Port Of Morgan, Montana climate: Climate normals at a NOAA weather station
Port Of Morgan's normal year runs from 4°F January nights to 83°F July afternoons, with 12.6 inches of precipitation and 23 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.3°C, January lows of −15°C, July highs of 28°C, 320 mm of precipitation a year.
- NOAA stationPort Of Morgan
- Station IDUSC00246672
- Location49.00°N 107.83°W
- Elevation2,830 ft (863 m)
On October 23, the normal high in Port Of Morgan is 52°F and the normal low 28°F, and the chance of measurable rain or snow is 15%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Port Of Morgan.
- Jan 23° 4°
- Feb 28° 8°
- Mar 40° 18°
- Apr 56° 30°
- May 67° 39°
- Jun 74° 48°
- Jul 83° 54°
- Aug 83° 52°
- Sep 72° 43°
- Oct 56° 31°
- Nov 38° 19°
- Dec 26° 8°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Port Of Morgan each month?
July is the warmest month, with normal highs of 83°F; January the coldest, with normal lows of 4°F. The most precipitation falls in June (3.01 in), the least in February (0.19 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 23°F | 4°F | 13.5°F | 0.46 | 3.5 | 4 | <1 | 31 | 8 h 40 min |
| February | 28°F | 8°F | 17.7°F | 0.19 | 3.0 | 4 | <1 | 27 | 10 h 10 min |
| March | 40°F | 18°F | 29.3°F | 0.25 | 4.6 | 3 | <1 | 28 | 11 h 50 min |
| April | 56°F | 30°F | 42.9°F | 0.90 | 1.4 | 5 | <1 | 18 | 13 h 40 min |
| May | 67°F | 39°F | 53.1°F | 1.83 | 0.6 | 9 | <1 | 7 | 15 h 10 min |
| June | 74°F | 48°F | 61.2°F | 3.01 | 0.0 | 12 | 1 | <1 | 16 h 10 min |
| July | 83°F | 54°F | 68.4°F | 1.82 | 0.0 | 7 | 7 | <1 | 15 h 50 min |
| August | 83°F | 52°F | 67.5°F | 1.29 | 0.0 | 6 | 7 | <1 | 14 h 30 min |
| September | 72°F | 43°F | 57.0°F | 1.28 | 0.3 | 6 | 1 | 3 | 12 h 40 min |
| October | 56°F | 31°F | 43.2°F | 0.77 | 1.8 | 5 | <1 | 18 | 10 h 50 min |
| November | 38°F | 19°F | 28.4°F | 0.44 | 3.6 | 4 | <1 | 27 | 9 h 10 min |
| December | 26°F | 8°F | 16.7°F | 0.37 | 4.1 | 4 | <1 | 31 | 8 h 20 min |
| Year (annual) | 54°F | 29°F | 41.6°F | 12.61 | 22.9 | 67 | 16 | 189 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −5°C | −15°C | −10.3°C | 12 mm | 9 cm |
| February | −2°C | −13°C | −7.9°C | 5 mm | 8 cm |
| March | 5°C | −8°C | −1.5°C | 6 mm | 12 cm |
| April | 13°C | −1°C | 6.1°C | 23 mm | 4 cm |
| May | 19°C | 4°C | 11.7°C | 46 mm | 2 cm |
| June | 23°C | 9°C | 16.2°C | 76 mm | 0 cm |
| July | 28°C | 12°C | 20.2°C | 46 mm | 0 cm |
| August | 28°C | 11°C | 19.7°C | 33 mm | 0 cm |
| September | 22°C | 6°C | 13.9°C | 33 mm | 1 cm |
| October | 13°C | −1°C | 6.2°C | 20 mm | 5 cm |
| November | 4°C | −7°C | −2.0°C | 11 mm | 9 cm |
| December | −3°C | −14°C | −8.5°C | 9 mm | 10 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00246672; 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.
Which months are mildest at Port Of Morgan?
