This is a CSV file containing temperatures recorded from inside my deep freeze freezer in my garage. What insights can you gather from this data?
15 minutes ago
This is a CSV file containing temperatures recorded from inside my deep freeze freezer in my garage. What insights can you gather from this data?
15 minutes ago
Daily temperature: mean, min, max (Jun 23 – Aug 22)
61-10-5051015201917253341495761
Daily maxDaily meanDaily min
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Average temperature by hour of day
24-6-4-2024147101316192224
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The freezer is healthy but running slightly warm. 1,369 readings over 61 days (Jun 23 – Aug 22), median −0.2°F, mean −0.4°F. That's right at the 0°F line rather than below it — 48% of readings were above 0°F. Food is safe, but 0°F is the target for long-term quality, so nudging the dial down one notch would give you real margin.
Three things stood out:
1. A strong daily cycle — and it's backwards from what you'd expect. The freezer is coldest mid-afternoon (−3.9°F at 3pm) and warmest in the early morning (+2.2°F at 6–8am), a ~6°F swing. In a hot garage that makes sense: afternoon heat makes the compressor run long, hard cycles that overshoot cold, while overnight it barely kicks on and the box drifts up. Your warmest hours are also when you're least likely to notice.
2. Four door-open events, all with clean recovery. The sensor jumped to rapid logging (every 1–3 min) during these — it looks like it has an alarm threshold around 5°F:
| Date | Peak | Recovery |
|---|---|---|
| Jun 30, 5:25pm | 15.1°F | ~45 min |
| Jul 7, 7:49pm | 16.0°F | ~1.5 hr |
| Jul 11, 5:10pm | 12.4°F | ~1.5 hr |
| Aug 8, 8:06am | 10.4°F | ~1 hr |
Recovering to sub-zero within an hour or two is a good sign — the seal, compressor, and insulation are all doing their job. Nothing here suggests thawing.
3. A cold spell from Jul 13–Aug 2 where daily means dropped to about −2°F and daily maxes flattened to under 3°F. Either you adjusted the thermostat, or a hot stretch outside kept the compressor working — consistent with the afternoon pattern above. It drifted back up to near 0°F in mid-August.
Data quality note: 87 hourly readings are missing (~6%), including 11–12 hour gaps on Jun 24 and Jun 25 — likely Wi-Fi dropouts rather than sensor failure, since temps on either side look normal. Worth knowing if you're relying on this for alarms while traveling.
13 minutes ago
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