Freeze Warning
Ends in 5 h 3 min
When
Until 9 AM EDT Saturday.
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
Freezing conditions could kill crops and other sensitive vegetation.
Precautionary actions
Take steps to protect tender plants and vegetation from the cold if you wish to extend the growing season.
Areas: Lebanon; Lancaster
See it on weather.gov (opens in a new tab)

Observed 3:35 AM EDT at KLNS

Mount Gretna, PA weather

Freeze Warning. 37°3° and clear now.

Forecasts agree

Now 37°3°

Clear

Wind: Calm; Light through 3 PM
Dew point: 36°2°; Comfortable
Humidity: 93%; Air 37°3°, dew point 36°2° · fog or dew likely
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 84Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.49 inHg1033 hPa; Steady over the last 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

15°8° cooler than this time yesterday (54°12° then, 39°4° now)

Good hours for

Low 36°2° today at 8 AM
Above 50°10° today by 11 AM
High 61°16° today at 4 PM
Below 50°10° tonight after 8 PM

TonightNear 38°3° · Clear
This morningUp to 52°11° by 11 AM · Clear
This afternoonUp to 61°16° by 4 PM · Clear
TonightDown to 37°3° by 5 AM · Clear
Tomorrow morningUp to 53°12° by 11 AM · Clear
Tomorrow afternoonUp to 63°17° by 4 PM · Clear
Tomorrow nightDown to 41°5° by 2 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
Sat 3a	Clear	38°3° (likely 38°3° to 40°4°)	38°3°	0%	1 mph2 km/h from E, gusts 4 mph7 km/h	89%	6%	0
Sat 4a	Clear	38°3° (likely 37°3° to 39°4°)	38°3°	0%	1 mph2 km/h from E, gusts 3 mph5 km/h	85%	3%	0
Sat 5a	Clear	37°3° (likely 37°3° to 38°3°)	37°3°	0%	2 mph3 km/h from E, gusts 3 mph5 km/h	89%	17%	0
Sat 6a	Clear	37°3° (likely 35°2° to 38°3°)	37°3°	0%	2 mph3 km/h from E, gusts 4 mph6 km/h	89%	21%	0
Sat 7a	Sunny	37°3° (likely 35°2° to 38°3°)	37°3°	0%	1 mph2 km/h from NE, gusts 4 mph6 km/h	89%	20%	0
Sat 8a	Sunny	36°2° (likely 35°2° to 38°3°)	36°2°	0%	2 mph3 km/h from NE, gusts 4 mph7 km/h	92%	15%	0
Sat 9a	Sunny	41°5° (likely 40°4° to 43°6°)	41°5°	0%	1 mph2 km/h from NE, gusts 5 mph8 km/h	85%	2%	1
Sat 10a	Sunny	48°9° (likely 47°8° to 50°10°)	48°9°	0%	1 mph2 km/h from NE, gusts 4 mph6 km/h	68%	0%	2
Sat 11a	Sunny	52°11° (likely 51°11° to 55°13°)	52°11°	0%	1 mph2 km/h from E, gusts 4 mph6 km/h	59%	0%	3
Sat 12p	Sunny	55°13° (likely 54°12° to 58°14°)	55°13°	0%	1 mph2 km/h from SE, gusts 4 mph6 km/h	51%	0%	4
Sat 1p	Sunny	58°14° (likely 56°13° to 59°15°)	58°14°	0%	2 mph3 km/h from SE, gusts 4 mph6 km/h	44%	0%	4
Sat 2p	Sunny	59°15° (likely 57°14° to 60°16°)	59°15°	0%	2 mph3 km/h from SE, gusts 4 mph6 km/h	40%	0%	4
Sat 3p	Sunny	59°15° (likely 58°14° to 60°16°)	59°15°	0%	0 mph0 km/h, gusts 4 mph7 km/h	40%	0%	3
Sat 4p	Sunny	61°16° (likely 58°14° to 61°16°)	61°16°	0%	0 mph0 km/h, gusts 4 mph7 km/h	36%	0%	2
Sat 5p	Sunny	59°15° (likely 57°14° to 59°15°)	59°15°	0%	1 mph2 km/h from SE, gusts 4 mph6 km/h	39%	0%	1
Sat 6p	Clear	57°14° (likely 53°12° to 57°14°)	57°14°	0%	1 mph2 km/h from SE, gusts 3 mph5 km/h	45%	0%	0
Sat 7p	Clear	53°12° (likely 50°10° to 53°12°)	53°12°	0%	1 mph2 km/h from SE, gusts 1 mph2 km/h	52%	0%	0
