Port Huron, Michigan climate: Normal weather by month, frost dates and records
Port Huron's normal year runs from 20°F January nights to 81°F July afternoons, with 34.9 inches of precipitation and 36 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.7°C, January lows of −7°C, July highs of 27°C, 886 mm of precipitation a year.
- NOAA stationPort Huron
- Station IDUSC00206680
- Location42.98°N 82.42°W
- Elevation590 ft (180 m)
- From the center1 miles
- Population28,342
On October 23, the normal high in Port Huron is 57°F and the normal low 44°F, and the chance of measurable rain or snow is 40%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Port Huron.
- Jan 31° 20°
- Feb 33° 21°
- Mar 42° 28°
- Apr 54° 38°
- May 67° 49°
- Jun 76° 59°
- Jul 81° 65°
- Aug 80° 64°
- Sep 73° 57°
- Oct 61° 46°
- Nov 47° 35°
- Dec 36° 26°
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 Huron each month?
July is the warmest month, with normal highs of 81°F; January the coldest, with normal lows of 20°F. The most precipitation falls in June (3.62 in), the least in February (2.06 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 | 31°F | 20°F | 25.4°F | 2.48 | 11.1 | 14 | <1 | 28 | 9 h 20 min |
| February | 33°F | 21°F | 26.9°F | 2.06 | 11.4 | 10 | <1 | 26 | 10 h 30 min |
| March | 42°F | 28°F | 35.2°F | 2.21 | 4.6 | 11 | <1 | 23 | 11 h 50 min |
| April | 54°F | 38°F | 46.1°F | 3.15 | 0.4 | 13 | <1 | 8 | 13 h 20 min |
| May | 67°F | 49°F | 57.7°F | 3.53 | 0.0 | 13 | <1 | <1 | 14 h 40 min |
| June | 76°F | 59°F | 67.6°F | 3.62 | 0.0 | 11 | 3 | <1 | 15 h 20 min |
| July | 81°F | 65°F | 73.3°F | 3.25 | 0.0 | 10 | 4 | <1 | 15 h |
| August | 80°F | 64°F | 71.8°F | 3.14 | 0.0 | 10 | 2 | <1 | 14 h |
| September | 73°F | 57°F | 65.0°F | 3.32 | 0.0 | 10 | 1 | <1 | 12 h 30 min |
| October | 61°F | 46°F | 53.2°F | 3.13 | 0.0 | 13 | <1 | 1 | 11 h 10 min |
| November | 47°F | 35°F | 41.0°F | 2.81 | 1.3 | 12 | <1 | 13 | 9 h 50 min |
| December | 36°F | 26°F | 31.2°F | 2.17 | 6.7 | 13 | <1 | 24 | 9 h |
| Year (annual) | 57°F | 42°F | 49.5°F | 34.87 | 35.5 | 140 | 10 | 122 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −1°C | −7°C | −3.7°C | 63 mm | 28 cm |
| February | 1°C | −6°C | −2.8°C | 52 mm | 29 cm |
| March | 6°C | −2°C | 1.8°C | 56 mm | 12 cm |
| April | 12°C | 3°C | 7.8°C | 80 mm | 1 cm |
| May | 19°C | 9°C | 14.3°C | 90 mm | 0 cm |
| June | 25°C | 15°C | 19.8°C | 92 mm | 0 cm |
| July | 27°C | 18°C | 22.9°C | 83 mm | 0 cm |
| August | 27°C | 18°C | 22.1°C | 80 mm | 0 cm |
| September | 23°C | 14°C | 18.3°C | 84 mm | 0 cm |
| October | 16°C | 8°C | 11.8°C | 80 mm | 0 cm |
| November | 8°C | 2°C | 5.0°C | 71 mm | 3 cm |
| December | 2°C | −3°C | −0.4°C | 55 mm | 17 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00206680; 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 Huron?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, July has the fewest days with rain (10).
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 USC00206680.
When is the last frost in Port Huron?
In Port Huron, the last spring frost (32°F) comes after April 19 in half of years and after May 4 in one year in ten; the first autumn frost comes before November 3 in half of years and before October 20 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
- April 191 year in 10 after May 4; 9 in 10 after April 7
- First autumn frost, half of years before
- November 31 year in 10 before October 20; 9 in 10 before November 16
NOAA puts the median frost-free season at 196 days, and the season without a hard freeze (28°F) at 219 days.
