Home / Spanaway / 20 December 2018
Spanaway
United States · 20 December 2018
← 19 December 201821 December 2018 →
Average
9.5°C
low 4.8° · high 14.1°
Rainfall
10.1mm
rain recorded
Wind
6m/s
daily average
Humidity
78.4%
daily average
Cloud
95%
cover
Pressure
1010hPa
daily average
The temperature ranged from 4.8°C around 23:00 to 14.1°C around 06:00. Rain was recorded across 19 hours, from around 00:00 to 22:00 (10.1mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
99th percentile
Low temperature
73th percentile
Rainfall
75th percentile
Wind
99th 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 4.6°C, versus 9.5°C on this specific day.
Sun & daylight
Sunrise
07:52
Sunset
16:22
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 °C | Feels °C | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 08:00 | 8.7 | 5.1 | 0.77 | 3.7 | SE | 79 | 1013 |
| 01:00 | 09:00 | 9.4 | 6 | 0.34 | 3.8 | SE | 82 | 1011 |
| 02:00 | 10:00 | 10.3 | 6.8 | 0 | 4.2 | SSE | 84 | 1010 |
| 03:00 | 11:00 | 11.1 | 7.1 | 0 | 4.9 | SSE | 80 | 1009 |
| 04:00 | 12:00 | 12.1 | 7.4 | 0 | 5.9 | SSE | 74 | 1008 |
| 05:00 | 13:00 | 13.1 | 7.8 | 0 | 6.6 | S | 67 | 1006 |
| 06:00 | 14:00 | 14.1 | 8.1 | 0.47 | 7.6 | S | 63 | 1004 |
| 07:00 | 15:00 | 13.1 | 7.1 | 0.78 | 8.1 | S | 73 | 1003 |
| 08:00 | 16:00 | 13 | 6.8 | 0.59 | 8.4 | S | 76 | 1002 |
| 09:00 | 17:00 | 13 | 6.6 | 0.35 | 8.7 | S | 72 | 1003 |
| 10:00 | 18:00 | 12.9 | 6.6 | 0.26 | 8.5 | S | 75 | 1003 |
| 11:00 | 19:00 | 12.1 | 5.5 | 1.27 | 9.1 | SSW | 79 | 1005 |
| 12:00 | 20:00 | 11 | 4 | 0.9 | 8.7 | SW | 72 | 1008 |
| 13:00 | 21:00 | 10.1 | 3.4 | 0.22 | 7.8 | SSW | 67 | 1009 |
| 14:00 | 22:00 | 8.6 | 3.3 | 0.27 | 5.7 | SW | 74 | 1011 |
| 15:00 | 23:00 | 8.1 | 3.2 | 0.54 | 5.1 | SW | 76 | 1011 |
| 16:00 | 00:00 | 7.5 | 2.8 | 0.95 | 4.8 | SW | 79 | 1012 |
| 17:00 | 01:00 | 6.7 | 2 | 0.69 | 4.7 | SW | 81 | 1013 |
| 18:00 | 02:00 | 6.4 | 1.5 | 0.49 | 5.1 | SW | 85 | 1014 |
| 19:00 | 03:00 | 5.6 | 0.8 | 0.51 | 5 | SW | 88 | 1014 |
| 20:00 | 04:00 | 5.3 | 0.8 | 0.34 | 4.3 | SW | 88 | 1015 |
| 21:00 | 05:00 | 4.9 | 0.3 | 0.2 | 4.4 | SW | 88 | 1016 |
| 22:00 | 06:00 | 5 | 0.3 | 0.1 | 4.7 | SW | 90 | 1017 |
| 23:00 | 07:00 | 4.8 | 0.2 | 0.05 | 4.6 | SW | 90 | 1018 |
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 20 December 2018 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 (2026-07-17). 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 17, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Spanaway, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 17, 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 2026-07-17},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.