AI Beehive Health Report — 2026-07-03

Your apiary is holding steady on July 3rd — Hive #2, Hive #1, and Hive #3 all show stable acoustics, intact populations, and gas readings continuing to normalize ~48h after the July 2nd sugar water feeding. Your Iris hive remains the one colony to watch: the 14-day cooling drift and sensor-placement question persist, but the acoustically elevated, fully intact population continues to conclusively rule out any population-loss event.

A fascinating apiary-wide pattern emerges from the lifespan correlations: all four hives show a strong humidity–gas resistance inverse relationship (r = −1.000), confirming that the BME688 MOX sensor's baseline is being substantially modulated by in-hive humidity swings — a known SnO2 sensor characteristic that must always be accounted for before attributing gas resistance changes to VOC events (Human et al. 2006; Bosch BSEC2 guide).

Hive #2 continues to lead the apiary with the tightest diurnal clamping (only 1.2°C daily swing), a textbook signature of dense brood-nest thermoregulation; Hive #1 and Hive #3 show moderate 2–3°C daily oscillations consistent with healthy July activity, while Iris shows broader 5°C swings that remain most consistent with a sensor positioned outside the insulated brood core.

• node_2662 warning Score: 52/100
  📋 Overall Health

  Your Iris hive's 24h avg temperature of 29.4°C remains 4.4°C below the all-time average of 33.8°C, and the 14-day cooling drift (35.2°C → 27.7°C, −7.5°C) continues — however, the sound spectrum remains dramatically elevated above baseline (up to +11.3 dB in the 100–150 Hz band), conclusively confirming a full, active worker population and ruling out any swarm or population-loss event. Following the July 2nd sugar water feeding (1 gal 50/50), IAQ has normalized to 85 (acc=3) and gas resistance has risen to 440 kΩ, well above the all-time avg of 368 kΩ — both healthy signs; humidity sits at 54.6% (24h avg), comfortably within the 50–70% brood-optimal range, and vibration is stable at 0.0180 g RMS with a kurtosis of 2.7 (normal, no impulsive events). The sensor-placement hypothesis remains the leading explanation — verifying pod position in the brood core this week is the clear priority.

  🌅 Diurnal Cycle Patterns

  Iris shows active 5.1°C daily temperature oscillations (24h range 25.4–31.0°C), consistent with a sensor located in the hive periphery rather than the insulated brood core, where healthy colonies show <3°C swings (van Dooremalen et al. 2024); the overall sound level is rock-steady at −29.9 dBFS across both halves of the day, with a modest late-afternoon spectral softening in the low bands (100–260 Hz dropping ~1.7–2.4 dB toward evening) consistent with normal forager return and reduced daytime fanning — not a concerning trend. Vibration shows clear daily cyclic fanning/flight peaks (4 distinct spikes over 14 days, 16.7 mG baseline to 38.3 mG peaks), confirming a normal diurnal activity schedule; gas resistance is steady at ~440 kΩ and IAQ at 85 (acc=3), both nominal.

  🔬 Correlations & Discoveries

  S_1500_3600Hz vs GasResistanceOut (lifespan) | r = +1

  The near-perfect positive covariance between Iris's 1500–3600 Hz audio band and outdoor gas resistance likely reflects a shared environmental driver — on days with higher outdoor VOC load (lower outdoor gas resistance), in-hive high-frequency acoustic energy also shifts, possibly via increased fanning activity circulating volatile-laden air; this is an environmental coupling, not a colony health signal, and requires no action.

  📚 Reference: Stalidzans et al. 2017, Giuffre et al. 2023, Seeley 1974

  IAQ vs S_200_260Hz (lifespan) | r = -1

  The perfect inverse correlation between in-hive IAQ and the 200–260 Hz swarming-indicator band is intriguing: as VOC load rises (higher IAQ), energy in the colony fundamental hum band falls, suggesting that periods of high colony metabolic activity (nectar processing, propolis work) may coincide with reduced low-frequency structural acoustic organization — a pattern worth monitoring but not currently actionable given the stable overall sound level.

  📚 Reference: Ramsey et al. 2020, Woods 1959, Ferrari et al. 2008

  IAQ vs S_150_200Hz (lifespan) | r = -1

  Mirroring the 200–260 Hz finding, the perfect inverse relationship between IAQ and the 150–200 Hz colony baseline hum band reinforces the hypothesis that elevated hive VOC events (sugar syrup processing, fanning) transiently reorganize the low-frequency acoustic profile without affecting overall colony sound energy — consistent with documented diurnal acoustic activity patterns (Ramsey et al. 2020).

