Glenwillard Dashields Lock and Dam, Pennsylvania climate: Climate normals at a NOAA weather station
Glenwillard Dashields Lock and Dam's normal year runs from 21°F January nights to 84°F July afternoons, with 38.5 inches of precipitation and 20 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.9°C, January lows of −6°C, July highs of 29°C, 979 mm of precipitation a year.
- NOAA stationGlenwillard Dashields Lock and Dam
- Station IDUSC00363343
- Location40.55°N 80.21°W
- Elevation710 ft (216 m)
On October 23, the normal high in Glenwillard Dashields Lock and Dam is 60°F and the normal low 42°F, and the chance of measurable rain or snow is 33%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Glenwillard Dashields Lock and Dam.
- Jan 36° 21°
- Feb 39° 22°
- Mar 48° 28°
- Apr 61° 40°
- May 72° 51°
- Jun 80° 60°
- Jul 84° 64°
- Aug 83° 63°
- Sep 76° 56°
- Oct 64° 45°
- Nov 50° 34°
- Dec 40° 27°
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 Glenwillard Dashields Lock and Dam each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 21°F. The most precipitation falls in June (4.22 in), the least in January (2.59 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 36°F | 21°F | 28.2°F | 2.59 | 9.1 | 15 | <1 | 24 | 9 h 30 min |
| February | 39°F | 22°F | 30.9°F | 2.68 | 5.2 | 13 | <1 | 22 | 10 h 40 min |
| March | 48°F | 28°F | 38.1°F | 3.20 | 2.6 | 13 | <1 | 16 | 11 h 50 min |
| April | 61°F | 40°F | 50.5°F | 3.59 | 0.0 | 12 | <1 | 4 | 13 h 10 min |
| May | 72°F | 51°F | 61.2°F | 3.55 | 0.0 | 12 | 2 | <1 | 14 h 20 min |
| June | 80°F | 60°F | 69.7°F | 4.22 | 0.0 | 11 | 5 | <1 | 15 h |
| July | 84°F | 64°F | 73.9°F | 3.86 | 0.0 | 9 | 11 | <1 | 14 h 50 min |
| August | 83°F | 63°F | 72.6°F | 3.16 | 0.0 | 9 | 5 | <1 | 13 h 50 min |
| September | 76°F | 56°F | 65.8°F | 3.45 | 0.0 | 9 | 3 | <1 | 12 h 30 min |
| October | 64°F | 45°F | 54.2°F | 2.78 | 0.1 | 10 | <1 | <1 | 11 h 10 min |
| November | 50°F | 34°F | 42.1°F | 2.68 | 0.3 | 11 | <1 | 10 | 10 h |
| December | 40°F | 27°F | 33.7°F | 2.79 | 2.5 | 13 | <1 | 18 | 9 h 20 min |
| Year (annual) | 61°F | 43°F | 51.7°F | 38.55 | 19.8 | 138 | 26 | 93 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −6°C | −2.1°C | 66 mm | 23 cm |
| February | 4°C | −5°C | −0.6°C | 68 mm | 13 cm |
| March | 9°C | −2°C | 3.4°C | 81 mm | 7 cm |
| April | 16°C | 4°C | 10.3°C | 91 mm | 0 cm |
| May | 22°C | 10°C | 16.2°C | 90 mm | 0 cm |
| June | 27°C | 15°C | 20.9°C | 107 mm | 0 cm |
| July | 29°C | 18°C | 23.3°C | 98 mm | 0 cm |
| August | 28°C | 17°C | 22.6°C | 80 mm | 0 cm |
| September | 24°C | 13°C | 18.8°C | 88 mm | 0 cm |
| October | 18°C | 7°C | 12.3°C | 71 mm | 0 cm |
| November | 10°C | 1°C | 5.6°C | 68 mm | 1 cm |
| December | 5°C | −3°C | 0.9°C | 71 mm | 6 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00363343; 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 Glenwillard Dashields Lock and Dam?
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 (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 USC00363343.
When is the last frost at Glenwillard Dashields Lock and Dam?
In Glenwillard Dashields Lock and Dam, the last spring frost (32°F) comes after April 8 in half of years and after April 26 in one year in ten; the first autumn frost comes before November 8 in half of years and before October 27 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 81 year in 10 after April 26; 9 in 10 after March 25
- First autumn frost, half of years before
- November 81 year in 10 before October 27; 9 in 10 before November 24
NOAA puts the median frost-free season at 212 days, and the season without a hard freeze (28°F) at 235 days.
