Frost Advisory
Starts in 15 h 52 min
When
From 11 PM this evening to 9 AM EDT Saturday.
Where
In Connecticut, Southern Fairfield, Southern Middlesex, Southern New Haven, and Southern New London Counties. In New York, Southern Westchester County.
Issued for this forecast zone · National Weather Service Upton NY
What, impacts and precautionsHide details
What
Temperatures as low as 33 will result in frost formation.
Impacts
Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Precautionary actions
Take steps now to protect tender plants from the cold.
Areas: Southern Fairfield; Southern New Haven; Southern Middlesex; Southern New London; Southern Westchester
See it on weather.gov (opens in a new tab)

Observed 6:35 AM EDT at KHVN

New Haven, CT weather

Clear and 45°7°.

Mostly agree

Now 45°7°

Clear · Feels like 41°5°

Wind: 7 mph11 km/h; From the north. Gusts to 20 mph32 km/h around 10 AM
Dew point: 36°2°; Comfortable
UV index: 0Low; Moderate 12–3 PM · peak 3
Air quality: 24Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.28 inHg1025 hPa; Rising · +0.09 inHg+3.0 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

3°2° cooler than this time yesterday (49°9° then, 46°8° now)

Good hours for

Above 50°10° today by 11 AM
High 57°14° today at 2 PM
Below 50°10° tonight after 8 PM
Low 36°2° tonight at 4 AM

