As of September 2, 2026, your apiary is heading into early autumn in broadly good health — Iris, Hive #1, and Hive #3 are running normal late-summer cooling patterns with acoustically intact populations, while Hive #2 remains the single hive to watch, its 21-day acoustic step-down now holding steady at −16.6 dBFS against a textbook-locked 94.5°F (34.7°C) brood temperature.
All three reporting hives with cooling temperature trends (Iris, Hive #1, Hive #3) show perfectly stable acoustic spectral fingerprints — a textbook illustration of the post-swarm/brood-break discriminator: falling temperature + intact acoustics = brood rearing paused, worker population fully present (Seeley 1985; Winston 1987).
Against outdoor swings of 60.5–79.7°F (15.8–26.5°C) at 38–64% RH with pressure easing slightly higher (+0.63 hPa/3h, a gentle clearing tendency), all four hives show clear daily vibration rhythms and in-hive humidity tracking in the 43–50% range — consistent with the dry late-summer ambient and well within normal ventilation parameters with no condensation risk.
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Iris healthy Score: 80/100📋 Overall Health
Your Iris hive continues its gradual seasonal cooling arc — the 24h average of 84.7°F (29.3°C) is now 3.8°F (2.1°C) below the all-time average of 88.5°F (31.4°C), extending the four-week drift from 90.1°F (32.3°C); crucially, all 10 acoustic bands sit within ±1.2 dB of their historical baseline (well inside the ±2 dB stable threshold), confirming the full worker population is present and this is a natural brood-break or late-summer brood contraction with bees simply not heating a full brood zone. Humidity at 42.7% is consistent with the dry ambient and this hive's own norm, gas resistance at 481 kΩ is slightly above the all-time average of 451 kΩ (a benign, stable reading), and vibration at 17.1 mG (kurtosis 2.5, peak 130 Hz) sits right on its all-time average — on your next routine visit, a quick brood-frame check will confirm the seasonal trajectory.
🌅 Diurnal Cycle PatternsA healthy 5.2°F (2.9°C) daily temperature arc (82.6–87.3°F / 28.1–30.7°C) with clear diurnal vibration peaks on 14 of 15 days (baseline ~16.6 mG rising to ~24.6 mG) confirms active fanning and foraging rhythms; humidity holds a tight 41–44% band tracking the dry outdoor ambient, and the 200–260 Hz sound band showed a modest +1.2 dB rise in the second half of the day — worth monitoring passively as a potential low-level pre-autumn recruitment signal, though it remains well within baseline.
🔬 Correlations & Discoveriestemperature_in vs humidity_in (14d) | r = +0.46The deconfounded positive coupling between in-hive temperature and humidity in Iris reflects normal psychrometric homeostasis: as the colony warms during peak activity, absolute moisture content rises with metabolic output, reading as higher RH% — active hygroregulation, not a ventilation problem.📚 Reference: Eouzan et al. 2019 (PMC6368279), Human, Nicolson & Dietemann 2006humidity_in vs gas_resistance (14d) | r = +0.44Rising in-hive humidity modestly suppresses MOX gas resistance through water-vapor interference on the SnO2 sensing layer — a sensor-physics effect that confirms Iris's gas readings should always be interpreted alongside the humidity channel, not in isolation.📚 Reference: Burgues & Marco 2018, Winston 1987▹ Action: On your next routine visit, check Iris's brood frames for fresh eggs to confirm the ongoing 14-day cooling drift (90.1→84.7°F / 32.3→29.3°C) reflects a natural late-summer brood contraction — the acoustically intact population is reassuring. -
Hive #2 warning Score: 60/100📋 Overall Health
Your Hive #2 brood temperature remains locked at a textbook 94.5°F (34.7°C) — a razor-tight 2.9°F (1.6°C) daily arc just 0.4°F (0.2°C) below its all-time average of 94.9°F (35.0°C) — confirming excellent thermoregulation and an active brood nest; the acoustic step-down that began around August 24th is now at 21 days, with overall sound at −16.6 dBFS versus the all-time average of −11.8 dBFS (a −4.8 dBFS deviation), the 100–150 Hz band down −11.0 dB and the 1500–3600 Hz band down −8.7 dB, and daily rhythm strength in these bands continuing to weaken (100–150 Hz: 6.0→1.0 dB). Humidity at 48.8% is healthy and slightly above its all-time average of 46.5%, vibration at 14.1 mG (kurtosis 3.3, peak 79 Hz) remains near its all-time average of 14.9 mG, and gas resistance at 44 kΩ is near its own all-time average of 50 kΩ — the combination of locked thermoregulation with a persistent broad-spectrum acoustic step-down that is no longer recovering warrants a visual confirmation at your next routine inspection this week.
