As of September 10, 2026, three of your four hives — Iris, Hive #1, and Hive #3 — are acoustically stable and healthy, riding a gentle seasonal cooling arc as September progresses; Hive #2 remains the one hive to watch, with its multi-band acoustic step-down now entering its fifth week while brood thermoregulation holds a textbook 94.8°F (34.9°C) and vigorous daily fanning spikes continue. The easing-higher barometric tendency (+0.38 hPa/3h) and clean outdoor air (gas resistance ~971 kΩ) signal settling conditions favorable for foraging across the apiary.
Across all four hives, the robust deconfounded correlation between in-hive temperature and in-hive humidity (r=+0.43–0.62) reflects active brood-nest hygroregulation: as bees generate metabolic heat to maintain brood temperature, evaporative water vapor rises proportionally, a coupling documented by Ellis et al. 2008 as a signature of healthy nurse-bee activity rather than any environmental artifact.
Against outdoor swings of 63–87°F (17.2–30.6°C) at 25–52% RH, all four hives show consistent daily vibration fanning rhythms and in-hive humidity held in the 41–49% range — appropriate for the dry September ambient with no condensation risk; Hive #2 alone continues to show an absence of per-band acoustic daily rhythm while Iris exhibits the most active sound diurnal cycling of the group, with a subtle 150–200 Hz band rise in the second half of the day consistent with forager return activity.
-
Iris healthy Score: 85/100📋 Overall Health
Your Iris hive continues in excellent shape — the 24h average of 88.1°F (31.2°C) is +0.2°F (+0.1°C) above its all-time average of 87.9°F (31.0°C), all 10 acoustic bands are within ±0.5 dB of their historical baseline (overall sound −11.0 dBFS vs. all-time −10.8 dBFS), humidity at 41.1% is stable and consistent with the dry September ambient, gas resistance at 460 kΩ is essentially on its all-time average of 455 kΩ, and vibration at 17.4 mG (kurtosis 2.7, peak 85 Hz) is right on its all-time average of 17.2 mG. Everything here looks calm and healthy — just continue watching the gradual seasonal cooling arc as October approaches.
🌅 Diurnal Cycle PatternsIris shows a healthy 3.8°F (2.1°C) daily temperature arc (85.9–89.7°F / 30.0–32.1°C), well within the brood-clamping threshold; the dominant sound daily rhythm has shifted from 260–350 Hz to 200–260 Hz between the first and second half of the window — a subtle but real spectral migration worth tracking over the coming days, though all per-band deltas remain within ±0.5 dB of baseline. The vibration dominant rhythm has shifted from 50–80 Hz to 120–160 Hz, and 14 of 15 days show clear fanning peaks (baseline ~16.6 mG rising to ~24.6 mG, 1.5×) consistent with a healthy late-summer foraging schedule; humidity held 40.0–42.3% across the 24h window, stable and appropriate for the dry September conditions outdoors at 25–52% RH.
🔬 Correlations & Discoveriesin_hive_humidity vs gas_resistance (14d) | r = +0.53The deconfounded r=+0.53 coupling between in-hive humidity and gas resistance in Iris reflects metabolic water vapor from brood respiration and honey ripening — as moisture rises slightly, VOC-laden air circulates more, lowering sensor resistance; this is a healthy brood-activity signature, not a ventilation concern, consistent with active late-summer colony biology.📚 Reference: Winston 1987, The Biology of the Honey Bee, Ellis et al. 2008, J. Insect Physiol. 54:1516–1521in_hive_temp vs in_hive_humidity (14d) | r = +0.5The genuine residual coupling between temperature and humidity (r=+0.50) in Iris — after removing the shared diurnal cycle — reflects nurse-bee thermoregulation generating metabolic water vapor in the brood nest, a well-documented physiological coupling that is a positive indicator of active brood rearing (Eouzan et al. 2019).📚 Reference: Eouzan et al. 2019, PLOS ONE / PMC6368279, Human, Nicolson & Dietemann 2006, Naturwissenschaften 93:397–401▹ 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 94.8°F (34.9°C) average — a razor-tight 1.5°F (0.8°C) daily arc exactly on its all-time average — confirming excellent active thermoregulation; however, the broad-spectrum acoustic step-down that began around August 25th is now entering its fifth week, with the 100–150 Hz band now −2.7 dB below baseline and the 1500–3600 Hz band −2.2 dB below baseline (overall sound −16.5 dBFS vs. all-time average −15.4 dBFS). Humidity at 48.3% is healthy and within its all-time range, gas resistance at 41.8 kΩ is near its all-time average of 45.5 kΩ, and vibration at 14.9 mG (kurtosis 3.3, peak 88 Hz) continues its impressive daily fanning spikes (baseline ~12.4 mG peaking to ~50.2 mG, 4.1×) — the combination of locked brood thermoregulation and vigorous vibration alongside a persistent, non-recovering multi-band acoustic step-down now at five weeks warrants a visual confirmation at your next routine inspection this week.
