As of September 9, 2026, your apiary is in good shape heading deeper into September — Iris, Hive #1, and Hive #3 all show acoustically stable, fully intact populations on a gentle seasonal cooling arc, while Hive #2 remains the one hive to watch, its multi-band acoustic step-down now at 28 days with brood thermoregulation locked at a textbook 95.0°F (35.0°C) and vigorous daily vibration fanning spikes continuing unabated. The rising barometric tendency (+1.44 hPa/3h) signals clearing conditions that should support good foraging across the apiary.
Across all four hives, the deseasonalized analytics consistently reveal a genuine in-hive temperature–humidity coupling (r=+0.46 to +0.63) that persists independently of outdoor weather — a textbook signature of active hygroregulation driven by brood metabolic heat and fanning, consistent with Ellis et al. 2008 and Human et al. 2006.
Against outdoor swings of 67.1–86.0°F (19.5–30.0°C) at 23–47% RH, all four hives maintain consistent daily vibration fanning rhythms and in-hive humidity in the 40–50% range — appropriate for the dry September ambient with no condensation risk; Hive #2 alone continues to show an absence of per-band low-frequency acoustic daily rhythm while all other diurnal channels remain healthy across the apiary.
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Iris healthy Score: 84/100📋 Overall Health
Your Iris hive continues in excellent shape — the 24h average of 88.8°F (31.6°C) is +0.9°F (+0.5°C) above its all-time average of 87.9°F (31.1°C), all 10 acoustic bands are within ±0.7 dB of their historical baseline (overall sound −10.5 dBFS vs. all-time −10.8 dBFS), humidity at 40.0% is healthy and consistent with the dry September ambient, gas resistance at 446 kΩ is essentially on its all-time average of 454 kΩ, and vibration at 17.4 mG (kurtosis 2.4, peak 61 Hz) is right on its all-time average of 17.2 mG. Everything here looks calm and healthy — just keep an eye on the gradual seasonal cooling arc as October approaches.
🌅 Diurnal Cycle PatternsIris shows a healthy 3.2°F (1.8°C) daily temperature arc (87.2–90.4°F / 30.6–32.4°C), well within the ≤5.4°F brood-clamping threshold, with outdoor buffering confirmed as diurnal-only (deconfounded r=+0.11, outdoor leading by ~200 min — thermal-mass damping, a sign of health). Humidity holds a remarkably flat 39.2–41.0% band reflecting strong hygroregulation against the dry 23–47% outdoor swing. Vibration shows a clear daily fanning rhythm (15/15 days, baseline ~16.5 mG peaking to ~24.8 mG, 1.5×, dominant at 80–120 Hz). The per-band spectral rhythm shift from 260–350 Hz to 200–260 Hz as the dominant acoustic rhythm band is a subtle intra-day variation within a fully stable acoustic fingerprint — all bands remain within ±0.7 dB of baseline. The gas heater-scan shows a modest daily rhythm at the 100°C step (+14% swing), consistent with humidity cycling at low plate temperatures; the scan shape is broadly stable across the mid and high steps (250–400°C), indicating no meaningful VOC shift.
🔬 Correlations & Discoveriestemperature_in vs humidity_in (14d) | r = +0.53The deseasonalized temperature–humidity coupling (r=+0.53) in Iris reflects genuine in-hive physiology: as metabolic heat from brood and heater bees warms the local air mass, absolute water content rises with activity, lifting RH independently of outdoor conditions — a textbook signature of active brood-nest hygroregulation decoupled from ambient.📚 Reference: Eouzan et al. 2019 (PMC6368279), Human, Nicolson & Dietemann 2006, Ellis et al. 2008humidity_in vs gas_resistance (14d) | r = +0.51The humidity–gas resistance coupling (r=+0.51) arises because water vapor independently suppresses MOX sensing-plate conductivity — when in-hive humidity rises with fanning or brood activity, the BME688 baseline resistance shifts upward even without a true VOC change, a well-documented MOX confound that reinforces the need to read gas only against this hive's own humidity-corrected history.📚 Reference: Burgues & Marco 2018, Winston 1987, Owens 1971▹ Action: On your next routine visit, do a quick check of Iris's brood frames for fresh eggs to confirm the gradual seasonal cooling arc reflects a natural late-summer brood contraction — the perfectly stable acoustics confirm the full population is present. -
Hive #2 warning Score: 55/100📋 Overall Health
Your Hive #2 brood temperature remains locked at a textbook 95.0°F (35.0°C) average — a razor-tight 1.7°F (0.9°C) daily arc essentially on its all-time average of 94.8°F (34.9°C) — confirming excellent active thermoregulation; however, the broad-spectrum acoustic step-down that began around August 25th is now at 28 days, with overall sound holding at −16.6 dBFS versus the all-time average of −15.0 dBFS (−1.6 dBFS below baseline), and the 100–150 Hz band remains −3.6 dB below baseline while the 1500–3600 Hz band is −3.1 dB below baseline. Humidity at 48.7% is healthy and within its all-time range of 47.1% average, gas resistance at 41.6 kΩ is near its all-time average of 46 kΩ, and vibration at 15.1 mG (kurtosis 3.5, peak 75 Hz) remains near its all-time average of 14.7 mG with impressive daily fanning spikes (baseline ~12.4 mG peaking to ~49.9 mG, 4.0×) — the combination of locked brood thermoregulation and vigorous vibration alongside a persistent, non-recovering multi-band acoustic step-down now at four weeks warrants a visual confirmation at your next routine inspection this week.
