Home / Altadena / 30 December 2016
Altadena
United States · 30 December 2016
← 29 December 201631 December 2016 →
Average
11.5°C
low 9.8° · high 14.3°
Rainfall
4.4mm
rain recorded
Wind
1.9m/s
daily average
Humidity
80.2%
daily average
Cloud
86%
cover
Pressure
1016hPa
daily average
The temperature ranged from 9.8°C around 10:00 to 14.3°C around 14:00. Rain was recorded across 11 hours, from around 03:00 to 23:00 (4.4mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
33th percentile
Low temperature
87th percentile
Rainfall
83th 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 11.1°C, versus 11.5°C on this specific day.
Sun & daylight
Sunrise
06:58
Sunset
16:53
Day length
9h 54m
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 | 11.8 | 8.9 | 0 | 2.7 | NNE | 64 | 1020 |
| 01:00 | 09:00 | 11.1 | 8.7 | 0 | 2.3 | NNE | 74 | 1019 |
| 02:00 | 10:00 | 11.2 | 9.2 | 0 | 1.1 | NE | 65 | 1019 |
| 03:00 | 11:00 | 10.1 | 7.3 | 0.11 | 2.3 | NNE | 68 | 1018 |
| 04:00 | 12:00 | 10.3 | 7.6 | 0.04 | 2.3 | NNE | 71 | 1017 |
| 05:00 | 13:00 | 10.2 | 7.5 | 0.05 | 2.4 | NNE | 72 | 1017 |
| 06:00 | 14:00 | 10.3 | 7.6 | 0.13 | 2.5 | NNE | 72 | 1018 |
| 07:00 | 15:00 | 10.8 | 8.3 | 0.15 | 2.3 | NNE | 73 | 1019 |
| 08:00 | 16:00 | 11 | 8.5 | 0.33 | 2.3 | NNE | 73 | 1020 |
| 09:00 | 17:00 | 10.1 | 7.5 | 0.74 | 2.5 | NNE | 78 | 1020 |
| 10:00 | 18:00 | 9.8 | 7.2 | 0.84 | 2.8 | NNE | 85 | 1019 |
| 11:00 | 19:00 | 11 | 8.8 | 0.24 | 2.7 | NE | 84 | 1018 |
| 12:00 | 20:00 | 12.6 | 11.2 | 0.12 | 1.8 | NNE | 82 | 1016 |
| 13:00 | 21:00 | 13.5 | 13 | 0.05 | 0.4 | NW | 75 | 1015 |
| 14:00 | 22:00 | 14.3 | 13 | 0.02 | 1.5 | SW | 70 | 1014 |
| 15:00 | 23:00 | 14 | 12.4 | 0.04 | 2.2 | SW | 75 | 1014 |
| 16:00 | 00:00 | 13.2 | 11.5 | 0.04 | 2.4 | SW | 81 | 1014 |
| 17:00 | 01:00 | 12.5 | 11.4 | 0.06 | 1.8 | SW | 87 | 1014 |
| 18:00 | 02:00 | 12 | 11.2 | 0.05 | 1.3 | SW | 89 | 1014 |
| 19:00 | 03:00 | 11 | 10.2 | 0.04 | 1.3 | SSW | 97 | 1014 |
| 20:00 | 04:00 | 11.4 | 10.9 | 0.05 | 1.1 | SSW | 97 | 1014 |
| 21:00 | 05:00 | 11.3 | 10.9 | 0.1 | 0.9 | S | 97 | 1014 |
| 22:00 | 06:00 | 10.9 | 10.4 | 0.16 | 1 | S | 97 | 1014 |
| 23:00 | 07:00 | 10.8 | 10.1 | 1.08 | 1.3 | S | 97 | 1014 |
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
- Altadena — 34.250°, -118.250°, ERA5 grid cell center, 12.8 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 30 December 2016 specifically — not a monthly average. See the Altadena 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 (2026-07-18). Historical climate data for Altadena, United States (34.25°N, 118.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Altadena, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 18, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Altadena, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 18, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Altadena, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-18},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.