Montgomery Lock and Dam, Pennsylvania climate: Climate normals at a NOAA weather station
Montgomery Lock and Dam's normal year runs from 21°F January nights to 82°F July afternoons, with 40.7 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.4°C, January lows of −6°C, July highs of 28°C, 1,034 mm of precipitation a year.
- NOAA stationMontgomery Lock and Dam
- Station IDUSC00365902
- Location40.65°N 80.39°W
- Elevation690 ft (210 m)
On October 23, the normal high in Montgomery Lock and Dam is 60°F and the normal low 41°F, and the chance of measurable rain or snow is 35%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Montgomery Lock and Dam.
- Jan 35° 21°
- Feb 38° 22°
- Mar 48° 29°
- Apr 61° 38°
- May 71° 49°
- Jun 78° 57°
- Jul 82° 62°
- Aug 81° 61°
- Sep 75° 54°
- Oct 63° 44°
- Nov 50° 33°
- Dec 40° 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 at Montgomery Lock and Dam each month?
July is the warmest month, with normal highs of 82°F; January the coldest, with normal lows of 21°F. The most precipitation falls in July (4.40 in), the least in February (2.46 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 35°F | 21°F | 28.0°F | 2.90 | 14 | <1 | 25 | 9 h 30 min |
| February | 38°F | 22°F | 30.1°F | 2.46 | 12 | <1 | 23 | 10 h 40 min |
| March | 48°F | 29°F | 38.3°F | 3.12 | 12 | <1 | 19 | 11 h 50 min |
| April | 61°F | 38°F | 49.7°F | 3.58 | 14 | <1 | 7 | 13 h 10 min |
| May | 71°F | 49°F | 59.6°F | 3.75 | 13 | <1 | 1 | 14 h 20 min |
| June | 78°F | 57°F | 67.7°F | 4.29 | 12 | 1 | <1 | 15 h |
| July | 82°F | 62°F | 71.8°F | 4.40 | 11 | 4 | <1 | 14 h 50 min |
| August | 81°F | 61°F | 70.6°F | 3.41 | 9 | 3 | <1 | 13 h 50 min |
| September | 75°F | 54°F | 64.5°F | 4.14 | 9 | 1 | <1 | 12 h 30 min |
| October | 63°F | 44°F | 53.3°F | 2.94 | 11 | <1 | 1 | 11 h 10 min |
| November | 50°F | 33°F | 41.8°F | 2.78 | 11 | <1 | 13 | 10 h |
| December | 40°F | 26°F | 33.0°F | 2.92 | 13 | <1 | 22 | 9 h 20 min |
| Year (annual) | 60°F | 41°F | 50.7°F | 40.69 | 141 | 8 | 111 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 2°C | −6°C | −2.2°C | 74 mm |
| February | 4°C | −6°C | −1.1°C | 62 mm |
| March | 9°C | −2°C | 3.5°C | 79 mm |
| April | 16°C | 3°C | 9.8°C | 91 mm |
| May | 22°C | 9°C | 15.3°C | 95 mm |
| June | 26°C | 14°C | 19.8°C | 109 mm |
| July | 28°C | 17°C | 22.1°C | 112 mm |
| August | 27°C | 16°C | 21.4°C | 87 mm |
| September | 24°C | 12°C | 18.1°C | 105 mm |
| October | 17°C | 7°C | 11.8°C | 75 mm |
| November | 10°C | 1°C | 5.4°C | 71 mm |
| December | 4°C | −3°C | 0.6°C | 74 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Glenwillard Dashields Lock and Dam (12 miles away), gets 20 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00365902; 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 Montgomery Lock and Dam?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, August has the fewest days with rain (9).
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 USC00365902.
When is the last frost at Montgomery Lock and Dam?
In Montgomery Lock and Dam, the last spring frost (32°F) comes after April 28 in half of years and after May 15 in one year in ten; the first autumn frost comes before October 26 in half of years and before October 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
- April 281 year in 10 after May 15; 9 in 10 after April 15
- First autumn frost, half of years before
- October 261 year in 10 before October 9; 9 in 10 before November 6
NOAA puts the median frost-free season at 178 days, and the season without a hard freeze (28°F) at 202 days.
A hard freeze (28°F) comes after April 17 in half of springs and before November 4 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Montgomery Lock and Dam in zone 6b in ZIP code 15077, 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 7a: the coldest night of a typical year reaches 1°F (26 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 Pennsylvania · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00365902; 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 Montgomery Lock and Dam?
