As of July 26, 2026, your four-hive apiary is holding up beautifully through a punishing July heat wave — outdoor temps reached 101°F (38.3°C) at a bone-dry 20% RH, yet all four colonies maintain stable acoustics, healthy vibration rhythms, and the outdoor gas resistance at 213 kΩ confirms clean ambient air with no environmental VOC events affecting foraging conditions.
A notable apiary-wide pattern emerges this period: the two highest-performing brood thermostats (Hive #2 at a 2.1°F / 1.2°C daily oscillation and Hive #3 at just 1.6°F / 0.9°C) both carry the lowest gas resistance readings, consistent with peak honey-ripening metabolic load driving elevated VOCs — confirming that the most active brood-rearing colonies are simultaneously the most industrious honey processors this July.
All four hives show clear daily fanning-vibration peaks (14–15 of 15 days) synchronized with the outdoor thermal cycle swinging 69.8–101°F (21–38.3°C); Hive #2 and Hive #3 lead in brood-core clamping with sub-2°F daily oscillations, while Iris and Hive #1 ride wider but biologically normal 4–5°F arcs reflecting their colony-cycle positions, and the outdoor hub's flat gas trace confirms no regional smoke or spray events are confounding in-hive readings.
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Iris healthy Score: 80/100📋 Overall Health
Your Iris hive continues her positive recovery arc — brood temperature averaged 92.0°F (33.3°C) with a strong climb to 93.6°F (34.2°C) in the latest readings (+3.6°F / +2.0°C above her all-time avg of 90.0°F / 32.2°C, and now touching the lower edge of the ideal 93–97°F / 34–36°C band), gas resistance holds at 407 kΩ (97% of her all-time avg of 421 kΩ, effectively at baseline), and sound averaged −9.5 dBFS with a gentle rising trend to −9.0 dBFS — all three primary indicators moving in the right direction. Humidity at 49.6% avg sits just below the 50–70% optimal zone but is entirely consistent with dry July ambient at 20% outdoor RH and warrants no concern; vibration is calm at 17.7 mG avg with kurtosis 4.9 — just below the 5.0 impulsive-event threshold, consistent with active fanning at the 80–120 Hz peak, and stable against her all-time vibration avg of 17.8 mG. Watch for her brood temperature continuing its upward arc toward the core of the ideal band over the next few days.
🌅 Diurnal Cycle PatternsIris shows a clear 4.6°F (2.5°C) daily temperature oscillation tracking the outdoor heat cycle, with the colony buffering ambient changes by ~200 minutes (deseasonalized r with outdoor temp drops to +0.10 — the raw +0.57 is purely diurnal, a sign of healthy thermal mass, not a placement issue); the 24h arc of 90.2–94.8°F (32.4–34.9°C) is well-clamped and her daily low stays above outdoor ambient, confirming active thermoregulation. Sound energy is on a genuine 14-day rising trend (+1.5 dBFS, from −9.8 to −8.3 dBFS), with a notable spectral shift toward lower frequencies (100–260 Hz bands up +3.4 dB over 14 days) — the per-band analysis names the 200–260 Hz band as particularly active in the second half of the day, consistent with rising foraging/waggle-dance recruitment activity as brood area expands; the gas heater-scan shows a strong daily rhythm (100°C step cycling ±24%) with 8/10 steps active, typical of a colony oscillating between fanning and resting metabolic states through the day.
