As of September 3, 2026, your apiary is in solid early-autumn shape — Iris, Hive #1, and Hive #3 all show acoustically intact populations riding a natural late-summer cooling arc, while Hive #2 remains the one hive to watch, its 22-day broad-spectrum acoustic step-down now holding steady at −16.6 dBFS against a textbook-locked 94.8°F (34.9°C) brood temperature that still confirms an active, well-regulated nest.
All three acoustically stable hives (Iris, Hive #1, Hive #3) show gradual multi-week temperature cooling with fully intact spectral fingerprints — a textbook late-summer brood contraction pattern consistent with queens reducing laying as days shorten, while the population remains whole; Hive #2 is the outlier, decoupling acoustic energy from thermal regulation in a way that warrants a visual confirmation this week.
Against outdoor swings of 61.5–84.6°F (16.4–29.2°C) at 19–49% RH with a steady barometric tendency (+0.10 hPa/3h — settled conditions), all four hives show consistent daily vibration activity rhythms and in-hive humidity tracking in the 42–48% range, consistent with the very dry ambient (outdoor RH as low as 19%) and well within safe ventilation parameters with no condensation risk.
-
Iris healthy Score: 80/100📋 Overall Health
Your Iris hive continues its natural late-summer cooling arc — the 24h average of 86.3°F (30.1°C) extends the gentle 14-day drift from 88.6°F (31.4°C), now sitting 2.0°F (1.1°C) below the all-time average of 88.3°F (31.3°C); crucially, all 10 acoustic bands sit within ±0.7 dB of their historical baseline (well inside the ±2 dB stable threshold), confirming the full worker population is intact and this reflects a natural late-summer brood contraction. Humidity at 42.5% is consistent with the dry ambient and this hive's own norm, gas resistance at 458 kΩ is right on the all-time average of 453 kΩ, and vibration at 17.0 mG (kurtosis 3.0, peak 63 Hz) is on-baseline — on your next routine visit, a quick brood-frame check will confirm the seasonal trajectory.
🌅 Diurnal Cycle PatternsIris shows active 24h temperature cycles averaging a 4.8°F (2.7°C) daily swing (83.9–88.7°F / 28.9–31.5°C), just within the healthy brood-regulation band, with 15/15 days showing clear vibration activity peaks (baseline ~16.6 mG rising to ~24.9 mG, avg 1.5×) confirming a consistent fanning/foraging rhythm. The sound spectrum's dominant daily rhythm has shifted from the 200–260 Hz band toward 260–350 Hz between the first and second half of the window — a subtle spectral migration consistent with normal seasonal foraging-activity changes rather than any anomaly. Gas heater-scan shows a modest 100°C step leading daily rhythm (+19% swing at 150°C), reflecting normal humidity-driven MOX variation at low plate temperatures; mid and high steps (320–400°C) are stable against this hive's own history.
🔬 Correlations & Discoveriestemperature_in vs humidity_in (14d) | r = +0.51The deconfounded r=+0.51 between in-hive temperature and humidity residuals reflects the psychrometric inverse at work: as the colony warms during peak activity, the same absolute moisture content registers as lower RH%, and as it cools, RH rises — active hygroregulation, not a ventilation issue. This coupling is a signature of a healthy, brood-rearing cluster managing its microclimate.📚 Reference: Human, Nicolson & Dietemann 2006, Eouzan et al. 2019humidity_in vs gas_resistance (14d) | r = +0.45The genuine r=+0.45 correlation between in-hive humidity and gas resistance (rising together) reflects water vapor's direct suppression of the MOX sensing layer — higher RH reduces SnO2 sensitivity, raising apparent resistance independently of any VOC change; the fact that both channels are stable against Iris's own history confirms this is sensor physics, not a colony event.📚 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 (88.6→86.3°F / 31.4→30.1°C) reflects a natural late-summer brood contraction — the acoustically intact population is fully reassuring. -
Hive #2 warning Score: 60/100📋 Overall Health
Your Hive #2 brood temperature remains locked at a textbook 94.8°F (34.9°C) — a razor-tight 1.7°F (0.9°C) daily arc just 0.1°F (0.1°C) below its all-time average of 94.9°F (35.0°C) — confirming excellent active thermoregulation and an intact brood nest; the acoustic step-down that began around August 24th is now at 22 days, with overall sound at −16.6 dBFS versus the all-time average of −12.3 dBFS (a −4.3 dBFS deviation), with the 100–150 Hz band down −9.8 dB and the 1500–3600 Hz band down −7.7 dB from baseline, and the daily low-frequency rhythm continuing to weaken (100–150 Hz: 7.8→0.2 dB). Humidity at 47.8% is healthy and on-baseline, vibration at 14.4 mG (kurtosis 2.9, peak 46 Hz) remains near its all-time average of 14.9 mG, gas resistance at 44 kΩ is near its all-time average of 49 kΩ — the combination of locked thermoregulation with a persistent broad-spectrum acoustic step-down that shows no sign of recovering warrants a visual confirmation at your next routine inspection this week.
