As of September 17, 2026, your four-hive apiary continues its healthy September arc — all hives are acoustically and vibrationally on their own baselines, outdoor air remains exceptionally clean (~743 kΩ gas resistance), and the gently rising barometric tendency (+0.45 hPa/3h) signals improving foraging conditions. The gradual cooling visible across Iris, Hive #1, and Hive #3 is a consistent seasonal contraction pattern confirmed benign by fully intact acoustic populations on every hive.
A coordinated temperature and humidity step-change appeared around September 13–14 across Hive #1, Hive #2, and Hive #3 simultaneously — a strong apiary-wide signal of a regional weather shift rather than any colony-specific event, consistent with autumn frontal passage compressing the ambient diurnal envelope (Southwick & Moritz 1987).
All four hives maintain clear 24-hour vibration fanning rhythms with 80–120 Hz as the dominant band; Hive #2 leads fanning intensity at 4.0× daily peaks and Hive #3 at 1.8×. In-hive humidity across the apiary has stepped up modestly since mid-September (now 45–54% range) tracking the seasonal ambient rise, well within healthy bounds and consistent with comb-buffered hygroregulation (Eouzan et al. 2019).
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Iris healthy Score: 80/100📋 Overall Health
Your Iris hive is active and healthy — the 24h average of 83.9°F (28.8°C) continues the gradual 14-day cooling arc (−4.3°F / −2.4°C) that is fully consistent with a natural September brood contraction, and the worker population is confirmed present by a perfectly stable acoustic spectrum (all 10 bands within ±0.8 dB of baseline, overall −10.9 dBFS matching the all-time average exactly) and vibration at 16.9 mG (kurtosis 2.7, peak 80 Hz) on the all-time average of 17.3 mG. Humidity at 44.9% is appropriate for dry September ambient, gas resistance at ~436 kΩ is near the all-time average of ~461 kΩ with no acoustic corroboration of concern, and the step-up in humidity around September 14 (+2.79%) mirrors the apiary-wide weather shift. On your next routine visit, a glance at brood frames for fresh eggs will confirm whether the cooling arc reflects a natural seasonal contraction or a brief brood-break period.
🌅 Diurnal Cycle PatternsThe 24h temperature swing of 3.4°F (1.9°C) — from 82.3°F (28.0°C) to 85.7°F (29.8°C) — is well-clamped and consistent with active thermoregulation; the 14-of-15-day fanning rhythm (baseline ~16.5 mG rising to ~24.6 mG peaks, avg 1.5×) is intact and regular. The per-band spectral analysis notes the dominant acoustic rhythm shifting from 200–260 Hz to 1500–3600 Hz in the second half of the window (with 1500–3600 Hz strengthening from 1.0 to 3.0 dB rhythm amplitude) — this is consistent with increased high-frequency wingbeat/foraging activity as September days warm, and not a colony-state concern. The gas heater-scan dominant rhythm shifted from 100°C to 150°C steps, which tracks humidity-driven MOX response (the low-temperature steps are most humidity-sensitive), fully explained by the September 14 humidity step-change.
🔬 Correlations & Discoveriestemperature_in vs humidity_in (14d) | r = +0.84The strong deconfounded r=+0.84 between in-hive temperature and humidity in Iris reflects the psychrometric relationship inside the nest: as the brood zone warms during active thermoregulation, the same absolute water vapour reads as a higher RH%, and as the seasonal September cooling arc lowers the daily temperature baseline, RH rises at constant absolute moisture content — both are passive thermodynamic effects of a well-regulated colony, not a ventilation problem.📚 Reference: Eouzan et al. 2019 (PLOS ONE / PMC6368279), Human, Nicolson & Dietemann 2006, Ellis et al. 2008humidity_in vs gas_resistance (14d) | r = +0.42The modest r=+0.42 coupling between humidity and gas resistance in Iris is explained by MOX sensor physics: elevated water vapour at the low-temperature heater steps (100–200°C) partially blocks reaction sites and raises apparent resistance, so the September 14 humidity step-up produced a correlated gas-resistance uptick — a moisture-artifact on the sensor, not a change in hive VOC chemistry.📚 Reference: Burgues & Marco 2018, Sensors 18(2):339, Winston 1987, Human et al. 2006▹ Action: On your next routine visit, glance at Iris's brood frames for fresh eggs to confirm whether the gradual 14-day cooling arc reflects a natural seasonal brood contraction or a brief brood-break period — the fully stable acoustics confirm the worker population is present and active. -
Hive #2 healthy Score: 93/100📋 Overall Health
Your Hive #2 remains the standout performer in the apiary — brood thermoregulation is textbook at a 24h average of 92.4°F (33.5°C) with a ±1.4°F (±0.8°C) daily arc, squarely inside the ideal 93–97°F (34–36°C) band and the tightest clamping across all four hives despite the gentle 14-day cooling drift (−2.4°F / −1.3°C). All 10 acoustic bands are within 0.2 dB of their all-time baseline (overall −16.6 dBFS vs. all-time −16.6 dBFS), humidity at 44.5% is appropriate for dry September conditions, gas resistance at ~44 kΩ sits right on its all-time average of ~44 kΩ, and vibration at 15.2 mG (kurtosis 2.9, peak 71 Hz) is on the all-time average of 14.8 mG. Everything looks excellent heading into autumn.
