Freeze Warning
Ends in 4 h 25 min
When
From midnight tonight to 9 AM EDT Saturday.
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 30 degrees expected.
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 4:15 AM EDT at KSMQ

Califon, NJ weather

Freeze Warning. 30°−1° and clear now.

Forecasts agree

Now 30°−1°

Clear · Feels like 27°−3°

Wind: 3 mph5 km/h; From the northwest. Light through 4 PM
Dew point: 30°−1°; Dry, static shocks likely
Humidity: 100%; Air 30°−1°, dew point 30°−1° · frost likely
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 70Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.49 inHg1033 hPa; Rising slowly · +0.02 inHg+0.6 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 33°1° today at 6 AM
Above 50°10° today by 11 AM
High 60°16° today at 3 PM
Below 50°10° tonight after 8 PM

TonightNear 35°2° · Partly cloudy
This morningUp to 51°11° by 11 AM · Partly cloudy
This afternoonUp to 60°16° by 3 PM · Clear
TonightDown to 37°3° by 4 AM · Clear
Tomorrow morningUp to 55°13° by 11 AM · Clear
Tomorrow afternoonUp to 63°17° by 3 PM · Clear
Tomorrow nightDown to 40°4° by 3 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 4a	Partly cloudy	35°2° (likely 34°1° to 40°4°)	35°2°	0%	0 mph0 km/h, gusts 7 mph11 km/h	82%	21%	0
Sat 5a	Clear	34°1° (likely 33°1° to 40°4°)	34°1°	0%	0 mph0 km/h, gusts 7 mph11 km/h	85%	38%	0
Sat 6a	Clear	33°1° (likely 33°1° to 40°4°)	33°1°	0%	0 mph0 km/h, gusts 6 mph9 km/h	89%	41%	0
Sat 7a	Sunny	33°1° (likely 33°1° to 39°4°)	33°1°	0%	0 mph0 km/h, gusts 5 mph8 km/h	89%	39%	0
Sat 8a	Sunny	34°1° (likely 34°1° to 40°4°)	34°1°	0%	0 mph0 km/h, gusts 5 mph8 km/h	89%	38%	0
Sat 9a	Sunny	39°4° (likely 39°4° to 44°7°)	39°4°	0%	0 mph0 km/h, gusts 4 mph6 km/h	82%	39%	1
Sat 10a	Sunny	47°8° (likely 47°8° to 51°11°)	47°8°	0%	0 mph0 km/h, gusts 3 mph5 km/h	63%	40%	2
Sat 11a	Sunny	51°11° (likely 51°11° to 56°13°)	51°11°	0%	0 mph0 km/h, gusts 4 mph6 km/h	56%	39%	3
Sat 12p	Mostly sunny	54°12° (likely 54°12° to 58°14°)	54°12°	0%	0 mph0 km/h, gusts 4 mph6 km/h	48%	24%	4
Sat 1p	Sunny	57°14° (likely 57°14° to 60°16°)	57°14°	0%	0 mph0 km/h, gusts 4 mph6 km/h	43%	23%	4
Sat 2p	Sunny	59°15° (likely 59°15° to 61°16°)	59°15°	0%	0 mph0 km/h, gusts 4 mph7 km/h	39%	32%	4
Sat 3p	Mostly sunny	60°16° (likely 59°15° to 61°16°)	60°16°	0%	0 mph0 km/h, gusts 4 mph6 km/h	36%	19%	3
Sat 4p	Sunny	60°16° (likely 59°15° to 61°16°)	60°16°	0%	0 mph0 km/h, gusts 4 mph6 km/h	36%	8%	2
Sat 5p	Sunny	59°15° (likely 58°14° to 60°16°)	59°15°	0%	0 mph0 km/h, gusts 4 mph6 km/h	37%	2%	1
Sat 6p	Clear	55°13° (likely 53°12° to 55°13°)	55°13°	0%	0 mph0 km/h, gusts 5 mph8 km/h	47%	0%	0
Sat 7p	Clear	51°11° (likely 49°9° to 51°11°)	51°11°	0%	0 mph0 km/h, gusts 4 mph7 km/h	52%	0%	0
Sat 8p	Clear	46°8° (likely 46°8° to 49°9°)	46°8°	0%	0 mph0 km/h, gusts 3 mph5 km/h	63%	0%	0
