Question 1

What is the weather like in Missoula by month?

Accepted Answer

No monthly climate normals are on file for Missoula.

Question 2

When is air quality worst in Missoula?

Accepted Answer

September carries the highest modelled PM2.5 of the year at about 12 µg/m³. The WHO 2021 annual guideline is 5 µg/m³. These are model values, not station readings.

Missoula weather by month