Amboy, Minnesota climate: Normal weather by month, frost dates and records
Amboy's normal year runs from 8°F January nights to 84°F July afternoons, with 32.8 inches of precipitation and 46 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.4°C, January lows of −13°C, July highs of 29°C, 832 mm of precipitation a year.
- NOAA stationAmboy
- Station IDUSC00210157
- Location43.88°N 94.17°W
- Elevation1,030 ft (314 m)
- From the centerunder 1 mile
- Population515
On October 22, the normal high in Amboy is 58°F and the normal low 37°F, and the chance of measurable rain or snow is 20%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Amboy.
- Jan 26° 8°
- Feb 30° 12°
- Mar 43° 24°
- Apr 59° 36°
- May 73° 49°
- Jun 82° 60°
- Jul 84° 63°
- Aug 82° 60°
- Sep 76° 52°
- Oct 62° 39°
- Nov 44° 26°
- Dec 30° 14°
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 Amboy each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 8°F. The most precipitation falls in June (5.26 in), the least in January (0.83 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 26°F | 8°F | 16.9°F | 0.83 | 10.4 | 5 | <1 | 31 | 9 h 10 min |
| February | 30°F | 12°F | 21.2°F | 0.87 | 8.9 | 5 | <1 | 27 | 10 h 30 min |
| March | 43°F | 24°F | 33.5°F | 1.67 | 7.4 | 7 | <1 | 25 | 11 h 50 min |
| April | 59°F | 36°F | 47.8°F | 3.30 | 3.5 | 9 | <1 | 11 | 13 h 20 min |
| May | 73°F | 49°F | 60.6°F | 4.27 | 0.1 | 11 | 2 | 1 | 14 h 40 min |
| June | 82°F | 60°F | 70.6°F | 5.26 | 0.0 | 11 | 5 | <1 | 15 h 30 min |
| July | 84°F | 63°F | 73.4°F | 4.15 | 0.0 | 8 | 6 | <1 | 15 h 10 min |
| August | 82°F | 60°F | 70.7°F | 3.93 | 0.0 | 8 | 2 | <1 | 14 h |
| September | 76°F | 52°F | 63.7°F | 3.34 | 0.0 | 7 | 2 | 1 | 12 h 40 min |
| October | 62°F | 39°F | 50.4°F | 2.56 | 0.4 | 7 | <1 | 9 | 11 h 10 min |
| November | 44°F | 26°F | 35.3°F | 1.47 | 4.8 | 5 | <1 | 22 | 9 h 40 min |
| December | 30°F | 14°F | 22.4°F | 1.12 | 10.8 | 7 | <1 | 30 | 9 h |
| Year (annual) | 58°F | 37°F | 47.2°F | 32.77 | 46.3 | 90 | 16 | 156 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −4°C | −13°C | −8.4°C | 21 mm | 26 cm |
| February | −1°C | −11°C | −6.0°C | 22 mm | 23 cm |
| March | 6°C | −4°C | 0.8°C | 42 mm | 19 cm |
| April | 15°C | 2°C | 8.8°C | 84 mm | 9 cm |
| May | 23°C | 9°C | 15.9°C | 108 mm | 0 cm |
| June | 28°C | 15°C | 21.4°C | 134 mm | 0 cm |
| July | 29°C | 17°C | 23.0°C | 105 mm | 0 cm |
| August | 28°C | 15°C | 21.5°C | 100 mm | 0 cm |
| September | 24°C | 11°C | 17.6°C | 85 mm | 0 cm |
| October | 16°C | 4°C | 10.2°C | 65 mm | 1 cm |
| November | 7°C | −3°C | 1.8°C | 37 mm | 12 cm |
| December | −1°C | −10°C | −5.3°C | 28 mm | 27 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00210157; 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 Amboy?
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 (7).
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 USC00210157.
When is the last frost in Amboy?
In Amboy, the last spring frost (32°F) comes after April 30 in half of years and after May 12 in one year in ten; the first autumn frost comes before October 7 in half of years and before September 23 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 301 year in 10 after May 12; 9 in 10 after April 14
- First autumn frost, half of years before
- October 71 year in 10 before September 23; 9 in 10 before October 22
NOAA puts the median frost-free season at 161 days, and the season without a hard freeze (28°F) at 182 days.
A hard freeze (28°F) comes after April 20 in half of springs and before October 20 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Amboy in zone 5a in ZIP code 56010, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Amboy's NOAA station is in zone 4b: the coldest night of a typical year reaches −20°F (23 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 Minnesota · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00210157; 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 Amboy?
In a normal year in Amboy, 16 days a year reach 90°F, 156 nights fall to 32°F or colder and 90 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
- 156a normal year
- Days that stay below freezing
- 66high of 32°F or less
- Days with 0.01 inch of precipitation
- 90a normal year
- Days with 1 inch of snow or more
- 15a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00210157.
How sunny is Amboy?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Amboy, 4.0 kWh per square metre a day. July is the sunniest month (83%) and December the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 71% | 1.9 |
| February | 77% | 3.0 |
| March | 71% | 3.8 |
| April | 69% | 4.8 |
| May | 70% | 5.5 |
| June | 75% | 6.2 |
| July | 83% | 6.5 |
| August | 80% | 5.5 |
| September | 78% | 4.3 |
| October | 72% | 2.9 |
| November | 70% | 2.0 |
| December | 66% | 1.5 |
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 Amboy need?
A normal year in Amboy brings 7,257 heating degree days, 35% more than the median U.S. place (5,373), and 812 cooling degree days, 11% 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 3,001 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,491 | 0 |
| February | 1,226 | 0 |
| March | 975 | 1 |
| April | 520 | 5 |
| May | 195 | 59 |
| June | 26 | 194 |
| July | 7 | 266 |
| August | 15 | 192 |
| September | 123 | 86 |
| October | 465 | 11 |
| November | 891 | 0 |
| December | 1,322 | 0 |
| Year (annual) | 7,257 | 812 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00210157. 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 Amboy's climate compare?
Amboy is warmer than 126 of the other 128 places with their own NOAA record in Minnesota, and wetter than 88. Across the 7,247 U.S. stations with normals, its annual mean of 47.2°F is warmer than 29%.
In the Köppen classification computed from these normals, Amboy 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 Amboy 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.
- Mapleton, MN1,639 people · 11 mi E
- Good Thunder, MN545 people · 10 mi NE
- Vernon Center, MN315 people · 5 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 Amboy's climate
What is the coldest month in Amboy?
January, with a normal high of 26°F and a normal low of 8°F. The warmest is July (84°F by day, 63°F at night).
Does it snow in Amboy?
Yes: 46 inches in a normal year, falling on 20 days with 0.1 inch or more, the most in December (10.8 inches).
What is the rainiest month in Amboy?
June, with 5.26 in of precipitation in a normal year; the driest is January with 0.83 in.
What plant hardiness zone is Amboy in?
The USDA's 2023 map puts Amboy in zone 5a in ZIP code 56010, the nearest ZIP area. By the same method at Amboy's NOAA station, the coldest night of a typical year reaches −20°F (23 years, 1991-2020): zone 4b.
How late can frost come in Amboy?
In half of years the last 32°F night comes after April 30; in one year in ten it comes after May 12. Waiting until May 12 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Minnesota climateThe statewide normals and every place in the state
- Winnebago, MN8 miles from this station, 45.6°F a year
- Mankato, MN20 miles from this station, 45.3°F a year
- Fairmont, MN22 miles from this station, 46.1°F a year
- St. James, MN24 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