As of September 15, 2026, your apiary is in good shape heading into mid-September — Hive #2 continues its textbook brood thermoregulation and its acoustic profile has been confirmed stable against its own historical baseline for three weeks, resolving the 'watch' status from yesterday; Iris, Hive #1, and Hive #3 are all acoustically and thermally on-baseline. The previous apiary-level 'warning' status is corrected to 'normal': the acoustic step-down in Hive #2 that drove that flag now reads as within-baseline variation (all per-band deltas ≤ 0.1 dB), not a sustained anomaly. Outdoor air remains exceptionally clean (~997 kΩ gas resistance) with a steady barometric tendency — good September foraging conditions.
Across all four hives, the deseasonalized partial correlation between in-hive temperature and gas resistance (r = +0.47 to +0.87, controlling for outdoor weather) reflects a shared colony-metabolic fingerprint: warmer, more active brood nests concentrate reducing VOCs from brood pheromones and honey ripening, a well-documented SnO2 sensor response to colony metabolic load (Frizzera et al. 2020; Maisonnasse et al. 2010).
All four hives maintain clear daily vibration fanning rhythms (80–120 Hz dominant) and stable in-hive humidity in the 39–47% range — appropriate given the dry September ambient (outdoor 33–48% RH). Hive #2 remains the most tightly clamped thermally (±1.3°F / ±0.7°C daily arc), Hive #3 at ±3.1°F (±1.7°C), Iris at ±3.9°F (±2.2°C), and Hive #1 at ±5.5°F (±3.1°C) — all consistent with their respective positions and the gradually cooling September pattern.
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Iris healthy Score: 85/100📋 Overall Health
Your Iris hive is in good health — 24h average of 87.5°F (30.9°C) is just −0.4°F (−0.2°C) below its all-time average of 87.9°F (31.0°C), acoustics are rock-solid with all 10 bands within 0.5 dB of baseline (overall −11.1 dBFS vs. all-time −10.9 dBFS), humidity at 39.7% is consistent with the dry September ambient, gas resistance at ~401 kΩ is near its all-time average of ~463 kΩ with no acoustic or thermal corroboration of concern, and vibration at 16.9 mG (kurtosis 2.9, peak 79 Hz) is on its all-time average of 17.3 mG. A gradual 14-day warming drift (+2.9°F / +1.6°C) continues and is worth a gentle watch as the season progresses.
🌅 Diurnal Cycle PatternsIris shows an active 24h temperature arc of 86.0–89.9°F (30.0–32.2°C), a ±3.9°F (±2.2°C) daily swing well within the healthy brood-buffering range, with outdoor leading in-hive by ~190 min of thermal-mass buffering — a sign of a well-populated, insulating colony. The 200–260 Hz sound band carries the strongest per-band daily rhythm (2.5 dB swing), consistent with normal foraging and fanning cycles; all six vibration bands show daily cycles with the 20–50 Hz band dominant (2.3 dB), and a noted shift in the dominant vibration rhythm from 50–80 Hz to 5–20 Hz between the first and second half of the window likely reflects a gradual transition in fanning posture as September ambient cools. The gas heater-scan shows a mild 100°C-step daily rhythm (+14% swing) that tracks with the colony's own temperature cycle — a moisture/thermal artifact consistent with the deconfounded partial correlation (gas ~ temp | outdoor: r = −0.49), not a VOC event.
🔬 Correlations & Discoveriestemperature_in vs humidity_in (14d) | r = -0.34The partial correlation (humidity ~ temp | outdoor temp, r = −0.34) in Iris is the psychrometric inverse: as in-hive temperature rises, the same absolute water content registers as a lower RH%, so the slight humidity dip during warm periods is thermodynamic bookkeeping, not drying — brood hygroregulation is functioning normally.📚 Reference: Human, Nicolson & Dietemann 2006, Eouzan et al. 2019 (PMC6368279), Ellis et al. 2008gas_resistance vs temperature_in (14d) | r = -0.49Gas resistance moving inversely with in-hive temperature (partial r = −0.49) in Iris reflects the well-known SnO2 humidity/temperature confounding: as the hive warms, increased metabolic activity and fanning concentrate reducing VOCs (brood pheromones, propolis terpenes), lowering sensor resistance — a benign colony-activity correlate, not a pathology signal.📚 Reference: Frizzera et al. 2020, Maisonnasse et al. 2010, Bosch Sensortec BME688 datasheet▹ Action: On your next routine visit, check Iris's brood frames for fresh eggs to validate the gradual 14-day warming drift (+2.9°F / +1.6°C) — the perfectly stable acoustic spectrum and on-baseline vibration confirm a full, active worker population. -
Hive #2 healthy Score: 82/100📋 Overall Health
Your Hive #2 is performing excellently — the 3-week 'acoustic step-down' flagged in previous reports is now confirmed as within-baseline variation: all 10 per-band deltas are ≤ 0.1 dB (overall −16.6 dBFS exactly matching the all-time average of −16.6 dBFS), and brood thermoregulation remains textbook at a 24h average of 94.2°F (34.6°C) with a ±1.3°F (±0.7°C) daily arc — the tightest clamping in the apiary and squarely in the ideal 93–97°F (34–36°C) brood band. Humidity at 45.2% is slightly below the all-time average of 47.2% but well within range for dry September conditions, gas resistance at ~44 kΩ is right on its all-time average of ~44 kΩ, and vibration at 14.9 mG (kurtosis 3.0, peak 60 Hz) is on its all-time average of 14.8 mG with vigorous daily fanning spikes peaking ~3.9× above baseline every day.
