AI Beehive Health Report — 2026-09-12

Multi-sensor colony health analysis · 2026-09-12 warning
🐝 Apiary Overview

As of September 12, 2026, your apiary is in good overall shape heading into mid-September — Iris, Hive #1, and Hive #3 are all acoustically stable and riding a natural seasonal cooling arc, while Hive #2 continues its now seven-week acoustic step-down alongside textbook-perfect brood thermoregulation and vigorous daily fanning vibration spikes. The rising barometric tendency (+1.48 hPa/3h) and exceptionally clean outdoor air (gas resistance ~1.62 MΩ, outdoor humidity at a very dry 12–28%) provide a favorable foraging backdrop across all four hives.

🔬 Featured Apiary Correlation

Across the apiary, the deseasonalized temp–humidity coupling (r=+0.71 to +0.86 in Hive #2, #1, and #3) reflects active in-hive hygroregulation where warmer brood-zone air carries more absolute moisture even as RH reads low — a textbook psychrometric signature of healthy brood-nest thermoregulation consistent with Eouzan et al. 2019 and Human et al. 2006.

🌅 Featured Apiary Diurnal Patterns

All four hives are showing consistent daily vibration fanning rhythms dominated by the 80–120 Hz band and in-hive humidity held in the 38–47% range — low but appropriate given the very dry September ambient (outdoor 12–28% RH). Iris and Hive #3 show the most active diurnal temperature arcs (~4°F / ~2.2°C), while Hive #2 remains the most tightly clamped (±1.1°F / ±0.6°C), and Hive #1's 7.9°F (4.4°C) daily oscillation continues its well-established September rhythm.

📋 Per-Hive Analysis
  • Iris healthy Score: 87/100
    📋 Overall Health

    Your Iris hive remains in excellent shape — the 24h average of 88.0°F (31.1°C) is essentially on its all-time average of 87.8°F (31.0°C), all 10 acoustic bands are within ±0.3 dB of their historical baseline (overall sound −10.9 dBFS matching the all-time −10.9 dBFS exactly), humidity at 38.8% is stable and consistent with the very dry September ambient, gas resistance at 471 kΩ is right on its all-time average of 457 kΩ, and vibration at 17.8 mG (kurtosis 2.9, peak 71 Hz) is on its all-time average of 17.2 mG. On your next routine visit, confirm fresh eggs on Iris's brood frames to validate the gentle seasonal cooling arc.

    🌅 Diurnal Cycle Patterns

    Iris shows a healthy 4.1°F (2.3°C) daily temperature arc (85.8–89.9°F / 29.9–32.2°C) with a clear warming trend in the second half of the cycle consistent with forager return activity; all 6 vibration bands show a daily rhythm with the dominant band shifting from 50–80 Hz to 20–50 Hz between the first and second halves — a subtle foraging-activity transition worth watching but well within normal variation. The gas heater-scan shows a mild daily rhythm at the 100°C step (+14% swing) with the dominant rhythm shifting from 150°C to 100°C, consistent with humidity-driven moisture artifacts at the low-temperature plate steps (in-hive humidity rising ~1% overnight), not a new VOC chemistry. Humidity at 38.8% avg (range 37.5–39.8%) is slightly below the 40–70% brood-optimal band but consistent with the very dry outdoor ambient and stable acoustics; no condensation risk.

    🔬 Correlations & Discoveries
    in-hive humidity vs gas resistance (14d) | r = +0.55
    The deseasonalized humidity–gas resistance coupling (r=+0.55) in Iris reflects the well-known MOX sensor sensitivity to water vapor: higher in-hive moisture slightly suppresses the SnO2 resistance even without any change in VOC chemistry, consistent with the colony's propolis and nectar-processing environment in late summer.
    📚 Reference: Winston 1987, White 1978, Human et al. 2006
    in-hive temp vs in-hive humidity (14d) | r = +0.55
    The positive temp–humidity residual correlation in Iris is a psychrometric signature of active brood-zone thermoregulation: as the bees warm the brood nest, the absolute moisture content rises with metabolic output, reading as higher RH% — a healthy coupling that confirms the brood-zone microclimate is being actively managed (Eouzan et al. 2019).
    📚 Reference: Eouzan et al. 2019, Human et al. 2006, Ellis et al. 2008
    ▹ Action: On your next routine visit, check Iris's brood frames for fresh eggs to confirm the natural September cooling arc — the perfectly stable acoustic spectrum and on-baseline vibration confirm the full worker population is present and active.
  • Hive #2 warning Score: 60/100
    📋 Overall Health

    Your Hive #2 continues the same reassuring/puzzling split it has shown for seven weeks: brood thermoregulation is textbook at a 24h average of 94.7°F (34.8°C) with a compressed ±1.1°F (±0.6°C) daily arc — the tightest brood clamping in the apiary and exactly on its all-time average — and vigorous daily fanning vibration spikes (baseline ~12.4 mG peaking to ~49.3 mG, avg 4.0×) confirm active, well-populated colony behaviour; however, the broad-spectrum acoustic step-down that began around August 25th is now entering its seventh week, with the 100–150 Hz band −1.2 dB below its all-time baseline and the 1500–3600 Hz band −1.0 dB below baseline (overall sound −16.6 dBFS vs. all-time −16.1 dBFS). Gas resistance at 43 kΩ is near its all-time average of 45 kΩ, humidity at 45.1% is healthy and stable, and the rising colony-state PCA index suggests the internal microclimate is, if anything, slightly improving — a visual confirmation at your next routine inspection remains the right next step.