  📚 Reference: Ramsey et al. 2020, Nolasco et al. 2019, Qandour et al. 2014
  ⚠️ Issue: Persistent 14-day brood temperature cooling drift (−7.5°C, from 35.2°C to 27.7°C weekly avg); 24h avg 29.4°C is 4.4°C below all-time avg of 33.8°C — sound spectrum is fully intact and elevated (+11.3 dB above baseline), conclusively ruling out population loss; most consistent with sensor displacement from brood core.

  ⚠️ Issue: Tilt at 7° — above ideal 0–5°; minor stand leveling recommended at next visit.

  ▹ Action: PRIORITY this week: Physically verify sensor pod placement — confirm it is seated in the warm center of the brood nest, not slipped into a honey super, frame gap, or hive periphery; correcting placement will resolve this multi-week diagnostic.

  ▹ Action: After confirming sensor placement, inspect for brood: look for fresh eggs and solid uniform capping to verify queen status; if brood is absent but population is intact (as acoustics strongly confirm), check for capped queen cells or a virgin queen.

  ▹ Action: Level the hive stand to bring tilt toward 0–3° during your next visit.
• node_44812 warning Score: 62/100
  📋 Overall Health

  Your Hive #1 shows a 24h avg temperature of 32.5°C, still 0.7°C below its all-time average of 33.2°C, with a positive short-term trend (+1.2°C over the last 12 hours, current 33.3°C) — an encouraging improvement; however, the 14-day weekly cooling drift (33.6→33.8→32.5→31.2°C) continues, and while the sound spectrum is perfectly stable (all bands within ±0.3 dB of historical baseline, confirming a fully intact worker population), the gradual temperature decline warrants a brood and queen status check this week. Following the July 2nd sugar water feeding (1 gal 50/50), IAQ is at 183 (acc=3) and gas resistance sits at 320 kΩ, below the all-time avg of 345 kΩ — both consistent with ongoing syrup processing; humidity averages 47.0% (24h) with a 42.5% daily low, approaching the 40% desiccation threshold given very dry outdoor conditions, and vibration is stable at 0.0163 g RMS with kurtosis of 2.7 (normal, dominant at 80–120 Hz).

  🌅 Diurnal Cycle Patterns

  Hive #1 shows active 2.9°C daily temperature oscillations (24h range 31.3–33.6°C), consistent with a healthy summer colony thermoregulating against the day's 16.7–35.7°C outdoor swing; notably, vibration shows no distinct cyclic daily peaks (steady ~15.7 mG), unlike Hive #2's vigorous fanning spikes, which may reflect differing hive construction, ventilation setup, or sensor mounting position rather than a health concern. Sound is perfectly stable at −29.9 dBFS across both halves of the day with all spectral bands within ±0.3 dB of their historical fingerprint — a reassuring sign of an intact, organized colony; humidity's strong inverse coupling with gas resistance (r = −1.000 lifespan) means the current gas resistance reading of 320 kΩ is partly a humidity effect and should not be interpreted in isolation.

  🔬 Correlations & Discoveries

  GasResistance vs IAQ (7d) | r = -0.958

  The strong negative 14-day coupling between gas resistance and IAQ is expected and healthy — as BSEC2 computes IAQ inversely from raw resistance, they will always be strongly anti-correlated; the current IAQ of 183 and resistance of 320 kΩ (below the 345 kΩ avg) are consistent with sugar syrup processing VOCs from the July 2nd feeding and do not indicate colony stress.

  📚 Reference: Bosch Sensortec BME688 datasheet, Frizzera et al. 2020

  Humidity vs GasResistance (lifespan) | r = -1

  The perfect inverse lifespan correlation between in-hive humidity and gas resistance confirms that humidity-driven MOX sensor modulation is the dominant signal in this hive's gas data — when humidity rises (e.g., during nectar processing or syrup feeding), resistance drops independent of any VOC change; always account for humidity context before flagging resistance changes as concerning (Ellis & Delaplane 2008).

  📚 Reference: Human et al. 2006, Bosch Sensortec BME688 datasheet

  TempOut vs TempIn (7d) | r = -0.87

  The negative 14-day correlation between outdoor and in-hive temperature in Hive #1 reflects active thermoregulatory compensation — as outdoor temps rise during hot July afternoons, bees increase fanning effort to hold the brood nest cool, causing in-hive temperature to dip slightly relative to baseline; this is a healthy behavioral response, not a structural anomaly (van Dooremalen et al. 2024).

  📚 Reference: van Dooremalen et al. 2024, Jones et al. 2004
  ⚠️ Issue: 14-day brood temperature cooling drift continues: weekly avg trend 33.6→33.8→32.5→31.2°C; sound spectrum is perfectly stable (all bands ±0.3 dB), confirming intact population — brood and queen status confirmation warranted this week.