Sat 9p	Clear	45°7° (likely 45°7° to 48°9°)	45°7°	0%	0 mph0 km/h, gusts 3 mph5 km/h	62%	0%	0
Sat 10p	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	65%	0%	0
Sat 11p	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	65%	0%	0
Sun 12a	Clear	41°5° (likely 41°5° to 46°8°)	41°5°	0%	0 mph0 km/h, gusts 4 mph7 km/h	65%	0%	0
Sun 1a	Clear	40°4° (likely 40°4° to 45°7°)	40°4°	0%	0 mph0 km/h, gusts 5 mph9 km/h	67%	0%	0
Sun 2a	Clear	39°4° (likely 39°4° to 44°7°)	39°4°	0%	0 mph0 km/h, gusts 7 mph11 km/h	73%	0%	0
Sun 3a	Clear	38°3° (likely 38°3° to 43°6°)	38°3°	0%	0 mph0 km/h, gusts 7 mph11 km/h	76%	0%	0
Sun 4a	Clear	37°3° (likely 37°3° to 42°6°)	37°3°	0%	0 mph0 km/h, gusts 7 mph12 km/h	79%	0%	0
Sun 5a	Clear	37°3° (likely 37°3° to 42°6°)	37°3°	0%	0 mph0 km/h, gusts 7 mph12 km/h	82%	0%	0
Sun 6a	Clear	36°2° (likely 36°2° to 41°5°)	36°2°	0%	0 mph0 km/h, gusts 7 mph12 km/h	82%	0%	0
Sun 7a	Sunny	36°2° (likely 36°2° to 40°4°)	36°2°	0%	0 mph0 km/h, gusts 7 mph11 km/h	82%	0%	0
Sun 8a	Sunny	37°3° (likely 37°3° to 41°5°)	37°3°	0%	0 mph0 km/h, gusts 7 mph11 km/h	82%	0%	0
Sun 9a	Sunny	42°6° (likely 40°4° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 7 mph11 km/h	79%	0%	1
Sun 10a	Sunny	50°10° (likely 50°10° to 54°12°)	50°10°	0%	0 mph0 km/h, gusts 7 mph11 km/h	63%	0%	2
Sun 11a	Sunny	55°13° (likely 55°13° to 59°15°)	55°13°	0%	0 mph0 km/h, gusts 6 mph10 km/h	53%	0%	3
Sun 12p	Sunny	58°14° (likely 58°14° to 62°17°)	58°14°	0%	0 mph0 km/h, gusts 6 mph9 km/h	45%	0%	4
Sun 1p	Sunny	61°16° (likely 61°16° to 64°18°)	61°16°	0%	0 mph0 km/h, gusts 6 mph10 km/h	39%	0%	4
Sun 2p	Sunny	62°17° (likely 62°17° to 64°18°)	62°17°	0%	0 mph0 km/h, gusts 6 mph9 km/h	36%	0%	4
Sun 3p	Sunny	63°17° (likely 62°17° to 64°18°)	63°17°	0%	0 mph0 km/h, gusts 6 mph10 km/h	35%	0%	3
Sun 4p	Sunny	63°17° (likely 62°17° to 64°18°)	63°17°	0%	0 mph0 km/h, gusts 7 mph11 km/h	35%	0%	2
Sun 5p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	0 mph0 km/h, gusts 7 mph11 km/h	38%	0%	1
Sun 6p	Clear	57°14° (likely 54°12° to 57°14°)	57°14°	0%	0 mph0 km/h, gusts 6 mph10 km/h	47%	0%	0
Sun 7p	Clear	53°12° (likely 51°11° to 53°12°)	53°12°	0%	0 mph0 km/h, gusts 7 mph11 km/h	54%	0%	0
Sun 8p	Clear	48°9° (likely 48°9° to 50°10°)	48°9°	0%	0 mph0 km/h, gusts 7 mph11 km/h	65%	0%	0
Sun 9p	Clear	46°8° (likely 46°8° to 48°9°)	46°8°	0%	0 mph0 km/h, gusts 6 mph10 km/h	71%	0%	0
Sun 10p	Clear	45°7° (likely 45°7° to 48°9°)	45°7°	0%	0 mph0 km/h, gusts 5 mph9 km/h	73%	0%	0
Sun 11p	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	0 mph0 km/h, gusts 6 mph9 km/h	76%	0%	0
Mon 12a	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 6 mph10 km/h	79%	0%	0
Mon 1a	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 6 mph10 km/h	79%	0%	0
Mon 2a	Clear	41°5° (likely 41°5° to 45°7°)	41°5°	0%	0 mph0 km/h, gusts 6 mph9 km/h	82%	1%	0
Mon 3a	Clear	40°4° (likely 40°4° to 46°8°)	40°4°	0%	0 mph0 km/h, gusts 5 mph7 km/h	85%	0%	0