This morningUp to 52°11° by 11 AM · Clear
This afternoonNear 56°13° · Clear
TonightDown to 36°2° by 4 AM · Partly cloudy
Tomorrow morningUp to 52°11° by 11 AM · Partly cloudy
Tomorrow afternoonUp to 59°15° by 2 PM · Partly cloudy
Tomorrow nightDown to 36°2° 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
Fri 7a	Sunny	42°6° (likely 42°6° to 46°8°)	37°3°	0%	8 mph13 km/h from N, gusts 18 mph28 km/h	76%	0%	0
Fri 8a	Sunny	41°5° (likely 41°5° to 46°8°)	36°2°	0%	8 mph13 km/h from N, gusts 17 mph27 km/h	76%	0%	0
Fri 9a	Sunny	44°7° (likely 44°7° to 48°9°)	39°4°	0%	8 mph13 km/h from N, gusts 19 mph31 km/h	65%	0%	0
Fri 10a	Sunny	49°9° (likely 49°9° to 51°11°)	45°7°	0%	9 mph14 km/h from N, gusts 20 mph32 km/h	52%	0%	1
Fri 11a	Sunny	52°11° (likely 52°11° to 54°12°)	52°11°	0%	9 mph14 km/h from N, gusts 19 mph31 km/h	44%	0%	2
Fri 12p	Sunny	54°12° (likely 54°12° to 56°13°)	54°12°	0%	9 mph14 km/h from N, gusts 17 mph28 km/h	40%	0%	3
Fri 1p	Sunny	56°13° (likely 56°13° to 58°14°)	56°13°	0%	8 mph13 km/h from N, gusts 17 mph27 km/h	37%	0%	3
Fri 2p	Sunny	57°14° (likely 57°14° to 59°15°)	57°14°	0%	8 mph13 km/h from N, gusts 16 mph25 km/h	35%	0%	3
Fri 3p	Sunny	57°14° (likely 57°14° to 60°16°)	57°14°	0%	7 mph11 km/h from N, gusts 14 mph22 km/h	35%	0%	2
Fri 4p	Sunny	57°14° (likely 57°14° to 59°15°)	57°14°	0%	7 mph11 km/h from N, gusts 12 mph20 km/h	35%	0%	1
Fri 5p	Sunny	57°14° (likely 56°13° to 58°14°)	57°14°	0%	6 mph10 km/h from N, gusts 12 mph19 km/h	35%	0%	0
Fri 6p	Clear	55°13° (likely 53°12° to 55°13°)	55°13°	0%	5 mph8 km/h from N, gusts 9 mph15 km/h	38%	0%	0
Fri 7p	Clear	51°11° (likely 50°10° to 53°12°)	51°11°	0%	3 mph5 km/h from NE, gusts 7 mph11 km/h	46%	0%	0
Fri 8p	Clear	47°8° (likely 47°8° to 51°11°)	47°8°	0%	2 mph3 km/h from NE, gusts 6 mph9 km/h	53%	1%	0
Fri 9p	Clear	43°6° (likely 43°6° to 49°9°)	43°6°	0%	2 mph3 km/h from N, gusts 7 mph11 km/h	62%	5%	0
Fri 10p	Mostly clear	41°5° (likely 41°5° to 49°9°)	41°5°	0%	2 mph3 km/h from N, gusts 7 mph11 km/h	67%	49%	0
Fri 11p	Mostly clear	39°4° (likely 39°4° to 48°9°)	39°4°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	73%	50%	0
Sat 12a	Partly cloudy	38°3° (likely 38°3° to 46°8°)	38°3°	0%	2 mph3 km/h from N, gusts 7 mph11 km/h	76%	46%	0
Sat 1a	Mostly clear	37°3° (likely 37°3° to 45°7°)	37°3°	0%	2 mph3 km/h from N, gusts 7 mph12 km/h	75%	35%	0
Sat 2a	Clear	37°3° (likely 37°3° to 44°7°)	34°1°	0%	3 mph5 km/h from N, gusts 8 mph13 km/h	75%	42%	0
Sat 3a	Clear	37°3° (likely 37°3° to 44°7°)	34°1°	0%	3 mph5 km/h from N, gusts 9 mph14 km/h	75%	43%	0
Sat 4a	Mostly clear	36°2° (likely 36°2° to 43°6°)	33°1°	0%	3 mph5 km/h from N, gusts 9 mph14 km/h	79%	43%	0
