Weerman Leen de Koning

Weerman Leen de Koning

Nieuwerkerk a/d IJssel


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TROPISCHE DAGEN

De afgelopen week was het extreem warm met zelfs drie tropische dagen. Het bleef droog en de zon scheen volop. Opmerkelijk, omdat er in augustus geen enkele tropische dag is voorgekomen. Zondag werd het 32,4 graden en niet eerder sinds de waarnemingen in 1985 in Nieuwerkerk ad IJssel zijn begonnen was het in september zo heet.

Sinds begin vorige eeuw zijn alle maanden warmer geworden. De temperatuur in september is nu zelfs iets hoger dan de temperatuur in juni begin vorige eeuw. Daarmee is september het nieuwe juni.

September is het nieuwe juni

September is na juli, augustus en juni de warmste maand van het jaar. Sinds begin vorige eeuw zijn alle maanden warmer geworden. De temperatuur in september in het huidige klimaat (14,7 graden, 1991-2020) is zelfs iets hoger dan de temperatuur in juni in het klimaat van begin vorige eeuw (14,4 graden). Wat betreft de temperatuur is september het nieuwe juni. Juli en augustus waren vroeger al wel warmer dan september nu.

Ook het aantal zomerse dagen (maximumtemperatuur van 25 graden of meer) en tropische dagen (30 graden of meer) in september in het huidige klimaat is vergelijkbaar met de aantallen in juni in het klimaat van begin vorige eeuw.  In juni 1901-1930 waren er in De Bilt gemiddeld 2,8 zomerse en 0,2 tropische dagen, in september 1991-2020 respectievelijk 2,1 en 0,2 dagen.

De zon en de zee in september en juni

De verdeling van de temperatuur over Nederland is in september wel anders dan die in juni.  In juni volgt de temperatuur vooral de hoeveelheid zonnestraling, met de hoogste temperaturen in het zuiden van het land, waar de meeste zon is. In september is er minder zon en speelt vooral de invloed van de Noordzee, die in de zomer is opgewarmd. Hierdoor is in september de temperatuur het hoogst in het westen van het land.

KNMI-Klimaatbericht door Peter Siegmund

Het was maandag  een zonnige en warme dag, al trok er wel sluierbewolking over. Het werd ruim 25 graden.

Dinsdag scheen de zon ongehinderd en er stond een zwakke tot matige wind uit het oosten tot noordoosten. Het werd ruim 28 graden.

Het warme weer ging ook woensdag door. Het werd tropisch warm en er stond maar weinig wind.

De temperatuur kwam bij veel zon donderdag uit op ruim 29 graden. Er was opnieuw geen bewolking

Het werd vrijdag tropisch warm met een maximum temperatuur van 30,8 graden. De zon scheen volop.

Zaterdag was het een fractie minder warm. Het werd bij veel zon ruim 28 graden.

Het werd zondag weer tropisch warm met veel zon. Het werd uiteindelijk 32,4 graden, een nieuw september record.

De weerspreuk van de week:

Mooie Gorgoon (9-9),

veertig dagen schoon!

 

 

 

 

 

 

 

 


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Week 36 temperatuur (°C)

Minimum   Maximum
Datum 2023 2022   2023 2022
MA 04-09 12.8 15.8   25.5 27.6
DI 05-09 14.6 15.6   28.7 31.3
WO 06-09 16.4 16.8   30.3 26.9
DO 07-09 16.4 15.2   29.5 24.7
VR 08-09 16.4 16.1   30.8 23.1
ZA 09-09 16.7 14.3   28.8 18.7
ZO 10-09 19.2 15.0   32.4 21.8

Week 36 neerslag (mm)

Datum 2023 2022
MA 04-09 0.0 0.0
DI 05-09 0.0 0.0
WO 06-09 0.0 6.4
DO 07-09 0.0 20.0
VR 08-09 0.0 3.2
ZA 09-09 0.0 8.6
ZO 10-09 0.0 6.6