Phoenixville, Pennsylvania climate: Normal weather by month, frost dates and records
Phoenixville's normal year runs from 23°F January nights to 88°F July afternoons, with 45.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.4°C, January lows of −5°C, July highs of 31°C, 1,146 mm of precipitation a year.
- NOAA stationPhoenixville (1 mi E)
- Station IDUSC00366927
- Location40.12°N 75.49°W
- Elevation85 ft (26 m)
- From the center2 miles
- Population20,286
On October 23, the normal high in Phoenixville is 65°F and the normal low 41°F, and the chance of measurable rain or snow is 26%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Phoenixville.
- Jan 41° 23°
- Feb 44° 24°
- Mar 53° 31°
- Apr 65° 41°
- May 75° 51°
- Jun 83° 61°
- Jul 88° 66°
- Aug 86° 64°
- Sep 79° 56°
- Oct 67° 44°
- Nov 56° 34°
- Dec 45° 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 in Phoenixville each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 23°F. The most precipitation falls in July (4.57 in), the least in February (2.87 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 41°F | 23°F | 31.9°F | 3.15 | 9 | <1 | 26 | 9 h 40 min |
| February | 44°F | 24°F | 33.8°F | 2.87 | 9 | <1 | 24 | 10 h 40 min |
| March | 53°F | 31°F | 41.9°F | 3.67 | 10 | <1 | 19 | 11 h 50 min |
| April | 65°F | 41°F | 53.1°F | 3.52 | 10 | <1 | 6 | 13 h 10 min |
| May | 75°F | 51°F | 63.0°F | 3.30 | 10 | 2 | <1 | 14 h 20 min |
| June | 83°F | 61°F | 72.1°F | 3.85 | 9 | 5 | <1 | 15 h |
| July | 88°F | 66°F | 76.9°F | 4.57 | 10 | 11 | <1 | 14 h 50 min |
| August | 86°F | 64°F | 75.2°F | 4.37 | 8 | 8 | <1 | 13 h 50 min |
| September | 79°F | 56°F | 67.6°F | 4.43 | 8 | 2 | <1 | 12 h 30 min |
| October | 67°F | 44°F | 55.7°F | 3.91 | 8 | <1 | 3 | 11 h 10 min |
| November | 56°F | 34°F | 45.1°F | 3.41 | 8 | <1 | 15 | 10 h |
| December | 45°F | 27°F | 36.4°F | 4.08 | 10 | <1 | 24 | 9 h 20 min |
| Year (annual) | 65°F | 44°F | 54.4°F | 45.13 | 109 | 29 | 117 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 5°C | −5°C | −0.1°C | 80 mm |
| February | 7°C | −5°C | 1.0°C | 73 mm |
| March | 11°C | 0°C | 5.5°C | 93 mm |
| April | 18°C | 5°C | 11.7°C | 89 mm |
| May | 24°C | 11°C | 17.2°C | 84 mm |
| June | 29°C | 16°C | 22.3°C | 98 mm |
| July | 31°C | 19°C | 24.9°C | 116 mm |
| August | 30°C | 18°C | 24.0°C | 111 mm |
| September | 26°C | 13°C | 19.8°C | 113 mm |
| October | 20°C | 7°C | 13.2°C | 99 mm |
| November | 13°C | 1°C | 7.3°C | 87 mm |
| December | 7°C | −3°C | 2.4°C | 104 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Graterford (1 mi E) (8 miles away), gets 13 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00366927; 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 Phoenixville?
Normal highs sit between 65°F and 85°F in April, May, June, September and October. Of those, September has the fewest days with rain (8).
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 USC00366927.
When is the last frost in Phoenixville?
In Phoenixville, the last spring frost (32°F) comes after April 18 in half of years and after May 4 in one year in ten; the first autumn frost comes before October 27 in half of years and before October 12 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 181 year in 10 after May 4; 9 in 10 after April 3
- First autumn frost, half of years before
- October 271 year in 10 before October 12; 9 in 10 before November 9
NOAA puts the median frost-free season at 192 days, and the season without a hard freeze (28°F) at 217 days.
A hard freeze (28°F) comes after April 3 in half of springs and before November 6 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Phoenixville in zone 7a in ZIP code 19460. By the map's own method, the average of each year's coldest night over 1991-2020, Phoenixville's NOAA station is in zone 7a: the coldest night of a typical year reaches 3°F (15 complete years).
