Home / Algonquin / 18 May 2021
Algonquin
United States · 18 May 2021
Average
17.9°C
low 13.5°C · high 21.7°C
Rainfall
4.2mm
rain recorded
Wind
3.9m/s
daily average
Humidity
78.5%
daily average
Cloud
88%
cover
Pressure
1022hPa
daily average
The temperature ranged from 13.5°C around 04:00 to 21.7°C around 15:00. Rain was recorded across 8 hours, from around 16:00 to 23:00 (4.2mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
56th percentile
Low temperature
80th percentile
Rainfall
76th percentile
Wind
72th 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 15.9°C, versus 17.9°C on this specific day.
Sun & daylight
Sunrise
05:28
Sunset
20:10
Day length
14h 42m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Chicago.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 05:00 | 14.5°C | 12.5°C | 0 | 3.4 | ESE | 81 | 1023 |
| 01:00 | 06:00 | 14°C | 12.3°C | 0 | 3.1 | ESE | 84 | 1023 |
| 02:00 | 07:00 | 13.9°C | 12.2°C | 0 | 3.1 | ESE | 86 | 1023 |
| 03:00 | 08:00 | 13.7°C | 11.9°C | 0 | 3.3 | ESE | 87 | 1023 |
| 04:00 | 09:00 | 13.5°C | 11.9°C | 0.01 | 3.1 | ESE | 90 | 1023 |
| 05:00 | 10:00 | 14.5°C | 13.2°C | 0.01 | 2.7 | E | 87 | 1023 |
| 06:00 | 11:00 | 14.2°C | 12.8°C | 0 | 3 | ESE | 88 | 1023 |
| 07:00 | 12:00 | 15.1°C | 13.8°C | 0 | 3 | ESE | 85 | 1024 |
| 08:00 | 13:00 | 16.5°C | 15.3°C | 0 | 3.2 | ESE | 81 | 1024 |
| 09:00 | 14:00 | 17.9°C | 16.6°C | 0 | 3.4 | SE | 76 | 1023 |
| 10:00 | 15:00 | 19.9°C | 18.4°C | 0 | 3.9 | SE | 69 | 1023 |
| 11:00 | 16:00 | 20.9°C | 18.8°C | 0 | 4.8 | SE | 65 | 1023 |
| 12:00 | 17:00 | 21.5°C | 19.2°C | 0.01 | 5.2 | SE | 64 | 1022 |
| 13:00 | 18:00 | 21.7°C | 18.7°C | 0.08 | 6.1 | SE | 62 | 1022 |
| 14:00 | 19:00 | 21.4°C | 18.6°C | 0.03 | 6 | SE | 65 | 1022 |
| 15:00 | 20:00 | 21.7°C | 19.6°C | 0.01 | 5.3 | SE | 65 | 1021 |
| 16:00 | 21:00 | 21.1°C | 19.8°C | 0.15 | 4.5 | SE | 70 | 1021 |
| 17:00 | 22:00 | 20.2°C | 19.4°C | 0.39 | 3.7 | SE | 75 | 1021 |
| 18:00 | 23:00 | 19.8°C | 19.3°C | 0.33 | 3.4 | SE | 78 | 1021 |
| 19:00 | 00:00 | 19.4°C | 18.6°C | 0.62 | 3.9 | SE | 81 | 1021 |
| 20:00 | 01:00 | 19°C | 18.2°C | 0.59 | 3.9 | SE | 83 | 1021 |
| 21:00 | 02:00 | 18.5°C | 17.9°C | 0.83 | 3.8 | SE | 87 | 1021 |
| 22:00 | 03:00 | 18.3°C | 17.8°C | 0.66 | 3.7 | SE | 88 | 1021 |
| 23:00 | 04:00 | 18.5°C | 17.8°C | 0.46 | 4.2 | SE | 88 | 1021 |
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
- Algonquin — 42.250°, -88.250°, ERA5 grid cell center, 10.1 km from requested point
- Time zone
- America/Chicago
- What's shown here
- The hourly and daily record for 18 May 2021 specifically — not a monthly average. See the Algonquin 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 Algonquin, United States (42.25°N, 88.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Algonquin, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 18, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Algonquin, 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 Algonquin, 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.