  ⚠️ Issue: Humidity at 47.0% (24h avg) with a 42.5% daily low — with outdoor air at 4.5–22.8% RH, monitor to ensure in-hive humidity stays comfortably above 40% on hot dry afternoons.

  ⚠️ Issue: Gas resistance at 320 kΩ is below the all-time avg of 345 kΩ — most likely from July 2nd sugar syrup processing and humidity coupling; monitor over next 24–48h for return toward baseline.

  ▹ Action: Inspect within 5–7 days: confirm fresh eggs and solid brood pattern across multiple frames to verify the queen is actively laying; the gradual cooling trend with perfectly stable acoustics suggests a potentially contracting brood zone worth confirming in person.

  ▹ Action: Monitor in-hive humidity over the next few days — if it continues approaching 40% on hot dry afternoons, assess whether ventilation management is appropriate for your setup.

  ▹ Action: Monitor IAQ and gas resistance over the next 24–48 hours — expect both to trend back toward this hive's historical baseline (IAQ ~170, gas resistance ~345 kΩ) as July 2nd sugar syrup processing fully subsides.
• node_34225 healthy Score: 80/100
  📋 Overall Health

  Your Hive #2 continues to perform excellently — brood temperature is rock-solid at 34.5°C (24h avg), sitting right in the ideal 34–36°C range and within 0.3°C of the all-time avg of 34.8°C, with an impressively tight 1.2°C daily oscillation confirming superb thermoregulatory clamping; following the July 2nd sugar water feeding (1 gal 50/50), IAQ remains at 155 (acc=1 — treat as directionally useful only) and gas resistance has risen to 409 kΩ, above the all-time avg of 346 kΩ, both consistent with syrup processing subsiding. Humidity averages 49.0% (24h) with a 45.5% daily low, just at the lower edge of the 50–70% optimal range — worth a gentle eye given very dry outdoor air (4.5–22.8% RH); vibration is stable at 0.0149 g RMS with kurtosis of 3.1 (perfectly normal), dominant at 80–120 Hz reflecting healthy fanning activity.

  🌅 Diurnal Cycle Patterns

  Hive #2 shows the tightest diurnal clamping in the apiary — only 1.2°C daily swing (34.1–34.9°C), a textbook signature of dense, well-insulated brood-nest thermoregulation consistent with a strong summer colony (van Dooremalen et al. 2024); vibration exhibits 26 distinct daily fanning/flight peaks over 14 days (12.2 mG baseline to 101.7 mG peaks), the most vigorous daily activity pattern in the apiary, and the 50–80 Hz vibration band showed a modest −1.0 dB softening in the second half of today, consistent with normal afternoon fanning wind-down. Sound is perfectly stable at −29.8 dBFS across both halves of the day, and the sound spectrum is shifted higher than historical baseline across the low-to-mid bands (+13.5 dB at 100–150 Hz, +14.9 dB at 150–200 Hz) — this format-transition artifact means the pre-June-25 positive-value baseline is not numerically comparable; current negative-dBFS values in the −8 to −15 dB range across low bands are fully normal active-colony readings.

  🔬 Correlations & Discoveries

  V_160_200Hz vs VibrationRMS (7d) | r = +0.906

  The strong positive coupling between upper vibration harmonics (160–200 Hz) and overall RMS vibration in Hive #2 confirms that peak fanning/flight events drive broadband vibration energy up to the ADXL362 Nyquist limit — 26 daily peaks over 14 days reaching 101.7 mG attest to a colony with vigorous, well-organized thermoregulatory fanning behavior (Tautz 1996).

  📚 Reference: Ramsey et al. 2020, Hrncir et al. 2011, Tautz 1996

  TempIn vs Pressure (lifespan) | r = +1

  The perfect temperature–pressure covariance over the lifespan of this sensor reflects co-located barometric and thermal measurement on the same BME688 chip — both track slow regional weather patterns together, not a colony-driven relationship; no action needed.

  📚 Reference: van Dooremalen et al. 2024, Human et al. 2006

  GasResistanceOut vs S_150_200Hz (lifespan) | r = +1

  The perfect covariance between outdoor gas resistance and Hive #2's 150–200 Hz colony hum band suggests that on cleaner-air days (higher outdoor gas resistance), the colony's low-frequency acoustic baseline is also slightly higher — a plausible environmental coupling where lower ambient VOC load correlates with calmer, less fanning-intensive colony behavior.