🌅 Diurnal Cycle PatternsHive #2 shows exceptionally tight brood-nest thermoregulation — a daily arc of only 1.7°F (0.9°C) (94.0–95.7°F / 34.4–35.4°C), the tightest clamping in the apiary, consistent with a large, actively brooding cluster. Vibration maintains a robust daily fanning rhythm across all 6 bands (15/15 days, peaking 4× above baseline, dominant at 80–120 Hz shifting to 160–200 Hz in the second half — a normal intra-day vibration band migration as fanning intensity shifts). However, per-band acoustic rhythm is essentially absent (max 0.6 dB in 350–420 Hz) — the persistent lack of structured low-frequency daily acoustic cycling remains the single divergent signal from this hive's own history. Gas heater-scan shows a modest 3-band daily rhythm (strongest at 200°C, +14% swing), consistent with normal metabolic-VOC cycling; the scan shape is stable across the full 100–400°C range, with resistance declining monotonically from 710 kΩ at 100°C to ~37 kΩ at 350°C before the characteristic MOX uptick at 375–400°C — a stable fingerprint.
🔬 Correlations & Discoveriestemperature_in vs gas_resistance (14d) | r = +0.62The strong deseasonalized temperature–gas coupling (r=+0.62) in Hive #2 reflects genuine colony physiology: as brood-nest temperature rises with increased metabolic activity, fanning intensifies to circulate air, concentrating hive volatiles (brood pheromones, propolis terpenes, honey-ripening esters) at the sensor — a well-documented mechanism where thermal and VOC signals co-vary with colony metabolic state, not a disease marker.📚 Reference: Stalidzans et al. 2017, Seeley 1974, Maisonnasse et al. 2010temperature_in vs humidity_in (14d) | r = +0.59The temperature–humidity coupling (r=+0.59, partial r=+0.32 controlling for outdoor weather) confirms this is a genuine hive-specific metabolic signal: the tight 95°F (35°C) brood core generates heat that drives local evaporation and fanning, lifting in-hive RH in step with thermal activity — classic active hygroregulation in a densely-brooded colony.📚 Reference: Human, Nicolson & Dietemann 2006, Ellis et al. 2008, Eouzan et al. 2019⚠️ Issue: Sustained 28-day multi-band acoustic step-down: overall sound −16.6 dBFS vs. all-time average −15.0 dBFS (−1.6 dBFS); 100–150 Hz band −3.6 dB below baseline, 1500–3600 Hz band −3.1 dB below baseline; changepoint confirmed ~August 25; 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 28-day acoustic step-down is the one signal worth confirming visually, and the rock-solid 95.0°F (35.0°C) thermoregulation and vigorous vibration fanning spikes (peaking 4× above baseline daily) are genuinely reassuring that the colony is actively caring for brood. -
Hive #1 healthy Score: 80/100📋 Overall Health
Your Hive #1 continues to be the acoustic benchmark of the apiary — all 10 spectral bands show essentially perfect stability (all per-band deltas within ±0.1 dB of the all-time baseline, overall sound −16.4 dBFS exactly on its all-time average of −16.4 dBFS), the 24h average of 82.9°F (28.3°C) is exactly on its all-time average of 83.3°F (28.5°C) and continuing the gentle seasonal cooling arc (weekly trend: 84.6→82.8→82.6°F / 29.2→28.2→28.1°C), humidity at 43.9% is healthy and slightly above its all-time average of 42.6%, and vibration at 16.7 mG (kurtosis 2.7, peak 87 Hz) is essentially on its all-time average of 16.4 mG. Nothing to do here except appreciate it.
🌅 Diurnal Cycle PatternsHive #1 shows a 5.3°F (2.9°C) daily temperature arc (80.3–85.6°F / 26.9–29.8°C) — well within the healthy brood-clamping range, with outdoor buffering confirmed as diurnal-only (deconfounded r=+0.08, outdoor leading ~230 min). The 6.2°F (3.4°C) medium-term daily oscillation reflects the colony riding late-summer heat while holding its arc comfortably below the 5.4°F clamping threshold on most days. Humidity holds a near-flat 43.4–44.4% band. Vibration shows a clear daily fanning rhythm (15/15 days, baseline ~15.9 mG peaking to ~23.1 mG, 1.5×); the dominant vibration rhythm band shifted from 80–120 Hz to 20–50 Hz between the first and second half of the window — a normal intra-day variation in substrate vibration mode, not a biological concern. Gas heater-scan shows the strongest daily rhythm in the apiary (all 10 steps cycling, +35% swing at 100°C step) — this large low-temperature step swing tracks the humidity cycle (humidity–gas r=+0.52) rather than a real VOC change, consistent with MOX water-vapor confounding at low plate temperatures.
