AI Beehive Health Report — 2026-09-21

Multi-sensor colony health analysis · 2026-09-21 warning
🐝 Apiary Overview

As of September 21, 2026, all four colonies are acoustically rock-solid on their own baselines — worker populations fully intact across the board — while continuing a textbook September brood-contraction arc; the previous 'warning' status is downgraded to 'watch' as the cooling drifts remain acoustically uncorroborated and are consistent with seasonal brood-break biology rather than colony distress. The outdoor air is exceptionally clean (1,663 kΩ gas resistance), the barometric tendency is gently rising (+0.51 hPa/3h), and the 53–77°F (11.9–25.2°C) outdoor range is well within normal late-September foraging conditions.

🔬 Featured Apiary Correlation

Across all four Apimaye R≈6.93 hives, the deseasonalized in-hive temperature–humidity coupling (r = +0.65 to +0.89) reflects the well-established psychrometric relationship: as brood rearing winds down and cluster mass contracts, both temperature and absolute moisture load fall together, naturally lifting RH% from the step-change seen around September 14–15 — a metabolic signature of the seasonal brood-break transition, not a ventilation anomaly (Eouzan et al. 2019; Human et al. 2006).

🌅 Featured Apiary Diurnal Patterns

All four hives maintain clear daily vibration fanning rhythms with 80–120 Hz dominant; Hive #2 leads daily fanning amplitude at ~3.8× baseline, Hive #3 at ~1.8×, and Iris and Hive #1 at ~1.5× — a healthy September foraging cadence consistent with the outdoor temperature window. In-hive humidity is settled in the 49–55% range across the apiary following the September 14–15 psychrometric step-change, comfortably within healthy bounds and consistent with reduced brood-water demand in a brood-break state.

📋 Per-Hive Analysis
  • Iris healthy Score: 78/100
    📋 Overall Health

    Your Iris hive continues to sound excellent — the 24h acoustic average of −10.7 dBFS is right on its all-time −10.8 dB baseline with all 10 bands within ±2.6 dB (the 100–150 Hz band is the largest shift at +2.6 dB, well within casual variation), confirming the worker population is fully present and active despite the 14-day cooling drift of −8.9°F (−5.0°C), now averaging 80.9°F (27.2°C) vs. the all-time average of 86.8°F (30.4°C). Humidity at 50.1% sits comfortably in the healthy 50–70% range, gas resistance at ~436 kΩ is near the ~454 kΩ all-time average indicating a clean environment, and vibration at 17.3 mG (kurtosis 2.5, peak 31 Hz, dominant band 80–120 Hz) is right on the 17.2 mG all-time average — everything points to a colony in a natural seasonal brood-break with its population fully intact; confirm laying status on your next routine visit.

    🌅 Diurnal Cycle Patterns

    Iris shows a well-defined 24h temperature cycle averaging +5.3°F (+3.0°C) peak-to-trough, with all 14 of 15 days showing a clear vibration fanning peak (typical ~16.5 mG baseline rising to ~24.5 mG, avg 1.5×); the dominant vibration rhythm has shifted from 5–20 Hz to the low end in recent days with a weakening DVAV-band rhythm (3.0 dB → 1.0 dB in 5–20 Hz), consistent with reduced foraging-preparation signaling as September brood rearing winds down. The gas heater-scan shows a modest low-temperature step decline (100°C −14%, 150°C −12%, 200°C −11%) tracking the humidity step-change from September 15 — the lower plate-temperature steps are the most humidity-sensitive and this shape shift is a moisture/psychrometric artifact rather than a new VOC source, confirmed by the stable 350–400°C reference steps. Humidity is narrow and stable at 49–51.5% across the day, decoupled from the outdoor 26–57% swing — healthy hygroregulation.

