Waltham, MA Weather & Climate Normals
Waltham's real weather, in one number
Waltham, MA scores 50/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Waltham's hottest and coldest months
Waltham's hottest month is Jul, averaging 74°F; its coldest is Jan, averaging 28°F, a 46.1°F swing across the year, one of the widest gaps in this dataset.
Rain and snow in Waltham
Over a typical year, Waltham sees about 42.6in of precipitation a year across roughly 141 days with measurable rain or snow. That station has no snowfall reading, so none is shown rather than assumed.
Where Waltham ranks
Waltham ranks 1654 of 4876 US cities in this dataset for comfort score, and 6 of 58 within MA. About 65,849 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from BEDFORD HANSCOM FLD, MA US, 6.1 miles from Waltham, not a prediction for any specific day.
More on how this is worked out
Why some cities show no snow or rain figure · How the comfort score is calculated