Sat 8p	Clear	49°9° (likely 47°8° to 49°9°)	49°9°	0%	1 mph2 km/h from SE, gusts 2 mph3 km/h	61%	0%	0
Sat 9p	Clear	47°8° (likely 45°7° to 47°8°)	47°8°	0%	0 mph0 km/h, gusts 4 mph7 km/h	63%	0%	0
Sat 10p	Clear	45°7° (likely 44°7° to 47°8°)	45°7°	0%	0 mph0 km/h, gusts 5 mph7 km/h	68%	0%	0
Sat 11p	Clear	44°7° (likely 43°6° to 45°7°)	44°7°	0%	0 mph0 km/h, gusts 6 mph9 km/h	70%	0%	0
Sun 12a	Clear	42°6° (likely 42°6° to 44°7°)	42°6°	0%	0 mph0 km/h, gusts 5 mph9 km/h	79%	0%	0
Sun 1a	Clear	41°5° (likely 41°5° to 44°7°)	41°5°	0%	0 mph0 km/h, gusts 5 mph7 km/h	82%	0%	0
Sun 2a	Clear	40°4° (likely 40°4° to 43°6°)	40°4°	0%	0 mph0 km/h, gusts 4 mph6 km/h	82%	0%	0
Sun 3a	Clear	39°4° (likely 39°4° to 42°6°)	39°4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	85%	0%	0
Sun 4a	Clear	38°3° (likely 38°3° to 42°6°)	38°3°	0%	0 mph0 km/h, gusts 2 mph3 km/h	85%	0%	0
Sun 5a	Clear	37°3° (likely 37°3° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 1 mph2 km/h	85%	0%	0
Sun 6a	Clear	37°3° (likely 36°2° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 2 mph3 km/h	89%	0%	0
Sun 7a	Sunny	37°3° (likely 35°2° to 40°4°)	37°3°	0%	0 mph0 km/h, gusts 1 mph2 km/h	85%	0%	0
Sun 8a	Sunny	36°2° (likely 35°2° to 40°4°)	36°2°	0%	0 mph0 km/h, gusts 2 mph3 km/h	92%	0%	0
Sun 9a	Sunny	41°5° (likely 38°3° to 44°7°)	41°5°	0%	0 mph0 km/h, gusts 2 mph3 km/h	89%	0%	1
Sun 10a	Sunny	48°9° (likely 48°9° to 50°10°)	48°9°	0%	0 mph0 km/h, gusts 3 mph5 km/h	71%	0%	2
Sun 11a	Sunny	53°12° (likely 53°12° to 55°13°)	53°12°	0%	1 mph2 km/h from W, gusts 4 mph6 km/h	61%	1%	3
Sun 12p	Sunny	56°13° (likely 56°13° to 59°15°)	56°13°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	55%	2%	4
Sun 1p	Sunny	60°16° (likely 57°14° to 61°16°)	60°16°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	47%	2%	4
Sun 2p	Sunny	62°17° (likely 58°14° to 62°17°)	62°17°	0%	3 mph5 km/h from W, gusts 6 mph9 km/h	44%	2%	4
Sun 3p	Sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	3 mph5 km/h from SW, gusts 6 mph10 km/h	44%	2%	3
Sun 4p	Sunny	63°17° (likely 59°15° to 63°17°)	63°17°	0%	2 mph3 km/h from SW, gusts 7 mph11 km/h	43%	2%	2
Sun 5p	Sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	2 mph3 km/h from SW, gusts 7 mph11 km/h	46%	2%	1
Sun 6p	Clear	59°15° (likely 55°13° to 59°15°)	59°15°	0%	1 mph2 km/h from SW, gusts 5 mph8 km/h	51%	2%	0
Sun 7p	Clear	55°13° (likely 51°11° to 55°13°)	55°13°	0%	0 mph0 km/h, gusts 4 mph6 km/h	61%	2%	0
Sun 8p	Clear	50°10° (likely 48°9° to 50°10°)	50°10°	0%	0 mph0 km/h, gusts 6 mph10 km/h	71%	0%	0
Sun 9p	Clear	48°9° (likely 45°7° to 50°10°)	48°9°	0%	0 mph0 km/h, gusts 5 mph8 km/h	77%	0%	0
Sun 10p	Clear	46°8° (likely 43°6° to 49°9°)	46°8°	0%	0 mph0 km/h, gusts 5 mph7 km/h	83%	0%	0
Sun 11p	Clear	45°7° (likely 41°5° to 48°9°)	45°7°	0%	0 mph0 km/h, gusts 5 mph8 km/h	86%	0%	0
Mon 12a	Clear	44°7° (likely 40°4° to 46°8°)	44°7°	0%	1 mph2 km/h from SW, gusts 4 mph7 km/h	86%	0%	0
Mon 1a	Clear	42°6° (likely 39°4° to 45°7°)	42°6°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	93%	2%	0
Mon 2a	Clear	41°5° (likely 37°3° to 44°7°)	41°5°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	92%	2%	0

