As of September 19, 2026, your four-hive apiary is navigating a clear September brood-contraction arc — all hives maintain perfectly stable acoustic populations on their own baselines, outdoor air is exceptionally clean (930 kΩ gas resistance), and the gently easing barometric tendency (−0.86 hPa/3h) signals a mild front moving through, consistent with the 57–72°F (13.9–22.5°C) outdoor temperature range. Hive #3 earns a 'watch' this cycle for its continued and deepening 14-day cooling drift, now the largest in the apiary at −7.7°F (−4.3°C); all other hives remain normal, with intact acoustics confirming worker populations are fully present across the board.
All four hives show a genuine deconfounded temp–humidity coupling (r=+0.84–0.92) that is hive-specific physiology, not the shared diurnal cycle — as September brood rearing contracts and fewer heater bees warm the nest, both temperature and humidity drop together, consistent with Eouzan et al. 2019's finding that brood-area RH tracks cluster metabolic activity independently of outdoor conditions.
All four hives maintain clear 24-hour vibration fanning rhythms with 80–120 Hz as the dominant band; Hive #2 continues to lead daily fanning amplitude at 3.9× baseline peaks, Hive #3 at 1.8×, and Iris and Hive #1 at ~1.5×. In-hive humidity across the apiary has settled into the 48–52% range — comfortably within healthy bounds and consistent with the September 13–15 step-up driven by comb-buffered hygroregulation (Eouzan et al. 2019).
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Iris healthy Score: 76/100📋 Overall Health
Your Iris hive is sounding its best yet — the 24h acoustic spectrum is actually slightly louder than baseline (100–150 Hz up +3.5 dB, 1500–3600 Hz up +1.4 dB, overall −10.6 dBFS vs. all-time −10.9 dBFS), confirming the worker population is fully present and active despite the continued 14-day cooling drift of −3.4°F (−1.9°C), now averaging 83.6°F (28.6°C) vs. the all-time average of 87.3°F (30.7°C). The most likely explanation remains a broodless or brood-break period — bees simply not heating a brood zone right now — with humidity at 49.3% (up from the all-time average of 41.2% following the September step-change), vibration at 17.0 mG (kurtosis 2.5, peak 61 Hz) right on its 17.2 mG all-time average, and gas resistance at ~416 kΩ modestly below the ~460 kΩ average — likely propolis or honey-ripening activity. On your next routine visit, a glance at brood frames for fresh eggs will confirm laying status.
🌅 Diurnal Cycle PatternsThe 24h temperature arc spans 82.6–84.9°F (28.1–29.4°C), a tight 2.3°F (1.3°C) swing — well within healthy brood-clamping bounds — with a smooth diurnal shape and a stable 14-of-15-day vibration fanning rhythm peaking at ~24.5 mG. A notable spectral shift is developing: the dominant acoustic daily rhythm band has migrated from 200–260 Hz to 100–150 Hz between the first and second half of the window, and the gas heater-scan dominant rhythm band shifted from 100 °C to 200 °C steps — both worth watching as passive context for the brood-break interpretation. Humidity held a flat 48.3–50.7% across the full 24h, confirming active hygroregulation (Eouzan et al. 2019).
🔬 Correlations & Discoveriestemperature_in vs humidity_in (14d) | r = +0.92The strong deconfounded temp–humidity coupling (r=+0.92) in Iris reflects genuine brood-nest physiology: as the colony contracts its heated zone during the September brood-break, both temperature and humidity fall in lockstep — fewer heater bees means less metabolic water vapor, so RH tracks cluster warmth independently of outdoor conditions. The September 15 humidity change-point (+6.37 RH step) coincides with the ongoing temperature cooling drift, consistent with a colony reducing its brood-heating footprint while the adult population remains acoustically intact.📚 Reference: Eouzan et al. 2019 (PLOS ONE / PMC6368279), Human, Nicolson & Dietemann 2006▹ Action: On your next routine visit, check Iris's brood frames for fresh eggs — the louder-than-baseline acoustic spectrum confirms the worker population is fully present, and a quick brood check will clarify whether the gradual 14-day cooling drift reflects a seasonal contraction or a brood-break period. -
Hive #2 warning Score: 72/100📋 Overall Health
Your Hive #2 remains acoustically rock-solid — all 10 sound bands are within ±0.1 dB of the all-time baseline (overall −16.5 dBFS vs. all-time −16.6 dBFS) and vibration at 16.4 mG (kurtosis 2.7, peak 36 Hz) is on its 14.8 mG all-time average, confirming a full, active worker population. The 24h average of 88.7°F (31.5°C) extends the 14-day cooling drift to −5.9°F (−3.3°C), now sitting 5.6°F (3.1°C) below the all-time average of 94.3°F (34.6°C) — a change-point was detected around September 16 (−1.68°F step) — but with perfectly stable acoustics, a broodless or brood-break period with an intact colony remains the most likely explanation; humidity at 48.2% is appropriate and gas resistance at ~46 kΩ is right on its ~43 kΩ all-time average. On your next routine visit, confirming fresh eggs will close the loop on this continued drift.
