Home / Redwood City / 31 December 2017
Redwood City
United States · 31 December 2017
← 30 December 20171 January 2018 →
Average
10.2°C
low 6.5° · high 13.8°
Rainfall
0mm
dry day
Wind
1.2m/s
daily average
Humidity
87%
daily average
Cloud
83%
cover
Pressure
1019hPa
daily average
The temperature ranged from 6.5°C around 04:00 to 13.8°C around 16:00. 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
51th percentile
Low temperature
31th percentile
Rainfall
47th percentile
Wind
12th 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 10.7°C, versus 10.2°C on this specific day.
Sun & daylight
Sunrise
07:23
Sunset
17:01
Day length
9h 37m
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 | 8 | 6.6 | 0 | 0.6 | ESE | 86 | 1017 |
| 01:00 | 09:00 | 7.6 | 6 | 0 | 1 | ESE | 91 | 1017 |
| 02:00 | 10:00 | 7.1 | 5.1 | 0 | 1.7 | ESE | 95 | 1017 |
| 03:00 | 11:00 | 6.7 | 4.6 | 0 | 1.7 | SE | 96 | 1017 |
| 04:00 | 12:00 | 6.5 | 4.7 | 0 | 1.2 | S | 96 | 1017 |
| 05:00 | 13:00 | 7.1 | 5.5 | 0 | 1.1 | SSW | 97 | 1017 |
| 06:00 | 14:00 | 7.1 | 5.6 | 0 | 1 | S | 98 | 1018 |
| 07:00 | 15:00 | 8.1 | 6.6 | 0 | 1.3 | SE | 94 | 1018 |
| 08:00 | 16:00 | 7.7 | 6 | 0 | 1.5 | SSE | 96 | 1018 |
| 09:00 | 17:00 | 9.6 | 8.7 | 0.01 | 1.1 | SSE | 98 | 1019 |
| 10:00 | 18:00 | 10.4 | 10 | 0.02 | 0.4 | SE | 94 | 1019 |
| 11:00 | 19:00 | 11.6 | 11 | 0 | 0.6 | SW | 85 | 1019 |
| 12:00 | 20:00 | 12.3 | 11.4 | 0 | 1.2 | WSW | 85 | 1019 |
| 13:00 | 21:00 | 12.9 | 11.5 | 0 | 1.3 | WSW | 74 | 1018 |
| 14:00 | 22:00 | 13.7 | 12.5 | 0 | 1.3 | WNW | 73 | 1019 |
| 15:00 | 23:00 | 13.7 | 13 | 0 | 0.9 | WNW | 74 | 1018 |
| 16:00 | 00:00 | 13.8 | 13.1 | 0 | 0.9 | WNW | 75 | 1018 |
| 17:00 | 01:00 | 13.7 | 12.6 | 0 | 1.5 | NW | 76 | 1019 |
| 18:00 | 02:00 | 12.8 | 11.3 | 0 | 1.6 | W | 76 | 1020 |
| 19:00 | 03:00 | 12.1 | 11.3 | 0 | 1 | SW | 84 | 1020 |
| 20:00 | 04:00 | 11.5 | 10.6 | 0.02 | 1 | SSW | 85 | 1020 |
| 21:00 | 05:00 | 10.4 | 9.2 | 0 | 1.2 | SSW | 86 | 1021 |
| 22:00 | 06:00 | 10.8 | 9.4 | 0 | 1.5 | SSW | 87 | 1021 |
| 23:00 | 07:00 | 10.6 | 9.6 | 0 | 1.2 | SSW | 90 | 1022 |
Nearby cities
Need this verified for an official or legal purpose? Request a weather verification report.
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
- Redwood City — 37.500°, -122.250°, ERA5 grid cell center, 2.0 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 31 December 2017 specifically — not a monthly average. See the Redwood City 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 Redwood City, United States (37.50°N, 122.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Redwood City, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 16, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Redwood City, 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 Redwood City, 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.