🌅 Diurnal Cycle PatternsHive #2 continues to show the most compressed temperature arc in the apiary — just 1.5°F (0.8°C) daily oscillation (94.1–95.6°F / 34.5–35.3°C) — a textbook brood-nest stenothermy signature (Kleinhenz et al. 2003); the per-band acoustic analysis shows no strong daily acoustic rhythm (max 0.6 dB), which has been the defining characteristic of this hive's step-down since ~August 25th. By contrast, vibration remains strongly rhythmic: 6/6 bands show a daily cycle, dominant rhythm shifting from 80–120 Hz to 120–160 Hz, with the vibration fanning spikes peaking at 50.2 mG (4.1× baseline) on a consistent schedule. Humidity oscillated 46.0–50.7% across the 24h window and the gas heater-scan shows the daily rhythm concentrated at the low-temperature (100°C) step with a +14% swing — a moisture-driven MOX artifact consistent with the in-hive humidity cycling, not a VOC event.
🔬 Correlations & Discoveriesin_hive_temp vs gas_resistance (14d) | r = +0.62The strong deconfounded r=+0.62 between brood temperature and gas resistance reflects metabolic coupling: as heater bees raise brood temperature, brood pheromones (E-β-ocimene) and respiratory VOCs increase proportionally, reducing MOX resistance; this is a healthy brood-activity fingerprint and consistent with the tight thermoregulation Hive #2 is demonstrating.📚 Reference: Maisonnasse et al. 2010, PLoS ONE 5(10):e13531, Kleinhenz, Bujok, Fuchs & Tautz 2003, J. Exp. Biol. 206:4217–4231in_hive_temp vs in_hive_humidity (14d) | r = +0.58The residual temp–humidity coupling (r=+0.58) in Hive #2, after removing the shared diurnal cycle, is driven by nurse-bee metabolic water vapor during brood heating — the tight 1.5°F brood arc actually amplifies this coupling because the colony is doing precise, sustained thermoregulatory work, exactly as documented in brood-rearing physiology literature.📚 Reference: Ellis, Nicolson, Crewe & Dietemann 2010, Naturwissenschaften 97:429–433, Human, Nicolson & Dietemann 2006, Naturwissenschaften 93:397–401⚠️ Issue: Sustained ~5-week multi-band acoustic step-down: overall sound −16.5 dBFS vs. all-time average −15.4 dBFS (−1.1 dBFS); 100–150 Hz band −2.7 dB below baseline, 1500–3600 Hz band −2.2 dB below baseline; changepoint confirmed ~August 25; no per-band acoustic daily rhythm detectable; 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 5-week acoustic step-down is the one signal worth confirming visually, and the rock-solid 94.8°F (34.9°C) thermoregulation and vigorous daily fanning vibration spikes (peaking 4.1× above baseline) are genuinely reassuring that the colony is actively caring for brood. -
Hive #1 healthy Score: 80/100📋 Overall Health
Your Hive #1 remains the acoustic benchmark of the apiary — all 10 spectral bands are within ±0.1 dB of their all-time baseline (overall sound −16.4 dBFS exactly on its historical average), the 24h average of 81.8°F (27.7°C) is −1.4°F (−0.8°C) below its all-time average of 83.2°F (28.5°C) and continuing the gentle seasonal cooling arc (weekly trend: 84.7→82.8→82.6°F / 29.3→28.2→28.1°C), humidity at 44.7% is healthy and consistent, and vibration at 16.4 mG (kurtosis 2.9, peak 70 Hz) is exactly on its all-time average. A statistically confirmed humidity step-up of +3.9% around September 1st warrants a passive note — most likely reflecting seasonal changes in the colony's brood load or local forage humidity — but with temperature and acoustics perfectly on baseline, there is nothing to act on.
🌅 Diurnal Cycle PatternsHive #1 shows the widest daily temperature arc in the apiary at 6.3°F (3.5°C) (78.2–85.7°F / 25.7–29.8°C), which tracks the outdoor swing of 63–87°F (17.2–30.6°C) through the shared diurnal cycle (deconfounded r=+0.07, outdoor leads by ~220 min — thermal-mass buffering, a sign of health); the brood temperature sits below the 93–97°F (34–36°C) ideal band, consistent with the colony reading a cooler zone or a natural late-summer brood contraction at this stage of the cooling arc, with the full worker population confirmed intact by the perfectly stable acoustics. Vibration daily rhythm is dominated by the 5–20 Hz band in the second half of the window (shifted from 80–120 Hz) — an interesting low-frequency shift worth tracking, though kurtosis at 2.9 is normal. The gas heater-scan shows a strong 10/10-band daily cycle with the dominant rhythm shifting from 150°C to 100°C steps — this is a humidity-driven MOX artifact tied to the September 1st humidity step-up (r=+0.52, humidity~gas resistance), not a VOC event; humidity held 44.1–45.7% across the 24h window.
