As of September 4, 2026, your apiary is in good early-autumn shape — Iris, Hive #1, and Hive #3 all show acoustically intact populations on a natural seasonal cooling arc, while Hive #2 remains the one hive to watch, its broad-spectrum acoustic step-down now at 23 days with the low-frequency daily rhythm still absent, though its brood temperature continues to hold a textbook 94.8°F (34.9°C).
A striking apiary-wide pattern this week: the three acoustically-stable hives (Iris, Hive #1, Hive #3) all show a deconfounded positive coupling between in-hive temperature and humidity (r=+0.41–0.59), reflecting the psychrometric relationship between metabolic heat generation and moisture load — a shared physiological signature of active, well-regulated colonies that is conspicuously absent in the weakened acoustic profile of Hive #2.
Against outdoor swings of 64.9–87.6°F (18.3–30.9°C) at 21–47% RH and a gently rising barometric tendency (+0.50 hPa/3h — settled, clearing conditions), all four hives show consistent daily vibration rhythms and in-hive humidity tracking in the 41–49% range, fully consistent with the dry ambient and well within safe ventilation parameters with no condensation risk.
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Iris healthy Score: 80/100📋 Overall Health
Your Iris hive is in excellent shape — the 24h average of 88.2°F (31.2°C) sits right on its all-time average of 88.2°F (31.2°C), and all 10 acoustic bands are within ±0.5 dB of their historical baseline, confirming a fully intact worker population on a normal late-summer trajectory. Humidity at 41.0% is consistent with the very dry ambient (outdoor 21–47% RH), gas resistance at 478 kΩ is slightly above the all-time average of 454 kΩ (clean air), and vibration at 16.5 mG (kurtosis 2.8, peak 55 Hz) is on-baseline — watch for the gentle continued seasonal cooling as September progresses.
🌅 Diurnal Cycle PatternsA healthy 4.8°F (2.7°C) daily temperature oscillation with clear diurnal fanning rhythm (14/15 days showing peaks rising to ~24.5 mG); all 6 vibration bands show a daily cycle with a dominant shift from 5–20 Hz to 50–80 Hz in the second half of the window — consistent with the seasonal transition from DVAV recruitment signalling toward fanning-dominated activity as late-summer foraging demand shifts. Gas heater-scan shows a daily rhythm strongest at 150°C (±19% swing), with the dominant rhythm step shifting from 100°C to 150°C — a minor seasonal drift in the colony's VOC fingerprint, likely reflecting changing propolis and honey-ripening chemistry; humidity is steady at ~41%, tracking the dry ambient without any concern.
🔬 Correlations & Discoveriestemperature_in vs humidity_in (14d) | r = +0.44The deconfounded positive coupling between in-hive temperature and humidity (r=+0.44, p<1e-22) reflects normal colony metabolic physiology: as the cluster generates heat through brood incubation and fanning, metabolic water vapor rises proportionally — a healthy, active brood-rearing signature. The outdoor temperature leads in-hive by ~90 minutes (thermal-mass buffering), confirming the colony is actively damping ambient swings rather than passively tracking them.📚 Reference: Human, Nicolson & Dietemann 2006, Eouzan et al. 2019 (PMC6368279), Stalidzans et al. 2017humidity_in vs gas_resistance (14d) | r = +0.43The positive humidity–gas resistance coupling (r=+0.43) reflects a well-known MOX sensor physics effect: rising humidity partially passivates the SnO2 sensing layer, increasing apparent resistance independent of VOC load — so when metabolic moisture rises with colony activity, the sensor reads slightly higher resistance. This is a sensor-physics artifact of a healthy, active colony, not a chemistry event.📚 Reference: Burgues & Marco 2018, Sensors 18(2):339, Winston 1987, Bankova et al. 2000, Apidologie▹ Action: On your next routine visit, do a quick check of Iris's brood frames for fresh eggs — the 14-day cooling arc from 89.1°F (31.7°C) to 88.2°F (31.2°C) is entirely consistent with a natural late-summer brood contraction, and the perfectly stable acoustics confirm the population is fully present. -
Hive #2 warning Score: 58/100📋 Overall Health
Your Hive #2 brood temperature remains locked at a textbook 94.8°F (34.9°C) — a razor-tight 1.9°F (1.1°C) daily arc essentially on its all-time average of 94.9°F (34.9°C) — confirming excellent active thermoregulation and an intact brood nest; however, the broad-spectrum acoustic step-down that began around August 25th is now at 23 days, with overall sound holding at −16.6 dBFS versus the all-time average of −12.7 dBFS (a −3.9 dBFS deviation), and the 100–150 Hz band remains −8.5 dB below baseline with its daily low-frequency rhythm still absent. Humidity at 46.9% is healthy and on-baseline, gas at 43 kΩ is near its all-time average of 49 kΩ, and vibration at 13.9 mG (kurtosis 2.8, peak 60 Hz) is near its all-time average of 14.9 mG — the combination of locked thermoregulation with a persistent, non-recovering multi-band acoustic step-down (now 23 days, no sign of improvement) warrants a visual confirmation at your next routine inspection this week.
