Blackduck, Minnesota climate: Normal weather by month, frost dates and records
Blackduck's normal year runs from −9°F January nights to 78°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 3.2°C, January lows of −23°C, July highs of 26°C.
- NOAA stationBlackduck
- Station IDUSC00210809
- Location47.67°N 94.52°W
- Elevation1,340 ft (408 m)
- Population816
On October 22, the normal high in Blackduck is 50°F and the normal low 28°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Blackduck.
- Jan 18° -9°
- Feb 24° -4°
- Mar 37° 10°
- Apr 52° 25°
- May 65° 38°
- Jun 74° 49°
- Jul 78° 54°
- Aug 77° 51°
- Sep 68° 42°
- Oct 53° 31°
- Nov 36° 16°
- Dec 23° 1°
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 Blackduck each month?
July is the warmest month, with normal highs of 78°F; January the coldest, with normal lows of −9°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 18°F | −9°F | 4.7°F | – | <1 | 31 | 8 h 50 min |
| February | 24°F | −4°F | 9.6°F | – | <1 | 28 | 10 h 10 min |
| March | 37°F | 10°F | 23.2°F | – | <1 | 29 | 11 h 50 min |
| April | 52°F | 25°F | 38.1°F | – | <1 | 23 | 13 h 30 min |
| May | 65°F | 38°F | 51.4°F | – | <1 | 6 | 15 h 10 min |
| June | 74°F | 49°F | 61.3°F | – | <1 | <1 | 16 h |
| July | 78°F | 54°F | 65.9°F | – | 1 | <1 | 15 h 40 min |
| August | 77°F | 51°F | 63.9°F | – | 1 | <1 | 14 h 20 min |
| September | 68°F | 42°F | 54.8°F | – | <1 | 3 | 12 h 40 min |
| October | 53°F | 31°F | 41.7°F | – | <1 | 17 | 11 h |
| November | 36°F | 16°F | 26.1°F | – | <1 | 28 | 9 h 20 min |
| December | 23°F | 1°F | 12.0°F | – | <1 | 31 | 8 h 30 min |
| Year (annual) | 50°F | 25°F | 37.7°F | – | 2 | 196 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | −8°C | −23°C | −15.2°C |
| February | −5°C | −20°C | −12.4°C |
| March | 3°C | −12°C | −4.9°C |
| April | 11°C | −4°C | 3.4°C |
| May | 18°C | 3°C | 10.8°C |
| June | 23°C | 9°C | 16.3°C |
| July | 26°C | 12°C | 18.8°C |
| August | 25°C | 11°C | 17.7°C |
| September | 20°C | 6°C | 12.7°C |
| October | 12°C | −1°C | 5.4°C |
| November | 2°C | −9°C | −3.3°C |
| December | −5°C | −17°C | −11.1°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Cass Lake (20 miles away), gets 49 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00210809; 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 Blackduck?
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 USC00210809.
When is the last frost in Blackduck?
In Blackduck, the last spring frost (32°F) comes after May 24 in half of years and after June 6 in one year in ten; the first autumn frost comes before September 17 in half of years and before September 1 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 241 year in 10 after June 6; 9 in 10 after May 9
- First autumn frost, half of years before
- September 171 year in 10 before September 1; 9 in 10 before October 1
NOAA puts the median frost-free season at 115 days, and the season without a hard freeze (28°F) at 137 days.
A hard freeze (28°F) comes after May 13 in half of springs and before September 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Blackduck in zone 3b in ZIP code 56630, the nearest ZIP area.
Frost dates for every NOAA station in Minnesota · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00210809; 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 Blackduck?
In a normal year in Blackduck, 2 days a year reach 90°F and 196 nights fall to 32°F or colder.
- Days at 90°F or more
- 2a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 196a normal year
- Days that stay below freezing
- 98high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00210809.
How sunny is Blackduck?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Blackduck, 3.7 kWh per square metre a day. February is the sunniest month (80%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 73% | 1.6 |
| February | 80% | 2.8 |
| March | 75% | 3.9 |
| April | 71% | 4.8 |
| May | 69% | 5.4 |
| June | 72% | 5.9 |
| July | 79% | 6.2 |
| August | 78% | 5.2 |
| September | 72% | 3.8 |
| October | 65% | 2.4 |
| November | 62% | 1.4 |
| December | 62% | 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 Blackduck need?
A normal year in Blackduck brings 10,094 heating degree days, 88% more than the median U.S. place (5,373), and 195 cooling degree days, 79% fewer than the median (908). Nine months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,635 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,871 | 0 |
| February | 1,551 | 0 |
| March | 1,296 | 0 |
| April | 806 | 0 |
| May | 429 | 7 |
| June | 144 | 33 |
| July | 59 | 87 |
| August | 93 | 57 |
| September | 315 | 10 |
| October | 723 | 0 |
| November | 1,166 | 0 |
| December | 1,643 | 0 |
| Year (annual) | 10,094 | 195 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00210809. 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 Blackduck's climate compare?
Blackduck is warmer than 8 of the other 128 places with their own NOAA record in Minnesota. Across the 7,247 U.S. stations with normals, its annual mean of 37.7°F is warmer than 3%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Blackduck 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.
- Tenstrike, MN180 people · 8 mi W
- Turtle River, MN82 people · 13 mi SW
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 Blackduck's climate
What is the coldest month in Blackduck?
January, with a normal high of 18°F and a normal low of −9°F. The warmest is July (78°F by day, 54°F at night).
Does it snow in Blackduck?
Yes. NOAA publishes no 1991-2020 snowfall normal for Blackduck's NOAA station; the nearest record that keeps one, Cass Lake (20 miles away), records 49 inches of snow in a normal year.
What plant hardiness zone is Blackduck in?
The USDA's 2023 map puts Blackduck in zone 3b in ZIP code 56630, the nearest ZIP area.
How late can frost come in Blackduck?
In half of years the last 32°F night comes after May 24; in one year in ten it comes after June 6. Waiting until June 6 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Minnesota climateThe statewide normals and every place in the state
- Northome, MN17 miles from this station, 38.2°F a year
- Cass Lake, MN21 miles from this station, 40.0°F a year
- Red Lake, MN27 miles from this station, 39.3°F a year
- Leech Lake, MN32 miles from this station, 40.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made