Days ahead

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

Today, Oct 24. Sunny. High 61°16°, low 36°2°. Typical 61°16° / 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, 49°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 37°3°
  Dry
Official NWS forecast
Today: Widespread frost before 9am. Sunny, with a high near 61. Southeast wind around 2 mph.
Tonight: Widespread frost. Mostly clear, with a low around 36. East wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
58°14°–61°16°
Low, likely
35°2°–38°3°
Typical high / low
61°16° / 41°5°
Wind
7 mph11 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 64°18°, low 37°3°. Typical 61°16° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 36°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, 38°3°
  Dry
Official NWS forecast
Day: Areas of frost and patchy fog before 9am. Sunny, with a high near 64. Northwest wind 0 to 3 mph.
Night: Patchy fog between 2am and 4am. Clear, with a low around 37. Southwest wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–64°18°
Low, likely
34°1°–40°4°
Typical high / low
61°16° / 41°5°
Wind
7 mph10 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 68°20°, low 45°7°. Typical 60°16° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 38°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, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 68.
Night: Mostly clear, with a low around 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–68°20°
Low, likely
34°1°–45°7°
Typical high / low
60°16° / 40°4°
Wind
10 mph16 km/h, gusts 16 mph26 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 63°17°, low 40°4°. Typical 60°16° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 49°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 39°4°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 63.
Night: Mostly clear, with a low around 40.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–64°18°
Low, likely
40°4°–46°8°
Typical high / low
60°16° / 40°4°
Wind
11 mph17 km/h, gusts 21 mph33 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 61°16°, low 44°7°. Typical 60°16° / 40°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 58°15°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 43°6°
  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 44.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
56°13°–62°17°
Low, likely
36°2°–44°7°
Typical high / low
60°16° / 40°4°
Wind
8 mph13 km/h, gusts 17 mph28 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 68°20°, low 48°9°. Typical 59°15° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 68.
Night: Mostly clear, with a low around 48.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
61°16°–68°20°
Low, likely
39°4°–48°9°
Typical high / low
59°15° / 39°4°
Wind
9 mph14 km/h, gusts 25 mph40 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 70°21°, low 44°7°. Typical 59°15° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 44°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 70.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
65°18°–71°22°
Low, likely
41°5°–47°8°
Typical high / low
59°15° / 39°4°
Wind
10 mph16 km/h, gusts 20 mph31 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 66°19°, low 44°7°. Typical 58°14° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 46°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
60°16°–72°22°
Low, likely
40°4°–49°9°
Typical high / low
58°14° / 39°4°
Wind
8 mph13 km/h, gusts 17 mph27 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 64°18°, low 47°8°. Typical 58°14° / 38°3°. Rain 0.02 in0.5 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 55°13°
  20% chance
4. Overnight
  midnight–6 AM
  Partly cloudy, 54°12°
  20% chance
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°–69°21°
Low, likely
43°6°–54°12°
Typical high / low
58°14° / 38°3°
Wind
11 mph17 km/h, gusts 22 mph35 km/h
UV peak
1
Monday, Nov 2. Drizzle. High 64°18°, low 56°13°. Typical 58°14° / 38°3°. Rain 0.24 in6.1 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 58°14°
  Dry
2. Afternoon
  noon–6 PM
  Drizzle, 65°18°
  20% chance · 0.1 in2.6 mm
3. Evening
  6 PM–midnight
  Partly cloudy, 57°14°
  20% chance · 0.05 in1.4 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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–68°20°
Low, likely
52°11°–58°14°
Typical high / low
58°14° / 38°3°
Wind
17 mph27 km/h, gusts 37 mph60 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 36°.
Tomorrow
Dry, high 64°, low 37°, warming up.
Monday
Dry, high 68°, low 45°, warming up.
Rest of week
Mostly dry, highs 61–70°.