In a normal year in Montgomery Lock and Dam, 8 days a year reach 90°F, 111 nights fall to 32°F or colder and 141 days bring measurable precipitation.
- Days at 90°F or more
- 8a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 111a normal year
- Days that stay below freezing
- 28high of 32°F or less
- Days with 0.01 inch of precipitation
- 141a normal year
The highest temperature in this station's record (since 1961) is 105°F, on June 11, 1983; the lowest is −18°F, on January 21, 1985.
The wettest calendar year on that record is 1974, with 48.99 in; the snowiest season is 1977–78, with 42.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00365902; records: ACIS (NOAA Regional Climate Centers), station USC00365902. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Montgomery Lock and Dam?
Over a year 69% of the sunlight that would reach the ground under clear skies gets through the clouds at Montgomery Lock and Dam, 3.8 kWh per square metre a day. August is the sunniest month (78%) and December the cloudiest (52%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 53% | 1.6 |
| February | 59% | 2.4 |
| March | 61% | 3.4 |
| April | 67% | 4.6 |
| May | 70% | 5.4 |
| June | 74% | 5.9 |
| July | 77% | 5.9 |
| August | 78% | 5.3 |
| September | 76% | 4.3 |
| October | 67% | 2.9 |
| November | 65% | 2.0 |
| December | 52% | 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 many heating and cooling degree days does Montgomery Lock and Dam record?
A normal year at Montgomery Lock and Dam brings 5,811 heating degree days, 8% more than the median U.S. place (5,373), and 635 cooling degree days, 30% 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 2,917 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,147 | 0 |
| February | 977 | 0 |
| March | 828 | 0 |
| April | 462 | 3 |
| May | 200 | 33 |
| June | 39 | 121 |
| July | 6 | 217 |
| August | 9 | 182 |
| September | 87 | 72 |
| October | 369 | 8 |
| November | 698 | 0 |
| December | 990 | 0 |
| Year (annual) | 5,811 | 635 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00365902. 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.
Have recent years at Montgomery Lock and Dam been warmer than normal?
2024 averaged 54.0°F, 3.3°F above the 1991-2020 normal of 50.7°F.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2024 | 54.0°F | +3.3°F | 41.86 |
Over 36 complete years from 1962 to 2025, the station's annual mean temperature rose at a fitted 4.4°F per century (+0.25°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00365902; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Montgomery Lock and Dam's climate compare?
Montgomery Lock and Dam is warmer than 55 of the 108 places with their own NOAA record in Pennsylvania, and wetter than 10. Across the 7,247 U.S. stations with normals, its annual mean of 50.7°F is warmer than 44%.
In the Köppen classification computed from these normals, Montgomery Lock and Dam 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 Montgomery Lock and Dam share this climate record?
7 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.
- Calcutta, OH4,770 people · 9 mi W
- Chester, WV2,105 people · 10 mi W
- Industry, PA1,785 people · 1 mi NW
- Newell, WV1,252 people · 11 mi W
- Lake Tomahawk, OH851 people · 14 mi NW
- Rogers, OH189 people · 16 mi NW
- Shippingport, PA152 people · 2 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 Montgomery Lock and Dam's climate
What is the coldest month at Montgomery Lock and Dam?
January, with a normal high of 35°F and a normal low of 21°F. The warmest is July (82°F by day, 62°F at night).
Does it snow at Montgomery Lock and Dam?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Glenwillard Dashields Lock and Dam (12 miles away), records 20 inches of snow in a normal year.
What is the rainiest month at Montgomery Lock and Dam?
July, with 4.40 in of precipitation in a normal year; the driest is February with 2.46 in.
What plant hardiness zone is Montgomery Lock and Dam in?
The USDA's 2023 map puts Montgomery Lock and Dam in zone 6b in ZIP code 15077, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 1°F (26 years, 1991-2020): zone 7a.
How late can frost come at Montgomery Lock and Dam?
In half of years the last 32°F night comes after April 28; in one year in ten it comes after May 15. Waiting until May 15 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Pennsylvania climateThe statewide normals and every place in the state
- Beaver Falls, PA9 miles from this station, 50.4°F a year
- Glenwillard Dashields Lock and Dam, PA12 miles from this station, 51.7°F a year
- Carnot-Moon, PA12 miles from this station, 50.9°F a year
- Pittsburgh, PA14 miles from this station, 51.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made