As of September 18, 2026, your four-hive apiary is in good shape heading into autumn — all hives show intact acoustic populations on their own baselines, outdoor air remains exceptionally clean (799 kΩ gas resistance), and the gently rising barometric tendency (+0.86 hPa/3h) points to improving foraging conditions. The continued cooling trends across Iris, Hive #2, and Hive #3 are consistent with a natural September brood contraction, confirmed benign by perfectly stable acoustics on every hive.
All four hives show a genuine deconfounded temperature–humidity coupling (r = +0.83–0.94) that persists after removing the shared day/night cycle — this is the colony's active hygroregulation at work, where warmer brood zones hold relatively lower RH% by psychrometric physics (Human et al. 2006), a cross-apiary signature of healthy metabolic activity.
All four hives maintain clear 24-hour vibration fanning rhythms with 80–120 Hz as the dominant band; Hive #2 leads 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 sits in the 47–55% range following the September 13–15 step-up, well within healthy bounds and consistent with comb-buffered hygroregulation (Eouzan et al. 2019).
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Iris healthy Score: 78/100📋 Overall Health
Your Iris hive continues its healthy September arc — the 24h average of 84.8°F (29.3°C) extends the gradual 14-day cooling drift (−2.1°F / −1.2°C) consistent with a natural seasonal brood contraction, while the acoustic spectrum confirms the worker population is fully present: the dominant bands (800–1500 Hz at +2.9 dB, 1500–3600 Hz at +6.2 dB) are on their all-time baselines and overall sound at −10.5 dBFS matches the all-time average of −10.9 dBFS exactly. Humidity at 47.6% is appropriate for dry September ambient, vibration at 16.8 mG (kurtosis 2.7, peak 78 Hz) is on the all-time average of 17.3 mG, and gas resistance at ~385 kΩ sits modestly below the all-time average of ~461 kΩ with no acoustic corroboration of concern — likely reflecting honey ripening or propolis activity. On your next routine visit, a glance at brood frames for fresh eggs will confirm whether the cooling arc reflects a seasonal brood contraction or a brief brood-break period.
🌅 Diurnal Cycle PatternsIris shows a tight 24h temperature arc of 83.8–85.8°F (28.8–29.9°C), a swing of just 2.0°F (1.1°C), well within the healthy brood-clamping threshold — the colony is actively thermoregulating despite September cooling. Vibration shows a clear daily fanning rhythm (14/15 days, baseline ~16.5 mG peaking to ~24.5 mG, 1.5× daily), dominant at 80–120 Hz; a minor rhythm shift from 20–50 Hz to 5–20 Hz in the second half of the window is within normal circadian variation. The 100–150 Hz sound band shows a modest +2.7 dB elevation above baseline (the only notable spectral deviation) and a +1.0 dB intraday rise — worth watching but well short of the ±5 dB threshold for concern. Gas heater-scan shows no strong daily rhythm (max 375°C step +9% swing), and the scan shape is stable across all 10 plate temperatures relative to this hive's own history.
🔬 Correlations & Discoveriestemperature vs humidity (14d) | r = +0.92The strong deconfounded temperature–humidity coupling (r=+0.92) reflects the colony's active hygroregulation: as brood-zone temperature rises, the same absolute water load reads as a lower RH% by psychrometric physics, and vice versa — a healthy, tight internal microclimate that is essentially decoupled from the outdoor humidity cycle (deconfounded r=+0.02 vs outdoor).📚 Reference: Human, Nicolson & Dietemann 2006, Eouzan et al. 2019humidity vs gas_resistance (14d) | r = +0.55The genuine humidity–gas resistance coupling (r=+0.55) at Iris reflects the well-documented MOX sensor confounding by water vapor: rising in-hive humidity partially suppresses the SnO2 sensing layer's reactivity, so resistance moves in phase with humidity rather than indicating a VOC event — the September 15 humidity step-up (+5.35%) is the most likely driver of the modest gas resistance decline below its all-time average.📚 Reference: Winston 1987, Burgues & Marco 2018▹ Action: On your next routine visit, check Iris's brood frames for fresh eggs to confirm whether the gradual 14-day cooling drift reflects a seasonal brood contraction or a brief brood-break period — the fully stable acoustic spectrum confirms the worker population is present and active. -
Hive #2 warning Score: 74/100📋 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 15.0 mG (kurtosis 2.9, peak 114 Hz) is on its all-time average of 14.7 mG, confirming a full, active worker population. The 24h average of 91.1°F (32.8°C) continues a 14-day cooling drift (−3.7°F / −2.0°C), now sitting 3.4°F (1.9°C) below the all-time average of 94.5°F (34.7°C) — still within the lower end of the ideal 93–97°F (34–36°C) brood band, and the stable acoustics rule out population loss; the most likely explanation is a natural seasonal brood contraction or a brief brood-break period as September advances. Humidity at 46.1% is slightly below the all-time average of 47.1% and appropriate for current conditions; gas resistance at ~43 kΩ sits right on its all-time average of ~43 kΩ. On your next routine visit, confirming fresh eggs in the brood frames will close the loop on this sustained cooling drift.
