Lancaster averages 101.4 days a year above 90°F, with February the wettest month at 1.76 in of normal rain. The hottest day on record was 115°F on Jun 30, 2013; the coldest, 2°F on Dec 24, 1984. The single biggest 24-hour rain event recorded was 3.59 in on Aug 20, 2023.
Climate and Average Weather Year Round in Lancaster
Year-round temperature
In Lancaster, the warmest months are June through September, with average daily highs between 91°F and 98°F. The coldest stretch runs December through February, with highs between 58°F and 62°F and overnight lows reaching 30°F.
Rainfall through the year
Rainfall in Lancaster averages 0.6 in per month over the long run. February is the wettest at 1.8 in, while August is the driest at 0.0 in.
Days at 90 °F or hotter
Lancaster averages 101.4 days per year at 90 °F or hotter. The hottest year on record saw 139 such days (2020); the coolest just 15 (2026).
Precipitation this year
As of May 28, Lancaster has received 2.9 in of precipitation this year — 38% below the long-term normal for this point in the year (4.7 in).