Home / Rochester / 20 December 2019
Rochester
United States · 20 December 2019
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Average
11.3°C
low 10.3° · high 12.1°
Rainfall
78.5mm
rain recorded
Wind
4.6m/s
daily average
Humidity
92.8%
daily average
Cloud
100%
cover
Pressure
1007hPa
daily average
The temperature ranged from 10.3°C around 07:00 to 12.1°C around 13:00. Rain was recorded across 24 hours, from around 00:00 to 23:00 (78.5mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
92th percentile
Low temperature
100th percentile
Rainfall
100th percentile
Wind
87th 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 4.7°C, versus 11.3°C on this specific day.
Sun & daylight
Sunrise
07:53
Sunset
16:25
Day length
8h 33m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Los_Angeles.
Cumulative rainfall through the day.
| Local time | UTC | Temp °C | Feels °C | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 08:00 | 11.3 | 8.3 | 4.09 | 4.6 | SSW | 96 | 1005 |
| 01:00 | 09:00 | 11.7 | 8.8 | 4.21 | 4.8 | SSW | 98 | 1005 |
| 02:00 | 10:00 | 11.8 | 8.8 | 4.1 | 4.7 | SSW | 93 | 1006 |
| 03:00 | 11:00 | 11.6 | 8.7 | 4.12 | 4.4 | SSW | 93 | 1007 |
| 04:00 | 12:00 | 11.1 | 8.2 | 4.32 | 4 | SSW | 92 | 1007 |
| 05:00 | 13:00 | 11 | 8.5 | 3.83 | 3.5 | SSW | 93 | 1007 |
| 06:00 | 14:00 | 10.7 | 8.1 | 3.35 | 3.6 | S | 94 | 1007 |
| 07:00 | 15:00 | 10.3 | 7.3 | 3.32 | 4 | S | 92 | 1007 |
| 08:00 | 16:00 | 10.3 | 6.8 | 3.62 | 4.8 | S | 94 | 1006 |
| 09:00 | 17:00 | 10.6 | 6.7 | 4.18 | 5.6 | S | 94 | 1007 |
| 10:00 | 18:00 | 11 | 6.8 | 4.96 | 6 | SSW | 94 | 1007 |
| 11:00 | 19:00 | 11.4 | 7.6 | 2.79 | 5.6 | SSW | 92 | 1007 |
| 12:00 | 20:00 | 11.7 | 8.4 | 3.09 | 4.9 | SSW | 92 | 1008 |
| 13:00 | 21:00 | 12.1 | 9.3 | 3.44 | 4.5 | SSW | 94 | 1008 |
| 14:00 | 22:00 | 11.6 | 8.2 | 3.56 | 4.9 | S | 90 | 1007 |
| 15:00 | 23:00 | 11.4 | 8.2 | 3.47 | 4.7 | S | 91 | 1007 |
| 16:00 | 00:00 | 11.6 | 8.6 | 3.03 | 4.3 | S | 91 | 1008 |
| 17:00 | 01:00 | 11.7 | 9.3 | 2.68 | 3.7 | S | 91 | 1008 |
| 18:00 | 02:00 | 11.8 | 9.4 | 2.38 | 3.6 | S | 92 | 1007 |
| 19:00 | 03:00 | 11.4 | 8.4 | 2.17 | 4.4 | S | 93 | 1007 |
| 20:00 | 04:00 | 11.2 | 7.7 | 1.82 | 5 | S | 93 | 1008 |
| 21:00 | 05:00 | 11.1 | 7.7 | 1.91 | 5 | S | 93 | 1007 |
| 22:00 | 06:00 | 11 | 7.4 | 1.95 | 5 | S | 92 | 1008 |
| 23:00 | 07:00 | 10.9 | 7.6 | 2.12 | 4.6 | SSW | 91 | 1008 |
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
- Rochester — 46.750°, -123.000°, ERA5 grid cell center, 10.8 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 20 December 2019 specifically — not a monthly average. See the Rochester 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 (2026-07-16). Historical climate data for Rochester, United States (46.75°N, 123.00°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Rochester, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 16, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Rochester, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 16, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Rochester, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-16},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.