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Commack

United States · 30 September 2017

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Average

15.7°C

low 13.6° · high 18°

Rainfall

8.9mm

rain recorded

Wind

4.8m/s

daily average

Humidity

75.3%

daily average

Cloud

51%

cover

Pressure

1020hPa

daily average

The temperature ranged from 13.6°C around 22:00 to 18°C around 02:00. Rain was recorded across 12 hours, from around 03:00 to 21:00 (8.9mm total).

How unusual was this day?

Compared against the same 135 calendar days (±7 days) across the other 9 years on file.

High temperature

17th percentile

Low temperature

10th percentile

Rainfall

84th percentile

Wind

56th percentile

A percentile of 100 means this was the hottest/wettest/windiest of the comparable days on file; 50 is right in the middle. This window's average temperature was 18.5°C, versus 15.7°C on this specific day.

Sun & daylight

Sunrise

06:48

Sunset

18:36

Day length

11h 48m

Hour by hour

Temperature (line) and hourly rainfall (bars), local time — America/New_York.

↓ Download CSV
00:0006:0012:0018:0023:00

Cumulative rainfall through the day.

00:0006:0012:0018:0023:00
Local timeUTCTemp °CFeels °CRain mmWind m/sDirHumidity %Pressure hPa
00:0004:0017.415.702SSW571017
01:0005:0017.716.202.4SSW621017
02:0006:001816.402.7SW631017
03:0007:001715.20.193WSW671017
04:0008:0016.815.30.322.6WSW681017
05:0009:0016.315.10.072.4WSW741017
06:0010:0015.415.40.080.4SSE731017
07:0011:0015.515.400.6W751017
08:0012:0016.315.60.041.4NW711018
09:0013:0016.114.90.022.2NNW721018
10:0014:0016.6150.053NNW731018
11:0015:0015.813.21.54.3N741019
12:0016:0015.312.10.875.4N811020
13:0017:0015.511.71.016.4NNE821020
14:0018:0016.111.80.897.3NNE811020
15:0019:0016.812.20.877.8NNE761021
16:0020:0015.910.81.828.3NNE781021
17:0021:0015.19.70.368.4NNE791022
18:0022:0014.7100.37.4NNE821023
19:0023:0014.49.80.077NNE811024
20:0000:0013.99.30.17.2NNE841025
21:0001:0013.88.90.27.5NNE841026
22:0002:0013.68.70.097.5NNE831026
23:0003:0013.89.20.047.1NNE861027

Same date, other years

202520242023202220212020201920182016

Nearby cities

Brentwood

0km away, same day

West Babylon

0km away, same day

Central Islip

0km away, same day

West Islip

0km away, same day

Deer Park

0km away, same day

Lindenhurst

0km away, same day

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Data source & coverage — ERA5 reanalysis, 2016–2025 (10 years)details
Source
ERA5 reanalysis, accessed via the Copernicus Climate Change Service (C3S) Climate Data Store
Data type
Reanalysis — a physically consistent reconstruction combining a forecast model with historical observations, not a live station reading or a forecast
Coverage
2016–2025 (10 years) for United States
Location
Commack — 40.750°, -73.250°, ERA5 grid cell center, 10.9 km from requested point
Time zone
America/New_York
What's shown here
The hourly and daily record for 30 September 2017 specifically — not a monthly average. See the Commack climate overview for typical conditions.
Spatial resolution
0.25° (~25 km) distributed grid — ERA5's native model resolution is finer; this is the publicly distributed regridded product
Version / refreshed
Methodology v2026.07 · data last refreshed December 31, 2025
Limitations
A model reconstruction, not a station observation — hyper-local extremes (a single storm cell, an urban heat pocket) can differ from a nearby gauge. See the full methodology.
Attribution
Generated using Copernicus Climate Change Service information

Cite this data

Plain text
PastClimate (2026-07-17). Historical climate data for Commack, United States (40.75°N, 73.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
APA
PastClimate. (2026). Historical climate data for Commack, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
MLA
"Historical Climate Data for Commack, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 17, 2026, www.pastclimate.com.
BibTeX
@misc{pastclimate,
  author = {PastClimate},
  title = {Historical climate data for Commack, United States},
  year = {2026},
  note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-17},
  url = {https://www.pastclimate.com/}
}

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