Freeze Watch
Starts in 11 h 23 min
When
From late tonight through Saturday morning.
Where
In New Jersey, Morris, Somerset, and Hunterdon Counties. In Pennsylvania, Berks, Lehigh, Upper Bucks, Western Chester, and Western Montgomery Counties.
Issued for this forecast zone · National Weather Service Mount Holly NJ
What, impacts and precautionsHide details
What
Sub-freezing temperatures as low as 32 possible.
Impacts
Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Precautionary actions
Take steps now to protect tender plants from the cold.
Areas: Morris; Hunterdon; Somerset; Berks; Lehigh; Western Chester; Western Montgomery; Upper Bucks
See it on weather.gov (opens in a new tab)

Observed 12:15 PM EDT at KPTW

Trooper, PA weather

Sunny and 57°14°, jacket by 7 PM.

Forecasts agree

Now 57°14°

Sunny

Wind: 9 mph15 km/h; From the east-northeast. 58–10 mph16 km/h through 12 AM
Dew point: 34°1°; Dry, static shocks likely
UV index: 4Moderate; Moderate until 4 PM
Air quality: 45Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.39 inHg1029 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

High 61°16° today at 3 PM
Below 50°10° tonight after 8 PM
Low 33°1° tomorrow at 6 AM
Above 50°10° tomorrow by 11 AM

