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Aviation Weather Handbook

FAA-H-8083-28B Version 2026
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Appendix F: Units of Measurement

Appendix F reference entries, page F-1.
UnitMeaning
°C or Cdegrees Celsius or Celsius
cmcentimeter
dBZdecibels of Z
°F or Fdegrees Fahrenheit or Fahrenheit
fpmfeet per minute
ftfoot
ggram
hPahectopascal
hrhour
ininch
inHginches of mercury
Jjoule
J/gjoules per gram
J g⁻¹ K⁻¹joules per gram-Kelvin
J/kgjoules per kilogram
KKelvin
kgkilogram
kg/mkilogram per meter
kg/m³kilogram per cubic meter
kmkilometer
km/hkilometers per hour
ktknot
kWkilowatt
lbpound
mmeter
m³cubic meter
Appendix F reference entries, page F-2.
UnitMeaning
mb or mbarmillibar
mg/m³milligrams per cubic meter
MHzmegahertz
mimile
minminutes
mphmiles per hour
m/smeters per second
nmnanometer
NMnautical mile
psipounds per square inch
s or secsecond
SMstatute mile
Wwatt
W m⁻¹ K⁻¹watt per meter-Kelvin