Temperature by Altitude
Temperature by Sun Position
Temperature by Latitude Zone
Scatter: Temperature vs Altitude
Hardware Design Parameters
Based on wrap-corrected temperature data from 57,238 balloon flights.
| Parameter | Value | Notes |
|---|
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About This Data
Data Source
Telemetry from U4B pico balloon trackers collected via wspr.live. The U4B protocol encodes temperature in the WSPR signal, allowing tracking of balloon environmental conditions.
Temperature Wrap Correction
U4B encodes temperatures from -50°C to +39°C. When temperatures go below -50°C, they "wrap" to appear as warm readings (+38°C, +37°C, etc.). We detected and corrected 5,489 wrapped readings (1.34% of data), revealing actual temperatures down to -68°C.
Key Insight
Daytime is colder than nighttime at cruise altitude! Solar heating causes balloons to rise higher during the day, where temperatures are lower. Average day temp: -9°C, night: -4°C.