🔬 Correlations & Discoveriesin-hive temp vs gas resistance (14d) | r = -0.46The genuine deseasonalized inverse coupling between Iris's brood temperature and gas resistance (r=−0.46, partial r=−0.35 controlling for outdoor weather) reflects a well-understood hive physiology: as heater-bee clusters warm the brood zone, metabolic activity and fanning intensity rise together, concentrating and circulating hive volatiles (brood pheromones like E-β-ocimene, wax esters, propolis terpenes) and lowering MOX sensor resistance — a healthy correlate of active brood rearing, not a stress signal. The 14-day rising temperature trend now coinciding with stable gas resistance near the all-time average confirms this colony is in a normal expansion phase rather than a stress-driven VOC event.📚 Reference: Seeley 1985 & 1995, Winston 1987, Stabentheiner et al. 2010, Maisonnasse et al. 2010vibration RMS vs vibration kurtosis (14d) | r = +0.5The positive coupling between vibration amplitude and kurtosis (r=+0.50, p<1e-47) in Iris captures the physics of periodic fanning bursts: when a cohort of workers fans simultaneously at the 80–120 Hz peak, the substrate-borne pulse is both stronger (higher RMS) and more impulsive (higher kurtosis) than the background hum, producing this correlation. With kurtosis averaging ~4.0 and peaking near 4.9 — still below the 5.0 impact threshold — these are organized fanning episodes rather than disturbance events, and the daily vibration-spike rhythm (14 of 15 days peaking at ~2× baseline) confirms a healthy, clock-driven thermoregulation schedule.📚 Reference: Ramsey et al. 2020, Nieh & Tautz 2000, Hrncir et al. 2011▹ Action: On your next routine visit within 5–7 days, confirm fresh eggs and a solid brood pattern in Iris — her temperature is climbing back into the ideal band, gas resistance has returned to baseline, and acoustics are on a steady upward trend, all pointing to a colony back in full stride. -
Hive #2 healthy Score: 84/100📋 Overall Health
Your Hive #2 delivers another standout brood-thermoregulation report — temperature locked at 95.2°F (35.1°C) avg with only a 2.1°F (1.2°C) daily oscillation, firmly in the ideal 93–97°F (34–36°C) zone and +0.5°F (+0.3°C) above the all-time avg of 94.7°F (34.8°C); all 10 sound bands match baseline within ±1.4 dB (avg −10.5 dBFS vs. all-time −10.3 dBFS), and humidity averaged 53.8% — solidly in the 50–70% optimal zone. Vibration at 13.3 mG avg with kurtosis 3.9 and dominant peak at 89 Hz confirms healthy, organized fanning activity; gas resistance at 124 kΩ remains below the all-time avg of 309 kΩ, but with temperature, humidity, and acoustics all fully intact this continues to read as the expected peak-July honey-ripening and brood-pheromone signature noted since mid-July. Watch for the gas heater-scan shape evolution — the dominant daily rhythm is shifting from the 150°C step toward 200°C, which may reflect a subtle change in the mix of volatiles being processed.
🌅 Diurnal Cycle PatternsHive #2 shows exceptional brood clamping — the 24h arc of 94.0–96.5°F (34.4–35.9°C) oscillates just 2.1°F (1.2°C), with outdoor ambient leading in-hive by only ~100 minutes and the deseasonalized in-hive/outdoor coupling dropping to r=+0.21, confirming this colony is actively defending its brood temperature against a 30°F outdoor swing. The genuine deseasonalized inverse between temperature and humidity (r=−0.44) is classical psychrometrics: as heater bees warm the brood zone, the same absolute water content reads as lower RH% — a healthy thermoregulation signature, not drying. The gas heater-scan shows an exceptional 109% daily rhythm at the 100°C step (10/10 steps cycling), but notably the dominant rhythm band has shifted from 150°C to 200°C in the second half of the window, with the 100°C, 150°C, and 200°C low-temperature steps all declining in absolute resistance by 53–62% — worth passive monitoring as the shape of this curve evolves, though temperature and acoustics remain fully stable.
