Freeze Watch
Starts in 16 h 19 min
When
From late tonight through Saturday morning.
Where
Lancaster and Lebanon Counties.
Issued for this forecast zone · National Weather Service State College PA
What, impacts and precautionsHide details
What
Sub-freezing temperatures as low as 30 possible.
Impacts
Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.
Precautionary actions
Those with agricultural interests should protect sensitive vegetation.
Areas: Lebanon; Lancaster
See it on weather.gov (opens in a new tab)

Observed 7:15 AM EDT at KLNS

Blue Ball, PA weather

Clear and 46°8°.

Forecasts agree

Now 46°8°

Clear

Wind: Calm; Up to 8 mph13 km/h through 7 PM
Dew point: 39°4°; Comfortable
UV index: 0Low; Moderate 12–3 PM · peak 3
Pressure: 30.3 inHg1026 hPa; Rising · +0.07 inHg+2.3 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

7°4° warmer than this time yesterday (38°3° then, 45°7° now)

Good hours for

Above 50°10° today by 10 AM
High 60°16° today at 2 PM
Below 50°10° tonight after 8 PM
Fog tonight 5–6 AM
Fog tomorrow 7–8 AM

This morningUp to 54°12° by 11 AM · Clear
This afternoonUp to 60°16° by 2 PM · Clear
TonightDown to 36°2° by 4 AM · Partly cloudy
Tomorrow morningUp to 54°12° by 11 AM · Partly cloudy
Tomorrow afternoonUp to 61°16° by 3 PM · Clear
Tomorrow nightDown to 36°2° by 4 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 7a	Sunny	45°7° (likely 42°6° to 45°7°)	43°6°	0%	5 mph8 km/h from NE, gusts 5 mph8 km/h	81%	6%	0
Fri 8a	Sunny	46°8° (likely 42°6° to 46°8°)	44°7°	0%	6 mph10 km/h from NE, gusts 6 mph9 km/h	77%	5%	0
Fri 9a	Sunny	48°9° (likely 47°8° to 49°9°)	45°7°	0%	7 mph11 km/h from NE, gusts 10 mph16 km/h	74%	0%	0
Fri 10a	Sunny	51°11° (likely 51°11° to 53°12°)	48°9°	0%	8 mph13 km/h from NE, gusts 19 mph30 km/h	63%	0%	1
Fri 11a	Sunny	54°12° (likely 54°12° to 55°13°)	54°12°	0%	8 mph13 km/h from NE, gusts 19 mph30 km/h	53%	5%	2
Fri 12p	Sunny	56°13° (likely 56°13° to 57°14°)	56°13°	0%	8 mph13 km/h from NE, gusts 16 mph27 km/h	47%	4%	3
Fri 1p	Sunny	58°14° (likely 58°14° to 59°15°)	58°14°	0%	7 mph11 km/h from NE, gusts 14 mph22 km/h	42%	0%	3
Fri 2p	Sunny	60°16° (likely 59°15° to 60°16°)	60°16°	0%	6 mph10 km/h from NE, gusts 12 mph20 km/h	37%	0%	3
Fri 3p	Sunny	60°16° (likely 59°15° to 60°16°)	60°16°	0%	5 mph8 km/h from NE, gusts 11 mph18 km/h	36%	0%	2
Fri 4p	Sunny	60°16° (likely 59°15° to 60°16°)	60°16°	0%	5 mph8 km/h from NE, gusts 10 mph17 km/h	35%	0%	1
Fri 5p	Sunny	59°15° (likely 58°14° to 59°15°)	59°15°	0%	3 mph5 km/h from NE, gusts 9 mph15 km/h	36%	0%	0
Fri 6p	Clear	55°13° (likely 54°12° to 55°13°)	55°13°	0%	2 mph3 km/h from NE, gusts 8 mph13 km/h	41%	29%	0
Fri 7p	Clear	52°11° (likely 49°9° to 52°11°)	52°11°	0%	2 mph3 km/h from NE, gusts 7 mph11 km/h	48%	6%	0
Fri 8p	Mostly clear	48°9° (likely 46°8° to 50°10°)	48°9°	0%	2 mph3 km/h from NE, gusts 7 mph11 km/h	56%	31%	0
Fri 9p	Cloudy	45°7° (likely 45°7° to 49°9°)	45°7°	0%	2 mph3 km/h from NE, gusts 7 mph12 km/h	70%	63%	0
Fri 10p	Partly cloudy	43°6° (likely 43°6° to 49°9°)	43°6°	0%	1 mph2 km/h from E, gusts 8 mph14 km/h	73%	60%	0
Fri 11p	Mostly clear	42°6° (likely 42°6° to 48°9°)	42°6°	0%	1 mph2 km/h from E, gusts 8 mph14 km/h	76%	52%	0