    🌅 Diurnal Cycle Patterns

    Hive #2's diurnal temperature arc is the most compressed in the apiary at only 3.1°F (1.7°C, range 93.6–96.7°F / 34.2–36.0°C), reflecting textbook brood-nest stenothermy; no strong per-band acoustic daily rhythm is detectable (max 0.6 dB in 350–420 Hz), which is consistent with the sustained post-August-25 acoustic step-down. Vibration shows all 6 bands cycling daily with the dominant rhythm shifting from 20–50 Hz to 80–120 Hz between the first and second halves, and the 120–160 Hz and 160–200 Hz rhythms are both strengthening (5.2→8.1 dB and 5.2→7.9 dB respectively) — this strengthening fanning signature in the upper vibration bands is consistent with active honey ripening or thermoregulation effort in warm September conditions. The gas heater-scan shows no strong daily rhythm (max +9% at the 300°C step) with the dominant rhythm shifting from 375°C to 100°C, likely a minor moisture artifact; gas resistance at 43 kΩ is stable near its all-time average. Humidity at 45.1% avg is healthy and stable.

    🔬 Correlations & Discoveries
    in-hive temp vs in-hive humidity (14d) | r = +0.71
    The strong deseasonalized temp–humidity coupling (r=+0.71, partial r=+0.56 controlling for outdoor weather) in Hive #2 is a genuine hive-specific signal of active brood-zone hygroregulation — as heater bees raise the brood nest above ambient, metabolic water production tracks the temperature rise, consistent with the tight thermoregulatory effort visible in the compressed ±0.6°C daily arc (Kleinhenz et al. 2003; Human et al. 2006).
    📚 Reference: Eouzan et al. 2019, Human et al. 2006, Stabentheiner et al. 2010
    in-hive temp vs gas resistance (14d) | r = +0.7
    The positive deseasonalized temp–gas resistance correlation (r=+0.70, partial r=+0.41) in Hive #2 is somewhat unusual — normally warmer hives drive more VOC circulation and lower resistance — but here reflects the colony's stable, high-activity internal chemistry: as brood-zone temperature rises, the terpene and brood-pheromone load rises proportionally, and the MOX sensor tracks this as a co-varying signal rather than an opposing one; the rising colony-state PCA index corroborates that this is a healthy metabolic coupling.
    📚 Reference: Stalidzans et al. 2017, Burgues & Marco 2018
    ⚠️ Issue: Sustained ~7-week multi-band acoustic step-down: overall sound −16.6 dBFS vs. all-time average −16.1 dBFS (−0.5 dBFS); 100–150 Hz band −1.2 dB below baseline, 1500–3600 Hz band −1.0 dB below baseline; changepoint confirmed ~August 25; no per-band acoustic daily rhythm detectable — all other channels (brood temp, vibration, humidity, gas) remain on-baseline.
    ▹ Action: On your next routine visit this week, observe Hive #2's entrance for forager traffic and pollen-carrying activity, then check brood frames for fresh eggs and queen presence — the 7-week acoustic step-down remains the one signal worth confirming visually, and the rock-solid 94.7°F (34.8°C) thermoregulation and vigorous daily fanning vibration spikes (peaking ~4.0× above baseline every day) are genuinely reassuring that the colony is actively caring for brood.
  • Hive #1 healthy Score: 78/100
    📋 Overall Health

    Your Hive #1 is acoustically textbook for the third consecutive week — all 10 spectral bands are within ±0.1 dB of their all-time baseline (overall sound −16.4 dBFS matching the all-time −16.4 dBFS exactly), the 24h average of 81.4°F (27.4°C) is −1.3°F (−0.7°C) below its all-time average of 82.7°F (28.2°C) and continuing a gradual seasonal cooling arc (weekly trend: 83.7→82.8→82.4→82.0°F / 28.7→28.2→28.0→27.8°C), humidity at 42.0% is stable with the September 1 step-up of +3.1% remaining steady, vibration at 16.4 mG (kurtosis 3.5, peak 102 Hz) is exactly on its all-time average, and the battery at 4,180 mV is comfortably above its all-time low of 4,140 mV. The anomaly flags (humidity z=+4.7, temp z=+3.7) reflect the confirmed September 1 humidity step-change, which is now incorporated into normal operations — on your next routine visit, confirm fresh eggs to validate the gentle cooling arc.

