Air Temperature - Thermometer Air Pressure - Barometer Humidity - Hygrometer Wind - Weather Vane (direction) with anemometer (speed) Rainfall - Rain Gauge I've even seen software that can use a...
Well it depends on how you're measuring the weather and what type of weather you're measuring. If you're measuring a hurricane it can be measured in length(km) or you can measure it by putting it...
The usual measurements are
date and time
place
temperature
barometric pressure - whether rising or falling
relative humidity
precipitation - type and quantity
wind speed
wind direction
...