Altoona sits at the base of the Allegheny Front at roughly 1,200 feet, where moist westerly air is forced up and over the escarpment. That upslope lift is the defining feature of the local climate (Köppen Dfb): more clouds, more snow showers, and quicker-changing weather than the valleys to the east.
Summers are warm rather than hot, with July highs in the low 80s and thunderstorms that build over the mountains on humid afternoons. Winters are cold and notably snowy for the elevation — around 45 inches a year — because even weak disturbances can squeeze out upslope snow showers along the Front. The higher terrain toward Cresson and the Horseshoe Curve routinely sees more than the city itself.
The main hazards are winter snow and ice — especially on the I-99 and US-22 mountain grades — dense fog on the ridges, and summer thunderstorms rolling off the high ground.
Climate normals (approximate)
- Warmest month: July — average high around 83 °F
- Coldest month: January — average low around 21 °F
- Annual precipitation: roughly 42 inches
- Annual snowfall: about 45 inches
- Climate type: humid continental (Köppen Dfb)
Common questions
- Why does Altoona get more snow than places at similar latitude?
- Upslope lift. Moist westerly winds are forced up the Allegheny Front, wringing out snow showers even from weak systems — the same effect that makes the ridge above the Horseshoe Curve snowier than the city below.
- How much does it snow in Altoona?
- About 45 inches a year on average, with the surrounding high terrain toward Cresson often exceeding that. Most falls between late November and March.
- What is winter driving like around Altoona?
- The I-99 and US-22 mountain grades can turn snowy or icy quickly when upslope showers set in, and dense ridge-top fog is common — conditions in town don't always match the summits.
Figures are long-term climate normals (roughly the 1991–2020 reference period) and are meant for context. The live readings at the top of this page always reflect current conditions.