Port Austin, Michigan climate: Normal weather by month, frost dates and records
Port Austin's normal year runs from 15°F February nights to 78°F July afternoons, with 32.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.7°C, February lows of −9°C, July highs of 26°C, 824 mm of precipitation a year.
- NOAA stationPort Austin Wastewater Treatment Plant
- Station IDUSC00206662
- Location44.05°N 82.97°W
- Elevation605 ft (184 m)
- Population654
On October 14, the normal high in Port Austin is 59°F and the normal low 43°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Port Austin.
- Jan 29° 17°
- Feb 30° 15°
- Mar 38° 23°
- Apr 51° 33°
- May 64° 44°
- Jun 73° 54°
- Jul 78° 60°
- Aug 77° 59°
- Sep 71° 52°
- Oct 58° 42°
- Nov 45° 32°
- Dec 35° 23°
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 Port Austin each month?
July is the warmest month, with normal highs of 78°F; February the coldest, with normal lows of 15°F. The most precipitation falls in August (3.43 in), the least in February (1.63 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 29°F | 17°F | 22.9°F | 1.82 | – | <1 | 29 | 9 h 10 min |
| February | 30°F | 15°F | 22.7°F | 1.63 | – | <1 | 27 | 10 h 30 min |
| March | 38°F | 23°F | 30.6°F | 1.85 | – | <1 | 26 | 11 h 50 min |
| April | 51°F | 33°F | 41.9°F | 3.33 | – | <1 | 14 | 13 h 20 min |
| May | 64°F | 44°F | 53.9°F | 3.09 | – | <1 | 1 | 14 h 40 min |
| June | 73°F | 54°F | 63.7°F | 3.41 | – | 1 | <1 | 15 h 30 min |
| July | 78°F | 60°F | 68.9°F | 3.29 | – | 2 | <1 | 15 h 10 min |
| August | 77°F | 59°F | 67.7°F | 3.43 | – | 1 | <1 | 14 h |
| September | 71°F | 52°F | 61.0°F | 3.11 | – | <1 | <1 | 12 h 40 min |
| October | 58°F | 42°F | 50.1°F | 3.02 | – | <1 | 3 | 11 h 10 min |
| November | 45°F | 32°F | 38.8°F | 2.39 | – | <1 | 17 | 9 h 40 min |
| December | 35°F | 23°F | 29.0°F | 2.07 | – | <1 | 28 | 8 h 50 min |
| Year (annual) | 54°F | 38°F | 45.9°F | 32.44 | – | 4 | 145 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −2°C | −8°C | −5.1°C | 46 mm |
| February | −1°C | −9°C | −5.2°C | 41 mm |
| March | 3°C | −5°C | −0.8°C | 47 mm |
| April | 10°C | 0°C | 5.5°C | 85 mm |
| May | 18°C | 7°C | 12.2°C | 78 mm |
| June | 23°C | 12°C | 17.6°C | 87 mm |
| July | 26°C | 15°C | 20.5°C | 84 mm |
| August | 25°C | 15°C | 19.8°C | 87 mm |
| September | 21°C | 11°C | 16.1°C | 79 mm |
| October | 15°C | 6°C | 10.1°C | 77 mm |
| November | 7°C | 0°C | 3.8°C | 61 mm |
| December | 2°C | −5°C | −1.7°C | 53 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Harbor Beach (22 miles away), gets 47 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00206662; 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 Port Austin?
Normal highs sit between 65°F and 85°F in June, July, August and September.
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 USC00206662.
When is the last frost in Port Austin?
In Port Austin, the last spring frost (32°F) comes after May 4 in half of years and after May 19 in one year in ten; the first autumn frost comes before October 26 in half of years and before October 7 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 41 year in 10 after May 19; 9 in 10 after April 20
- First autumn frost, half of years before
- October 261 year in 10 before October 7; 9 in 10 before November 8
NOAA puts the median frost-free season at 172 days, and the season without a hard freeze (28°F) at 197 days.
A hard freeze (28°F) comes after April 21 in half of springs and before November 7 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Port Austin in zone 6a in ZIP code 48467, the nearest ZIP area.
Frost dates for every NOAA station in Michigan · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00206662; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Port Austin?
In a normal year in Port Austin, 4 days a year reach 90°F and 145 nights fall to 32°F or colder.
- Days at 90°F or more
- 4a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 145a normal year
- Days that stay below freezing
- 62high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00206662.
How sunny is Port Austin?
Over a year 69% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Port Austin, 3.6 kWh per square metre a day. July is the sunniest month (79%) and December the cloudiest (43%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 45% | 1.1 |
| February | 53% | 1.9 |
| March | 64% | 3.4 |
| April | 69% | 4.7 |
| May | 71% | 5.5 |
| June | 76% | 6.1 |
| July | 79% | 6.1 |
| August | 78% | 5.2 |
| September | 75% | 4.0 |
| October | 63% | 2.4 |
| November | 54% | 1.4 |
| December | 43% | 0.9 |
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 Port Austin need?
A normal year in Port Austin brings 7,314 heating degree days, 36% more than the median U.S. place (5,373), and 404 cooling degree days, 55% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,214 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,305 | 0 |
| February | 1,184 | 0 |
| March | 1,067 | 0 |
| April | 695 | 0 |
| May | 362 | 18 |
| June | 116 | 77 |
| July | 27 | 149 |
| August | 33 | 116 |
| September | 159 | 39 |
| October | 466 | 6 |
| November | 786 | 0 |
| December | 1,116 | 0 |
| Year (annual) | 7,314 | 404 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00206662. 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.
How does Port Austin's climate compare?
Port Austin is warmer than 55 of the other 139 places with their own NOAA record in Michigan, and wetter than 30. Across the 7,247 U.S. stations with normals, its annual mean of 45.9°F is warmer than 23%.
In the Köppen classification computed from these normals, Port Austin is Dfb: continental, no dry season, 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.
Questions about Port Austin's climate
What is the coldest month in Port Austin?
February, with a normal high of 30°F and a normal low of 15°F. The warmest is July (78°F by day, 60°F at night).
Does it snow in Port Austin?
Yes. NOAA publishes no 1991-2020 snowfall normal for Port Austin's NOAA station; the nearest record that keeps one, Harbor Beach (22 miles away), records 47 inches of snow in a normal year.
What is the rainiest month in Port Austin?
August, with 3.43 in of precipitation in a normal year; the driest is February with 1.63 in.
What plant hardiness zone is Port Austin in?
The USDA's 2023 map puts Port Austin in zone 6a in ZIP code 48467, the nearest ZIP area.
How late can frost come in Port Austin?
In half of years the last 32°F night comes after May 4; in one year in ten it comes after May 19. Waiting until May 19 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Michigan climateThe statewide normals and every place in the state
- Port Hope, MI9 miles from this station, 47.1°F a year
- Filion (5 mi NNW), MI11 miles from this station, 45.3°F a year
- Bad Axe, MI17 miles from this station, 46.4°F a year
- Harbor Beach, MI22 miles from this station, 45.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made