    🔬 Correlations & Discoveries
    temperature_in vs humidity_in (14d) | r = +0.89
    The strong deseasonalized in-hive temperature–humidity coupling (r = +0.89) in Iris reflects the psychrometric reality of a contracting brood cluster: as fewer larvae demand heating and nurse-bee metabolic water output falls, both temperature and absolute humidity decline in lockstep, while RH% actually rose after the September 15 step-change — a textbook brood-break humidity signature, not a ventilation fault.
    📚 Reference: Eouzan et al. 2019 (PMC6368279), Human, Nicolson & Dietemann 2006
    humidity_in vs gas_resistance (14d) | r = +0.43
    The modest positive humidity–gas-resistance correlation (r = +0.43) in Iris is consistent with reduced fanning effort as brood rearing contracts: less active ventilation means slightly less VOC throughput and a marginally higher resistance reading when humidity is also higher — both channels moving together as colony metabolic rate declines seasonally, not a fermentation or disease signal.
    📚 Reference: Burgues & Marco 2018, Sensors 18(2):339, Winston 1987
    ⚠️ Issue: 14-day temperature cooling drift of −8.9°F (−5.0°C) from 89.9°F (32.1°C) to 80.9°F (27.2°C) — acoustics confirm population fully intact; brood status warrants confirmation on next routine visit.
    ▹ Action: On your next routine visit, glance at Iris's brood frames for fresh eggs — the stable acoustic spectrum and on-baseline vibration confirm the worker population is fully present, and a quick brood check will confirm whether this drift reflects seasonal contraction or a brood-break interval.
  • Hive #2 warning Score: 70/100
    📋 Overall Health

    Your Hive #2 remains acoustically rock-solid — all 10 sound bands within ±1.8 dB of the all-time baseline (overall −16.4 dBFS vs. all-time −16.5 dBFS) — confirming the worker population is fully intact, but the 14-day cooling drift has now deepened to −20.2°F (−11.2°C), with the 24h average reaching 74.8°F (23.8°C), fully 18.5°F (10.3°C) below the all-time average of 93.3°F (34.0°C); this is the largest drift in the apiary and the colony's prior brood-core temperature of ~93–96°F (34–35°C) has not been held for several days. Humidity at 54.3% is healthy and appropriate for a brood-break state, gas resistance at ~43 kΩ remains near its own all-time average of ~44 kΩ (this hive has a characteristically lower baseline than its neighbors, consistent with its individual MOX calibration), and vibration at 25.4 mG (kurtosis 3.3, peak 45 Hz) is above the 15.2 mG all-time average driven by robust daily fanning peaks averaging 3.8× baseline — all signs of an active, present colony in a brood-break or natural autumn contraction; confirm queen and brood status on your next visit.

    🌅 Diurnal Cycle Patterns

    Hive #2 shows the widest 24h temperature swing in the apiary at +13.8°F (+7.6°C) average, with a diurnal arc from 66.9°F (19.4°C) to 87.3°F (30.7°C) — tracking ambient more closely than when brood was being actively heated, consistent with reduced thermal buffering in a brood-break state on a screened-floor hive. All 6 vibration bands show a clear daily cycle, with the dominant fanning rhythm shifting from 120–160 Hz to 160–200 Hz over the monitoring window and both 5–20 Hz and 120–160 Hz fanning rhythms weakening slightly — consistent with a seasonal wind-down of foraging-preparation vibrations. The gas heater-scan shows a notable low-temperature step gain (100°C +18%, 150°C +18%, 200°C +15%) since the September 18 gas change-point, which tracks the simultaneous humidity rise (r = +0.53 deseasonalized) — the low-temperature MOX steps are most humidity-sensitive, and this shape shift is a moisture/psychrometric effect coinciding with the September brood-break transition rather than a new VOC chemistry event; the high-temperature reference steps (350–400°C) are stable, confirming no major reducing-gas increase. Vibration second-half-of-day bands trending down 2.1–2.3 dB is consistent with normal end-of-foraging-window activity decline.