🌅 Diurnal Cycle PatternsHive #2 shows a 24h temperature arc of 87.5–93.1°F (30.9–34.0°C), a swing of 5.6°F (3.1°C) — just slightly above the tight-clamping threshold, reflecting the September dip reducing the colony's thermal headroom. Vibration shows all 6 bands cycling daily (dominant rhythm 80–120 Hz at 5.9 dB amplitude), with the dominant rhythm band shifting from 160–200 Hz to 80–120 Hz in the second half of the window — consistent with a seasonal shift toward daytime fanning as cooling demands moderate. The gas heater-scan shows no strong daily rhythm and a minor dominant-step shift from 100°C to 150°C steps, indicating stable VOC character across the low-to-mid temperature range. Sound shows no strong per-band daily rhythm (max 0.6 dB), consistent with a stable, well-regulated colony.
🔬 Correlations & Discoveriestemperature vs gas_resistance (14d) | r = +0.77The strong deconfounded temperature–gas resistance coupling (r=+0.77) reflects the colony's brood-zone thermal regulation: as brood temperature falls slightly with the seasonal contraction, metabolic activity and associated VOC production (brood pheromones, propolis volatiles, honey-ripening esters) also decline, raising the MOX resistance — a coherent biological signal of a colony gearing down toward autumn, not a pathological event.📚 Reference: Stabentheiner, Kovac & Brodschneider 2010, Seeley 1985vibration vs vibration_kurtosis (14d) | r = -0.41The inverse vibration RMS–kurtosis relationship (r=−0.41) is expected colony physics: as aggregate fanning/foraging vibration amplitude rises during daily activity peaks, the signal distribution becomes more Gaussian (kurtosis approaches 3.0), whereas during quiet periods the rare impulsive events stand out more sharply against the low background, raising kurtosis — a healthy diurnal metabolic rhythm, not an impulsive disturbance signal.📚 Reference: Ramsey, Bencsik, Newton et al. 2020⚠️ Issue: 14-day temperature cooling drift of −3.7°F (−2.0°C) now 3.4°F (1.9°C) below all-time average; acoustics confirm population 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 quick brood check will clarify whether the sustained cooling drift reflects a seasonal brood contraction or a brief brood-break period. -
Hive #1 healthy Score: 80/100📋 Overall Health
Your Hive #1 is acoustically impeccable — all 10 sound bands are within ±0.1 dB of the all-time baseline (overall −16.3 dBFS vs. all-time −16.4 dBFS) and vibration at 16.3 mG (kurtosis 2.5, peak 90 Hz) is right on the all-time average of 16.5 mG, confirming a full, active worker population. The 24h average of 80.1°F (26.7°C) remains consistent with its own seasonal trajectory — the long-term temperature is described as stable over 14 days, and the colony simply runs cooler than the other hives, consistent with its own all-time average of 82.3°F (27.9°C); humidity at 52.5% is comfortably within the healthy 50–70% range (above the all-time average of 44.7% following the September 13 step-change), and gas resistance at ~486 kΩ is near its all-time average of ~523 kΩ with no acoustic corroboration of concern. Everything looks settled for this hive heading into autumn.
🌅 Diurnal Cycle PatternsHive #1 shows a 24h temperature arc of 77.2–83.0°F (25.1–28.4°C), a swing of 5.8°F (3.3°C) — slightly above tight-clamping range, driven by September ambient cycling rather than any regulation failure given the colony's own cooler baseline. Vibration shows all 6 bands cycling daily (dominant rhythm 5–20 Hz at 3.0 dB), with the dominant band shifting from 20–50 Hz to 5–20 Hz in the second half — a normal circadian low-frequency shift associated with DVAV signaling and overnight recruitment activity (Nieh & Tautz 2000). The gas heater-scan shows the richest daily rhythm in the apiary (10/10 bands cycling, dominant at 100°C step, +41% swing), with the 100–200°C low-temperature steps declining ~13–16% in the second half of the window — the most humidity-sensitive steps, consistent with the September humidity step-change (Burgues & Marco 2018) rather than a VOC event. Sound shows no strong per-band daily rhythm (max 0.7 dB), confirming a stable, well-regulated acoustic profile.