A hard freeze (28°F) comes after April 7 in half of springs and before November 12 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Port Huron in zone 6b in ZIP code 48060. By the map's own method, the average of each year's coldest night over 1991-2020, Port Huron's NOAA station is in zone 6b: the coldest night of a typical year reaches −2°F (23 complete years).
Frost dates for every NOAA station in Michigan · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00206680; 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 Port Huron?
In a normal year in Port Huron, 10 days a year reach 90°F, 122 nights fall to 32°F or colder and 140 days bring measurable precipitation.
- Days at 90°F or more
- 10a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 122a normal year
- Days that stay below freezing
- 47high of 32°F or less
- Days with 0.01 inch of precipitation
- 140a normal year
- Days with 1 inch of snow or more
- 12a normal year
The highest temperature in this station's record (since 1931) is 102°F, on June 25, 1988; the lowest is −19°F, on January 19, 1994.
The wettest calendar year on that record is 1950, with 45.82 in; the snowiest season is 1964–65, with 84.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00206680; records: ACIS (NOAA Regional Climate Centers), station USC00206680. Records use complete months only; a month missing more than three days is left out.
How sunny is Port Huron?
Over a year 71% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Port Huron, 3.8 kWh per square metre a day. July is the sunniest month (80%) and January the cloudiest (52%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 52% | 1.4 |
| February | 58% | 2.3 |
| March | 64% | 3.4 |
| April | 69% | 4.7 |
| May | 71% | 5.5 |
| June | 77% | 6.3 |
| July | 80% | 6.2 |
| August | 79% | 5.4 |
| September | 77% | 4.3 |
| October | 68% | 2.8 |
| November | 62% | 1.8 |
| December | 55% | 1.3 |
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 Huron need?
A normal year in Port Huron brings 6,343 heating degree days, 18% more than the median U.S. place (5,373), and 749 cooling degree days, 17% 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 2,898 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,227 | 0 |
| February | 1,067 | 0 |
| March | 922 | 0 |
| April | 569 | 2 |
| May | 260 | 35 |
| June | 56 | 134 |
| July | 5 | 261 |
| August | 8 | 220 |
| September | 89 | 88 |
| October | 374 | 10 |
| November | 719 | 0 |
| December | 1,048 | 0 |
| Year (annual) | 6,343 | 749 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00206680. 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 Port Huron been warmer than normal lately?
2025 averaged 48.5°F, 1.0°F below the 1991-2020 normal of 49.5°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 52.1°F | +2.6°F | 33.47 | 14.5 |
| 2022 | 50.4°F | +0.9°F | 23.42 | 13.5 |
| 2023 | 51.6°F | +2.1°F | 39.82 | 20.9 |
| 2024 | 52.7°F | +3.2°F | 34.84 | 14.8 |
| 2025 | 48.5°F | −1.0°F | 30.13 | 31.0 |
Over 68 complete years from 1934 to 2025, the station's annual mean temperature rose at a fitted 3.9°F per century (+0.22°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00206680; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Port Huron's climate compare?
Port Huron is warmer than 130 of the other 139 places with their own NOAA record in Michigan, and wetter than 78. 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, Port Huron 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 Port Huron share this climate record?
4 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.
- Marysville, MI9,868 people · 6 mi SW
- St. Clair, MI5,824 people · 11 mi S
- Lakeport, MI746 people · 10 mi N
- Ruby, MI705 people · 11 mi W
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 Port Huron's climate
What is the coldest month in Port Huron?
January, with a normal high of 31°F and a normal low of 20°F. The warmest is July (81°F by day, 65°F at night).
Does it snow in Port Huron?
Yes: 36 inches in a normal year, falling on 22 days with 0.1 inch or more, the most in February (11.4 inches).
What is the rainiest month in Port Huron?
June, with 3.62 in of precipitation in a normal year; the driest is February with 2.06 in.
What plant hardiness zone is Port Huron in?
The USDA's 2023 map puts Port Huron in zone 6b in ZIP code 48060. By the same method at Port Huron's NOAA station, the coldest night of a typical year reaches −2°F (23 years, 1991-2020): zone 6b.
How late can frost come in Port Huron?
In half of years the last 32°F night comes after April 19; in one year in ten it comes after May 4. Waiting until May 4 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Port Huron in OctoberThis month day by day, its records and recent years
- Michigan climateThe statewide normals and every place in the state
- Richmond, MI20 miles from this station, 48.1°F a year
- Lexington, MI21 miles from this station, 46.5°F a year
- Yale, MI22 miles from this station, 45.4°F a year
- Algonac, MI25 miles from this station, 48.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made