This afternoonUp to 61°16° by 3 PM · Clear
TonightDown to 35°2° by 3 AM · Partly cloudy
Tomorrow morningUp to 54°12° by 11 AM · Partly cloudy
Tomorrow afternoonUp to 62°17° by 3 PM · Clear
Tomorrow nightDown to 34°1° by 4 AM · Clear
Sunday morningUp to 56°13° by 11 AM · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Fri 12p	Sunny	57°14° (likely 57°14° to 58°14°)	57°14°	0%	10 mph16 km/h from NE, gusts 15 mph25 km/h	42%	0%	4
Fri 1p	Sunny	59°15° (likely 58°14° to 59°15°)	59°15°	0%	10 mph16 km/h from NE, gusts 14 mph22 km/h	36%	1%	4
Fri 2p	Sunny	60°16° (likely 59°15° to 60°16°)	60°16°	0%	10 mph16 km/h from NE, gusts 12 mph20 km/h	35%	3%	4
Fri 3p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	5 mph8 km/h from NE, gusts 11 mph18 km/h	32%	2%	3
Fri 4p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	5 mph8 km/h from NE, gusts 11 mph18 km/h	33%	1%	2
Fri 5p	Sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	5 mph8 km/h from NE, gusts 10 mph16 km/h	35%	0%	1
Fri 6p	Clear	58°14° (likely 54°12° to 58°14°)	58°14°	0%	5 mph8 km/h from NE, gusts 8 mph13 km/h	37%	3%	0
Fri 7p	Clear	52°11° (likely 50°10° to 52°11°)	52°11°	0%	5 mph8 km/h from NE, gusts 7 mph11 km/h	44%	7%	0
Fri 8p	Mostly clear	48°9° (likely 48°9° to 50°10°)	45°7°	0%	5 mph8 km/h from NE, gusts 6 mph9 km/h	49%	20%	0
Fri 9p	Mostly clear	45°7° (likely 45°7° to 48°9°)	42°6°	0%	5 mph8 km/h from NE, gusts 5 mph7 km/h	53%	48%	0
Fri 10p	Partly cloudy	42°6° (likely 42°6° to 47°8°)	39°4°	0%	5 mph8 km/h from NE, gusts 5 mph8 km/h	57%	51%	0
Fri 11p	Partly cloudy	40°4° (likely 40°4° to 45°7°)	37°3°	0%	5 mph8 km/h from NE, gusts 4 mph7 km/h	62%	52%	0
Sat 12a	Mostly clear	39°4° (likely 39°4° to 44°7°)	37°3°	0%	5 mph8 km/h from NE, gusts 3 mph4 km/h	62%	54%	0
Sat 1a	Clear	37°3° (likely 37°3° to 43°6°)	34°1°	0%	5 mph8 km/h from NE, gusts 3 mph5 km/h	67%	42%	0
Sat 2a	Clear	37°3° (likely 37°3° to 42°6°)	33°1°	0%	5 mph8 km/h from NE, gusts 4 mph6 km/h	70%	40%	0
Sat 3a	Clear	35°2° (likely 35°2° to 42°6°)	31°−1°	0%	5 mph8 km/h from NE, gusts 4 mph7 km/h	75%	44%	0
Sat 4a	Partly cloudy	35°2° (likely 35°2° to 42°6°)	31°−1°	0%	5 mph8 km/h from N, gusts 4 mph7 km/h	75%	49%	0
Sat 5a	Partly cloudy	35°2° (likely 35°2° to 41°5°)	31°−1°	0%	5 mph8 km/h from N, gusts 3 mph5 km/h	75%	53%	0
Sat 6a	Partly cloudy	33°1° (likely 33°1° to 40°4°)	29°−2°	0%	5 mph8 km/h from N, gusts 4 mph7 km/h	82%	53%	0
Sat 7a	Partly sunny	34°1° (likely 34°1° to 39°4°)	30°−1°	0%	5 mph8 km/h from N, gusts 5 mph7 km/h	78%	48%	0
Sat 8a	Mostly sunny	35°2° (likely 33°1° to 39°4°)	31°−1°	0%	5 mph8 km/h from N, gusts 5 mph8 km/h	78%	49%	0
Sat 9a	Partly sunny	41°5° (likely 39°4° to 45°7°)	38°3°	0%	5 mph8 km/h from N, gusts 6 mph10 km/h	65%	23%	1
Sat 10a	Partly sunny	49°9° (likely 48°9° to 50°10°)	47°8°	0%	5 mph8 km/h from NE, gusts 5 mph8 km/h	52%	38%	2
Sat 11a	Partly sunny	54°12° (likely 53°12° to 55°13°)	54°12°	0%	5 mph8 km/h from NE, gusts 5 mph8 km/h	45%	43%	3
Sat 12p	Sunny	57°14° (likely 56°13° to 59°15°)	57°14°	0%	0 mph0 km/h, gusts 5 mph9 km/h	40%	9%	3
Sat 1p	Sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	0 mph0 km/h, gusts 5 mph8 km/h	36%	2%	4
Sat 2p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	5 mph8 km/h from S, gusts 5 mph7 km/h	33%	2%	4
Sat 3p	Sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	5 mph8 km/h from SW, gusts 4 mph6 km/h	32%	4%	3
Sat 4p	Sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	5 mph8 km/h from SW, gusts 4 mph7 km/h	32%	4%	2
Sat 5p	Sunny	61°16° (likely 58°14° to 61°16°)	61°16°	0%	5 mph8 km/h from SW, gusts 4 mph7 km/h	35%	0%	1
Sat 6p	Clear	59°15° (likely 55°13° to 59°15°)	59°15°	0%	5 mph8 km/h from SW, gusts 3 mph5 km/h	36%	0%	0
Sat 7p	Clear	55°13° (likely 51°11° to 55°13°)	55°13°	0%	5 mph8 km/h from SW, gusts 3 mph5 km/h	41%	0%	0
Sat 8p	Clear	48°9° (likely 48°9° to 51°11°)	46°8°	0%	5 mph8 km/h from SW, gusts 1 mph2 km/h	54%	1%	0
Sat 9p	Clear	45°7° (likely 45°7° to 49°9°)	43°6°	0%	5 mph8 km/h from SW, gusts 2 mph4 km/h	58%	2%	0
Sat 10p	Clear	43°6° (likely 43°6° to 47°8°)	40°4°	0%	5 mph8 km/h from SW, gusts 3 mph5 km/h	62%	1%	0
Sat 11p	Clear	41°5° (likely 41°5° to 46°8°)	39°4°	0%	5 mph8 km/h from SW, gusts 3 mph5 km/h	70%	1%	0
Sun 12a	Clear	39°4° (likely 39°4° to 44°7°)	37°3°	0%	5 mph8 km/h from W, gusts 2 mph4 km/h	76%	0%	0
Sun 1a	Clear	38°3° (likely 38°3° to 43°6°)	36°2°	0%	5 mph8 km/h from W, gusts 3 mph4 km/h	82%	0%	0
Sun 2a	Clear	36°2° (likely 35°2° to 43°6°)	32°0°	0%	5 mph8 km/h from NW, gusts 3 mph4 km/h	89%	0%	0
Sun 3a	Clear	35°2° (likely 33°1° to 42°6°)	31°−1°	0%	5 mph8 km/h from NW, gusts 3 mph5 km/h	92%	0%	0
Sun 4a	Clear	34°1° (likely 33°1° to 42°6°)	29°−2°	0%	5 mph8 km/h from NW, gusts 4 mph6 km/h	100%	0%	0
Sun 5a	Clear	34°1° (likely 32°0° to 41°5°)	29°−2°	0%	5 mph8 km/h from NW, gusts 3 mph6 km/h	100%	0%	0
Sun 6a	Clear	33°1° (likely 30°−1° to 41°5°)	28°−2°	0%	5 mph8 km/h from NW, gusts 3 mph4 km/h	100%	1%	0
Sun 7a	Sunny	33°1° (likely 29°−2° to 41°5°)	28°−2°	0%	5 mph8 km/h from NW, gusts 3 mph5 km/h	100%	2%	0
Sun 8a	Sunny	35°2° (likely 29°−2° to 42°6°)	30°−1°	0%	5 mph8 km/h from NW, gusts 3 mph5 km/h	100%	1%	0
Sun 9a	Sunny	41°5° (likely 33°1° to 48°9°)	38°3°	0%	5 mph8 km/h from NW, gusts 5 mph7 km/h	85%	1%	1
Sun 10a	Sunny	49°9° (likely 42°6° to 51°11°)	47°8°	0%	5 mph8 km/h from NW, gusts 4 mph7 km/h	63%	1%	2
Sun 11a	Sunny	56°13° (likely 51°11° to 57°14°)	56°13°	0%	5 mph8 km/h from NW, gusts 6 mph9 km/h	53%	0%	3

