Meteorology · activity vs. conditions

Does the weather actually move the needle?

Daily detection totals from Birdramon, lined up against day-resolution historical weather for the station's location — via Open-Meteo's free, no-key historical archive (ERA5 reanalysis). No account, no subscription tier.

last 30 days last 90 days last 180 days last year

Correlation, last 30 days

30 days with both a detection count and matching weather

a weak negative correlation (r = -0.27) Daily high temp ↔ detections

a moderate negative correlation (r = -0.39) Precipitation ↔ detections

a fairly strong negative correlation (r = -0.65) Peak wind ↔ detections

A rough read, not a study: Pearson's r across whichever days in this window have both a detection count and weather on file. Small windows (30 days) can swing around on a couple of unusual days — the longer windows are the more trustworthy read on the actual pattern.

Activity vs. conditions

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High temp Precipitation Peak wind

Busiest days

most detections, with the weather that day

2026-10-21

Clear sky · 22.0°C / 5.1°C

747 det · 19 sp

2026-10-19

Clear sky · 20.3°C / 3.4°C

590 det · 20 sp

2026-10-22

Clear sky · 21.6°C / 6.4°C

546 det · 23 sp

2026-10-24

Overcast · 22.3°C / 6.6°C

526 det · 25 sp

2026-10-23

Clear sky · 21.6°C / 6.4°C

517 det · 23 sp

Quietest days

fewest detections, with the weather that day

2026-10-15

Rain · 26.5°C / 19.8°C · 16.8mm

61 det · 8 sp

2026-10-12

Overcast · 27.7°C / 12.4°C

62 det · 7 sp

2026-10-16

Dense drizzle · 24.0°C / 10.2°C · 6.4mm

98 det · 8 sp

2026-10-03

Overcast · 22.5°C / 12.5°C

108 det · 7 sp

2026-10-10

Drizzle · 19.1°C / 14.8°C · 1.9mm

108 det · 11 sp

Heads up: Open-Meteo's historical archive lags a handful of days behind "now" (it's reanalysis data, not live observations), so the most recent few days in this window may not have a weather row yet — that's expected, not a bug.