Sat 12a	Mostly clear	41°5° (likely 41°5° to 46°8°)	41°5°	0%	0 mph0 km/h, gusts 8 mph13 km/h	76%	47%	0
Sat 1a	Mostly clear	39°4° (likely 39°4° to 44°7°)	39°4°	0%	0 mph0 km/h, gusts 7 mph11 km/h	82%	36%	0
Sat 2a	Clear	39°4° (likely 39°4° to 43°6°)	39°4°	0%	0 mph0 km/h, gusts 6 mph9 km/h	82%	34%	0
Sat 3a	Mostly clear	38°3° (likely 38°3° to 42°6°)	38°3°	0%	1 mph2 km/h from E, gusts 3 mph5 km/h	85%	22%	0
Sat 4a	Partly cloudy	36°2° (likely 36°2° to 41°5°)	36°2°	0%	1 mph2 km/h from E, gusts 2 mph3 km/h	89%	41%	0
Sat 5a	Fog	36°2° (likely 34°1° to 41°5°)	36°2°	0%	2 mph3 km/h from E, gusts 1 mph2 km/h	89%	50%	0
Sat 6a	Mostly clear	36°2° (likely 35°2° to 40°4°)	36°2°	0%	1 mph2 km/h from NE, gusts 2 mph3 km/h	85%	34%	0
Sat 7a	Fog	34°1° (likely 34°1° to 40°4°)	34°1°	0%	1 mph2 km/h from NE, gusts 2 mph3 km/h	92%	37%	0
Sat 8a	Sunny	36°2° (likely 35°2° to 40°4°)	36°2°	0%	1 mph2 km/h from NE, gusts 2 mph3 km/h	89%	28%	0
Sat 9a	Sunny	41°5° (likely 39°4° to 45°7°)	41°5°	0%	1 mph2 km/h from NE, gusts 3 mph5 km/h	85%	26%	1
Sat 10a	Mostly sunny	49°9° (likely 48°9° to 51°11°)	49°9°	0%	0 mph0 km/h, gusts 4 mph6 km/h	66%	17%	2
Sat 11a	Mostly sunny	54°12° (likely 54°12° to 55°13°)	54°12°	0%	0 mph0 km/h, gusts 6 mph9 km/h	57%	18%	3
Sat 12p	Sunny	57°14° (likely 56°13° to 58°14°)	57°14°	0%	1 mph2 km/h from NE, gusts 6 mph10 km/h	49%	6%	4
Sat 1p	Sunny	58°14° (likely 58°14° to 59°15°)	58°14°	0%	1 mph2 km/h from NE, gusts 6 mph10 km/h	45%	3%	4
Sat 2p	Sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	2 mph3 km/h from N, gusts 6 mph9 km/h	41%	2%	4
Sat 3p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	2 mph3 km/h from NE, gusts 5 mph8 km/h	39%	2%	3
Sat 4p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	2 mph3 km/h from NE, gusts 5 mph8 km/h	39%	4%	2
Sat 5p	Sunny	61°16° (likely 58°14° to 61°16°)	61°16°	0%	1 mph2 km/h from E, gusts 5 mph8 km/h	39%	4%	1
Sat 6p	Clear	58°14° (likely 53°12° to 58°14°)	58°14°	0%	1 mph2 km/h from E, gusts 5 mph9 km/h	45%	2%	0
Sat 7p	Clear	53°12° (likely 50°10° to 53°12°)	53°12°	0%	0 mph0 km/h, gusts 5 mph8 km/h	54%	6%	0
Sat 8p	Clear	50°10° (likely 48°9° to 50°10°)	50°10°	0%	0 mph0 km/h, gusts 6 mph9 km/h	58%	1%	0
Sat 9p	Clear	45°7° (likely 45°7° to 49°9°)	45°7°	0%	0 mph0 km/h, gusts 5 mph8 km/h	73%	6%	0
Sat 10p	Clear	42°6° (likely 42°6° to 48°9°)	42°6°	0%	0 mph0 km/h, gusts 5 mph8 km/h	82%	6%	0
Sat 11p	Clear	41°5° (likely 41°5° to 47°8°)	41°5°	0%	0 mph0 km/h, gusts 5 mph9 km/h	85%	0%	0
Sun 12a	Clear	40°4° (likely 40°4° to 46°8°)	40°4°	0%	0 mph0 km/h, gusts 5 mph8 km/h	89%	0%	0
Sun 1a	Clear	39°4° (likely 39°4° to 45°7°)	39°4°	0%	0 mph0 km/h, gusts 4 mph6 km/h	89%	1%	0
Sun 2a	Clear	38°3° (likely 37°3° to 44°7°)	38°3°	0%	0 mph0 km/h, gusts 3 mph5 km/h	92%	0%	0
Sun 3a	Clear	37°3° (likely 31°−1° to 41°5°)	37°3°	0%	0 mph0 km/h, gusts 2 mph3 km/h	92%	0%	0
Sun 4a	Clear	36°2° (likely 30°−1° to 41°5°)	36°2°	0%	0 mph0 km/h, gusts 2 mph3 km/h	92%	0%	0
Sun 5a	Clear	36°2° (likely 29°−2° to 40°4°)	36°2°	0%	0 mph0 km/h, gusts 2 mph3 km/h	92%	0%	0
Sun 6a	Clear	34°1° (likely 28°−2° to 40°4°)	34°1°	0%	0 mph0 km/h, gusts 1 mph2 km/h	100%	0%	0