    🔬 Correlations & Discoveries
    temperature_in vs humidity_in (14d) | r = +0.73
    The deseasonalized temperature–humidity coupling (r = +0.73) in Hive #2 reflects the brood-break metabolic contraction: as the colony ceased heating a full brood nest around September 17 (change-point −4.84°F step), metabolic water production declined in parallel with temperature, both channels falling together — a seasonal biological state change fully consistent with intact-population acoustics.
    📚 Reference: Eouzan et al. 2019 (PMC6368279), Human, Nicolson & Dietemann 2006
    humidity_in vs gas_resistance (14d) | r = +0.53
    The positive humidity–gas-resistance correlation (r = +0.53, partial r = −0.83 controlling for outdoor temp) in Hive #2 captures the MOX sensor's well-documented humidity sensitivity: the low-temperature heater-scan steps (100–200°C) are particularly water-vapor-reactive, so the September 18 gas step-change coinciding with rising humidity is most parsimoniously explained as a psychrometric artifact of the brood-break humidity transition rather than new colony VOC chemistry.
    📚 Reference: Abidin et al. 2022, Sensors 22:3301, Burgues & Marco 2018
    vibration_rms vs vibration_kurtosis (14d) | r = -0.45
    The negative vibration–kurtosis correlation (r = −0.45) in Hive #2 is a healthy signature: higher overall vibration amplitude corresponds to lower kurtosis (smoother, more continuous activity), consistent with sustained coordinated fanning bouts rather than impulsive disturbance events — the colony's 3.8× daily fanning peaks are distributed, rhythmic effort, not impact events.
    📚 Reference: Ramsey et al. 2020, Sci. Rep. 10:9798, Nieh & Tautz 2000
    ⚠️ Issue: 14-day temperature cooling drift of −20.2°F (−11.2°C), now 18.5°F (10.3°C) below all-time average — the largest drift in the apiary; acoustics confirm the population is fully intact, but brood/queen status warrants confirmation on your next visit.
    ▹ Action: On your next routine visit, check Hive #2's brood frames for fresh eggs and confirm queen status — the perfectly stable acoustic spectrum confirms a full worker population is present, and a brood check will clarify whether this sustained cooling drift reflects a brood-break interval or the colony has been queenless for a period.
  • Hive #1 healthy Score: 80/100
    📋 Overall Health

    Your Hive #1 is acoustically impeccable — all 10 sound bands within ±0.1 dB of the all-time baseline (overall −16.4 dBFS, exactly matching the all-time −16.4 dBFS average) and vibration at 16.4 mG (kurtosis 2.8, peak 90 Hz, dominant band 80–120 Hz) sits right on the 16.5 mG all-time average, confirming a full, active worker population. The 24h average of 78.4°F (25.8°C) continues a modest 14-day cooling drift of −6.0°F (−3.3°C), sitting 3.1°F (1.7°C) below the all-time average of 81.5°F (27.5°C) — well within seasonal brood-contraction expectations — while humidity at 49.3% is in healthy bounds (up from the 46.4% all-time average following the September 14 step-change), gas resistance at ~489 kΩ remains above its ~519 kΩ all-time average indicating a clean, low-VOC environment, and the battery at 4,184 mV is comfortably above its 4,122 mV all-time low; everything looks settled heading into autumn.

    🌅 Diurnal Cycle Patterns

    Hive #1 shows a well-behaved 24h temperature cycle averaging +6.2°F (+3.4°C) peak-to-trough, with 14 of 15 days showing a clear vibration fanning peak (typical ~15.8 mG baseline rising to ~23.3 mG, avg 1.5×); the dominant vibration rhythm has shifted from 20–50 Hz to 5–20 Hz over the monitoring window — a subtle DVAV-band drift consistent with reduced foraging-preparation signaling in September. The gas heater-scan is notably active with all 10 steps showing a daily cycle (strongest at 100°C, +30% swing), but the dominant rhythm band shifted from 200°C to 100°C and the mid-step rhythms are weakening (200°C: +41% → +19%, 300°C: +30% → +14%) — the lower, more humidity-sensitive steps are gaining relative dominance as the psychrometric environment shifts post-brood-break, consistent with the September 14 humidity step-change. Humidity is extremely stable at 48.9–50.3% across the day, well-decoupled from outdoor swings — healthy hygroregulation for an active colony in late September.

    🔬 Correlations & Discoveries
    temperature_in vs humidity_in (14d) | r = +0.83
    The strong deseasonalized temperature–humidity coupling (r = +0.83) in Hive #1 reflects the same September brood-break metabolic contraction seen across the apiary: declining brood mass means less metabolic water production and less heat generation simultaneously, while the colony's hygroregulation maintains humidity within a tight 48.9–50.3% band — a sign of active regulation with a contracting cluster, not a ventilation anomaly.
    📚 Reference: Eouzan et al. 2019 (PMC6368279), Human, Nicolson & Dietemann 2006
    humidity_in vs gas_resistance (14d) | r = +0.51
    The positive humidity–gas-resistance coupling (r = +0.51) in Hive #1 is dominated by the low-temperature MOX plate steps (100–200°C showing the strongest daily rhythms and a 100°C band-energy decline of −12%), consistent with water-vapor sensitivity at lower plate temperatures; the high-temperature reference steps remain stable, confirming this is a moisture-mediated shape shift in the heater scan rather than a genuine VOC chemistry change.
    📚 Reference: Abidin et al. 2022, Sensors 22:3301, Burgues & Marco 2018
    ▹ 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, and this is the mildest cooling drift in the apiary at −6.0°F (−3.3°C) over 14 days.
  • Hive #3 warning Score: 72/100
    📋 Overall Health

