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 year

75 days with both a detection count and matching weather

a weak positive correlation (r = 0.17) Daily high temp ↔ detections

a weak negative correlation (r = -0.10) Precipitation ↔ detections

a weak negative correlation (r = -0.10) 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

2026-07-20

Drizzle · 31.1°C / 21.0°C · 2.4mm

612 det · 19 sp

2026-07-16

Dense drizzle · 31.8°C / 23.1°C · 2.4mm

517 det · 17 sp

2026-07-17

Rain · 31.6°C / 23.8°C · 7.5mm

501 det · 17 sp

2026-08-06

Dense drizzle · 31.0°C / 21.2°C · 1.6mm

479 det · 15 sp

2026-07-08

Rain · 28.5°C / 21.7°C · 6.9mm

458 det · 16 sp

Quietest days

fewest detections, with the weather that day

2026-08-28

Light drizzle · 28.8°C / 19.2°C · 0.2mm

83 det · 11 sp

2026-08-17

Rain · 28.8°C / 22.2°C · 16.4mm

94 det · 12 sp

2026-08-16

Dense drizzle · 34.1°C / 24.6°C · 4.5mm

103 det · 11 sp

2026-08-12

Rain · 26.8°C / 19.2°C · 17.9mm

127 det · 10 sp

2026-07-06

Heavy rain · 29.1°C / 20.3°C · 22.0mm

135 det · 8 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.