When is air quality worst in Annapolis?

February carries the highest modelled PM2.5 of the year at about 16 µg/m³. The WHO 2021 annual guideline is 5 µg/m³. These are Copernicus CAMS model values, not station readings.

Annapolis weather by month

No monthly climate normals are on file for Annapolis.

We have no monthly climate normals for Annapolis. The city profile shows what we do have.

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where these numbers come from

· Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
· PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.

Last reviewed 2026-05-27. Full method, licences and the list of sources we rejected are on the methodology page.