Home / Commack / 29 September 2021
Commack
United States · 29 September 2021
← 28 September 202130 September 2021 →
Average
16.9°C
low 13.9° · high 18.8°
Rainfall
0.1mm
dry day
Wind
5.2m/s
daily average
Humidity
63.2%
daily average
Cloud
59%
cover
Pressure
1014hPa
daily average
The temperature ranged from 13.9°C around 07:00 to 18.8°C around 17:00. No measurable rain was recorded during the day.
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
30th percentile
Low temperature
15th percentile
Rainfall
49th percentile
Wind
61th 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 16.9°C on this specific day.
Sun & daylight
Sunrise
06:47
Sunset
18:37
Day length
11h 50m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/New_York.
Cumulative rainfall through the day.
| Local time | UTC | Temp °C | Feels °C | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 04:00 | 18.6 | 15.7 | 0.01 | 6.4 | NNW | 79 | 1012 |
| 01:00 | 05:00 | 17.6 | 14 | 0 | 6.9 | NNW | 78 | 1012 |
| 02:00 | 06:00 | 17 | 13.3 | 0 | 6.7 | N | 77 | 1012 |
| 03:00 | 07:00 | 16.5 | 12.6 | 0 | 6.7 | N | 78 | 1012 |
| 04:00 | 08:00 | 15.7 | 11.6 | 0 | 6.8 | N | 78 | 1012 |
| 05:00 | 09:00 | 15 | 11.1 | 0.01 | 6.2 | N | 77 | 1013 |
| 06:00 | 10:00 | 14.2 | 9.9 | 0.03 | 6.3 | N | 77 | 1014 |
| 07:00 | 11:00 | 13.9 | 9.7 | 0 | 6 | N | 76 | 1014 |
| 08:00 | 12:00 | 14.5 | 10.2 | 0 | 6 | N | 73 | 1015 |
| 09:00 | 13:00 | 14.8 | 10.4 | 0 | 5.8 | NNW | 68 | 1016 |
| 10:00 | 14:00 | 15.4 | 11.2 | 0 | 5.4 | NNW | 62 | 1016 |
| 11:00 | 15:00 | 16.5 | 12.4 | 0 | 5 | NNW | 56 | 1015 |
| 12:00 | 16:00 | 17 | 13 | 0 | 5 | NNW | 55 | 1015 |
| 13:00 | 17:00 | 17.9 | 13.4 | 0 | 5.5 | NNW | 50 | 1015 |
| 14:00 | 18:00 | 18.4 | 13.9 | 0 | 5.5 | NNW | 48 | 1014 |
| 15:00 | 19:00 | 18.6 | 14.3 | 0 | 5.4 | NNW | 49 | 1014 |
| 16:00 | 20:00 | 18.7 | 14.7 | 0 | 5.1 | NNW | 50 | 1014 |
| 17:00 | 21:00 | 18.8 | 15.3 | 0 | 4.3 | NNW | 49 | 1015 |
| 18:00 | 22:00 | 18.4 | 15 | 0 | 4.2 | NNW | 51 | 1015 |
| 19:00 | 23:00 | 18 | 14.9 | 0 | 3.9 | NNW | 54 | 1016 |
| 20:00 | 00:00 | 17.7 | 15 | 0 | 3.5 | N | 56 | 1016 |
| 21:00 | 01:00 | 17.6 | 15.1 | 0 | 3.1 | N | 57 | 1016 |
| 22:00 | 02:00 | 17.4 | 15.4 | 0 | 2.6 | N | 58 | 1017 |
| 23:00 | 03:00 | 17.5 | 16 | 0 | 1.9 | N | 59 | 1017 |
Nearby cities
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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 29 September 2021 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
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/
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/
"Historical Climate Data for Commack, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 17, 2026, www.pastclimate.com.
@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/}
}Notice something wrong with this data? Report a data issue.