KNMI Weather data: Difference between revisions
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Once downloaded and unzipped, you can import the the downloaded weather data file using Microsoft Excel or a similar spread sheet program. | Once downloaded and unzipped, you can import the the downloaded weather data file using Microsoft Excel or a similar spread sheet program. | ||
See also: [[How to import KNMI weather data into Microsoft | See also: [[How to import KNMI weather data into Microsoft Excel]] | ||
The KNMI weather data table is built up as follows: | The KNMI weather data table is built up as follows: |
Revision as of 15:03, 20 December 2019
Certain weather data is required as input for the Heat Stress Module of the Heat Overlay. This weather data is used either directly (humidity) or as a means to translate to a value on a different level (wind speed).
This page contains a tutorial how to retrieve daily and hourly weather data for relevant days and UTC hours using historical KNMI weather data measured at weather stations.
Retrieve the correct weather data
First of all, an user has to determine what weather station should be used to retrieve the reference values for the hourly and daily weather related Heat Stress model attributes.
A geographical overview of the Dutch weather stations can be found here.
Once a valid weather station has been chosen, download the weather data from this location.
The KNMI Historical Weather data table
Once downloaded and unzipped, you can import the the downloaded weather data file using Microsoft Excel or a similar spread sheet program.
See also: How to import KNMI weather data into Microsoft Excel
The KNMI weather data table is built up as follows:
Column | Name | Unit | Dutch Description |
---|---|---|---|
2/B | YYYYMMDD | Date | datum (YYYY=jaar,MM=maand,DD=dag) |
3/C | HH | Hour | tijd (HH=uur, UT.12 UT=13 MET, 14 MEZT. Uurvak 05 loopt van 04.00 UT tot 5.00 UT |
4/D | DD | Degrees | Windrichting (in graden) gemiddeld over de laatste 10 minuten van het afgelopen uur (360=noord, 90=oost, 180=zuid, 270=west, 0=windstil 990=veranderlijk. Zie [1] |
5/E | FH | 0.1 m/s | Uurgemiddelde windsnelheid (in 0.1 m/s). Zie [2] |
6/F | FF | 0.1 m/s | Windsnelheid (in 0.1 m/s) gemiddeld over de laatste 10 minuten van het afgelopen uur |
7/G | FX | 0.1 m/s | Hoogste windstoot (in 0.1 m/s) over het afgelopen uurvak |
8/H | T | 0.1 °C | Temperatuur (in 0.1 graden Celsius) op 1.50 m hoogte tijdens de waarneming |
9/I | T10 | 0.1 °C | Minimumtemperatuur (in 0.1 graden Celsius) op 10 cm hoogte in de afgelopen 6 uur |
11/J | TD | 0.1 °C | Dauwpuntstemperatuur (in 0.1 graden Celsius) op 1.50 m hoogte tijdens de waarneming |
12/K | SQ | 0.1 hours (=6 minutes) | Duur van de zonneschijn (in 0.1 uren) per uurvak, berekend uit globale straling (-1 for <0.05 uur); |
13/L | Q | J/cm2 | Globale straling (in J/cm2) per uurvak; |
14/M | DR | 0.1 hours (=6 minutes) | Duur van de neerslag (in 0.1 uur) per uurvak |
15/N | |||
16/O | RH | 0.1 mm | Uursom van de neerslag (in 0.1 mm) (-1 voor <0.05 mm) |
17/P | P | 0.1 hPa | Luchtdruk (in 0.1 hPa) herleid naar zeeniveau, tijdens de waarneming |
18/Q | VV | m | Horizontaal zicht tijdens de waarneming (0=minder dan 100m, 1=100-200m, 2=200-300m,..., 49=4900-5000m, 50=5-6km, 56=6-7km, 57=7-8km, ..., 79=29-30km, 80=30-35km, 81=35-40km,..., 89=meer dan 70km) |
19/R | N | % | Bewolking (bedekkingsgraad van de bovenlucht in achtsten), tijdens de waarneming (9=bovenlucht onzichtbaar) |
20/S | U | % | Relatieve vochtigheid (in procenten) op 1.50 m hoogte tijdens de waarneming |
21/T | WW | # | Weercode (00-99), visueel(WW) of automatisch(WaWa) waargenomen, voor het actuele weer of het weer in het afgelopen uur. Zie http://bibliotheek.knmi.nl/scholierenpdf/weercodes_Nederland |
22/U | IX | Bewolking (bedekkingsgraad van de bovenlucht in achtsten), tijdens de waarneming (9=bovenlucht onzichtbaar) |
As far as we have understood, the hours in the hour columns are in UTC. This means that 2013-08-02 14.00 local time will be:
Column | Name | Value |
---|---|---|
B | YYYYMMDD | 20130802 |
C | HH | 12 |
See also
- DPRA Heat Module tutorials
- How to calculate the hourly radiation
- How to calculate the hourly humidity
- How to calculate the hourly wind direction
- How to calculate the hourly wind speed
- How to calculate the daily average wind speed
- How to calculate the daily min and max temperature
- How to calculate the daily average radiation