🌅 Diurnal Cycle PatternsThe vibration rhythm is the strongest in the apiary — all 6 bands show daily cycles, with 80–120 Hz carrying the dominant 5.9 dB daily swing (15-of-15 days, peaks reaching ~50.4 mG, avg 4.0× baseline), a clear signature of vigorous thermoregulatory fanning. The per-band acoustic analysis notes 800–1500 Hz and 1500–3600 Hz rhythms strengthening (both from 0 to 2.0 dB amplitude) in the second half of the window — consistent with increasing high-frequency foraging/wingbeat activity as September days become milder and foraging windows widen. The gas heater-scan dominant rhythm shifted from 100°C to 150°C steps, mirroring the apiary-wide September 14 humidity step-change as a MOX moisture artifact rather than a VOC event.
🔬 Correlations & Discoveriestemperature_in vs humidity_in vs gas_resistance (14d) | r = +0.94The exceptionally tight three-way deconfounded coupling (temp–humidity r=+0.94, temp–gas r=+0.84, humidity–gas r=+0.78) in Hive #2 is the strongest in the apiary and reflects a well-insulated, metabolically coherent brood nest: temperature, absolute moisture, and MOX-detected VOC load all rise and fall together as the colony's thermoregulatory effort varies — tight brood-nest physiology producing a correlated microclimate fingerprint, a sign of colony health, not a concern.📚 Reference: Eouzan et al. 2019 (PLOS ONE / PMC6368279), Burgues & Marco 2018, Sensors 18(2):339, Stalidzans et al. 2017vibration vs vibration_kurtosis (14d) | r = -0.4The r=−0.40 inverse coupling between vibration RMS and kurtosis in Hive #2 indicates that when overall vibration amplitude is high (peak fanning bouts), the signal is smooth and periodic (kurtosis falls toward 2); when the colony is quieter, occasional impulsive events (brief disturbances, landing bees) push kurtosis upward — a normal pattern for a healthy colony alternating between organised fanning activity and ambient background noise.📚 Reference: Ramsey, Bencsik, Newton et al. 2020, Sci. Rep. 10:9798, Nieh & Tautz 2000▹ Action: Hive #2 looks excellent — on your next routine visit, a quick entrance observation and brood-frame check for fresh eggs will close the loop on three weeks of stable telemetry and confirm the colony is building winter stores on schedule. -
Hive #1 healthy Score: 78/100📋 Overall Health
Your Hive #1 is acoustically rock-solid — all 10 sound bands are within ±0.2 dB of the all-time baseline (overall −16.4 dBFS vs. all-time −16.4 dBFS) and vibration at 16.7 mG (kurtosis 3.0, peak 72 Hz) is right on its all-time average of 16.4 mG, confirming a full, active worker population despite the 24h average of 79.7°F (26.5°C) sitting 2.8°F (1.5°C) below the all-time average — this is consistent with a natural seasonal brood contraction as September advances, with the stable acoustics ruling out population loss. Humidity at 51.6% is above the all-time average of 44.1% following the September 13 step-change (+3.11%), still well within the healthy 50–70% range, and gas resistance at ~485 kΩ is near its all-time average of ~526 kΩ with no acoustic corroboration of concern. On your next routine visit, confirm fresh eggs in the brood frames.
🌅 Diurnal Cycle PatternsThe 24h temperature swing of 5.8°F (3.2°C) — from 76.6°F (24.8°C) to 82.4°F (28.0°C) — is the widest among the four hives but still reflects Hive #1's placement characteristic and the September ambient cycle, with all 6 vibration bands showing daily rhythms (dominant 5–20 Hz at 3.0 dB, 14-of-15 days, peaks ~23.2 mG from ~15.8 mG baseline). The gas heater-scan shows the strongest daily rhythms in the apiary (10/10 bands, 100°C at +41% swing) but the rhythm amplitude is weakening in the second half of the window (100°C: +48% → +24%, 250°C: +35% → +14%), consistent with the post-September-13 humidity step reducing the differential moisture load that was driving gas-scan variability — a benign settling of the microclimate, not a colony event.