🌅 Diurnal Cycle PatternsHive #2 shows the tightest brood clamping in the apiary — a compressed 1.7°F (0.9°C) daily arc (93.8–95.5°F / 34.3–35.3°C) — a textbook incubation signature with 15/15 days showing strong vibration activity peaks (baseline ~12.5 mG spiking to ~49.6 mG, avg 4.0×). The sound daily rhythm has weakened markedly: the 100–150 Hz band daily cycle has collapsed from 7.8 dB to 0.2 dB amplitude over the window, and the 150–200 Hz band from 6.0 dB to 0.7 dB — the diurnal acoustic structure is flattening even as thermoregulation remains intact. Gas heater-scan shows no strong per-band daily rhythm (max 280°C step +9% swing), and the scan shape — steeply falling from 100°C through 320°C then flattening slightly at 375–400°C — is consistent with this hive's own baseline VOC profile and the active brood pheromone load of a colony with an intact nest.
🔬 Correlations & Discoveriestemperature_in vs sound_energy (14d) | r = -0.65The change-point analysis confirms a sustained −6.5 dBFS acoustic step-down from ~August 24th while brood temperature has remained perfectly locked at 94.8°F (34.9°C) — a decoupling of acoustic energy from thermal regulation that is the central diagnostic question for this hive; the intact thermoregulation rules out population collapse, but the 22-day non-recovering broad-spectrum acoustic decline spanning 100–150 Hz (−9.8 dB) through 1500–3600 Hz (−7.7 dB) is worth a visual confirmation of forager traffic and queen/brood status.📚 Reference: Ramsey et al. 2020, Kanelis et al. 2023, Seeley & Tautz 2001temperature_in vs gas_resistance (14d) | r = +0.49The genuine r=+0.49 between in-hive temperature and gas resistance reflects the expected MOX thermodynamic coupling: as heater-bee activity warms the nest, increased airflow and volatile circulation reduce apparent gas resistance, and vice versa — a sign of normal metabolic coupling between thermal and chemical channels, not an anomaly.📚 Reference: Stabentheiner et al. 2010, Burgues & Marco 2018⚠️ Issue: Sustained 22-day multi-band acoustic step-down: overall sound −16.6 dBFS vs all-time average −12.3 dBFS (−4.3 dBFS); 100–150 Hz band −9.8 dB below baseline, 1500–3600 Hz band −7.7 dB below baseline; daily low-frequency rhythm collapsed (100–150 Hz: 7.8→0.2 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 22-day acoustic step-down is the one signal worth confirming visually, and the rock-solid 94.8°F (34.9°C) thermoregulation is genuinely reassuring. -
Hive #1 healthy Score: 77/100📋 Overall Health
Your Hive #1 continues its gradual and acoustically-confirmed-benign cooling drift — the 24h average of 81.6°F (27.5°C) extends the steady 14-day decline from 84.2°F (29.0°C), now 3.0°F (1.7°C) below the all-time average of 84.6°F (29.2°C); all 10 acoustic bands remain within ±0.1 dB of their all-time baseline — a near-perfect spectral match confirming the full worker population is intact, and the most likely explanation is a natural late-summer brood contraction or brief laying pause. Humidity at 46.4% is slightly above this hive's all-time average of 40.5% but well within the healthy range, gas resistance at 502 kΩ is right on-baseline (all-time avg 508 kΩ), and vibration at 16.6 mG (kurtosis 2.8, peak 65 Hz) sits on its all-time average of 16.4 mG — on your next routine visit, a check for fresh eggs will confirm this is a normal seasonal contraction.
