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How does the BOM take their air temperature measurments?
For as long as I've taken my own measurements, I always meausure several degrees above the official readings. I use an electronic thermometer and a regular old alcohol one, and I always get 2 to 3 degrees above the official readings. It cannot be a systematic error due to my thermometers, I've tried many different ones and still the same thing happens. They must be doing something different. Whats the deal?
At the moment, its 5pm and 42 degrees C and still climbing, but my measurements say 44 degrees. Damn its hot.
2 Answers
- Anonymous1 decade agoFavorite Answer
The answer may lie in where the measurements are made. 'Official' measurements are made using calibrated thermometers that are housed in a Stevenson Screen; this is a large white painted box with louvred sides. The box will be sited outside somewhere (often on an airfield). Due to the siting you may get wind which causes mild cooling. This may explain the discrepancy.
- cyswxmanLv 71 decade ago
It is normal for air temperatures to vary by several degrees over relatively short distances. Differences in elevation, wind flow and surfaces account for these differences. It does not appear your readings are incorrect.
Source(s): I'm a meteorologist