🌅 Diurnal Cycle PatternsAn impressively tight 2.0°F (1.1°C) daily temperature arc (92.7–95.6°F / 33.7–35.4°C) reflects textbook brood-nest stenothermy; vibration shows the strongest daily rhythm in the apiary (20–50 Hz band, 5.4 dB swing, peaks 4.1× baseline on all 15 days), while the acoustic daily rhythm in the 100–150 Hz band has progressively weakened from 6.0 dB to 1.0 dB over the window — a loss of the low-frequency colony hum that co-exists with perfectly intact thermoregulation, pointing to a quieter but thermally competent colony.
🔬 Correlations & Discoveriessound_energy vs temperature_in (14d) | r = -0.48The sustained acoustic step-change (−6.76 dBFS confirmed ~Aug 24) with simultaneously locked brood temperature is the key diagnostic pattern: thermoregulation requires only a fraction of the adult population, so a smaller-but-present workforce can maintain 94–95°F (34–35°C) while generating noticeably less aggregate sound — consistent with a natural population reduction (late-season contraction, post-swarm recovery, or brood-cycle compression) rather than colony failure.📚 Reference: Ramsey et al. 2020, Sci. Rep. 10:9798, Seeley 1985temperature_in vs gas_resistance (14d) | r = +0.47The positive deconfounded coupling of in-hive temperature with gas resistance in Hive #2 is notable: as metabolic activity (and thus temperature) rises, VOC load rises and gas resistance falls — the positive sign here means the two are tracking together, which alongside stable thermoregulation suggests the VOC baseline is coupled to active brood/propolis chemistry rather than a stress signal.📚 Reference: Stalidzans et al. 2017, Seeley 1974⚠️ Issue: Sustained 21-day multi-band acoustic step-down: overall sound −16.6 dBFS vs all-time average −11.8 dBFS (−4.8 dBFS); 100–150 Hz band −11.0 dB below baseline, 1500–3600 Hz band −8.7 dB below baseline; daily low-frequency rhythm weakening (100–150 Hz: 6.0→1.0 dB) — brood temperature, vibration, humidity, and gas all remain on-baseline.▹ Action: On your next routine visit this week, observe Hive #2's entrance for forager traffic and pollen-carrying activity, and check brood frames for fresh eggs and queen presence — the 21-day acoustic step-down is the one signal worth confirming visually, even though the rock-solid 94.5°F (34.7°C) thermoregulation is reassuring. -
Hive #1 healthy Score: 78/100📋 Overall Health
Your Hive #1 continues its gradual but acoustically-confirmed-benign cooling drift — the 24h average of 80.8°F (27.1°C) is now 4.0°F (2.2°C) below the all-time average of 84.8°F (29.3°C), extending a steady 14-day decline from 87.7°F (30.9°C); all 10 acoustic bands remain within ±0.2 dB of their all-time baseline — a near-perfect spectral match that confirms the full worker population is intact, pointing clearly to a natural late-summer broodless or reduced-brood period as the explanation for the temperature decline. Humidity at 45.6% is slightly above this hive's all-time average of 40.1% but well within the healthy range, gas resistance at 527 kΩ is on-baseline, and vibration at 16.7 mG (kurtosis 2.8, peak 55 Hz) sits right on its all-time average of 16.4 mG — on your next routine visit, a check for fresh eggs will clarify whether this reflects a natural seasonal contraction or a brief laying pause.