Sat 5a	Partly cloudy	36°2° (likely 36°2° to 43°6°)	33°1°	0%	3 mph5 km/h from N, gusts 9 mph14 km/h	79%	47%	0
Sat 6a	Partly cloudy	36°2° (likely 36°2° to 42°6°)	33°1°	0%	3 mph5 km/h from N, gusts 9 mph14 km/h	79%	52%	0
Sat 7a	Partly sunny	35°2° (likely 35°2° to 41°5°)	32°0°	0%	3 mph5 km/h from N, gusts 8 mph13 km/h	82%	36%	0
Sat 8a	Cloudy	36°2° (likely 36°2° to 42°6°)	33°1°	0%	3 mph5 km/h from N, gusts 7 mph12 km/h	79%	57%	0
Sat 9a	Cloudy	40°4° (likely 40°4° to 45°7°)	38°3°	0%	3 mph5 km/h from N, gusts 7 mph12 km/h	70%	59%	1
Sat 10a	Cloudy	48°9° (likely 48°9° to 49°9°)	47°8°	0%	3 mph5 km/h from N, gusts 6 mph9 km/h	51%	60%	2
Sat 11a	Cloudy	52°11° (likely 52°11° to 54°12°)	52°11°	0%	3 mph5 km/h from N, gusts 6 mph9 km/h	46%	56%	3
Sat 12p	Mostly sunny	55°13° (likely 55°13° to 57°14°)	55°13°	0%	3 mph5 km/h from NW, gusts 5 mph9 km/h	41%	49%	3
Sat 1p	Mostly sunny	57°14° (likely 56°13° to 60°16°)	57°14°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	40%	56%	4
Sat 2p	Mostly sunny	59°15° (likely 57°14° to 61°16°)	59°15°	0%	5 mph8 km/h from W, gusts 7 mph11 km/h	37%	49%	3
Sat 3p	Mostly sunny	59°15° (likely 58°14° to 61°16°)	59°15°	0%	5 mph8 km/h from W, gusts 8 mph12 km/h	37%	49%	3
Sat 4p	Mostly sunny	59°15° (likely 58°14° to 61°16°)	59°15°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	37%	28%	2
Sat 5p	Sunny	58°14° (likely 57°14° to 60°16°)	58°14°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	39%	5%	1
Sat 6p	Clear	56°13° (likely 53°12° to 57°14°)	56°13°	0%	3 mph5 km/h from W, gusts 8 mph12 km/h	42%	1%	0
Sat 7p	Clear	53°12° (likely 51°11° to 55°13°)	53°12°	0%	2 mph3 km/h from W, gusts 9 mph14 km/h	48%	0%	0
Sat 8p	Clear	46°8° (likely 46°8° to 53°12°)	46°8°	0%	1 mph2 km/h from NW, gusts 8 mph13 km/h	63%	0%	0
Sat 9p	Clear	44°7° (likely 44°7° to 52°11°)	44°7°	0%	1 mph2 km/h from NW, gusts 6 mph10 km/h	68%	0%	0
Sat 10p	Clear	42°6° (likely 42°6° to 52°11°)	42°6°	0%	1 mph2 km/h from NW, gusts 6 mph10 km/h	73%	0%	0
Sat 11p	Clear	40°4° (likely 40°4° to 51°11°)	40°4°	0%	0 mph0 km/h, gusts 6 mph10 km/h	79%	0%	0
Sun 12a	Clear	38°3° (likely 38°3° to 49°9°)	38°3°	0%	0 mph0 km/h, gusts 6 mph9 km/h	85%	0%	0
Sun 1a	Clear	37°3° (likely 37°3° to 47°8°)	37°3°	0%	1 mph2 km/h from NW, gusts 5 mph8 km/h	89%	0%	0
Sun 2a	Clear	37°3° (likely 37°3° to 46°8°)	37°3°	0%	1 mph2 km/h from NW, gusts 4 mph7 km/h	89%	0%	0
Sun 3a	Clear	36°2° (likely 36°2° to 48°9°)	36°2°	0%	1 mph2 km/h from NW, gusts 5 mph8 km/h	92%	0%	0
Sun 4a	Clear	36°2° (likely 36°2° to 48°9°)	36°2°	0%	1 mph2 km/h from N, gusts 5 mph8 km/h	89%	0%	0
Sun 5a	Clear	36°2° (likely 35°2° to 47°8°)	36°2°	0%	1 mph2 km/h from N, gusts 5 mph8 km/h	89%	3%	0
Sun 6a	Clear	35°2° (likely 34°1° to 47°8°)	35°2°	0%	1 mph2 km/h from N, gusts 5 mph8 km/h	92%	5%	0

