Sea-Level Pressure Correction
Convert a station (barometer) pressure reading to sea-level pressure using elevation and temperature, free online.
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Weather reports use pressure reduced to sea level. The hypsometric approximation is P₀ = P × (1 − 0.0065·h ÷ (T + 0.0065·h + 273.15))^−5.257, with the station pressure P, elevation h in metres and temperature T in °C. Standard sea-level pressure is 1013.25 hPa (29.92 inHg).