Home / Spanaway / 21 December 2017
Spanaway
United States · 21 December 2017
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Average
0.6°C
low -2.7°C · high 2.8°C
Rainfall
0.4mm
dry day
Wind
1.9m/s
daily average
Humidity
76.6%
daily average
Cloud
72%
cover
Pressure
1029hPa
daily average
The temperature ranged from -2.7°C around 03:00 to 2.8°C around 14:00. Rain was recorded across 2 hours, from around 22:00 to 23:00 (0.4mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
9th percentile
Low temperature
7th percentile
Rainfall
23th percentile
Wind
24th 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 5°C, versus 0.6°C on this specific day.
Sun & daylight
Sunrise
07:53
Sunset
16:23
Day length
8h 31m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Los_Angeles.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 08:00 | -0.2°C | -3°C | 0 | 0.4 | SSW | 79 | 1031 |
| 01:00 | 09:00 | -0.7°C | -3.8°C | 0 | 0.8 | S | 76 | 1032 |
| 02:00 | 10:00 | -1.6°C | -4.9°C | 0 | 1.2 | SSE | 86 | 1032 |
| 03:00 | 11:00 | -2.7°C | -6°C | 0 | 1.2 | S | 89 | 1032 |
| 04:00 | 12:00 | -2.1°C | -5.4°C | 0 | 1.2 | S | 88 | 1032 |
| 05:00 | 13:00 | -1.7°C | -5.1°C | 0 | 1.3 | S | 85 | 1032 |
| 06:00 | 14:00 | -1.4°C | -4.9°C | 0 | 1.3 | S | 82 | 1031 |
| 07:00 | 15:00 | -1.2°C | -4.8°C | 0 | 1.5 | SSE | 80 | 1031 |
| 08:00 | 16:00 | -1.4°C | -5.2°C | 0 | 1.7 | S | 79 | 1030 |
| 09:00 | 17:00 | -0.8°C | -4.5°C | 0 | 1.7 | SSW | 79 | 1031 |
| 10:00 | 18:00 | -0.1°C | -3.7°C | 0 | 1.7 | SSW | 80 | 1031 |
| 11:00 | 19:00 | 1.6°C | -2.1°C | 0 | 1.9 | SSW | 76 | 1031 |
| 12:00 | 20:00 | 1.8°C | -2°C | 0 | 2.2 | S | 72 | 1030 |
| 13:00 | 21:00 | 2.7°C | -1.1°C | 0 | 2.2 | SSW | 70 | 1028 |
| 14:00 | 22:00 | 2.8°C | -0.8°C | 0 | 1.7 | SSW | 66 | 1028 |
| 15:00 | 23:00 | 2.6°C | -0.9°C | 0 | 1.7 | SSW | 69 | 1027 |
| 16:00 | 00:00 | 2.1°C | -1.9°C | 0 | 2.3 | S | 72 | 1027 |
| 17:00 | 01:00 | 2°C | -2.1°C | 0 | 2.6 | S | 72 | 1027 |
| 18:00 | 02:00 | 2.1°C | -2.2°C | 0 | 2.8 | S | 71 | 1026 |
| 19:00 | 03:00 | 2.2°C | -2.2°C | 0 | 2.9 | SSE | 70 | 1026 |
| 20:00 | 04:00 | 2.3°C | -2.1°C | 0.02 | 2.9 | SSE | 70 | 1025 |
| 21:00 | 05:00 | 2.3°C | -1.9°C | 0.09 | 2.7 | SSE | 72 | 1025 |
| 22:00 | 06:00 | 2.4°C | -1.6°C | 0.16 | 2.7 | S | 74 | 1025 |
| 23:00 | 07:00 | 2.5°C | -1.6°C | 0.15 | 2.9 | S | 80 | 1025 |
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
- Spanaway — 47.000°, -122.500°, ERA5 grid cell center, 12.6 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 21 December 2017 specifically — not a monthly average. See the Spanaway 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 Spanaway, United States (47.00°N, 122.50°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Spanaway, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 18, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Spanaway, 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 Spanaway, 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.