🌅 Diurnal Cycle PatternsA 6.2°F (3.4°C) daily temperature arc (78.2–83.4°F / 25.7–28.6°C) with 14 of 15 days showing clear vibration peaks (15.8→22.8 mG, avg 1.4×) confirms active fanning and foraging rhythms; the gas heater-scan shows a strong 35% daily swing at the 100°C step across all 10 bands, reflecting the expected propolis/brood-pheromone VOC cycling with ambient temperature — a benign, well-structured daily chemistry fingerprint.
🔬 Correlations & Discoveriesgas_resistance vs temperature_in (14d) | r = -0.86The strong partial correlation of gas resistance with in-hive temperature (controlling for outdoor weather, r=−0.86) in Hive #1 captures a well-known MOX physics effect: as the hive warms during active periods, VOC emission rates increase and SnO2 resistance falls — the resistance-vs-temperature coupling here is a hive-metabolism fingerprint, not a VOC anomaly.📚 Reference: Maisonnasse et al. 2010, Burgues & Marco 2018humidity_in vs gas_resistance (14d) | r = +0.48As in Iris, the positive humidity–gas resistance coupling reflects water-vapor confounding of the MOX sensor — when the hive dries out slightly, resistance rises; when humidity climbs with metabolic activity, resistance falls — reinforcing that gas readings here should always be read alongside the humidity channel.📚 Reference: Burgues & Marco 2018, Ellis et al. 2008▹ Action: On your next routine visit, check Hive #1's brood frames for fresh eggs and brood pattern to confirm the 14-day cooling drift (87.7→80.8°F / 30.9→27.1°C) reflects a natural late-summer brood contraction — the acoustically intact population (all bands within ±0.2 dB of baseline) is reassuring and there is no urgency. -
Hive #3 healthy Score: 82/100📋 Overall Health
Your Hive #3 continues its excellent run — the 24h average of 90.4°F (32.4°C) sits 2.2°F (1.2°C) below the all-time average of 92.6°F (33.6°C), continuing a gentle and entirely normal seasonal tail-off (93.4→92.5→91.9→90.4°F); all 10 acoustic bands are within ±0.1 dB of their historical baseline — a textbook-stable fingerprint — with humidity at 49.1% (healthy and on-baseline), gas resistance at 90 kΩ near its all-time average of 93 kΩ, and vibration at 20.5 mG (kurtosis 2.6, peak 40 Hz) sitting right on its all-time average of 20.8 mG. The battery touched a low of 3,984 mV within the 24h window (all-time low: 3,982 mV) — passively worth monitoring as solar input decreases into autumn, but no action needed yet.
🌅 Diurnal Cycle PatternsA 3.2°F (1.8°C) daily temperature arc (88.9–91.9°F / 31.6–33.3°C) is the tightest at the apiary, consistent with active brood-nest clamping; all 6 vibration bands show a clear daily rhythm (dominant 160–200 Hz, 3.6 dB swing; peaks rising to 35.0 mG on 15 of 15 days), and the gas heater-scan is notably flat with no strong per-band daily rhythm (max 9% at 320°C) — consistent with a stable, well-sealed hive environment with minimal VOC cycling.
🔬 Correlations & Discoveriestemperature_in vs gas_resistance (14d) | r = +0.51The positive deconfounded coupling of in-hive temperature with gas resistance in Hive #3 mirrors the brood-metabolic relationship seen in Hive #2: rising brood activity lifts temperature and increases VOC emission (brood pheromones, honey ripening), lowering resistance — a healthy physiological coupling, not a stress indicator.📚 Reference: Stalidzans et al. 2017, Maisonnasse et al. 2010temperature_in vs humidity_in (14d) | r = +0.56Hive #3's strong temperature–humidity coupling (r=+0.56, the highest in the apiary) reflects vigorous active hygroregulation tied to brood metabolic output — a sign of a well-populated, actively brooding colony maintaining its microclimate.📚 Reference: Human, Nicolson & Dietemann 2006, Eouzan et al. 2019 (PMC6368279)▹ Action: Monitor Hive #3's battery passively — it touched its all-time low of 3,982 mV within the last 24 hours (currently 4,016 mV); no action needed yet, but keep an eye on the trend as solar input decreases heading into autumn.▹ Action: On your next routine visit, note capping progress on Hive #3's frames — the stable acoustic and gas fingerprints suggest consistent colony activity and a capped-frame count will help plan late-summer harvest timing.