chmi.cz

Readiness by lane

Green: chmi.cz. Thin bar: Weather Forecast peer median.

Priority fixes for chmi.cz

Ordered by impact and by how common each practice is among peers.

1. Priority 1 · Harden

   HTTP requests move to HTTPS

   Observed: A request to http://www.chmi.cz/ was not redirected to HTTPS.

   Why it matters: Visitors who type the address or follow an old link start on unencrypted HTTP. A redirect moves them to the encrypted site before any cookies or form data are sent.

   What to do: Add a permanent (301 or 308) redirect from every http:// URL to the same https:// URL at your CDN, load balancer or web server.

   92% of Weather Forecast peers do this. Limit: Measured for the homepage only, from one location, at the time of the check.

   Guide: HTTPS and TLS Guide for Website Owners

2. Priority 2 · Accelerate

   No render-blocking scripts in <head>

   Observed: The homepage <head> loaded 4 external scripts without async or defer.

   What to do: Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.

   56% of Weather Forecast peers do this.

   Guide: Control Third-Party Scripts Before They Control Your Page

3. Priority 3 · Harden

   DMARC policy enforces quarantine or reject

   Observed: The DMARC policy for chmi.cz was p=none, which asks receivers to take no action on failing mail.

   What to do: Publish DMARC with p=none and a reporting address first, fix any legitimate senders that fail SPF or DKIM alignment, then move to quarantine and finally reject.

   31% of Weather Forecast peers do this.

   Guide: A Practical Website Health Check for Owners

4. Priority 4 · Accelerate

   Modern image formats in use

   Observed: The homepage had 127 images and none used WebP or AVIF.

   What to do: Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.

   23% of Weather Forecast peers do this.

   Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format

What chmi.cz already does well

Practices fewer than half of Weather Forecast peers use.

• DNSSEC signedDNSSEC delegation (DS record) present.12% of peers
• Content Security Policy presentContent-Security-Policy present.22% of peers
• Referrer-Policy setReferrer-Policy present.27% of peers

What we saw

Homepage checked

https://www.chmi.cz/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

DigiCert, 396-day validity, expiring 2027-03-07

DNS operators

1 self-run or other nameserver domain

HSTS

max-age 365 days, includeSubDomains, preload

DMARC policy

p=none

Homepage HTML

631 KB, gzip

Images on homepage

127 (jpg 176, svg 70, png 56)

Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.

Stack and providers

Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.

All 31 checks

Select a gap for the method and fix. How each check works

Compare with other Weather Forecast sites

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