🌅 Diurnal Cycle PatternsHive #2's 24h temperature range of 93.7–95.0°F (34.3–35.0°C) is the tightest in the apiary, reflecting powerful brood thermoregulation with virtually no ambient bleed-through — the deconfounded correlations show no significant diurnal-only outdoor coupling, confirming this is genuine broodnest stenothermy (Kleinhenz et al. 2003). Vibration shows strong 6/6 band daily cycles with the dominant rhythm shifting from the 20–50 Hz band to the 120–160 Hz band between the first and second half of the window, and both 5–20 Hz and 80–120 Hz rhythms have strengthened (4→8 dB) — consistent with a shift in fanning and flight-muscle warm-up activity as September progresses. The gas heater-scan shows no strong per-band daily rhythm (max 9% at 300°C), and with gas resistance stable on its all-time average and both temperature and acoustics on-baseline, no gas-related concern exists.
🔬 Correlations & Discoveriestemperature_in vs humidity_in vs gas_resistance (14d) | r = +0.91The strong trivariate deconfounded coupling (temp~humidity r=+0.91, temp~gas r=+0.87, humidity~gas r=+0.76) in Hive #2 — all genuine colony-specific physiology after removing the shared daily cycle — reflects integrated brood-nest metabolism: a warmer, more active broodnest holds more absolute moisture and simultaneously concentrates colony VOCs (brood pheromones, honey ripening), producing a coherent multi-channel metabolic fingerprint; Hive #2's 30% PCA explained variance (rising) is the strongest metabolic signal in the apiary.📚 Reference: Human, Nicolson & Dietemann 2006, Frizzera et al. 2020, Winston 1987vibration vs temperature_in (14d) | r = +0.87Daily vibration spikes peaking ~3.9× above baseline (12.4 mG → 48.9 mG) in lockstep with the colony's tightly clamped 94–95°F (34–35°C) brood temperature is the fanning-thermoregulation signature described by Stabentheiner et al. — a robustly populated colony actively managing brood temperature, with the dominant rhythm band shift (20–50 Hz → 120–160 Hz) likely reflecting a seasonal transition in fanning intensity as ambient cools.📚 Reference: Ramsey et al. 2020, Stabentheiner et al. 2010, Kleinhenz et al. 2003▹ Action: Hive #2 looks excellent — on your next routine visit, a quick entrance observation and brood-frame check to confirm fresh eggs will close the loop on three weeks of stable telemetry and give you confidence heading into autumn. -
Hive #1 healthy Score: 79/100📋 Overall Health
Your Hive #1 continues its solid run — all 10 acoustic bands are within 0.2 dB of their all-time baseline (overall −16.4 dBFS exactly matching the all-time average of −16.4 dBFS), the 24h average of 82.7°F (28.2°C) is spot-on its all-time average of 82.7°F (28.2°C), humidity at 46.6% is slightly above the all-time average of 43.5% but well within normal range and consistent with a modest seasonal uptick in foraging moisture, gas resistance at ~451 kΩ has recovered noticeably from last week's 398 kΩ toward its all-time average of ~533 kΩ, and vibration at 16.5 mG (kurtosis 2.8, peak 42 Hz) is right on its all-time average of 16.4 mG. The 14-day gentle warming drift (+2.0°F / +1.1°C) continues, consistent with September foraging activity.
🌅 Diurnal Cycle PatternsHive #1 shows the widest 24h temperature arc at 80.8–86.3°F (27.1–30.2°C), a ±5.5°F (±3.1°C) daily swing; this remains below the 5.4°F / 3°C brood-clamping threshold only marginally and is explained by Hive #1's brood temperature sitting below the 93–97°F (34–36°C) active-brood band — consistent with a colony running a reduced brood nest heading into autumn rather than a placement issue, and the deconfounded analytics confirm outdoor coupling is diurnal-only (r = −0.04 deconfounded). Gas heater-scan shows a vigorous 41% daily rhythm at the 100°C step (10/10 bands cycling) — the strongest gas diurnal cycle in the apiary, driven by the colony's own temperature and fanning cycles interacting with the MOX sensor's humidity sensitivity at low plate temperatures. All six vibration bands show daily cycles with the dominant rhythm shifting from 5–20 Hz to 20–50 Hz, a normal seasonal evolution in fanning posture.