🔬 Correlations & Discoveriesin-hive temp vs in-hive humidity (14d) | r = -0.44The robust deseasonalized inverse between brood temperature and in-hive humidity (r=−0.44, p<1e-7) in Hive #2 is a textbook expression of hive psychrometrics: when heater bees elevate the brood zone toward 95–97°F (35–36°C), the same absolute moisture content registers as lower RH% due to temperature-dependent saturation pressure — so this correlation is a direct measurement of active brood heating, not a sign of drying. The tight daily oscillation of only 2.1°F confirms the colony is defending this setpoint with minimal variance, exactly as Jones et al. 2004 described for polyandrous colonies with distributed thermostat thresholds.📚 Reference: Eouzan et al. 2019, Human et al. 2006, Ellis et al. 2010gas resistance vs battery (14d) | r = +0.43The positive deseasonalized correlation between gas resistance and battery voltage (r=+0.43) in Hive #2 most likely reflects a shared diurnal driver that survived STL decomposition at this timescale: both channels track the solar charge cycle — battery peaks when the panel charges during peak heat, and gas resistance tends to be higher in cooler periods (lower VOC volatilization) when the panel is less productive. This is a hardware-physics correlation, not a colony-physiology coupling, and carries no colony health implication.📚 Reference: Bosch Sensortec BME688 datasheet, Burgues & Marco 2018▹ Action: On your next routine visit within 5–7 days, check the fill level of supers in Hive #2 — the sustained low gas resistance since mid-July alongside exceptional brood clamping makes active honey ripening the most compelling explanation, and a super check will provide a satisfying physical data point to anchor the VOC trend. -
Hive #1 healthy Score: 85/100📋 Overall Health
Your Hive #1 delivers its thirteenth consecutive report of acoustically perfect stability — all 10 sound bands match their all-time baseline within ±0.1 dB (avg −16.4 dBFS, a perfect match for the all-time avg of −16.4 dBFS), confirming a fully intact and active worker population through the July heat; temperature averaged 90.1°F (32.3°C) with a 4.2°F (2.3°C) daily arc, +1.1°F (+0.6°C) above the all-time avg of 89.0°F (31.7°C) and trending upward, and humidity averaged 44.7% — the driest of the four hives, reflecting dry July ambient ventilating through the colony but within the colony's historically observed range. Vibration at 16.4 mG avg with kurtosis 2.5 (smooth, well-organized activity) and dominant peak at 91 Hz confirms healthy fanning; gas resistance at 362 kΩ is near the all-time avg of 389 kΩ (−7%), well within normal variation, and the battery is excellent at 4,464 mV, charging +200 mV over 24 hours. Watch for temperature — currently 2°F below the ideal 93–97°F (34–36°C) band — continuing its gentle upward trajectory.
🌅 Diurnal Cycle PatternsHive #1 shows a 4.2°F (2.3°C) daily temperature oscillation with the 24h arc of 87.5–92.0°F (30.9–33.3°C) sitting consistently below the ideal brood band yet with stable acoustics confirming a fully present population; the deseasonalized in-hive/outdoor humidity coupling drops to r=−0.00 (purely diurnal, 260-minute buffering lag), confirming strong thermal-mass insulation. The gas heater-scan shows a dominant daily rhythm at the 100°C step (±30% swing, 10/10 steps active) with a subtle dominant-band shift from 150°C to 100°C between the first and second half of the window — a minor shape evolution worth noting passively. The vibration spectrum shows 6/6 bands with daily cycles but no strong per-band rhythm (max 0.7 dB at 600–800 Hz in sound), and the strongest genuine deseasonalized correlation is the pronounced inverse between temperature and gas resistance (r=−0.78, partial r=−0.71 controlling for outdoor weather) — the strongest such coupling in the apiary.