    Your Hive #3 continues a 14-day cooling drift of −12.2°F (−6.8°C), with the 24h average at 79.2°F (26.2°C), now 9.3°F (5.2°C) below its all-time average of 88.5°F (31.4°C) — but crucially, the acoustic spectrum is stable and slightly louder than baseline (+2.1 dB in the 500–600 Hz band, all others within ±0.5 dB, overall −16.1 dBFS vs. −16.3 dBFS all-time average), which confirms the worker population is fully present and active; this is a broodless or brood-break state with an intact colony, not a swarm event. Humidity at 55.2% (range 42.5–66.9%) is within healthy bounds, gas resistance at ~96 kΩ is right on its own ~95 kΩ all-time average (a September 19 change-point of −9,597 Ω is modest and near-baseline), vibration at 19.9 mG (kurtosis 2.8, peak 51 Hz, dominant band 80–120 Hz) is near the 20.4 mG all-time average, and the battery at 4,002 mV is monitoring territory — it touched its all-time low of 3,972 mV intra-day and warrants passive watching as autumn solar input declines.

    🌅 Diurnal Cycle Patterns

    Hive #3 shows the widest 24h humidity swing in the apiary (42.5–66.9%) and a 9.5°F (5.3°C) average temperature swing, both reflecting the screened-floor ventilation coupling ambient more directly during this brood-break phase — the in-hive humidity partially tracks the outdoor 26–57% range, consistent with reduced brood-zone buffering. All 6 vibration bands show a clear daily cycle with 80–120 Hz as the dominant fanning rhythm (2.5 dB strength), and 14 of 15 days show a distinct fanning peak (~19.2 mG baseline rising to ~35.0 mG, avg 1.8×). The gas heater-scan shows a strengthening 100°C daily rhythm (+9% → +24% swing) with a band shift from 150°C to 100°C dominant — the most humidity-sensitive low-temperature step gaining rhythm strength tracks the wider humidity swings in this hive, a moisture-driven MOX shape shift rather than a new chemical event; the 350–400°C reference steps are stable. The 500–600 Hz sound band (+2.1 dB vs. baseline) trended down −3.6 dB in the second half of the day — a single-band, single-session shift within the natural foraging-window decline, not a persistent anomaly.

    🔬 Correlations & Discoveries
    temperature_in vs humidity_in (14d) | r = +0.65
    The deseasonalized temperature–humidity coupling (r = +0.65) in Hive #3 is the weakest of the four hives, likely because the screened floor on this four-box stack allows more direct ambient ventilation, partially decoupling internal humidity from colony metabolic output — the wider 42.5–66.9% daily RH swing reflects ambient air throughput rather than a colony regulatory failure (Mitchell 2016; Eouzan et al. 2019).
    📚 Reference: Eouzan et al. 2019 (PMC6368279), Human, Nicolson & Dietemann 2006
    gas_resistance vs change_point_2026-09-19 (14d) | r = -0.41
    The September 19 gas change-point (−9,597 Ω step) in Hive #3 is modest relative to the ~95 kΩ all-time baseline (~10% shift) and coincides with the widening humidity swings from the brood-break transition; given stable acoustics and temperature remaining above colony-silence levels, the most parsimonious explanation is a humidity-mediated MOX baseline shift during the ventilation-coupled brood-break phase rather than a new VOC source — worth noting but not actionable on its own.
    📚 Reference: Abidin et al. 2022, Sensors 22:3301, Stalidzans et al. 2017
    ⚠️ Issue: 14-day temperature cooling drift of −12.2°F (−6.8°C) from 91.4°F (33.0°C) to 79.2°F (26.2°C), with change-point ~September 15 — acoustics confirm the population is fully intact; brood/queen status warrants confirmation on next routine visit.
    ⚠️ Issue: Battery reached its all-time low of 3,972 mV intra-day (currently 4,002 mV) — monitor passively as autumn solar charging decreases.
    ▹ Action: On your next routine visit, check Hive #3's brood frames for fresh eggs — the stable and slightly louder acoustic spectrum confirms a full worker population is present, and a brood check will clarify whether the sustained cooling drift reflects seasonal contraction or a brood-break interval.
    ▹ Action: Monitor Hive #3's battery passively — it touched its all-time low of 3,972 mV intra-day; no action needed yet, but keep an eye on the trend over the coming weeks as autumn days shorten.