As of September 5, 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 24 days with brood thermoregulation locked at a textbook 94.8°F (34.9°C). The gently easing barometric tendency (−0.46 hPa/3h) is mild and not actionable on its own.
Across all four hives, the deseasonalized analytics consistently surface a positive in-hive temperature–humidity coupling (r ≈ +0.50–0.58) — a physiological signature of active brood-nest hygroregulation where warmer core zones retain proportionally more moisture, consistent with Eouzan et al. 2019 and Human et al. 2006. The one outlier is Hive #2, whose PCA colony-state index is driven by vibration and kurtosis rather than the temperature–humidity axis shared by the other three hives, hinting at a subtly different colony dynamic worth watching.
Against outdoor swings of 64.5–86.7°F (18.1–30.4°C) at 26–45% RH, all four hives are showing consistent daily vibration fanning rhythms and in-hive humidity holding in the 41–50% range — fully consistent with the dry September ambient and well within safe ventilation parameters with no condensation risk. Hive #2 is the lone exception to the otherwise healthy diurnal acoustic pattern, with its per-band daily rhythm essentially absent in the low-frequency sound bands for the past 24 days.
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Iris healthy Score: 80/100📋 Overall Health
Your Iris hive continues in excellent shape — the 24h average of 86.9°F (30.5°C) sits right on its all-time average of 88.1°F (31.2°C), and all 10 acoustic bands are within ±0.8 dB of their historical baseline (overall sound averaging −11.2 dBFS vs. all-time −10.9 dBFS), confirming a fully intact worker population. Humidity at 41.1% is consistent with the dry ambient (outdoor 26–45% RH), gas resistance at 466 kΩ is slightly above the all-time average of 454 kΩ (clean air), and vibration at 17.1 mG (kurtosis 2.6, peak 53 Hz) is right on its all-time average of 17.3 mG — the gentle 14-day cooling arc from 89.1°F to 86.9°F (31.7→30.5°C) is entirely a natural late-summer brood contraction, and a quick check for fresh eggs at your next routine visit will confirm it.
🌅 Diurnal Cycle PatternsActive daily temperature cycle of +4.9°F (+2.7°C) with a clear daily peak tracking the outdoor phase — the deseasonalized analysis shows the outdoor signal leads in-hive by ~90 min (thermal-mass buffering, a sign of health). Vibration shows a robust daily fanning rhythm (14 of 15 days peaking ~1.5× baseline, dominant band 80–120 Hz), and the 200–260 Hz acoustic band carries the strongest daily rhythm at 2.6 dB — a healthy foraging/waggle-dance correlate. The gas heater-scan daily rhythm has shifted its dominant step from 100°C to 150°C in the second half of the window, consistent with a modest change in heavier volatile load (possibly late-season propolis or honey ripening) rather than any colony stress signal.
🔬 Correlations & Discoveriestemperature_in vs humidity_in (14d) | r = +0.51Warmer moments inside Iris correspond to slightly higher RH — a psychrometric signature of active hygroregulation where the colony's metabolic heat output and moisture production move together, not a drying or condensation concern (Eouzan et al. 2019). The positive residual coupling after removing the shared diurnal cycle confirms this is genuine hive physiology, not a weather artifact.📚 Reference: Eouzan et al. 2019 (PMC6368279), Human, Nicolson & Dietemann 2006humidity_in vs gas_resistance (14d) | r = +0.47Higher in-hive humidity co-varies with higher gas resistance (lower VOC load) on a deseasonalized basis — consistent with water vapor independently raising MOX resistance, and the fact that active fanning (which disperses volatiles and lowers RH) drives both channels in the same direction (Winston 1987; Burgues & Marco 2018). No colony-stress interpretation is warranted.📚 Reference: Winston 1987, Burgues & Marco 2018▹ Action: On your next routine visit, do a quick check of Iris's brood frames for fresh eggs to confirm the 14-day cooling arc from 89.1°F to 86.9°F (31.7→30.5°C) reflects a natural late-summer brood contraction — the perfectly stable acoustics confirm the full population is present. -
Hive #2 warning Score: 57/100📋 Overall Health
Your Hive #2 brood temperature remains locked at a textbook 94.8°F (34.9°C) — a razor-tight 1.4°F (0.8°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 24 days, with overall sound holding at −16.6 dBFS versus the all-time average of −13.2 dBFS (a −3.4 dBFS deviation), and the low-frequency bands remain significantly below baseline (100–150 Hz: −7.7 dB, 1500–3600 Hz: −6.1 dB below baseline). Humidity at 47.9% is healthy and slightly above its all-time average of 46.5%, gas resistance at 42 kΩ is near its all-time average of 48 kΩ, and vibration at 14.0 mG (kurtosis 3.1, peak 113 Hz) is near its all-time average of 14.9 mG — the continued combination of locked thermoregulation with a persistent, non-recovering multi-band acoustic step-down (now 24 days) warrants a visual confirmation at your next routine inspection this week.
