Algonac, Michigan climate: Normal weather by month, frost dates and records
Algonac's normal year runs from 16°F January nights to 85°F July afternoons, with 34.6 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.3°C, January lows of −9°C, July highs of 29°C, 879 mm of precipitation a year.
- NOAA stationAlgonac Wastewater Treatment Plant
- Station IDUSC00200106
- Location42.62°N 82.54°W
- Elevation580 ft (177 m)
- Population4,111
On October 14, the normal high in Algonac is 65°F and the normal low 42°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Algonac.
- Jan 33° 16°
- Feb 35° 16°
- Mar 45° 24°
- Apr 58° 34°
- May 70° 45°
- Jun 80° 54°
- Jul 85° 60°
- Aug 83° 59°
- Sep 76° 51°
- Oct 63° 41°
- Nov 49° 31°
- Dec 38° 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 Algonac each month?
July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 16°F. The most precipitation falls in May (3.61 in), the least in February (2.06 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 33°F | 16°F | 24.7°F | 2.42 | – | <1 | 29 | 9 h 20 min |
| February | 35°F | 16°F | 25.6°F | 2.06 | – | <1 | 26 | 10 h 30 min |
| March | 45°F | 24°F | 34.2°F | 2.16 | – | <1 | 26 | 11 h 50 min |
| April | 58°F | 34°F | 45.9°F | 3.24 | – | <1 | 11 | 13 h 20 min |
| May | 70°F | 45°F | 57.5°F | 3.61 | – | 1 | 1 | 14 h 40 min |
| June | 80°F | 54°F | 66.9°F | 3.36 | – | 3 | <1 | 15 h 20 min |
| July | 85°F | 60°F | 72.6°F | 3.40 | – | 8 | <1 | 15 h |
| August | 83°F | 59°F | 70.7°F | 3.24 | – | 4 | <1 | 14 h |
| September | 76°F | 51°F | 63.7°F | 3.30 | – | 1 | <1 | 12 h 30 min |
| October | 63°F | 41°F | 52.3°F | 2.84 | – | <1 | 2 | 11 h 10 min |
| November | 49°F | 31°F | 39.7°F | 2.74 | – | <1 | 15 | 9 h 50 min |
| December | 38°F | 23°F | 30.6°F | 2.25 | – | <1 | 27 | 9 h |
| Year (annual) | 60°F | 38°F | 48.7°F | 34.62 | – | 17 | 137 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 1°C | −9°C | −4.1°C | 61 mm |
| February | 2°C | −9°C | −3.6°C | 52 mm |
| March | 7°C | −5°C | 1.2°C | 55 mm |
| April | 14°C | 1°C | 7.7°C | 82 mm |
| May | 21°C | 7°C | 14.2°C | 92 mm |
| June | 27°C | 12°C | 19.4°C | 85 mm |
| July | 29°C | 16°C | 22.6°C | 86 mm |
| August | 28°C | 15°C | 21.5°C | 82 mm |
| September | 24°C | 11°C | 17.6°C | 84 mm |
| October | 17°C | 5°C | 11.3°C | 72 mm |
| November | 9°C | −1°C | 4.3°C | 70 mm |
| December | 3°C | −5°C | −0.8°C | 57 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Mount Clemens (14 miles away), gets 32 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00200106; 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 Algonac?
Normal highs sit between 65°F and 85°F in May, 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 USC00200106.
When is the last frost in Algonac?
In Algonac, the last spring frost (32°F) comes after May 3 in half of years and after May 23 in one year in ten; the first autumn frost comes before October 18 in half of years and before October 4 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 31 year in 10 after May 23; 9 in 10 after April 20
- First autumn frost, half of years before
- October 181 year in 10 before October 4; 9 in 10 before November 1
NOAA puts the median frost-free season at 167 days, and the season without a hard freeze (28°F) at 189 days.
A hard freeze (28°F) comes after April 22 in half of springs and before October 31 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Algonac in zone 6b in ZIP code 48001, 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 USC00200106; 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 Algonac?
In a normal year in Algonac, 17 days a year reach 90°F and 137 nights fall to 32°F or colder.
- Days at 90°F or more
- 17a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 137a normal year
- Days that stay below freezing
- 39high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00200106.
How sunny is Algonac?
Over a year 71% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Algonac, 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 Algonac need?
A normal year in Algonac brings 6,551 heating degree days, 22% more than the median U.S. place (5,373), and 643 cooling degree days, 29% 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 2,736 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,251 | 0 |
| February | 1,103 | 0 |
| March | 957 | 1 |
| April | 573 | 0 |
| May | 256 | 25 |
| June | 58 | 115 |
| July | 7 | 241 |
| August | 15 | 190 |
| September | 103 | 64 |
| October | 402 | 8 |
| November | 759 | 0 |
| December | 1,068 | 0 |
| Year (annual) | 6,551 | 643 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00200106. 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 Algonac been warmer than normal lately?
2025 averaged 49.1°F, 0.4°F above the 1991-2020 normal of 48.7°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 50.9°F | +2.2°F | 40.46 |
| 2022 | 49.4°F | +0.7°F | 25.99 |
| 2023 | 50.9°F | +2.2°F | 38.95 |
| 2024 | 52.4°F | +3.7°F | 43.28 |
| 2025 | 49.1°F | +0.4°F | 28.56 |
Source: observed years: ACIS, station USC00200106. A year counts only with all twelve months complete.
How does Algonac's climate compare?
Algonac is warmer than 118 of the other 139 places with their own NOAA record in Michigan, and wetter than 74. Across the 7,247 U.S. stations with normals, its annual mean of 48.7°F is warmer than 35%.
In the Köppen classification computed from these normals, Algonac 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 Algonac share this climate record?
2 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.
- Pearl Beach, MI4,846 people · 2 mi NW
- Marine City, MI4,006 people · 7 mi N
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 Algonac's climate
What is the coldest month in Algonac?
January, with a normal high of 33°F and a normal low of 16°F. The warmest is July (85°F by day, 60°F at night).
Does it snow in Algonac?
Yes. NOAA publishes no 1991-2020 snowfall normal for Algonac's NOAA station; the nearest record that keeps one, Mount Clemens (14 miles away), records 32 inches of snow in a normal year.
What is the rainiest month in Algonac?
May, with 3.61 in of precipitation in a normal year; the driest is February with 2.06 in.
What plant hardiness zone is Algonac in?
The USDA's 2023 map puts Algonac in zone 6b in ZIP code 48001, the nearest ZIP area.
How late can frost come in Algonac?
In half of years the last 32°F night comes after May 3; in one year in ten it comes after May 23. Waiting until May 23 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Michigan climateThe statewide normals and every place in the state
- Mount Clemens, MI14 miles from this station, 48.7°F a year
- Richmond, MI22 miles from this station, 48.1°F a year
- Grosse Pointe Farms, MI23 miles from this station, 48.5°F a year
- Port Huron, MI25 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