🔬 Correlations & Discoveriestemperature_in vs humidity_in (14d) | r = +0.85The deconfounded r=+0.85 between in-hive temperature and humidity in Hive #1, combined with the September 13 humidity step-change (+3.11%) coinciding with the 14-day cooling drift, reflects a seasonal psychrometric shift: as the colony's thermoregulatory heat output gradually decreases with cooling autumn temperatures and a contracting brood nest, the absolute moisture level in the hive remains relatively stable but reads as a higher RH% at lower temperatures — the humidity step is the temperature drop seen through the psychrometric lens, not a ventilation change.📚 Reference: Eouzan et al. 2019 (PLOS ONE / PMC6368279), Human, Nicolson & Dietemann 2006, Ellis et al. 2010humidity_in vs gas_resistance (14d) | r = +0.59The r=+0.59 humidity–gas coupling in Hive #1 (with partial correlation gas–temp controlling for outdoor weather at r=−0.50) shows that as humidity rose with the seasonal shift, the low-temperature MOX heater steps responded — water vapour adsorption on the SnO2 surface raises resistance at 100–200°C steps, producing a correlated gas-resistance uptick that reflects moisture physics, not a change in hive-VOC chemistry.📚 Reference: Burgues & Marco 2018, Sensors 18(2):339, Winston 1987, The Biology of the Honey Bee▹ Action: On your next routine visit, confirm fresh eggs in Hive #1's brood frames — the perfectly stable acoustic spectrum and on-baseline vibration confirm the worker population is fully intact, and a brood check will clarify whether the gradual cooling arc reflects a natural seasonal brood contraction. -
Hive #3 warning Score: 68/100📋 Overall Health
Your Hive #3 has the largest 14-day cooling drift in the apiary (−7.0°F / −3.9°C, from 91.2°F (32.9°C) to 84.3°F (29.0°C)), now sitting 6.2°F (3.5°C) below its all-time average of 90.5°F (32.5°C) — however, the acoustic spectrum is perfectly stable (all 10 bands within ±0.2 dB of baseline, overall −16.3 dBFS vs. all-time −16.3 dBFS), which confirms the worker population is fully present and rules out a swarm event; the most likely explanation is a natural seasonal brood contraction or a brief brood-break period with a full intact colony. Humidity at 51.1% is modestly above its all-time average of 46.8% following the September 14 step-change (+2.97%), gas resistance at ~96 kΩ is right on its all-time average of ~95 kΩ, vibration at 20.2 mG (kurtosis 3.0, peak 75 Hz) is on the all-time average of 20.5 mG, and battery at 3,998 mV is near its all-time low of 3,976 mV — worth passive monitoring as September solar input declines. On your next routine visit, a brood check will confirm laying status given the sustained temperature cooling.
🌅 Diurnal Cycle PatternsThe 24h temperature swing of 5.8°F (3.2°C) — from 81.7°F (27.6°C) to 87.5°F (30.9°C) — is consistent with Hive #3's historical pattern, and all 6 vibration bands show daily cycles (dominant 20–50 Hz at 3.2 dB, 14-of-15 days, peaks ~34.8 mG from ~19.3 mG baseline, avg 1.8×). The vibration dominant rhythm shifted from 80–120 Hz to 5–20 Hz in the second half of the window — a low-frequency shift in colony substrate activity that is worth noting but not alarming given stable acoustics. The gas heater-scan shows only 1/10 bands with a daily rhythm (150°C at +14% swing), reflecting a well-settled hive VOC environment with the seasonal humidity step already absorbed.
🔬 Correlations & Discoveriestemperature_in vs humidity_in vs gas_resistance (14d) | r = +0.93The coordinated September 14 change-points in both temperature (−2.35°C step) and humidity (+2.97% step) in Hive #3, mirrored by the strong deconfounded couplings (temp–humidity r=+0.93, temp–gas r=+0.58), point to a single physical event: a seasonal brood contraction reducing the colony's heat output, which simultaneously lowered temperature, raised RH% at constant absolute moisture, and shifted the MOX fingerprint through humidity-driven SnO2 response — all three channels moved together because one biological change (reduced brood heating) drove all three, consistent with an intact colony entering autumn brood reduction (Seeley 1985; Stabentheiner et al. 2010).📚 Reference: Eouzan et al. 2019 (PLOS ONE / PMC6368279), Stalidzans et al. 2017, Burgues & Marco 2018, Sensors 18(2):339battery vs temperature_in (14d) | r = n/aHive #3's battery has reached 3,998 mV with an all-time low of 3,976 mV, approaching a range that warrants monitoring as September reduces daily solar harvest; no immediate action is needed, but tracking the voltage trend over the coming weeks is prudent given declining daylight at this apiary's elevation.📚 Reference: van Dooremalen et al. 2024 (B-GOOD Project)⚠️ Issue: 14-day temperature cooling drift of −7.0°F (−3.9°C) is the largest in the apiary; currently 6.2°F (3.5°C) below all-time average — acoustics confirm population intact, brood status warrants confirmation on next visit.⚠️ Issue: Battery at 3,998 mV approaching all-time low of 3,976 mV — monitor passively as September solar input declines.▹ Action: On your next routine visit, check Hive #3's brood frames for fresh eggs — the perfectly stable acoustic spectrum confirms a full worker population, and a quick brood check will confirm whether the sustained 14-day cooling drift reflects a seasonal brood contraction or a brief brood-break period.▹ Action: Monitor Hive #3's battery passively — currently 3,998 mV near its all-time low of 3,976 mV; no action needed yet, but watch the trend over the next 2–3 weeks as autumn solar charging decreases.