Days ahead

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

Today, Oct 23. Sunny. High 61°16°, low 34°1°. Typical 64°18° / 41°5°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 36°2°
  Dry
Official NWS forecast
Today: Sunny, with a high near 61. Northeast wind 3 to 8 mph.
Tonight: Areas of frost between 1am and 5am, then areas of frost and patchy fog. Mostly clear, with a low around 34. East wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–61°16°
Low, likely
34°1°–44°7°
Typical high / low
64°18° / 41°5°
Wind
12 mph20 km/h, gusts 22 mph35 km/h
UV peak
4
Tomorrow, Oct 24. Cloudy. High 61°16°, low 33°1°. Typical 63°17° / 41°5°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 36°2°
  Dry
Official NWS forecast
Day: Areas of frost and patchy fog before 9am. Sunny, with a high near 61. Northeast wind around 2 mph.
Night: Patchy frost after 4am. Clear, with a low around 33. Northeast wind around 1 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–61°16°
Low, likely
33°1°–40°4°
Typical high / low
63°17° / 41°5°
Wind
8 mph13 km/h
UV peak
4
Sunday, Oct 25. Sunny. High 64°18°, low 35°2°. Typical 63°17° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy frost before 9am. Sunny, with a high near 64. West wind around 2 mph.
Night: Clear, with a low around 35.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–64°18°
Low, likely
31°−1°–39°4°
Typical high / low
63°17° / 40°4°
Wind
6 mph9 km/h
UV peak
4
Monday, Oct 26. Sunny. High 68°20°, low 45°7°. Typical 63°17° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 68.
Night: Clear, with a low around 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–68°20°
Low, likely
32°0°–45°7°
Typical high / low
63°17° / 40°4°
Wind
8 mph13 km/h, gusts 17 mph27 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 65°18°, low 41°5°. Typical 62°17° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 43°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 41.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–66°19°
Low, likely
41°5°–49°9°
Typical high / low
62°17° / 40°4°
Wind
11 mph18 km/h, gusts 21 mph34 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 61°16°, low 43°6°. Typical 62°17° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 61°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 43.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–63°17°
Low, likely
38°3°–46°8°
Typical high / low
62°17° / 39°4°
Wind
9 mph15 km/h, gusts 15 mph24 km/h
UV peak
3
Thursday, Oct 29. Partly sunny. High 66°19°, low 45°7°. Typical 62°17° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°9°
  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 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–69°21°
Low, likely
40°4°–49°9°
Typical high / low
62°17° / 39°4°
Wind
14 mph22 km/h, gusts 29 mph47 km/h
UV peak
3
Friday, Oct 30. Cloudy. High 67°19°, low 48°9°. Typical 61°16° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 65°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  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
61°16°–70°21°
Low, likely
45°7°–50°10°
Typical high / low
61°16° / 39°4°
Wind
9 mph15 km/h, gusts 21 mph33 km/h
UV peak
4
Saturday, Oct 31. Sunny. High 60°16°, low 45°7°. Typical 61°16° / 38°3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 48°9°
  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
54°12°–67°19°
Low, likely
38°3°–53°12°
Typical high / low
61°16° / 38°3°
Wind
10 mph17 km/h, gusts 24 mph38 km/h
UV peak
2
Sunday, Nov 1. Showers. High 61°16°, low 48°9°. Typical 60°16° / 38°3°. Rain 0.51 in13 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Rain, 57°14°
  20% chance · 0.21 in5.4 mm
3. Evening
  6 PM–midnight
  Rain, 51°11°
  20% chance · 0.23 in5.9 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
57°14°–65°18°
Low, likely
37°3°–55°13°
Typical high / low
60°16° / 38°3°
Wind
13 mph21 km/h, gusts 28 mph45 km/h