Frost dates for every NOAA station in Pennsylvania · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00366927; 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 Phoenixville?
In a normal year in Phoenixville, 29 days a year reach 90°F, 117 nights fall to 32°F or colder and 109 days bring measurable precipitation.
- Days at 90°F or more
- 29a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 117a normal year
- Days that stay below freezing
- 13high of 32°F or less
- Days with 0.01 inch of precipitation
- 109a normal year
The highest temperature in this station's record (since 1893) is 111°F, on July 10, 1936; the lowest is −19°F, on January 22, 1961.
The wettest calendar year on that record is 1979, with 59.55 in; the snowiest season is 1957–58, with 50.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00366927; records: ACIS (NOAA Regional Climate Centers), station USC00366927. Records use complete months only; a month missing more than three days is left out.
How sunny is Phoenixville?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Phoenixville, 3.9 kWh per square metre a day. July is the sunniest month (79%) and December the cloudiest (63%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 65% | 1.9 |
| February | 68% | 2.7 |
| March | 67% | 3.6 |
| April | 70% | 4.8 |
| May | 69% | 5.3 |
| June | 74% | 5.9 |
| July | 79% | 6.0 |
| August | 77% | 5.2 |
| September | 75% | 4.2 |
| October | 69% | 3.0 |
| November | 70% | 2.1 |
| December | 63% | 1.6 |
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 Phoenixville need?
A normal year in Phoenixville brings 4,985 heating degree days, 7% fewer than the median U.S. place (5,373), and 1,151 cooling degree days, 27% more 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 3,668 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,026 | 0 |
| February | 875 | 0 |
| March | 717 | 0 |
| April | 371 | 12 |
| May | 135 | 74 |
| June | 15 | 228 |
| July | 0 | 369 |
| August | 2 | 317 |
| September | 54 | 134 |
| October | 304 | 17 |
| November | 599 | 0 |
| December | 888 | 0 |
| Year (annual) | 4,985 | 1,151 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00366927. 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.
Has Phoenixville been warmer than normal lately?
Over 50 complete years from 1916 to 2025, the station's annual mean temperature rose at a fitted 2.7°F per century (+0.15°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Phoenixville's climate compare?
Phoenixville is warmer than 103 of the other 107 places with their own NOAA record in Pennsylvania, and wetter than 61. Across the 7,247 U.S. stations with normals, its annual mean of 54.4°F is warmer than 58%.
In the Köppen classification computed from these normals, Phoenixville 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 Phoenixville share this climate record?
9 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.
- Audubon, PA9,014 people · 4 mi E
- Paoli, PA6,124 people · 5 mi S
- Chesterbrook, PA5,439 people · 4 mi SE
- Berwyn, PA3,867 people · 6 mi SE
- Malvern, PA3,454 people · 6 mi S
- Mont Clare, PA2,155 people · 1 mi N
- Devon, PA1,623 people · 6 mi SE
- Oaks, PA860 people · 2 mi E
- Kimberton, PA377 people · 4 mi W
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 Phoenixville's climate
What is the coldest month in Phoenixville?
January, with a normal high of 41°F and a normal low of 23°F. The warmest is July (88°F by day, 66°F at night).
Does it snow in Phoenixville?
Yes. NOAA publishes no 1991-2020 snowfall normal for Phoenixville's NOAA station; the nearest record that keeps one, Graterford (1 mi E) (8 miles away), records 13 inches of snow in a normal year.
What is the rainiest month in Phoenixville?
July, with 4.57 in of precipitation in a normal year; the driest is February with 2.87 in.
What plant hardiness zone is Phoenixville in?
The USDA's 2023 map puts Phoenixville in zone 7a in ZIP code 19460. By the same method at Phoenixville's NOAA station, the coldest night of a typical year reaches 3°F (15 years, 1991-2020): zone 7a.
How late can frost come in Phoenixville?
In half of years the last 32°F night comes after April 18; in one year in ten it comes after May 4. Waiting until May 4 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Pennsylvania climateThe statewide normals and every place in the state
- Graterford (1 mi E), PA8 miles from this station, 52.4°F a year
- Norristown, PA8 miles from this station, 55.0°F a year
- Pottstown, PA9 miles from this station, 51.9°F a year
- West Chester, PA13 miles from this station, 52.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made