Days ahead

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

Today, Oct 24. Partly sunny. High 61°16°, low 32°0°. Typical 61°16° / 37°3°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 34°1°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 46°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 37°3°
  Dry
Official NWS forecast
Today: Areas of frost before 10am. Mostly sunny, with a high near 61. Northwest wind around 0 mph.
Tonight: Areas of frost. Partly cloudy, with a low around 32. North wind around 0 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–61°16°
Low, likely
32°0°–39°4°
Typical high / low
61°16° / 37°3°
Wind
6 mph9 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 64°18°, low 37°3°. Typical 61°16° / 37°3°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 40°4°
  Dry
Official NWS forecast
Day: Areas of frost before 9am. Sunny, with a high near 64. West wind around 0 mph.
Night: Clear, with a low around 37. West wind around 0 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–64°18°
Low, likely
37°3°–40°4°
Typical high / low
61°16° / 37°3°
Wind
7 mph11 km/h, gusts 12 mph19 km/h
UV peak
4
Monday, Oct 26. Sunny. High 68°20°, low 44°7°. Typical 60°16° / 36°2°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 40°5°
  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, 49°10°
  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 44.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
66°19°–68°20°
Low, likely
37°3°–44°7°
Typical high / low
60°16° / 36°2°
Wind
8 mph12 km/h, gusts 27 mph44 km/h
UV peak
4
Tuesday, Oct 27. Sunny. High 60°16°, low 36°2°. Typical 60°16° / 36°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 59°15°
  Dry
3. Evening
  6 PM–midnight
  Clear, 47°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 37°3°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 60.
Night: Mostly clear, with a low around 36.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
58°14°–61°16°
Low, likely
36°2°–45°7°
Typical high / low
60°16° / 36°2°
Wind
10 mph15 km/h, gusts 29 mph46 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 59°15°, low 41°5°. Typical 60°16° / 36°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 48°9°
  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 59.
Night: Partly cloudy, with a low around 41.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
56°13°–59°15°
Low, likely
33°1°–41°5°
Typical high / low
60°16° / 36°2°
Wind
7 mph10 km/h, gusts 18 mph28 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 65°18°, low 46°8°. Typical 59°15° / 36°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 43°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, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 65.
Night: Mostly clear, with a low around 46.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–65°18°
Low, likely
40°4°–46°8°
Typical high / low
59°15° / 36°2°
Wind
10 mph16 km/h, gusts 32 mph51 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 68°20°, low 45°7°. Typical 59°15° / 35°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–70°21°
Low, likely
42°6°–48°9°
Typical high / low
59°15° / 35°2°
Wind
9 mph14 km/h, gusts 27 mph43 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 67°19°, low 45°7°. Typical 58°14° / 35°2°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 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
60°16°–70°21°
Low, likely
45°7°–48°9°
Typical high / low
58°14° / 35°2°
Wind
8 mph13 km/h, gusts 27 mph43 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 64°18°, low 47°8°. Typical 58°14° / 34°1°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 55°13°
  20% chance
4. Overnight
  midnight–6 AM
  Drizzle, 53°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
58°14°–67°19°
Low, likely
42°6°–51°11°
Typical high / low
58°14° / 34°1°
Wind
7 mph10 km/h, gusts 19 mph31 km/h
UV peak
3
Monday, Nov 2. Drizzle. High 68°20°, low 54°12°. Typical 58°14° / 34°1°. Rain 0.18 in4.6 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 56°13°
  20% chance · 0.01 in0.3 mm
2. Afternoon
  noon–6 PM
  Cloudy, 69°20°
  20% chance · 0.09 in2.3 mm
3. Evening
  6 PM–midnight
  Cloudy, 60°15°
  20% chance · 0.08 in2.1 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
65°18°–69°21°
Low, likely
50°10°–56°13°
Typical high / low
58°14° / 34°1°
Wind
18 mph29 km/h, gusts 42 mph68 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 32°.
Tomorrow
Dry, high 64°, low 37°, warming up.
Monday
Dry, high 68°, low 44°, warming up.
Rest of week
Mostly dry, highs 59–68°.