🌅 Diurnal Cycle PatternsHive #1 shows active 24h temperature cycles averaging 5.9°F (3.3°C) daily swing (78.3–84.5°F / 25.8–29.2°C), consistent with a colony in a reduced-brood state riding late-summer ambient warmth, with 15/15 days showing clear vibration activity peaks (baseline ~15.9 mG rising to ~22.9 mG, avg 1.4×). The vibration dominant rhythm band shifted from 5–20 Hz toward 80–120 Hz between the first and second halves — consistent with a seasonal transition from low-frequency DVAV signaling toward higher-frequency fanning activity as late-summer temperatures build through the day. The gas heater-scan shows a strong 100°C-led daily cycle (+35% swing, all 10 steps cycling), which tracks humidity's own diurnal rhythm as expected from MOX temperature-moisture confounding — the scan shape (steeply falling 100→320°C, gradual tail 350→400°C) is consistent with this hive's own history.
🔬 Correlations & Discoveriesgas_resistance vs temperature_in (14d) | r = -0.83The strong partial correlation r=−0.83 (gas resistance vs in-hive temp, controlling for outdoor temperature) reflects a hive-specific thermodynamic coupling: as the colony warms and fanning increases, VOC circulation intensifies and apparent gas resistance falls; this is a healthy metabolic signature linking thermoregulatory effort to volatile load, not a stress signal — both channels are well within Hive #1's own historical norms.📚 Reference: Burgues & Marco 2018, Stabentheiner et al. 2010, Maisonnasse et al. 2010humidity_in vs gas_resistance (14d) | r = +0.45The genuine r=+0.45 humidity–gas coupling mirrors the pattern seen in Iris: water vapor's direct effect on the SnO2 sensing layer shifts apparent resistance in concert with humidity, independent of any VOC change — a sensor-physics relationship confirmed by the stable gas resistance sitting right on Hive #1's all-time average of 508 kΩ.📚 Reference: Burgues & Marco 2018, Ellis & Delaplane 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 (84.2→81.6°F / 29.0→27.5°C) reflects a natural late-summer brood contraction — the acoustically intact population (all bands within ±0.1 dB of baseline) is fully reassuring and there is no urgency. -
Hive #3 healthy Score: 83/100📋 Overall Health
Your Hive #3 continues its excellent run — the 24h average of 90.9°F (32.7°C) sits 1.5°F (0.9°C) below the all-time average of 92.4°F (33.6°C), continuing a gentle and entirely normal seasonal tail-off (93.2→92.5→91.8°F weekly), with all 10 acoustic bands within ±0.2 dB of their historical baseline — a textbook-stable fingerprint confirming a fully intact population. Humidity at 48.2% is healthy and on-baseline (all-time avg 47.1%), gas resistance at 91 kΩ is right on its all-time average of 93 kΩ, and vibration at 20.5 mG (kurtosis 2.8, peak 59 Hz) sits on its all-time average of 20.8 mG — the battery touched 3,982 mV (its all-time low) within the 24h window, worth monitoring passively as solar input decreases into autumn.
🌅 Diurnal Cycle PatternsHive #3 shows moderate 24h temperature cycles averaging 3.3°F (1.8°C) daily swing (88.9–92.5°F / 31.6–33.6°C) — the tightest thermal regulation among the three non-brood-clamping hives — with 15/15 days showing strong vibration activity peaks (baseline ~19.4 mG rising to ~34.6 mG, avg 1.8×) and the broadest vibration daily cycles in the apiary (5–20 Hz band: 4.0 dB daily amplitude), likely reflecting active foraging and DVAV recruitment signaling. Gas heater-scan shows no strong per-band daily rhythm (max 300°C step +9% swing), consistent with a stable, low-VOC environment; the scan shape (steep 100→320°C fall, mild upturn 375–400°C) matches this hive's own baseline and is a normal propolis/brood-pheromone profile.
🔬 Correlations & Discoveriestemperature_in vs humidity_in vs gas_resistance (14d) | r = +0.48The PCA colony-state index for Hive #3 is rising, with temperature, humidity, and gas resistance as dominant channels — the r=+0.48 (temp–gas) and r=+0.59 (temp–humidity) couplings together describe a healthy, metabolically active colony where warming drives both humidity modulation and VOC circulation in a coordinated way that is consistent with sustained late-summer foraging and brood maintenance near 90.9°F (32.7°C).📚 Reference: Human, Nicolson & Dietemann 2006, Maisonnasse et al. 2010, Stabentheiner et al. 2010▹ Action: Monitor Hive #3's battery passively — it touched its all-time low of 3,982 mV within the last 24 hours (currently 4,006 mV); no action needed yet, but keep an eye on the trend as solar input decreases heading into autumn.