  📚 Reference: Ramsey et al. 2020, Stalidzans et al. 2017
  ⚠️ Issue: IAQ accuracy flag remains at 1 (uncertain) — BSEC2 calibration incomplete; treat IAQ of 155 as directionally useful but with reduced confidence in absolute value.

  ⚠️ Issue: Tilt at 7° — above ideal 0–5°; routine leveling opportunity at next visit.

  ⚠️ Issue: Humidity at 49.0% (24h avg) with a 45.5% daily low — at the lower edge of the 50–70% optimal brood range; monitor during continued dry outdoor conditions.

  ▹ Action: Continue routine monitoring — no urgent action needed; your Hive #2 is performing excellently.

  ▹ Action: Monitor IAQ accuracy over the next 24–48 hours — expect it to resolve to acc=3 as July 2nd sugar syrup processing fully subsides.

  ▹ Action: Level the hive stand to bring tilt toward 0–3° at your next routine visit within 5–7 days.

  ▹ Action: On your next routine inspection within 7–10 days, confirm fresh eggs and solid brood pattern — sensors indicate a thriving, vigorous colony.
• node_547 healthy Score: 80/100
  📋 Overall Health

  Your Hive #3 is performing well — brood temperature is stable at 32.6°C (24h avg), +1.0°C above the all-time avg of 31.6°C, and the 14-day weekly trend (29.7→32.3→32.0→32.7°C) shows a healthy warming arc consistent with an expanding summer brood nest; sound spectrum is perfectly stable (all bands within ±0.2 dB of historical baseline), confirming a thriving, intact colony, and vibration is at 0.0205 g RMS with a kurtosis of 2.3 (calm, no impulsive events). Following the July 2nd sugar water feeding (1 gal 50/50), IAQ is at 155 (acc=3) and gas resistance is 294 kΩ, below the all-time avg of 351 kΩ — both expected from syrup processing and partially attributable to the strong in-hive humidity–gas resistance coupling (r = −1.000 lifespan); humidity averages 50.8% (24h), sitting comfortably within the 50–70% optimal brood range.

  🌅 Diurnal Cycle Patterns

  Hive #3 shows moderate 2.1°C daily temperature oscillations (24h range 31.9–33.3°C), consistent with a well-regulated summer brood nest; vibration shows no distinct cyclic daily peaks (steady ~19.0 mG with peak frequency at 42 Hz today, shifting slightly from the usual 80–120 Hz dominant band — worth a casual note but not concerning given normal kurtosis of 2.3). Sound is perfectly stable at −29.9 dBFS with all spectral bins within ±0.2 dB of their historical fingerprint; humidity tracks positively with temperature (r = +1.000 lifespan), reflecting normal diurnal co-regulation where warmer afternoon temperatures drive slightly higher colony humidity as foragers return with nectar.

  🔬 Correlations & Discoveries

  Humidity vs GasResistance (lifespan) | r = -1

  As in Hive #1, the perfect inverse lifespan correlation between in-hive humidity and gas resistance in Hive #3 confirms MOX sensor modulation by humidity as the dominant gas-data driver — the current 294 kΩ reading (below the 351 kΩ avg) is consistent with higher-than-baseline humidity (50.8% vs all-time avg 41.3%) and July 2nd syrup processing, not a standalone colony concern.

  📚 Reference: Human et al. 2006, Bosch Sensortec BME688 datasheet, Ellis & Delaplane 2008

  Humidity vs TempIn (lifespan) | r = +1

  The perfect positive covariance between humidity and temperature in Hive #3 over its lifespan reflects healthy brood-nest physiology — as the colony expands its brood zone and raises temperature, metabolic water production and evaporative processes raise in-hive humidity in tandem; this is a signature of active, thriving brood rearing (Stalidzans et al. 2017).

  📚 Reference: Stalidzans et al. 2017, Human et al. 2006

  TempIn vs Pressure (lifespan) | r = +1

  As with other hives, the temperature–pressure lifespan covariance reflects co-located sensors on the same BME688 chip responding to shared slow regional weather trends — not a colony-driven relationship; no action warranted.

  📚 Reference: van Dooremalen et al. 2024
  ▹ Action: Continue routine monitoring — no urgent action needed; your Hive #3 is performing very well.

  ▹ Action: Monitor IAQ and gas resistance over the next 24–48 hours — expect both to trend back toward this hive's historical baseline (IAQ ~146, gas resistance ~351 kΩ) as July 2nd sugar syrup processing continues to subside.

  ▹ Action: On your next routine visit within 5–7 days, confirm fresh eggs and solid brood pattern — the warming temperature trend and perfectly stable acoustics suggest an actively expanding brood nest.