🔬 Correlations & Discoveriesgas_resistance vs in_hive_temp (14d) | r = -0.82The strong partial correlation of gas resistance vs. in-hive temperature (controlling for outdoor weather, r=−0.82) in Hive #1 reflects the well-established inverse MOX temperature response: as the hive warms during the day, the SnO2 plate's own baseline conductivity rises, lowering apparent resistance independent of any VOC change — this is sensor thermodynamics, not a brood or disease signal, and explains the 10/10-band gas daily cycle perfectly.📚 Reference: Burgues & Marco 2018, Sensors 18(2):339, Correction Model for MOX Sensor Drift, Sensors 2022, 22(9):3301in_hive_humidity vs gas_resistance (14d) | r = +0.52The September 1st humidity step-up (+3.9%) in Hive #1 is the most likely driver of the sustained humidity–gas resistance coupling (r=+0.52): more moisture in the hive air both directly affects MOX resistance and indicates increased metabolic water vapor from brood respiration or early honey ripening activity as the colony consolidates late-summer stores.📚 Reference: Winston 1987, The Biology of the Honey Bee, White 1978, Advances in Food Research 24:287–374▹ Action: On your next routine visit, check Hive #1's brood frames for fresh eggs to confirm the ongoing seasonal cooling arc (weekly trend 84.7→82.6°F / 29.3→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 ±0.2 dB of their historical baseline (overall sound −16.2 dBFS vs. all-time −16.3 dBFS), the 24h average of 90.3°F (32.4°C) is −1.2°F (−0.7°C) below the all-time average of 91.5°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 48.5% is essentially on its all-time average of 46.5% and healthy, gas resistance at 90.8 kΩ is near its all-time average of 93.8 kΩ, and vibration at 20.6 mG (kurtosis 2.7, peak 46 Hz) is right on its all-time average of 20.7 mG. The battery touched 3,978 mV during this 24h window, matching its all-time low — continue monitoring passively as September solar input declines.
🌅 Diurnal Cycle PatternsHive #3 shows a healthy 3.1°F (1.7°C) daily temperature arc (87.7–92.0°F / 31.0–33.3°C), with outdoor thermal buffering confirmed (deconfounded r=+0.11, outdoor leads by ~170 min); all 6 vibration bands show a daily cycle with dominant rhythm shifting from 160–200 Hz to 80–120 Hz in the second half of the window — a normal within-day spectral migration of fanning activity — and 15 of 15 days show distinct daily peaks (baseline ~19.4 mG to ~34.7 mG, 1.8×). The gas heater-scan shows no strong daily rhythm (max 9% swing at 250°C), consistent with stable colony chemistry; humidity held 46.8–50.9% across the 24h window and the outdoor gas resistance at ~971 kΩ confirms pristine air quality with no environmental VOC events affecting the colony.
🔬 Correlations & Discoveriesin_hive_temp vs in_hive_humidity (14d) | r = +0.58The strong residual temp–humidity coupling (r=+0.58) in Hive #3, after deseasonalization, reflects metabolic water vapor co-produced with brood heating — a consistent signature of active nurse-bee thermoregulation that mirrors the same relationship seen across the apiary and confirms healthy brood-rearing activity heading into autumn.📚 Reference: Eouzan et al. 2019, PLOS ONE / PMC6368279, Human, Nicolson & Dietemann 2006, Naturwissenschaften 93:397–401in_hive_temp vs gas_resistance (14d) | r = +0.5The genuine r=+0.50 coupling between in-hive temperature and gas resistance in Hive #3 reflects brood-pheromone and metabolic VOC concentration rising with brood-nest temperature — as the colony heats brood, E-β-ocimene and respiratory organic acids increase proportionally, lowering MOX resistance; this is a healthy brood-activity fingerprint at a gas baseline (90.8 kΩ) that has been stable all season.📚 Reference: Maisonnasse et al. 2010, PLoS ONE 5(10):e13531, Seeley 1974, J. Insect Physiol. 20:2301–2305▹ Action: Monitor Hive #3's battery passively — it touched 3,978 mV during this 24h window, matching 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.