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 23. Mostly sunny. High 61°16°, low 33°1°. Typical 65°18° / 41°5°. Dry. Forecasts agree.
1. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
2. Evening
  6 PM–midnight
  Mostly clear, 48°9°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 35°2°
  Dry
Official NWS forecast
Today: Sunny, with a high near 61. Northeast wind 5 to 10 mph.
Tonight: Areas of frost after midnight. Partly cloudy, with a low around 33. Northeast wind around 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–61°16°
Low, likely
33°1°–45°7°
Typical high / low
65°18° / 41°5°
Wind
11 mph18 km/h, gusts 24 mph39 km/h
UV peak
4
Tomorrow, Oct 24. Mostly sunny. High 62°17°, low 33°1°. Typical 64°18° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 35°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 34°1°
  Dry
Official NWS forecast
Day: Areas of frost before 9am. Sunny, with a high near 62. South wind 0 to 5 mph.
Night: Areas of frost after midnight. Mostly clear, with a low around 33. West wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–62°17°
Low, likely
33°1°–39°4°
Typical high / low
64°18° / 41°5°
Wind
6 mph10 km/h
UV peak
4
Sunday, Oct 25. Sunny. High 65°18°, low 35°2°. Typical 64°18° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 35°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 39°4°
  Dry
Official NWS forecast
Day: Widespread frost before 9am. Sunny, with a high near 65. Northwest wind around 5 mph.
Night: Mostly clear, with a low around 35.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–65°18°
Low, likely
29°−2°–39°4°
Typical high / low
64°18° / 41°5°
Wind
5 mph8 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 69°21°, low 45°7°. Typical 64°18° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 39°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 69.
Night: Mostly clear, with a low around 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–69°21°
Low, likely
33°1°–45°7°
Typical high / low
64°18° / 40°4°
Wind
7 mph11 km/h, gusts 16 mph26 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 65°18°, low 39°4°. Typical 63°17° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 42°6°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 65.
Night: Mostly clear, with a low around 39.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–66°19°
Low, likely
39°4°–50°10°
Typical high / low
63°17° / 40°4°
Wind
8 mph12 km/h, gusts 20 mph32 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 61°16°, low 42°6°. Typical 63°17° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 61.
Night: Mostly cloudy, with a low around 42.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
58°14°–63°17°
Low, likely
37°3°–49°9°
Typical high / low
63°17° / 40°4°
Wind
7 mph10 km/h, gusts 15 mph24 km/h
UV peak
2
Thursday, Oct 29. Partly sunny. High 66°19°, low 44°7°. Typical 62°17° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 66.
Night: Partly cloudy, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–69°21°
Low, likely
40°4°–51°11°
Typical high / low
62°17° / 39°4°
Wind
13 mph21 km/h, gusts 29 mph46 km/h
UV peak
3
Friday, Oct 30. Cloudy. High 68°20°, low 49°9°. Typical 62°17° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°9°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
64°18°–72°22°
Low, likely
45°7°–52°11°
Typical high / low
62°17° / 39°4°
Wind
7 mph12 km/h, gusts 19 mph30 km/h
UV peak
4
Saturday, Oct 31. Sunny. High 61°16°, low 46°8°. Typical 62°17° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 58°15°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
55°13°–68°20°
Low, likely
38°3°–56°13°
Typical high / low
62°17° / 39°4°
Wind
9 mph15 km/h, gusts 21 mph34 km/h
UV peak
2
Sunday, Nov 1. Rain. High 62°17°, low 47°8°. Typical 61°16° / 38°3°. Rain 0.58 in15 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Rain, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Rain, 51°10°
  30% chance · 0.39 in10 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
58°14°–67°19°
Low, likely
35°2°–57°14°
Typical high / low
61°16° / 38°3°
Wind
10 mph16 km/h, gusts 29 mph47 km/h

