Based on relative air humidity, other air humidity parameters can be calculated, for example absolute humidity and mixture ratios. The absolute air humidity is often low during the winter and high during the summer.
We measure relative air humidity outdoors at approx. 1.5 m above the ground. Air humidity outdoors is not the same as air humidity indoors.
Where are these measurements taken?
In the column on the right there are maps you can zoom in and out of which show the weather stations in operation in 2008.
The larger stations report temperature, precipitation, wind, air pressure, air humidity etc. several times per day. Automatic stations measure the temperature, precipitation, wind, gusts, air pressure, air humidity etc. every three hours.
The station network has changed over the years, so if there is no station marked in the area/place you are interested in, it is possible that we still have older data close by. The selection of station therefore takes place in consultation with our meteorologists.
How is the data compiled?
In SMHI's database, relative air humidity data is stored. Based on this information, other humidity measurements can be calculated. Examples of humidity measurements include:
- relative humidity (%)
- absolute humidity (g water/m3)
- enthalpy (kJ/kg dry air)
- specific humidity (g water/kg humidity air)
- mixture ratio (g water/kg dry air)
- vapour pressure (hPa)
- wet temperature (°C)
- dew point (°C)
The results are presented in the form of tables, maps or diagrams, according to your requirements. Data can be compiled in time series and monthly tables.
The number of observations of different air humidity intervals, in absolute figures or as a percentage, divided by the amount of months, can be ordered in a frequency table. The air humidity can be compared to the temperature in a temperature-humidity frequency table.