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 (6).
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 USC00246672.
When is the last frost at Port Of Morgan?
In Port Of Morgan, the last spring frost (32°F) comes after May 19 in half of years and after June 2 in one year in ten; the first autumn frost comes before September 22 in half of years and before September 9 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 191 year in 10 after June 2; 9 in 10 after May 5
- First autumn frost, half of years before
- September 221 year in 10 before September 9; 9 in 10 before October 4
NOAA puts the median frost-free season at 124 days, and the season without a hard freeze (28°F) at 144 days.
A hard freeze (28°F) comes after May 8 in half of springs and before September 30 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Port Of Morgan in zone 3b in ZIP code 59537, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 4a: the coldest night of a typical year reaches −27°F (15 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 Montana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00246672; 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 at Port Of Morgan?
In a normal year in Port Of Morgan, 16 days a year reach 90°F, 189 nights fall to 32°F or colder and 67 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
- 189a normal year
- Days that stay below freezing
- 77high of 32°F or less
- Days with 0.01 inch of precipitation
- 67a normal year
- Days with 1 inch of snow or more
- 10a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00246672.
How sunny is it at Port Of Morgan?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds at Port Of Morgan, 4.0 kWh per square metre a day. July is the sunniest month (86%) and December the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 75% | 1.5 |
| February | 78% | 2.6 |
| March | 75% | 3.8 |
| April | 73% | 4.9 |
| May | 75% | 6.0 |
| June | 77% | 6.5 |
| July | 86% | 6.9 |
| August | 85% | 5.7 |
| September | 79% | 4.2 |
| October | 75% | 2.7 |
| November | 72% | 1.6 |
| December | 68% | 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 many heating and cooling degree days does Port Of Morgan record?
A normal year at Port Of Morgan brings 8,838 heating degree days, 64% more than the median U.S. place (5,373), and 339 cooling degree days, 63% 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 1,940 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,595 | 0 |
| February | 1,324 | 0 |
| March | 1,108 | 0 |
| April | 663 | 0 |
| May | 375 | 6 |
| June | 149 | 33 |
| July | 36 | 141 |
| August | 58 | 134 |
| September | 262 | 23 |
| October | 675 | 1 |
| November | 1,097 | 0 |
| December | 1,496 | 0 |
| Year (annual) | 8,838 | 339 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00246672. 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 Of Morgan's climate compare?
Port Of Morgan is warmer than 25 of the 141 places with their own NOAA record in Montana, and wetter than 25. Across the 7,247 U.S. stations with normals, its annual mean of 41.6°F is warmer than 9%.
In the Köppen classification computed from these normals, Port Of Morgan is BSk: cold semi-arid steppe. 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 Of Morgan 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.
- Whitewater, MT100 people · 19 mi SE
- Loring Colony, MT27 people · 16 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 Port Of Morgan's climate
What is the coldest month at Port Of Morgan?
January, with a normal high of 23°F and a normal low of 4°F. The warmest is July (83°F by day, 54°F at night).
Does it snow at Port Of Morgan?
Yes: 23 inches in a normal year, falling on 16 days with 0.1 inch or more, the most in March (4.6 inches).
What is the rainiest month at Port Of Morgan?
June, with 3.01 in of precipitation in a normal year; the driest is February with 0.19 in.
What plant hardiness zone is Port Of Morgan in?
The USDA's 2023 map puts Port Of Morgan in zone 3b in ZIP code 59537, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −27°F (15 years, 1991-2020): zone 4a.
How late can frost come at Port Of Morgan?
In half of years the last 32°F night comes after May 19; in one year in ten it comes after June 2. Waiting until June 2 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Turner (11 mi N), MT25 miles from this station, 42.1°F a year
- Saco, MT43 miles from this station, 42.0°F a year
- Malta, MT44 miles from this station, 44.9°F a year
- Harlem, MT54 miles from this station, 43.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made