🌅 Diurnal Cycle PatternsBrood temperature is superbly clamped at ±0.9°F (0.5°C) daily — hallmark active broodnest regulation. Vibration shows a robust daily fanning rhythm (15 of 15 days, peaking ~4.0× baseline at ~49.8 mG, dominant band 80–120 Hz and 5–20 Hz), confirming a physically active and present colony. However, the per-band sound analysis shows essentially no daily rhythm remaining in the 100–150 Hz and 800–1500 Hz bands (daily swing collapsed from 4.6 dB → 1.0 dB and 3.0 dB → 1.0 dB respectively over the 14-day window), and the gas scan shows only a single band (100°C step) with a meaningful daily rhythm (+14% swing) — the gas scan shape is uniformly low-resistance from 100°C through 400°C, consistent with a moderately elevated VOC environment that tracks the brood nest metabolic activity rather than any alarming chemistry.
🔬 Correlations & Discoveriestemperature_in vs gas_resistance (14d) | r = +0.49After removing the shared diurnal cycle, warmer brood-nest moments in Hive #2 co-vary with higher gas resistance — physically, a warmer brood nest drives more fanning, which ventilates VOCs outward and raises resistance; or alternatively, higher metabolic activity (more brood pheromones, more E-β-ocimene) tracks temperature rises (Maisonnasse et al. 2010). The relationship confirms the gas channel is responding to genuine colony metabolic activity, not a sensor artifact.📚 Reference: Maisonnasse et al. 2010, Stalidzans et al. 2017sound_spectrum_low_bands vs temperature_in (14d) | r = -0.65The sustained −7.7 dB step-down in the 100–150 Hz band (and −6.1 dB in 1500–3600 Hz) since ~August 25th, while brood temperature has remained perfectly locked at 94.8°F (34.9°C), is the most informative signal in the apiary: it rules out population collapse (which would cause thermoregulation to fail) but is consistent with a reduction in forager flight activity and low-frequency communication signals (Kanelis et al. 2023), possibly reflecting a natural late-summer forager population decline or a change in colony composition — physical inspection to observe entrance traffic and confirm queen/brood status will resolve it.📚 Reference: Kanelis et al. 2023 (Biology 12(11):1392), Ramsey et al. 2020⚠️ Issue: Sustained 24-day multi-band acoustic step-down: overall sound −16.6 dBFS vs. all-time average −13.2 dBFS (−3.4 dBFS); 100–150 Hz band −7.7 dB below baseline, 1500–3600 Hz −6.1 dB below baseline; low-frequency daily acoustic rhythm collapsed; 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 24-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: 78/100📋 Overall Health
Your Hive #1 continues its gradual and acoustically-confirmed-benign cooling drift — the 24h average of 81.8°F (27.7°C) extends the 14-day decline from 86.7°F (30.4°C) to 81.8°F (27.7°C), now 2.3°F (1.3°C) below the all-time average of 84.1°F (28.9°C), and all 10 acoustic bands remain within ±0.3 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 45.3% is slightly above its all-time average of 41.0% but well within the healthy range, gas resistance at 527 kΩ is slightly above its all-time average of 513 kΩ (clean, stable air), and vibration at 16.4 mG (kurtosis 3.3, peak 76 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 PatternsActive daily temperature cycle of +6.4°F (+3.5°C) — the widest swing in the apiary — with outdoor leading in-hive by ~220 min, confirming healthy thermal buffering at this cooler operating temperature. Vibration shows a clear daily fanning rhythm (14 of 15 days, typical baseline ~15.9 mG rising to ~22.8 mG, dominant band 80–120 Hz). The gas heater-scan shows a striking strengthening daily rhythm across all 10 steps (100°C swing strengthening from +24% to +41% in the second half of the window), consistent with diurnal propolis/volatile cycling becoming more pronounced as temperatures cool — a seasonal metabolic pattern, not a stress signal.