🌅 Diurnal Cycle PatternsThe 2.2°F (1.2°C) daily temperature oscillation is tight and consistent with excellent brood-zone thermoregulation; vibration shows a strong daily rhythm (15/15 days, peaking at ~50.1 mG — 4× baseline) with the dominant rhythm shifting from 50–80 Hz to 80–120 Hz, consistent with active fanning continuing strongly. Critically, the per-band sound spectral evolution shows the low-frequency daily rhythms in 100–150 Hz and 150–200 Hz have collapsed from 9.5 dB and 6.8 dB swings respectively to near-zero over the window — the fanning and flight-band acoustics remain, but the colony's characteristic low-frequency vocal activity has gone quiet. Gas heater-scan shows no strong daily rhythm (max 9% swing at 280°C), consistent with stable metabolic conditions.
🔬 Correlations & Discoveriessound_energy vs sound_spectrum_100_150hz (14d) | r = -0.71The changepoint-confirmed acoustic step-down (−6.17 dB around August 25, now 23 days sustained) with pronounced low-frequency band loss (100–150 Hz down −8.5 dB, daily rhythm collapsed from 9.5 dB to ~0 dB) is the most diagnostically significant signal in this apiary; the preserved brood thermoregulation and vibration activity confirm the bees are present and metabolically active, but the characteristic low-band colony vocal signature has diminished — a pattern that warrants a physical inspection to confirm queen presence and brood status.📚 Reference: Ramsey, Bencsik, Newton et al. 2020, Sci. Rep. 10:9798, Kanelis et al. 2023, Biology 12(11):1392, Woods 1959temperature_in vs gas_resistance (14d) | r = +0.48The deconfounded positive in-hive temp–gas resistance coupling (r=+0.48) in Hive #2 is consistent with normal brood metabolic physiology: warmer cluster conditions produce more circulating volatiles (propolis, brood pheromones, honey ripening) that lower MOX resistance, while the humidity–MOX passivation effect partially offsets this — the overall gas reading near its historical average confirms no unusual VOC environment despite the acoustic anomaly.📚 Reference: Stalidzans et al. 2017, Seeley 1974, J. Insect Physiol. 20:2301, Burgues & Marco 2018⚠️ Issue: Sustained 23-day multi-band acoustic step-down: overall sound −16.6 dBFS vs all-time average −12.7 dBFS (−3.9 dBFS); 100–150 Hz band −8.5 dB below baseline; low-frequency daily rhythm collapsed (100–150 Hz: 9.5→0 dB swing); 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, then check brood frames for fresh eggs and queen presence — the 23-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 that whatever has changed, the bees are actively caring for brood. -
Hive #1 healthy Score: 77/100📋 Overall Health
Your Hive #1 continues its gradual and acoustically-confirmed-benign cooling drift — the 24h average of 82.9°F (28.3°C) extends the 14-day decline from 86.1°F (30.1°C), now 1.4°F (0.7°C) below the all-time average of 84.3°F (29.0°C), and 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 this reflects a natural late-summer brood contraction. Humidity at 44.3% is slightly above its all-time average of 40.7% but well within the healthy range, gas resistance at 531 kΩ is slightly above its all-time average of 512 kΩ (clean, stable air), and vibration at 16.4 mG (kurtosis 2.6, peak 61 Hz) sits right on its all-time average of 16.3 mG — a check for fresh eggs at your next routine visit will confirm this seasonal trajectory.
🌅 Diurnal Cycle PatternsA 5.7°F (3.2°C) daily temperature oscillation with a clear daily fanning rhythm (14/15 days, typical baseline 15.9 mG rising to 22.6 mG); the dominant vibration rhythm shifted from 5–20 Hz to 80–120 Hz between the window halves, mirroring the transition seen in Iris and consistent with a seasonal shift in colony activity patterns. The gas heater-scan shows a strong daily rhythm across all 10 steps (strongest at 100°C, ±35% swing), with the dominant rhythm step shifting from 150°C to 100°C — the large low-temperature step swing reflects humidity's diurnal influence on the MOX sensor at cooler plate temperatures, a sensor-physics effect rather than a VOC change. Humidity is steady at ~44%, consistent with dry ambient conditions and no condensation concern.