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

Swatara Creek near Hershey

11 mi

Below flood stage

Level: 1.8 ft
Flow: 318 cfs

Forecast peak 1.9 ft Sat 8 AM

Reading from Sat 2:45 AM · NWS gauge page

Swatara Creek at Harper Tavern

12 mi

Below flood stage

Level: 0.7 ft
Flow: 220 cfs

Forecast peak 0.7 ft Sat 8 AM

Reading from Sat 2:15 AM · NWS gauge page

Susquehanna River at Marietta

14 mi

Below flood stage

Level: 34.4 ft
Flow: 13,700 cfs

Forecast peak 34.4 ft Sat 8 AM

Reading from Sat 2:30 AM · NWS gauge page

Swatara Creek at Middletown

14 mi

Below flood stage

Level: 2.3 ft

Forecast peak 2.2 ft Sat 8 AM

Reading from Sat 2:15 AM · NWS gauge page

For your home

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

Heating this week

About 68% less heating than a typical week.

This week 33Typical 105

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 17 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 36°F).

Open the windows?

Sun, 1:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

LEBANON 2 W · official normals 1991–2020 · records 1965–2026

Oct 24, today vs a typical year

Today’s expected high is about typical for the date.

Last 7 days vs normal

—SunOct 18
—MonOct 19
—TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23
—SatOct 24

Mount Gretna weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 47 min; Losing 2 min 30 s a day; shortest Dec 21, 1 h 28 min less
Golden hour: 5:35–6:30 PM; Morning 7:09–8:04 AM
Blue hour: 6:30–6:40 PM; Morning 6:58–7:09 AM; first light 6:58 AM

Stars tonight? Good

Mostly clear 3:57–6:58 AM; moon 96% lit, sets 5:38 AM.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:38 AM · rises 5:09 PM
Full moon: Oct 26
New moon: Nov 9

Looking north from Mount Gretna. The highest point on the skyline is about 1,700 ft, 21 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 Warning

Mount Gretna, PA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Swatara Creek near Hershey

Swatara Creek at Harper Tavern

Susquehanna River at Marietta

Swatara Creek at Middletown

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Good

Moon