🌅 Diurnal Cycle PatternsThe 24h temperature arc spans 84.8–91.8°F (29.4–33.2°C), a 7.0°F (3.9°C) swing with a clear diurnal shape and a 14-of-15-day vibration fanning rhythm with the largest daily amplitude in the apiary (peaking at ~48.6 mG, 3.9× baseline) — the 50–80 Hz vibration band carries the strongest daily rhythm at 6.2 dB. Notably, the 120–160 Hz and 160–200 Hz vibration rhythm amplitudes are weakening over the window (8.1→4.4 dB and 7.9→4.7 dB respectively), consistent with a gradual reduction in fanning intensity as September temperatures ease. Humidity held 44.6–52.5% with an average of 48.2%, well within healthy bounds; the gas heater-scan dominant rhythm band shifted from 100 °C to 150 °C steps — a minor fingerprint change worth passive monitoring.
🔬 Correlations & Discoveriestemperature_in vs gas_resistance (14d) | r = +0.76The strong deconfounded temp–gas coupling (r=+0.76) in Hive #2 reflects a healthy colony physiology: as the brood zone cools during the September contraction, metabolic activity and fanning both decrease, reducing the circulation of hive volatiles (brood pheromones, propolis terpenes, honey esters) that drive down MOX resistance — so gas resistance and temperature rise and fall together. The stable acoustics confirm this is a brood-break metabolic shift, not a population-loss event.📚 Reference: Stalidzans et al. 2017, Seeley 1985⚠️ Issue: 14-day temperature cooling drift of −5.9°F (−3.3°C), now 5.6°F (3.1°C) below all-time average with a change-point detected ~September 16 — acoustics confirm population fully intact; brood status warrants confirmation on next visit.▹ Action: On your next routine visit, check Hive #2's brood frames for fresh eggs — the perfectly stable acoustic spectrum and on-baseline vibration confirm a full worker population, and a brood check will clarify whether the sustained cooling drift reflects a seasonal contraction or a brood-break period. -
Hive #1 healthy Score: 78/100📋 Overall Health
Your Hive #1 is acoustically impeccable — all 10 sound bands are within ±0.1 dB of the all-time baseline (overall −16.4 dBFS vs. all-time −16.4 dBFS) and vibration at 16.4 mG (kurtosis 2.7, peak 79 Hz) is right on the 16.5 mG all-time average, confirming a full, active worker population. The 24h average of 79.2°F (26.2°C) continues its modest 14-day cooling drift of −2.0°F (−1.1°C), sitting 2.8°F (1.6°C) below the all-time average of 82.0°F (27.8°C) — consistent with a natural September brood contraction — while humidity at 51.9% is now comfortably within the 50–70% healthy range (up from the 45.4% all-time average following the September 14 step-change), gas resistance at ~517 kΩ is near the ~521 kΩ all-time average, and the battery at 4,172 mV is well above its 4,122 mV all-time low. Everything looks settled heading into autumn.
🌅 Diurnal Cycle PatternsThe 24h temperature arc spans 77.1–82.2°F (25.0–27.9°C), a 5.1°F (2.8°C) swing with a clear diurnal shape and a 14-of-15-day vibration fanning rhythm (peaking at ~23.2 mG, 1.5× baseline) with the strongest daily vibration rhythm in the 5–20 Hz band (3.0 dB). The gas heater-scan shows a notable band-energy shift: the 100 °C, 150 °C, and 200 °C steps have each dropped 16–20% from the first to second half of the window while the 320 °C and 280 °C daily rhythm amplitude has weakened (+30%→+14% swing) — the shape of the curve is flattening at the low-temperature steps while the high-temperature steps hold steady, suggesting a gradual reduction in heavier/cooler volatiles (propolis terpenes, brood pheromones) consistent with the seasonal brood contraction. Humidity held a remarkably flat 51.4–52.6% all day, a textbook homeostasis signal (Eouzan et al. 2019).