A hard freeze (28°F) comes after March 29 in half of springs and before November 18 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Glenwillard Dashields Lock and Dam in zone 7a in ZIP code 15056, the nearest ZIP area.
Frost dates for every NOAA station in Pennsylvania · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00363343; 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 at Glenwillard Dashields Lock and Dam?
In a normal year in Glenwillard Dashields Lock and Dam, 26 days a year reach 90°F, 93 nights fall to 32°F or colder and 138 days bring measurable precipitation.
- Days at 90°F or more
- 26a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 93a normal year
- Days that stay below freezing
- 23high of 32°F or less
- Days with 0.01 inch of precipitation
- 138a normal year
- Days with 1 inch of snow or more
- 8a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00363343.
How sunny is it at Glenwillard Dashields Lock and Dam?
Over a year 69% of the sunlight that would reach the ground under clear skies gets through the clouds at Glenwillard Dashields 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 Glenwillard Dashields Lock and Dam record?
A normal year at Glenwillard Dashields Lock and Dam brings 5,644 heating degree days, 5% more than the median U.S. place (5,373), and 840 cooling degree days, 7% 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 3,218 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,142 | 0 |
| February | 956 | 0 |
| March | 836 | 1 |
| April | 438 | 2 |
| May | 167 | 49 |
| June | 21 | 162 |
| July | 1 | 277 |
| August | 4 | 241 |
| September | 73 | 97 |
| October | 348 | 12 |
| November | 687 | 0 |
| December | 972 | 0 |
| Year (annual) | 5,644 | 840 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00363343. 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 Glenwillard Dashields Lock and Dam been warmer than normal?
2024 averaged 55.4°F, 3.7°F above the 1991-2020 normal of 51.7°F. 2 of the 2 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 53.8°F | +2.1°F | 31.32 | – |
| 2024 | 55.4°F | +3.7°F | 35.14 | – |
Source: observed years: ACIS, station USC00363343. A year counts only with all twelve months complete.
How does Glenwillard Dashields Lock and Dam's climate compare?
Glenwillard Dashields Lock and Dam is warmer than 69 of the 108 places with their own NOAA record in Pennsylvania, and wetter than 3. Across the 7,247 U.S. stations with normals, its annual mean of 51.7°F is warmer than 48%.
In the Köppen classification computed from these normals, Glenwillard Dashields 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 Glenwillard Dashields Lock and Dam share this climate record?
16 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.
- Aliquippa, PA9,003 people · 5 mi NW
- Economy, PA8,990 people · 7 mi N
- Ambridge, PA6,886 people · 3 mi N
- Baden, PA3,813 people · 6 mi N
- Sewickley, PA3,770 people · 2 mi SE
- Seven Fields, PA2,861 people · 12 mi NE
- Edgeworth, PA1,631 people · 1 mi NE
- Bell Acres, PA1,468 people · 3 mi NE
- Ambridge Heights, PA1,394 people · 3 mi N
- Bradford Woods, PA1,141 people · 9 mi NE
- Leetsdale, PA1,119 people · 1 mi NW
- Sewickley Heights, PA824 people · 3 mi E
- Sewickley Hills, PA687 people · 4 mi E
- Glen Osborne, PA568 people · 2 mi SE
- South Heights, PA374 people · 2 mi NW
- Haysville, PA79 people · 3 mi SE
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 Glenwillard Dashields Lock and Dam's climate
What is the coldest month at Glenwillard Dashields Lock and Dam?
January, with a normal high of 36°F and a normal low of 21°F. The warmest is July (84°F by day, 64°F at night).
Does it snow at Glenwillard Dashields Lock and Dam?
Yes: 20 inches in a normal year, falling on 10 days with 0.1 inch or more, the most in January (9.1 inches).
What is the rainiest month at Glenwillard Dashields Lock and Dam?
June, with 4.22 in of precipitation in a normal year; the driest is January with 2.59 in.
What plant hardiness zone is Glenwillard Dashields Lock and Dam in?
The USDA's 2023 map puts Glenwillard Dashields Lock and Dam in zone 7a in ZIP code 15056, the nearest ZIP area.
How late can frost come at Glenwillard Dashields Lock and Dam?
In half of years the last 32°F night comes after April 8; in one year in ten it comes after April 26. Waiting until April 26 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Pennsylvania climateThe statewide normals and every place in the state
- Carnot-Moon, PA1 miles from this station, 50.9°F a year
- Pittsburgh, PA4 miles from this station, 51.8°F a year
- Emsworth, PA7 miles from this station, 52.6°F a year
- Montgomery Lock and Dam, PA12 miles from this station, 50.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made