🔬 Correlations & Discoveriesgas_resistance vs temperature_in (14d) | r = -0.83The strong partial correlation of gas resistance vs. in-hive temperature controlling for outdoor temperature (r=−0.83) is the strongest hive-specific gas coupling in the apiary: as the colony warms during peak foraging hours, fanning increases circulation of propolis terpenes, brood pheromones, and honey volatiles, depressing MOX resistance — a direct fingerprint of metabolic activity gating the colony's VOC environment. This is a healthy, active-colony signal.📚 Reference: Burgues & Marco 2018, Sensors 18(2):339, Bankova et al. 2000, Apidologie, Maisonnasse et al. 2010, PLoS ONEhumidity_in vs gas_resistance (14d) | r = +0.45The positive humidity–gas resistance coupling (r=+0.45) reflects the same MOX passivation physics seen across the apiary: higher humidity partially blocks reactive sites on the SnO2 layer, raising apparent resistance — when combined with the strong negative temp–gas partial correlation, this confirms the gas channel in Hive #1 is faithfully encoding colony metabolic state rather than any external VOC event.📚 Reference: Burgues & Marco 2018, Sensors 18(2):339, Ellis et al. 2008, J. Insect Physiol. 54:1516▹ Action: On your next routine visit, check Hive #1's brood frames for fresh eggs to confirm the 14-day cooling drift (86.1→82.9°F / 30.1→28.3°C) reflects a natural late-summer brood contraction — the acoustically perfect spectral match (all bands within ±0.1 dB of baseline) is fully reassuring and there is no urgency. -
Hive #3 healthy Score: 79/100📋 Overall Health
Your Hive #3 continues its excellent run — the 24h average of 91.2°F (32.9°C) sits 1.1°F (0.6°C) below the all-time average of 92.3°F (33.5°C), continuing a gentle and entirely normal seasonal tail-off (93.4→92.5→91.6→92.1°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 45.5% is healthy and near on-baseline (all-time avg 47.0%), gas resistance at 93 kΩ is right on its all-time average of 93 kΩ, and vibration at 20.4 mG (kurtosis 2.9, peak 94 Hz) is on its all-time average of 20.7 mG — the battery dipped to 3,980 mV (touching its all-time low of 3,982 mV) during the 24h window, worth monitoring passively as September solar input declines.
🌅 Diurnal Cycle PatternsA 2.7°F (1.5°C) daily temperature oscillation — notably the tightest of all four hives — with a strong daily vibration rhythm (14/15 days, peaks reaching ~34.1 mG, 1.8× baseline); the 5–20 Hz vibration rhythm has weakened from 4.0 dB to 2.0 dB over the window, a gradual reduction in low-frequency substrate activity consistent with natural late-summer colony quieting rather than any acute change. No strong per-band gas or sound daily rhythms, consistent with a settled, stable colony environment. Humidity is steady at ~45.5% and tracking the dry ambient with no condensation risk.
🔬 Correlations & Discoveriestemperature_in vs humidity_in (14d) | r = +0.59Hive #3 shows the strongest temperature–humidity coupling in the apiary (r=+0.59, p<2e-54, eff_n=566), reflecting the tightest metabolic homeostasis: as heater bees elevate the brood zone temperature, the proportional rise in metabolic water vapor is precisely co-regulated — a signature of a large, well-populated colony with robust thermoregulatory capacity. The outdoor temperature leads in-hive by ~250 minutes, the longest thermal lag in the apiary and indicative of excellent cluster insulation.📚 Reference: Human, Nicolson & Dietemann 2006, Naturwissenschaften 93:397, Eouzan et al. 2019 (PMC6368279), Stabentheiner, Kovac & Brodschneider 2010, PLoS ONE 5(1):e8967temperature_in vs gas_resistance (14d) | r = +0.47The positive deconfounded temperature–gas resistance coupling (r=+0.47) in Hive #3 is consistent with the humidity-passivation mechanism: warmer cluster conditions co-vary with higher metabolic moisture, which slightly raises MOX resistance — the gas baseline sitting right on its all-time average of 93 kΩ confirms no unusual VOC environment, just a healthy colony's normal chemistry.📚 Reference: Burgues & Marco 2018, Sensors 18(2):339, Maisonnasse et al. 2010, PLoS ONE 5(10):e13531, Bankova et al. 2000, Apidologie 31:3–15▹ Action: Monitor Hive #3's battery passively — it touched 3,980 mV during the last 24 hours, at its all-time low of 3,982 mV; no action needed yet, but keep an eye on the trend as September solar input continues to decrease.