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 34°.
Tomorrow
Dry, high 61°, low 33°.
Sunday
Dry, high 64°, low 35°, warming up.
Rest of week
Mostly dry, highs 60–68°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (CTP) (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

Conestoga River at Lancaster

13 mi

Below flood stage

Level: 3.7 ft
Flow: 274 cfs

Forecast peak 3.6 ft Fri 8 AM

Reading from Fri 6:15 AM · NWS gauge page

Schuylkill River at Reading

17 mi

Below flood stage

Level: 3.5 ft
Flow: 791 cfs

Forecast peak 3.5 ft Fri 8 AM

Reading from Fri 6:15 AM · NWS gauge page

Pequea Creek near Ronks

9.0 mi

Level: 2.4 ft
Flow: 35 cfs

Reading from Fri 6:30 AM · NWS gauge page

West Branch Brandywine Creek at Honeybrook

11 mi

Below flood stage

Level: 1.0 ft
Flow: 13 cfs

Reading from Fri 6:45 AM · NWS gauge page

For your home

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

Heating this week

About 64% less heating than a typical week.

This week 35Typical 96

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 24
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 18 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 39°F).

Open the windows?

Today, 2:00 PM–4:00 PM

Good stretch to open the windows (air quality forecast not available for part of this window).

Is this typical?

Lancaster 2 NE Filt Plant · official normals 1991–2020 · records 1949–2026

Oct 23, today vs a typical year

Today’s expected high is 3°2° colder than typical.

Last 7 days vs normal

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

Blue Ball 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 30 min less
Golden hour: 5:35–6:29 PM; Morning 7:06–8:01 AM
Blue hour: 6:29–6:40 PM; Morning 6:55–7:06 AM; first light 6:55 AM

Stars tonight? Poor

Clouds most of the night (about 39% cover).

Moon

Waxing gibbous

91% lit · growing

Today: sets 4:27 AM · rises 4:44 PM
Full moon: Oct 26
New moon: Nov 9

Looking northwest from Blue Ball. The highest point on the skyline is about 3,000 ft, 15 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

Blue Ball, PA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Sunday

Rest of week

What changed since yesterday

Radar

Rivers

Conestoga River at Lancaster

Schuylkill River at Reading

Pequea Creek near Ronks

West Branch Brandywine Creek at Honeybrook

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? Poor

Moon