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

South Branch Raritan River at Stanton

10 mi

Below flood stage

Level: 2.7 ft
Flow: 122 cfs

Forecast peak 2.5 ft Sat 8 AM

Reading from Sat 3 AM · NWS gauge page

South Branch Raritan River at High Bridge

3.6 mi

Below flood stage

Level: 5.9 ft
Flow: 44 cfs

Reading from Sat 2:45 AM · NWS gauge page

Spruce Run at Glen Gardner

5.6 mi

Below flood stage

Level: 2.8 ft
Flow: 8 cfs

Reading from Sat 2:20 AM · NWS gauge page

Lamington (Black) River at Pottersville

5.6 mi

Below flood stage

Level: 1.7 ft
Flow: 24 cfs

Reading from Sat 3:15 AM · NWS gauge page

For your home

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

Heating this week

About 70% less heating than a typical week.

This week 35Typical 119

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 27
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 11 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 30°F). Indoor air will run dry too — a humidifier keeping indoor relative humidity in the 30–50% range is more comfortable and cuts static shocks, without going so high it fogs cold windows.

Open the windows?

Today, 3:00 PM–4:00 PM

Good stretch to open the windows.

Is this typical?

Belvidere Bridge · official normals 1991–2020 · records 1893–2026

Oct 24, today vs a typical year

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

Last 7 days vs normal

On average 2°1° colder than normal (daily mean temperature).

−10°−6°SunOct 18
−5°−3°MonOct 19
+1°TueOct 20
+2°+1°WedOct 21
—ThuOct 22
+2°+1°FriOct 23
—SatOct 24

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

Sun & moon

Sun

Daylight: 10 h 45 min; Losing 2 min 30 s a day; shortest Dec 21, 1 h 30 min less
Golden hour: 5:27–6:23 PM; Morning 7:03–7:58 AM
Blue hour: 6:23–6:33 PM; Morning 6:52–7:03 AM; first light 6:52 AM

Stars tonight? Poor

Clouds most of the night (about 33% cover).

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:31 AM · rises 5:02 PM
Full moon: Oct 26
New moon: Nov 9

Looking northwest from Califon. The highest point on the skyline is about 4,900 ft, 24 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

Califon, NJ weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

South Branch Raritan River at Stanton

South Branch Raritan River at High Bridge

Spruce Run at Glen Gardner

Lamington (Black) River at Pottersville

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? Poor

Moon