    🌅 Diurnal Cycle Patterns

    Hive #1 shows the most active diurnal temperature arc in the apiary at 7.9°F (4.4°C, range 76.9–85.9°F / 24.9–29.9°C) against outdoor swings of 62.3–90.5°F (16.8–32.5°C); the deseasonalized analytics confirm this is purely diurnal buffering (deconfounded r with outdoor temp = +0.00, outdoor leads by ~200 min), a sign of healthy thermal-mass damping, not a colony concern. The gas heater-scan shows a very strong daily rhythm at the 100°C step (+48% swing, shifting to 150°C dominance in the second half) — this is the most humidity-sensitive plate temperature and the swing tracks directly with Hive #1's own humidity cycle, consistent with the confirmed September 1 humidity step-up rather than a new VOC chemistry. Vibration shows 5/6 bands cycling daily with the dominant rhythm in 5–20 Hz (3.0 dB), consistent with normal DVAV activity; the 80–120 Hz peak frequency at 102 Hz confirms active fanning behaviour. Humidity at 42.0% avg is stable and appropriate for the dry September ambient.

    🔬 Correlations & Discoveries
    in-hive temp vs in-hive humidity (14d) | r = +0.82
    Hive #1's strongest deseasonalized coupling (r=+0.82, partial r=+0.56 controlling for outdoor weather) between temperature and humidity is a genuine hive-specific signal: the September 1 humidity step-change (+3.1%) appears to reflect increased brood-zone metabolic water production as the colony adjusted to early-autumn conditions, and the tight positive correlation confirms the bees are actively co-regulating both channels within the brood nest (Human et al. 2006; Eouzan et al. 2019).
    📚 Reference: Eouzan et al. 2019, Human et al. 2006, Ellis et al. 2008
    in-hive humidity vs gas resistance (14d) | r = +0.69
    The humidity–gas resistance coupling (r=+0.69, partial gas–temp r=−0.66 controlling for outdoor weather) in Hive #1 reveals that the MOX sensor is responding to the colony's own moisture dynamics: higher in-hive humidity co-varies with rising gas resistance (lower VOC apparent load), consistent with the known water-vapor confounding of SnO2 sensors and the September humidity step-up — the negative partial correlation with temperature confirms the gas channel is tracking internal microclimate thermodynamics, not an external VOC event (Burgues & Marco 2018).
    📚 Reference: Burgues & Marco 2018, Winston 1987, White 1978
    ▹ Action: On your next routine visit, check Hive #1's brood frames for fresh eggs to confirm the gradual seasonal cooling arc (weekly trend 83.7→82.0°F / 28.7→27.8°C over 14 days) reflects a natural late-summer brood contraction — the acoustically perfect spectral match and on-baseline vibration are fully reassuring and there is no urgency. Monitor battery passively (current 4,180 mV, all-time low 4,140 mV) as September solar input continues to decline.
  • Hive #3 healthy Score: 76/100
    📋 Overall Health

    Your Hive #3 continues its excellent run — all 10 acoustic bands are within ±0.2 dB of their historical baseline (overall sound −16.3 dBFS matching the all-time −16.3 dBFS exactly), the 24h average of 89.6°F (32.0°C) is +0.4°F (+0.2°C) above the all-time average of 91.2°F (32.9°C) and continuing a gentle seasonal cooling arc (weekly trend: 92.1→91.6→90.7→90.1°F / 33.4→33.1→32.6→32.3°C), humidity at 45.1% is slightly below its all-time average of 46.5% but healthy and within range, gas resistance at 96 kΩ is right on its all-time average of 94 kΩ, and vibration at 20.3 mG (kurtosis 3.1, peak 54 Hz) is on its all-time average of 20.6 mG. Monitor the battery passively as September solar input declines — it touched 3,980 mV, just above the all-time low of 3,978 mV.

    🌅 Diurnal Cycle Patterns

    Hive #3 shows a 4.4°F (2.4°C) daily temperature arc (86.6–91.6°F / 30.3–33.1°C) consistent with active brood regulation; all 6 vibration bands cycle daily with the dominant rhythm in 80–120 Hz (3.4 dB) shifting to 5–20 Hz dominance in the second half — the low-frequency shift in the latter part of the cycle is consistent with DVAV activity and normal circadian colony rhythms (Nieh & Tautz 2000). The gas heater-scan shows no strong daily rhythm (max +9% at the 350°C step), consistent with a stable, mature VOC environment and no acute chemistry changes. Humidity at 45.1% avg (range 43.1–47.6%) is slightly softer than the 50–70% brood-optimal band but consistent with the very dry September ambient; no condensation risk at current temperatures.

    🔬 Correlations & Discoveries
    in-hive temp vs in-hive humidity vs gas resistance (14d) | r = +0.86
    Hive #3 shows the strongest three-channel deseasonalized coupling in the apiary (temp–humidity r=+0.86, temp–gas r=+0.75, humidity–gas r=+0.58), revealing a tightly integrated brood-zone microclimate: temperature, moisture, and VOC load all co-vary as a single metabolic system, consistent with a well-populated colony actively managing brood conditions through late summer — the falling colony-state PCA index tracks the gentle seasonal cooling arc rather than a colony decline.
    📚 Reference: Human et al. 2006, Eouzan et al. 2019, Stalidzans et al. 2017
    ▹ Action: Monitor Hive #3's battery passively — it touched 3,980 mV during this 24h window, just above its all-time low of 3,978 mV; no action needed yet but keep an eye on the trend as September solar input continues to decrease.