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 33°.
Tomorrow
Dry, high 62°, low 33°.
Sunday
Dry, high 65°, low 35°, warming up.
Rest of week
Mostly dry, highs 61–69°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (PHI) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Schuylkill River at Norristown

3.8 mi

Below flood stage

Level: 8.1 ft
Flow: 1,330 cfs

Forecast peak 8.1 ft Fri 2 PM

Reading from Fri 10:30 AM · NWS gauge page

Perkiomen Creek at Graterford

6.2 mi

Below flood stage

Level: 1.1 ft
Flow: 101 cfs

Forecast peak 1.1 ft Fri 2 PM

Reading from Fri 10:15 AM · NWS gauge page

Schuylkill River at Pottstown

15 mi

Below flood stage

Level: 2.1 ft
Flow: 936 cfs

Forecast peak 2.1 ft Fri 2 PM

Reading from Fri 10:15 AM · NWS gauge page

Schuylkill River at Philadelphia

17 mi

Below flood stage

Level: 6.1 ft
Flow: 1,060 cfs

Forecast peak 6.1 ft Fri 8 PM

Reading from Fri 10 AM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 60% less heating than a typical week.

This week 37Typical 92

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 26
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 10 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 34°F).

Open the windows?

Today, 2:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

PHOENIXVILLE 1 E · official normals 1991–2020 · records 1893–2026

Oct 23, today vs a typical year

Today’s expected high is 4°2° colder than typical.

Last 7 days vs normal

—SatOct 17
—SunOct 18
—MonOct 19
—TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23

Trooper weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 49 min; Losing 2 min 30 s a day; shortest Dec 21, 1 h 31 min less
Golden hour: 5:32–6:27 PM; Morning 7:03–7:58 AM
Blue hour: 6:27–6:38 PM; Morning 6:53–7:03 AM; first light 6:53 AM

Stars tonight? Fair

Mostly clear 6:38–9 PM, but the moon is 95% lit and up.

Moon

Waxing gibbous

92% lit · growing

Today: sets 4:25 AM · rises 4:41 PM
Full moon: Oct 26
New moon: Nov 9

Looking southwest from Trooper. The highest point on the skyline is about 5,100 ft, 54 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

1 active weather alert

Freeze Watch

Trooper, PA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Sunday

Rest of week

What changed since yesterday

Radar

Rivers

Schuylkill River at Norristown

Perkiomen Creek at Graterford

Schuylkill River at Pottstown

Schuylkill River at Philadelphia

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 23, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon