in July (0.68 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 43°F | 36°F | 39.9°F | 13.06 | 5.6 | 20 | <1 | 12 | 9 h 10 min |
| February | 47°F | 37°F | 41.7°F | 10.00 | 2.2 | 18 | <1 | 10 | 10 h 20 min |
| March | 52°F | 38°F | 44.8°F | 10.71 | 0.9 | 21 | <1 | 7 | 11 h 50 min |
| April | 57°F | 41°F | 49.2°F | 8.63 | 0.0 | 20 | <1 | 3 | 13 h 30 min |
| May | 65°F | 46°F | 55.8°F | 6.02 | 0.0 | 16 | <1 | <1 | 14 h 50 min |
| June | 71°F | 51°F | 61.0°F | 3.84 | 0.0 | 11 | 1 | <1 | 15 h 30 min |
| July | 80°F | 56°F | 68.0°F | 0.68 | 0.0 | 4 | 5 | <1 | 15 h 20 min |
| August | 81°F | 56°F | 68.5°F | 0.92 | 0.0 | 4 | 5 | <1 | 14 h 10 min |
| September | 74°F | 53°F | 63.4°F | 2.81 | 0.0 | 7 | 1 | <1 | 12 h 40 min |
| October | 61°F | 47°F | 53.6°F | 7.96 | 0.0 | 14 | <1 | <1 | 11 h |
| November | 49°F | 40°F | 44.9°F | 13.49 | 0.2 | 20 | <1 | 5 | 9 h 40 min |
| December | 43°F | 37°F | 39.9°F | 15.44 | 1.3 | 21 | <1 | 10 | 8 h 50 min |
| Year (annual) | 60°F | 45°F | 52.5°F | 93.56 | 10.2 | 176 | 13 | 46 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | 2°C | 4.4°C | 332 mm | 14 cm |
| February | 8°C | 3°C | 5.4°C | 254 mm | 6 cm |
| March | 11°C | 3°C | 7.1°C | 272 mm | 2 cm |
| April | 14°C | 5°C | 9.6°C | 219 mm | 0 cm |
| May | 18°C | 8°C | 13.2°C | 153 mm | 0 cm |
| June | 22°C | 11°C | 16.1°C | 98 mm | 0 cm |
| July | 27°C | 13°C | 20.0°C | 17 mm | 0 cm |
| August | 27°C | 13°C | 20.3°C | 23 mm | 0 cm |
| September | 23°C | 12°C | 17.4°C | 71 mm | 0 cm |
| October | 16°C | 8°C | 12.0°C | 202 mm | 0 cm |
| November | 10°C | 5°C | 7.2°C | 343 mm | 1 cm |
| December | 6°C | 3°C | 4.4°C | 392 mm | 3 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00352292; 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 Detroit?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, August has the fewest days with rain (4).
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 USC00352292.
When is the last frost in Detroit?
In Detroit, the last spring frost (32°F) comes after March 9 in half of years and after April 8 in one year in ten; the first autumn frost comes before December 3 in half of years and before November 8 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
- March 91 year in 10 after April 8; 9 in 10 after February 2
- First autumn frost, half of years before
- December 31 year in 10 before November 8; 9 in 10 before January 4
NOAA puts the median frost-free season at 270 days, and the season without a hard freeze (28°F) at 327 days.
A hard freeze (28°F) comes after February 5 in half of springs and before December 26 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Detroit in zone 7b in ZIP code 97350, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Detroit's NOAA station is in zone 9a: the coldest night of a typical year reaches 20°F (27 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 Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00352292; 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.
How hot and how cold does it get in Detroit?
In a normal year in Detroit, 13 days a year reach 90°F (1 of them 100°F or more), 46 nights fall to 32°F or colder and 176 days bring measurable precipitation.
- Days at 90°F or more
- 13a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 46a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 176a normal year
- Days with 1 inch of snow or more
- 3a normal year
The highest temperature in this station's record (since 1954) is 111°F, on June 29, 2021; the lowest is 7°F, on February 3, 1989.
The wettest calendar year on that record is 1996, with 138.61 in; the snowiest season is 1968–69, with 99.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00352292; records: ACIS (NOAA Regional Climate Centers), station USC00352292. Records use complete months only; a month missing more than three days is left out.
How sunny is Detroit?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Detroit, 3.9 kWh per square metre a day. July is the sunniest month (89%) and December the cloudiest (53%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 56% | 1.3 |
| February | 61% | 2.2 |
| March | 59% | 3.1 |
| April | 64% | 4.5 |
| May | 70% | 5.7 |
| June | 74% | 6.4 |
| July | 89% | 7.4 |
| August | 88% | 6.3 |
| September | 81% | 4.6 |
| October | 70% | 2.8 |
| November | 58% | 1.5 |
| December | 53% | 1.1 |
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 Detroit need?
A normal year in Detroit brings 4,896 heating degree days, 9% fewer than the median U.S. place (5,373), and 373 cooling degree days, 59% 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 2,304 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 780 | 0 |
| February | 652 | 0 |
| March | 626 | 0 |
| April | 475 | 1 |
| May | 298 | 11 |
| June | 157 | 35 |
| July | 36 | 128 |
| August | 30 | 139 |
| September | 103 | 57 |
| October | 356 | 3 |
| November | 603 | 0 |
| December | 780 | 0 |
| Year (annual) | 4,896 | 373 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00352292. 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 Detroit been warmer than normal lately?
2025 averaged 53.1°F, 0.6°F above the 1991-2020 normal of 52.5°F. 1 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 52.5°F | at normal | 84.14 | 39.4 |
| 2022 | 51.3°F | −1.2°F | 92.60 | 8.0 |
| 2023 | 51.9°F | −0.6°F | 71.74 | 21.1 |
| 2024 | 52.1°F | −0.4°F | 103.70 | – |
| 2025 | 53.1°F | +0.6°F | 82.71 | – |
Over 55 complete years from 1955 to 2025, the station's annual mean temperature rose at a fitted 2.0°F per century (+0.11°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00352292; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Detroit's climate compare?
Detroit is warmer than 58 of the other 104 places with their own NOAA record in Oregon, and wetter than 96. Across the 7,247 U.S. stations with normals, its annual mean of 52.5°F is warmer than 52%.
In the Köppen classification computed from these normals, Detroit is Csb: temperate, dry-summer, warm 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 Detroit share this climate record?
3 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.
- Mill City, OR2,128 people · 11 mi W
- Gates, OR487 people · 8 mi W
- Idanha, OR157 people · 9 mi E
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Detroit's climate
What is the coldest month in Detroit?
January, with a normal high of 43°F and a normal low of 36°F. The warmest is August (81°F by day, 56°F at night).
Does it snow in Detroit?
Yes: 10 inches in a normal year, falling on 5 days with 0.1 inch or more, the most in January (5.6 inches).
What is the rainiest month in Detroit?
December, with 15.44 in of precipitation in a normal year; the driest is July with 0.68 in.
What plant hardiness zone is Detroit in?
The USDA's 2023 map puts Detroit in zone 7b in ZIP code 97350, the nearest ZIP area. By the same method at Detroit's NOAA station, the coldest night of a typical year reaches 20°F (27 years, 1991-2020): zone 9a.
How late can frost come in Detroit?
In half of years the last 32°F night comes after March 9; in one year in ten it comes after April 8. Waiting until April 8 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Marion Forks Fish Hatchery, OR17 miles from this station, 47.1°F a year
- Scotts Mills, OR21 miles from this station, 48.7°F a year
- Silver Creek Falls, OR22 miles from this station, 48.8°F a year
- Lacomb, OR24 miles from this station, 51.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made