Temperature is measured from 1.2 to 1.5 meters above the ground. Automatically observed by a platinum resistance thermometer.
Observation period: 1 hour, unit: °C
Wind speed
The wind speed depends on the height from the ground, so it means the average wind speed at a height of 10 m above the ground. Automatically observed using wind speed sensors such as optical chopper or ultrasonic.
Observation period: 1 hour, unit: m/s
Humidity
Humidity is expressed as relative humidity. (The ratio of the amount of water vapor actually contained in the atmosphere to the maximum amount of water vapor that can be contained by the temperature at that time). Automatically observed by capacitive hygrometer.
Observation period: 1 hour, unit: %
Cloudiness
The total cloud is the 10th fraction of the sky that all clouds cover. Visually observed manually.
Observation period: 1 hour, unit: 1/10
Precipitation
Precipitation is measured liquid precipitation such as rain and dew rain or or by melting solid precipitation, such as snow or hail. Mainly automatically observed with conductive precipitators or weight-type precipitators.
Observation period: 1 hour, unit: mm
Solar radiation
Short wave radiation or insolation of solar radiation with a wavelength of 0.29 to 3.0 μm. Automatically observed by the Solar System
Observation period: 1 hour, unit:
Frost
Frost is a phenomenon in which ice crystals are attached to the ground or an object on the ground by sublimation. Visually observed manually.