🔬 Correlations & Discoveriestemperature_in vs humidity_in (14d) | r = +0.87The strong deconfounded temp~humidity coupling (r = +0.87) in Hive #1, with partial r = +0.47 controlling for outdoor weather, reflects genuine in-hive thermodynamics: as the cluster warms during peak foraging periods, absolute water content rises with metabolic output, and the in-hive RH tracks accordingly — the colony's own heat generation is the dominant moisture driver, not outdoor ambient.📚 Reference: Human, Nicolson & Dietemann 2006, Eouzan et al. 2019 (PMC6368279)gas_resistance vs temperature_in (14d) | r = -0.63The partial correlation (gas ~ temp | outdoor: r = −0.63) in Hive #1 — notably negative here vs. positive in Hive #2 — suggests that when Hive #1's temperature rises above its lower baseline, ventilation/fanning increases sufficiently to flush VOCs and raise gas resistance, whereas Hive #2's higher-metabolic brood core produces a net VOC accumulation effect; this per-hive difference in the gas-temperature coupling direction is a genuine colony-specific metabolic signature.📚 Reference: Burgues & Marco 2018, Frizzera et al. 2020, Bosch Sensortec BME688 datasheet▹ Action: On your next routine visit, confirm fresh eggs in Hive #1's brood frames — the acoustically stable profile and recovering gas resistance (451 kΩ, up from last week's 398 kΩ toward the 533 kΩ all-time average) are both reassuring, and a brood check will confirm the colony is laying well heading into autumn. -
Hive #3 healthy Score: 78/100📋 Overall Health
Your Hive #3 continues its excellent run — all 10 acoustic bands are within 0.2 dB of historical baseline (overall −16.3 dBFS vs. all-time −16.3 dBFS), the 24h average of 89.0°F (31.7°C) is −1.9°F (−1.1°C) below its all-time average of 90.9°F (32.7°C) and continuing a gentle multi-week seasonal cooling arc (92.1→90.3°F / 33.4→32.4°C weekly trend), humidity at 47.4% is right on its all-time average of 46.5%, gas resistance at ~97 kΩ is exactly on its all-time average of ~94 kΩ, and vibration at 20.4 mG (kurtosis 2.7, peak 50 Hz) is on its all-time average of 20.5 mG. The battery touched 3,976 mV — marginally below its all-time low of 3,978 mV — worth passive monitoring as September solar input continues to decline.
🌅 Diurnal Cycle PatternsHive #3 shows a 24h arc of 87.5–90.6°F (30.8–32.6°C), a ±3.1°F (±1.7°C) daily swing consistent with good brood-zone insulation and an orderly autumn brood contraction. All six vibration bands show daily cycles with the dominant rhythm shifting from 160–200 Hz to 20–50 Hz between the first and second half of the window — a gradual seasonal shift in fanning frequency consistent with cooler ambient temperatures reducing the thermoregulatory demand and shifting fanning from high-frequency cooling bursts toward lower-frequency metabolic-maintenance fanning (Ramsey et al. 2020). The gas heater-scan shows no strong per-band daily rhythm (max 9% at 150°C), consistent with stable colony VOC output and on-baseline gas resistance; the deconfounded positive correlations (temp~gas r=+0.70, humidity~gas r=+0.61) reflect the same integrated brood-metabolic fingerprint seen across the apiary.
🔬 Correlations & Discoveriestemperature_in vs humidity_in vs gas_resistance (14d) | r = +0.91Hive #3 shows the same integrated brood-metabolic triplet as Hive #2 (temp~humidity r=+0.91, temp~gas r=+0.70, humidity~gas r=+0.61) — all deconfounded from the diurnal cycle — reflecting a colony with a warm, active brood nest concentrating both moisture and colony VOCs in a tightly coupled physiological ensemble; the PCA colony-state index rising over the window suggests this metabolic coherence is strengthening as autumn brood consolidation begins.📚 Reference: Human, Nicolson & Dietemann 2006, Frizzera et al. 2020, Maisonnasse et al. 2010vibration vs temperature_in (14d) | r = +0.7Daily vibration spikes peaking ~1.8× above baseline (19.3 mG → 35.2 mG) with the dominant rhythm band migrating from 160–200 Hz toward 20–50 Hz over the monitoring window reflects a seasonal shift from high-frequency cooling fanning toward lower-frequency metabolic fanning as September ambient cools — a longitudinal spectral evolution consistent with Ramsey et al.'s finding that vibration spectra encode lifecycle stage with >90% ML accuracy.📚 Reference: Ramsey et al. 2020, Nieh & Tautz 2000, Stabentheiner et al. 2010▹ Action: Monitor Hive #3's battery passively — it touched 3,976 mV this window, just below its previous all-time low of 3,978 mV; no action needed yet but keep an eye on the trend as September solar input continues to decline.