🔬 Correlations & Discoverieshumidity_in vs gas_resistance (14d) | r = +0.45In Hive #1, higher in-hive humidity co-varies with higher gas resistance (lower VOC load) after deseasonalization — the same water-vapor/MOX-resistance coupling seen in Iris, confirming the gas channel is responding to moisture physics rather than pathological chemistry (Burgues & Marco 2018). The partial correlation gas_resistance ~ temperature | outdoor temp = −0.83 is the strongest in the apiary, meaning warmer-than-expected moments drive VOC-loading increases independently of the weather — consistent with fanning-driven propolis and honey-ripening volatile circulation.📚 Reference: Burgues & Marco 2018, Winston 1987▹ Action: On your next routine visit, check Hive #1's brood frames for fresh eggs to confirm the 14-day cooling drift (86.7→81.8°F / 30.4→27.7°C) reflects a natural late-summer brood contraction — the acoustically perfect spectral match (all bands within ±0.3 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 90.4°F (32.4°C) sits 1.8°F (1.0°C) below the all-time average of 92.2°F (33.4°C), continuing a gentle and entirely normal seasonal tail-off (93.2→92.5→91.6→91.4°F weekly), with all 10 acoustic bands within ±0.1 dB of their historical baseline — a textbook-stable fingerprint confirming a fully intact population. Humidity at 46.7% is healthy and near on-baseline (all-time avg 46.8%), gas resistance at 95 kΩ is right on its all-time average of 93 kΩ, and vibration at 20.5 mG (kurtosis 2.7, peak 77 Hz) is on its all-time average of 20.7 mG — the battery dipped to a minimum of 3,984 mV during the 24h window, essentially touching its all-time low of 3,980 mV, worth monitoring passively as September solar input declines.
🌅 Diurnal Cycle PatternsActive daily temperature cycle of +3.6°F (+2.0°C) with outdoor leading by ~160 min, reflecting healthy thermal buffering. Vibration shows a robust daily fanning rhythm across all 6 bands (14 of 15 days, typical baseline ~19.4 mG rising to ~34.0 mG, with the dominant rhythm band shifting from 5–20 Hz to 50–80 Hz in the second half — consistent with a seasonal transition from low-frequency colony movement toward higher-frequency fanning as daily peaks warm). The gas heater-scan shows no strong daily rhythm (max +9% swing at 300°C), consistent with a stable, well-ventilated hive environment with modest VOC cycling.
🔬 Correlations & Discoveriestemperature_in vs humidity_in vs gas_resistance (14d) | r = +0.58Hive #3 shows the strongest temperature–humidity coupling in the apiary (r=+0.58, p=8.5e-53), alongside a significant temperature–gas-resistance coupling (r=+0.49) — together these describe a well-regulated brood nest where metabolic warming drives proportional moisture production and VOC circulation, consistent with active brood pheromone and propolis volatile dynamics in a healthy late-summer colony (Eouzan et al. 2019; Maisonnasse et al. 2010). This trio of coupled channels is the physiological signature of strong, active brood rearing.📚 Reference: Eouzan et al. 2019 (PMC6368279), Maisonnasse et al. 2010, Human et al. 2006▹ Action: Monitor Hive #3's battery passively — it touched 3,984 mV during the last 24 hours, at its all-time low of 3,980 mV; no action needed yet, but keep an eye on the trend as September solar input continues to decrease.