🔬 Correlations & Discoverieshumidity_in vs gas_resistance (14d) | r = +0.5The deconfounded humidity–gas coupling (r=+0.50) in Hive #1 is consistent with brood-zone metabolic water: when the cluster is actively heating brood, both metabolic humidity and volatile output (brood pheromones, honey ripening esters) rise together; as the September brood contraction reduces both heating activity and brood-pheromone load, humidity and gas resistance fall in tandem. The concurrent low-temperature step weakening in the heater-scan fingerprint (100–200 °C steps −16 to −20%) supports this — the VOC profile is shifting toward lighter, more heat-stable compounds as brood pheromone production declines.📚 Reference: Winston 1987, Eouzan et al. 2019 (PLOS ONE / PMC6368279)▹ Action: On your next routine visit, confirm fresh eggs in Hive #1's brood frames — the perfectly stable acoustic spectrum and on-baseline vibration confirm the worker population is fully intact. -
Hive #3 warning Score: 68/100📋 Overall Health
Your Hive #3 continues the largest cooling drift in the apiary — the 24h average of 82.4°F (28.0°C) extends a 14-day drift of −7.7°F (−4.3°C) from 90.1°F (32.3°C), now 7.3°F (4.1°C) below its all-time average of 89.7°F (32.0°C), with a change-point detected around September 15 (−3.49°F step) — however, the acoustic spectrum is perfectly stable (all 10 bands within ±0.1 dB of baseline, overall −16.3 dBFS matching the all-time average exactly), which confirms the worker population is fully present and active, and a broodless or brood-break period with an intact colony remains the most likely explanation. Humidity at 54.0% is within the healthy 50–70% range (above the 47.6% all-time average following the September 14 step-change); gas resistance at ~97 kΩ is right on its ~95 kΩ all-time average; vibration at 20.1 mG (kurtosis 2.5, peak 40 Hz) is on the 20.5 mG all-time average; and the battery at 4,002 mV is approaching its 3,972 mV all-time low — worth passive monitoring as autumn solar input declines. On your next routine visit, a brood check will confirm laying status.
🌅 Diurnal Cycle PatternsThe 24h temperature arc spans 80.2–84.5°F (26.8–29.2°C), a 4.3°F (2.4°C) swing with a clear diurnal shape and a 14-of-15-day vibration fanning rhythm (peaking at ~35.0 mG, 1.8× baseline); the strongest vibration daily rhythm is in the 5–20 Hz band (3.0 dB) with all 6 vibration bands showing a daily cycle. The humidity anomaly z=−3.2 flags that current humidity (54.0%) sits modestly lower than the hive's own recent rhythm expects — worth noting but not alarming given it remains within the healthy 50–70% band. The gas heater-scan dominant rhythm band shifted from 150 °C to 200 °C steps between the first and second half, a minor fingerprint migration consistent with shifting VOC composition as the brood zone contracts. No meaningful daily rhythm was detected in the acoustic per-band analysis, consistent with a colony in a brood-break phase.
🔬 Correlations & Discoveriestemperature_in vs humidity_in vs gas_resistance (14d) | r = +0.91Hive #3 shows the apiary's clearest three-way deconfounded coupling (temp–humidity r=+0.91, temp–gas r=+0.55, humidity–gas r=+0.55): the September 15 temperature change-point (−3.49°F) and September 14 humidity step (+5.67 RH) together trace a colony reducing its brood-heating metabolic footprint — less heat output means less metabolic water vapor (lower RH) and less volatile circulation (higher gas resistance trending together with temperature), all while the acoustic spectrum holds perfectly steady, confirming the adult population is biologically intact and the contraction is a brood-cycle phenomenon, not a population event.📚 Reference: Eouzan et al. 2019 (PLOS ONE / PMC6368279), Stalidzans et al. 2017, Seeley 1974⚠️ Issue: 14-day temperature cooling drift of −7.7°F (−4.3°C), now 7.3°F (4.1°C) below all-time average with a change-point ~September 15 — acoustics confirm population fully intact; brood status warrants confirmation on next visit.⚠️ Issue: Battery at 4,002 mV approaching all-time low of 3,972 mV — monitor passively as autumn solar charging decreases.▹ Action: On your next routine visit, check Hive #3's brood frames for fresh eggs — the perfectly stable acoustic spectrum confirms a full worker population is present, and a brood check will clarify whether the sustained cooling drift reflects a seasonal brood contraction or a brood-break period.▹ Action: Monitor Hive #3's battery passively — currently 4,002 mV and approaching its all-time low of 3,972 mV; no action needed yet, but keep an eye on the trend over the coming weeks as autumn days shorten.