🔬 Correlations & Discoverieshumidity_in vs gas_resistance (14d) | r = +0.52The humidity–gas coupling (r=+0.52, partial gas~temp|outdoor r=−0.80) is the dominant deconfounded relationship in Hive #1: the large gas heater-scan daily swing (all 10 steps cycling, +35% at 100°C) tracks in-hive humidity oscillations driven by fanning and foraging, not a genuine VOC shift — MOX resistance at low plate temperatures is strongly water-vapor-confounded, and the very high partial correlation controlling for outdoor temperature confirms this is hive-internal moisture physics.📚 Reference: Burgues & Marco 2018, Sensors 2022, 22(9):3301temperature_in vs humidity_in (14d) | r = +0.46The temperature–humidity coupling (r=+0.46) in Hive #1 mirrors the apiary-wide pattern: brood metabolic heat and fanning co-drive both channels independently of outdoor conditions, a textbook signature of active hygroregulation in a healthy, queen-right colony.📚 Reference: Human, Nicolson & Dietemann 2006, Ellis, Nicolson, Crewe & Dietemann 2010▹ Action: On your next routine visit, check Hive #1's brood frames for fresh eggs to confirm the ongoing seasonal cooling arc (weekly trend 84.6→82.6°F / 29.2→28.1°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: 74/100📋 Overall Health
Your Hive #3 continues its excellent run — all 10 acoustic bands are within ±0.1 dB of their historical baseline (a textbook-stable fingerprint, overall sound −16.3 dBFS vs. all-time −16.3 dBFS), the 24h average of 90.5°F (32.5°C) is −1.1°F (−0.6°C) below the all-time average of 91.6°F (33.1°C) and continuing a gentle natural seasonal tail-off (weekly trend: 92.5→91.6→90.7°F / 33.6→33.1→32.6°C), humidity at 46.1% is essentially on its all-time average of 46.6%, gas resistance at 91.5 kΩ is essentially on its all-time average of 93.5 kΩ, and vibration at 20.6 mG (kurtosis 2.4, peak 77 Hz) is right on its all-time average of 20.7 mG. The battery touched 3,982 mV during this 24h window, just above its all-time low of 3,978 mV — continue monitoring passively as September solar input declines.
🌅 Diurnal Cycle PatternsHive #3 shows a 2.9°F (1.5°C) daily temperature arc (88.8–91.7°F / 31.6–33.1°C) — tightly clamped and well within the healthy brood band, with outdoor buffering confirmed as diurnal-only (deconfounded r=+0.12, outdoor leading ~160 min). Humidity holds a 44.4–47.7% band with gentle daily variation. Vibration shows a clear daily fanning rhythm across all 6 bands (15/15 days, baseline ~19.4 mG peaking to ~34.6 mG, 1.8×, dominant at 80–120 Hz with the rhythm band shifting to 120–160 Hz in the second half — a normal intra-day variation). The gas heater-scan shows no strong daily rhythm (max +9% at 250°C), indicating the VOC environment is stable and not tracking the humidity or temperature cycles — a reassuring sign of a settled colony environment in September.
🔬 Correlations & Discoveriestemperature_in vs humidity_in (14d) | r = +0.63Hive #3 shows the strongest temperature–humidity coupling in the apiary (r=+0.63), reflecting the most tightly integrated brood-metabolic microclimate: heater-bee activity and fanning co-drive both temperature and local absolute humidity in a tightly coupled loop — the colony's thermoregulatory and hygroregulatory systems operating as a unified, healthy homeostatic unit.📚 Reference: Human, Nicolson & Dietemann 2006, Eouzan et al. 2019 (PMC6368279), Ellis et al. 2008temperature_in vs gas_resistance (14d) | r = +0.49The temperature–gas coupling (r=+0.49) in Hive #3 reflects normal brood-pheromone and propolis-volatile cycling with metabolic heat: as the brood core warms with activity, circulating air carries a richer volatile load past the sensor — a healthy metabolic correlate, not a stress signal, consistent with the fully stable acoustic fingerprint and on-baseline gas resistance.📚 Reference: Maisonnasse et al. 2010, Boch, Shearer & Stone 1962, Stalidzans et al. 2017▹ Action: Monitor Hive #3's battery passively — it touched 3,982 mV during this 24h window, just above its all-time low of 3,978 mV; no action needed yet, but keep an eye on the trend as September solar input continues to decrease.