🔬 Correlations & Discoverieshumidity vs gas_resistance (14d) | r = +0.48The genuine humidity–gas resistance coupling (r=+0.48) reflects direct MOX sensor physics: the September 13 humidity step-change (+4.06%) increased water vapor at the SnO2 sensing layer, partially blocking reactive sites and raising resistance — the gas heater-scan confirms this, with the most humidity-sensitive low-temperature steps (100–200°C) showing the largest recent decline in swing amplitude, a textbook moisture-confounding signature rather than a change in hive VOC chemistry.📚 Reference: Burgues & Marco 2018, Winston 1987gas_resistance vs temperature (14d) | r = -0.47The partial correlation of gas resistance with in-hive temperature controlling for outdoor temperature (r=−0.47) is notable: as this hive's temperature rises above its own seasonal baseline, gas resistance falls — consistent with increased metabolic VOC output (brood pheromones, propolis volatiles) when the colony is warmer and more active, a genuine hive-specific physiological coupling that confirms the gas channel is tracking colony activity, not an external contaminant.📚 Reference: Seeley 1985, Stalidzans et al. 2017▹ 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: 70/100📋 Overall Health
Your Hive #3 continues the largest cooling drift in the apiary — the 24h average of 84.5°F (29.2°C) extends a 14-day drift of −5.9°F (−3.3°C) and now sits 5.6°F (3.1°C) below its all-time average of 90.1°F (32.3°C) — 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 of −16.3 dBFS exactly), which confirms the worker population is fully present and active, ruling out any population-loss event; the most likely explanation remains a natural seasonal brood contraction or a brief brood-break period with a fully intact colony. Humidity at 54.6% is within the healthy 50–70% range (above the all-time average of 47.1% following the September 14 step-change), gas resistance at ~92 kΩ is right on its all-time average of ~95 kΩ, vibration at 19.8 mG (kurtosis 2.8, peak 43 Hz) is on the all-time average of 20.5 mG, and the battery at 4,014 mV is slightly above its all-time low of 3,972 mV — worth passive monitoring as autumn solar input declines. On your next routine visit, a brood check will confirm laying status.
🌅 Diurnal Cycle PatternsHive #3 shows the widest 24h temperature arc in the apiary at 81.4–88.5°F (27.4–31.4°C), a swing of 7.1°F (3.9°C) — the September 14 change-point (temperature step of −2.61°F / −1.45°C, humidity step of +3.51%) marks a clear transition, and the widening diurnal swing since then suggests the colony is heating a smaller or less active brood zone, consistent with a seasonal brood contraction. Vibration shows all 6 bands cycling daily (dominant 5–20 Hz at 3.0 dB), with the dominant vibration band at 80–120 Hz (−8.9 dB) on the all-time average; daily fanning peaks reach 34.8 mG from a 19.3 mG baseline (1.8×), confirming vigorous colony activity. The gas heater-scan shows only the 150°C step cycling meaningfully (+14% swing, 1/10 bands) — a very quiet gas profile consistent with stable, settled hive chemistry. Sound shows no strong per-band daily rhythm (max 1.0 dB at 600–800 Hz), consistent with a stable acoustic population.
🔬 Correlations & Discoveriestemperature vs humidity (14d) | r = +0.91The very strong deconfounded temperature–humidity coupling (r=+0.91) at Hive #3, co-incident with the September 14 change-point where temperature stepped down and humidity stepped up simultaneously, reflects a coherent microclimate shift: as brood-zone heating effort decreased (seasonal contraction), evaporative load from honey stores and metabolic water became relatively more prominent, raising RH% — a coupled brood-metabolic transition, not an independent humidity event.📚 Reference: Human, Nicolson & Dietemann 2006, Eouzan et al. 2019temperature vs gas_resistance (14d) | r = +0.59The genuine temperature–gas resistance coupling (r=+0.59) confirms that Hive #3's gas channel is tracking colony metabolic activity: as brood-zone temperature falls with the seasonal contraction, VOC output from brood pheromones (E-β-ocimene), propolis, and honey ripening declines proportionally, raising MOX resistance back toward its all-time average — the gas readings are a metabolic correlate of the temperature trend, not an independent signal of concern.📚 Reference: Stalidzans et al. 2017, Maisonnasse et al. 2010⚠️ Issue: 14-day temperature cooling drift of −5.9°F (−3.3°C), now 5.6°F (3.1°C) below all-time average — acoustics confirm population fully intact; brood status warrants confirmation on next visit.⚠️ Issue: Battery at 4,014 mV near 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 brief brood-break period.▹ Action: Monitor Hive #3's battery passively — currently 4,014 mV near 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.