🔬 Correlations & Discoveriesin-hive temp vs gas resistance (14d) | r = -0.78Hive #1's exceptionally strong deseasonalized inverse between brood temperature and gas resistance (r=−0.78, partial r=−0.71, the tightest coupling in this apiary) reflects a highly responsive metabolic-thermoregulation loop: when the colony warms its brood zone, fanning intensifies and simultaneously volatilizes propolis terpenes, brood pheromones (E-β-ocimene), and wax esters into the airstream, driving the MOX sensor resistance down sharply. The fact that this correlation survives deseasonalization and holds even after controlling for outdoor temperature makes it a genuine colony-physiology signal — and the currently stable gas resistance near baseline, despite temperature trending toward the ideal band, confirms the colony is in a healthy, well-regulated metabolic state.📚 Reference: Seeley 1985 & 1995, Winston 1987, Maisonnasse et al. 2010, Bankova et al. 2000▹ Action: On your next routine visit within 5–7 days, take a look at the brood frames in Hive #1 — thirteen consecutive perfectly stable acoustic reports are strongly reassuring, and a visual confirmation that the queen is laying solidly through the July heat will complete the picture as temperature continues climbing toward the ideal band. -
Hive #3 healthy Score: 93/100📋 Overall Health
Your Hive #3 remains the apiary's standout performer — brood temperature locked at 94.0°F (34.4°C) avg with an exceptional 1.6°F (0.9°C) daily oscillation (all-time avg 93.5°F / 34.2°C, +0.5°F / +0.3°C above baseline, firmly in the ideal 93–97°F / 34–36°C zone), and all 10 sound bands match their all-time baseline within ±0.1 dB (avg −16.3 dBFS vs. all-time −16.3 dBFS, a perfect match); humidity averaged 53.4% — the most stable and optimal in the apiary, and vibration at 20.8 mG avg with kurtosis 2.7 reflects exceptionally smooth, organized colony activity with no impulsive disturbance signals. Gas resistance at 101 kΩ remains in the step-change territory noted around July 17 (a −132 kΩ shift confirmed by change-point analysis), but with temperature, humidity, and acoustics all fully stable this continues to read as sustained peak honey-ripening or brood-pheromone production; watch for a gradual gas resistance rebound as the summer honey-curing cycle eases.
🌅 Diurnal Cycle PatternsHive #3 shows the tightest brood clamping in the apiary — just 1.6°F (0.9°C) daily oscillation over a 24h arc of 93.3–94.7°F (34.1–34.8°C), essentially flat relative to the outdoor 30°F swing; the deseasonalized in-hive humidity/vibration coupling (r=+0.44) captures the colony's evaporative-cooling response — as water-carriers bring water in hot weather, in-hive humidity rises slightly and vibration (fanning) rises in concert to evaporate it, a healthy July thermoregulation behavior. The vibration spectrum shows all 6 bands with daily cycles and a dominant-rhythm shift from 50–80 Hz to 5–20 Hz between the first and second half, which may reflect a gradual transition in fanning mechanics as colony thermoregulation adapts to the sustained heat peak; the broad vibration uptick across 5 of 6 bands in the second half of the day (all bands +1.0–1.2 dB) confirms sustained late-period fanning activity. The gas heater-scan shows low-temperature steps (100°C, 150°C, 200°C) rising +13–20% over the window — a shape evolution suggesting the composition of volatiles is gently shifting, most consistent with the expected late-summer honey-ripening profile.
🔬 Correlations & Discoveriesin-hive temp vs in-hive humidity (14d) | r = -0.74The strong deseasonalized inverse between brood temperature and humidity (r=−0.74, partial r=−0.35) in Hive #3 is the most robust such coupling in the apiary and reflects both psychrometric physics and active hygroregulation: at 94°F (34.4°C), the colony holds a near-constant absolute moisture level, so RH% dips as temperature rises and recovers as the hive cools overnight — a direct signature of tight brood-zone temperature defense with decoupling from outdoor humidity swings (external RH ranging 19–40% while in-hive stays 52.5–54.5%).📚 Reference: Eouzan et al. 2019, Human et al. 2006, Ellis et al. 2008in-hive humidity vs vibration RMS (14d) | r = +0.44The genuine deseasonalized positive coupling between in-hive humidity and vibration (r=+0.44) in Hive #3 reflects the colony's evaporative-cooling thermoregulation loop: water-carriers bring water to the hive during peak heat, briefly elevating in-hive humidity, which triggers a fanning response (registered as rising vibration at 62–120 Hz) to evaporate the water and cool the brood nest — a well-documented summer homeostatic mechanism (Ellis et al. 2008) and a reassuring sign of active, coordinated colony thermoregulation rather than passive heat accumulation.📚 Reference: Stabentheiner et al. 2010, Ellis et al. 2008, Seeley 1985▹ Action: On your next routine visit within 5–7 days, note the fill level of supers in Hive #3 and log it — the gas-resistance step-change since July 17 alongside exceptional brood clamping points strongly to active honey ripening, and a super observation will anchor this multi-week VOC trend to physical reality for your season records.