Days ahead

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

Today, Oct 23. Sunny. High 57°14°, low 34°1°. Typical 62°17° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 47°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 36°2°
  Dry
Official NWS forecast
Today: Sunny, with a high near 57. North wind 6 to 9 mph.
Tonight: Areas of frost after 1am. Mostly clear. Low around 34, with temperatures rising to around 36 overnight. North wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
57°14°–60°16°
Low, likely
34°1°–46°8°
Typical high / low
62°17° / 46°8°
Wind
12 mph20 km/h, gusts 33 mph54 km/h
UV peak
4
Tomorrow, Oct 24. Cloudy. High 59°15°, low 35°2°. Typical 62°17° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 59°15°
  Dry
3. Evening
  6 PM–midnight
  Clear, 46°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 36°2°
  Dry
Official NWS forecast
Day: Areas of frost before 9am. Mostly sunny, with a high near 59. Northwest wind around 5 mph.
Night: Patchy frost after 3am. Clear, with a low around 35. Northwest wind 0 to 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
58°14°–61°16°
Low, likely
35°2°–41°5°
Typical high / low
62°17° / 45°7°
Wind
7 mph12 km/h, gusts 13 mph21 km/h
UV peak
4
Sunday, Oct 25. Sunny. High 62°17°, low 38°3°. Typical 61°16° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy frost before 9am. Sunny. High near 62, with temperatures falling to around 60 in the afternoon. West wind 1 to 5 mph.
Night: Clear. Low around 38, with temperatures rising to around 40 overnight.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–63°17°
Low, likely
35°2°–43°6°
Typical high / low
61°16° / 45°7°
Wind
7 mph11 km/h
UV peak
4
Monday, Oct 26. Sunny. High 67°19°, low 45°7°. Typical 61°16° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 67.
Night: Clear, with a low around 45.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–67°19°
Low, likely
37°3°–50°10°
Typical high / low
61°16° / 45°7°
Wind
8 mph13 km/h, gusts 27 mph44 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 59°15°, low 36°2°. Typical 60°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 58°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 44°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 59.
Night: Mostly clear, with a low around 36.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
56°13°–60°16°
Low, likely
36°2°–51°11°
Typical high / low
60°16° / 44°7°
Wind
13 mph21 km/h, gusts 27 mph43 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 56°13°, low 39°4°. Typical 60°16° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 54°12°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 53°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 56.
Night: Partly cloudy, with a low around 39.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
54°12°–56°13°
Low, likely
39°4°–46°8°
Typical high / low
60°16° / 44°7°
Wind
10 mph16 km/h
UV peak
3
Thursday, Oct 29. Partly sunny. High 61°16°, low 44°7°. Typical 60°16° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 55°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 61.
Night: Partly cloudy, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–64°18°
Low, likely
44°7°–54°12°
Typical high / low
60°16° / 44°7°
Wind
12 mph19 km/h, gusts 22 mph35 km/h
UV peak
4
Friday, Oct 30. Cloudy. High 65°18°, low 52°11°. Typical 59°15° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 51°10°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–68°20°
Low, likely
51°11°–54°12°
Typical high / low
59°15° / 43°6°
Wind
13 mph21 km/h, gusts 24 mph38 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 58°14°, low 48°9°. Typical 59°15° / 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  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
52°11°–65°18°
Low, likely
43°6°–56°13°
Typical high / low
59°15° / 43°6°
Wind
13 mph20 km/h, gusts 24 mph38 km/h
UV peak
3
Sunday, Nov 1. Drizzle. High 60°16°, low 50°10°. Typical 59°15° / 43°6°. Rain 0.11 in2.8 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 56°13°
  20% chance
3. Evening
  6 PM–midnight
  Drizzle, 54°12°
  30% chance · 0.08 in1.9 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
56°13°–64°18°
Low, likely
41°5°–60°16°
Typical high / low
59°15° / 43°6°
Wind
17 mph28 km/h, gusts 37 mph59 km/h

10 days15 days30 days

The outlook

Today
Dry, high 57°, low 34°.
Tomorrow
Dry, high 59°, low 35°.
Sunday
Dry, high 62°, low 38°, warming up.
Rest of week
Mostly dry, highs 56–67°.

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

For your home

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

Heating this week

About 56% less heating than a typical week.

This week 38Typical 86

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

Comfort

Dry air outside (dew point 36°F).

Open the windows?

No stretch in the next few days is comfortable enough outside, by temperature, dew point and air quality.

Is this typical?

Igor I Sikorsky Memorial Airport · official normals 1991–2020 · records 1948–2026

Oct 23, today vs a typical year

Today’s expected high is 5°3° colder than typical.

Last 7 days vs normal

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

−6°−4°SatOct 17
−8°−4°SunOct 18
−3°−2°MonOct 19
±0°TueOct 20
+2°+1°WedOct 21
+2°+1°ThuOct 22
—FriOct 23

New Haven weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 46 min; Losing 2 min 39 s a day; shortest Dec 21, 1 h 35 min less
Golden hour: 5:20–6:16 PM; Morning 6:55–7:50 AM
Blue hour: 6:16–6:26 PM; Morning 6:44–6:55 AM; first light 6:44 AM

Stars tonight? Fair

Mostly clear 6:26–10 PM, but the moon is 95% lit and up.

Moon

Waxing gibbous

91% lit · growing

Today: sets 4:14 AM · rises 4:31 PM
Full moon: Oct 26
New moon: Nov 9

Looking north from New Haven. The highest point on the skyline is about 11,200 ft, 52 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

Frost Advisory