Home / Wellesley / 9 September 2017
Wellesley
United States · 9 September 2017
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Average
16.5°C
low 11.6°C · high 21.4°C
Rainfall
0.2mm
dry day
Wind
2.3m/s
daily average
Humidity
70%
daily average
Cloud
23%
cover
Pressure
1022hPa
daily average
The temperature ranged from 11.6°C around 05:00 to 21.4°C around 14:00. 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
14th percentile
Low temperature
14th percentile
Rainfall
58th percentile
Wind
44th 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 19.8°C, versus 16.5°C on this specific day.
Sun & daylight
Sunrise
06:18
Sunset
19:04
Day length
12h 46m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/New_York.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 04:00 | 14.8°C | 13°C | 0 | 2.9 | WNW | 77 | 1020 |
| 01:00 | 05:00 | 13.6°C | 11.8°C | 0 | 2.9 | WNW | 81 | 1020 |
| 02:00 | 06:00 | 13.3°C | 11.4°C | 0 | 2.9 | NW | 81 | 1020 |
| 03:00 | 07:00 | 12.6°C | 10.6°C | 0 | 2.8 | NW | 82 | 1020 |
| 04:00 | 08:00 | 12.1°C | 9.9°C | 0 | 2.9 | NW | 84 | 1021 |
| 05:00 | 09:00 | 11.6°C | 9.2°C | 0 | 3.2 | NW | 84 | 1021 |
| 06:00 | 10:00 | 11.9°C | 9.8°C | 0 | 2.7 | NW | 83 | 1022 |
| 07:00 | 11:00 | 11.9°C | 9.6°C | 0 | 2.9 | NW | 83 | 1022 |
| 08:00 | 12:00 | 13.6°C | 11.7°C | 0 | 2.8 | NNW | 80 | 1023 |
| 09:00 | 13:00 | 15.5°C | 14.1°C | 0 | 2.8 | N | 79 | 1023 |
| 10:00 | 14:00 | 17.5°C | 16.3°C | 0 | 2.7 | NNE | 70 | 1023 |
| 11:00 | 15:00 | 19.7°C | 18.1°C | 0.03 | 2.7 | NNE | 57 | 1023 |
| 12:00 | 16:00 | 20.4°C | 19°C | 0.04 | 2.6 | NNE | 55 | 1023 |
| 13:00 | 17:00 | 21°C | 19.6°C | 0.03 | 2.4 | NNE | 53 | 1023 |
| 14:00 | 18:00 | 21.4°C | 20.4°C | 0.03 | 2.1 | NNE | 53 | 1023 |
| 15:00 | 19:00 | 21.2°C | 20.5°C | 0.03 | 1.7 | NNE | 54 | 1023 |
| 16:00 | 20:00 | 21.2°C | 20.5°C | 0.01 | 1.4 | N | 52 | 1023 |
| 17:00 | 21:00 | 20.9°C | 20.1°C | 0.02 | 1.3 | N | 52 | 1022 |
| 18:00 | 22:00 | 19.6°C | 20.3°C | 0 | 0.3 | NNW | 66 | 1023 |
| 19:00 | 23:00 | 17.6°C | 17.8°C | 0.01 | 0.7 | N | 70 | 1023 |
| 20:00 | 00:00 | 16.9°C | 16.1°C | 0 | 1.5 | NNW | 69 | 1024 |
| 21:00 | 01:00 | 16.6°C | 15.5°C | 0 | 1.8 | NW | 67 | 1024 |
| 22:00 | 02:00 | 15.5°C | 13.8°C | 0 | 2.6 | NNW | 71 | 1024 |
| 23:00 | 03:00 | 15.1°C | 13.6°C | 0 | 2.8 | NNW | 77 | 1024 |
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
- Wellesley — 42.250°, -71.250°, ERA5 grid cell center, 6.2 km from requested point
- Time zone
- America/New_York
- What's shown here
- The hourly and daily record for 9 September 2017 specifically — not a monthly average. See the Wellesley 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 (2026-07-21). Historical climate data for Wellesley, United States (42.25°N, 71.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Wellesley, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Wellesley, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 21, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Wellesley, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-21},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.