Altoona climate — normals and trends
Altoona (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.0 °C and it receives 1,109 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (21.1 °C on average) and the coldest is January (-3.7 °C). Rainfall peaks in May.
Altoona averages 126 frost days, 8 hot days (≥ 30 °C) and 141 rainy days per year.
Altoona has warmed by +2.0 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 140 to 112 per year over the period.
The hottest day of the period reached 35.8 °C (on 16 July 1988) and the coldest -28.5 °C (on 21 January 1985).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
AltoonaPennsylvania
- coords
- 40.52°, -78.39°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.0°C
Average daily high
13.8°C
Average daily low
4.4°C
Annual rainfall
1,109mm
Sunshine / day
8.4h
Mean relative humidity
74%
Average peak wind
16.5km/h
Seasonal range
24.8°C
Frost days (< 0 °C)
126 d/yr
Hot days (≥ 30 °C)
8 d/yr
Rainy days (≥ 1 mm)
141 d/yr
Annual snowfall
106.2 cm
Average feels-like high
12.0 °C
Average feels-like low
1.6 °C
Average peak gust
42.2 km/h
Tropical nights (≥ 20 °C)
7 d/yr
Solar radiation
14.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.43 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
35.8 °C
16 July 1988
Coldest day
-28.5 °C
21 January 1985
Wettest day
116 mm
22 June 1972
Windiest day
52.2 km/h
3 April 1975
Strongest gust
126.0 km/h
13 November 2003
Hottest feels-like
40.9 °C
15 July 1995
Coldest feels-like
-36.9 °C
21 January 1985
Snowiest day
45.6 cm
13 March 1993
Sunniest day
14.7 h
2 July 2024
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -2.4 °C | -2.6 °C | 39 mm | -37 mm |
| Feb | 2.4 °C | +0.5 °C | 84 mm | +8 mm |
| Mar | 11.9 °C | +5.0 °C | 72 mm | -30 mm |
| Apr | 16.0 °C | +2.2 °C | 115 mm | +11 mm |
| May | 18.5 °C | -0.8 °C | 227 mm | +106 mm |
| Jun | 25.3 °C | +1.4 °C | 142 mm | +36 mm |
| Jul | 28.2 °C | +2.0 °C | 103 mm | +6 mm |
| Aug | 25.1 °C | -0.4 °C | 43 mm | -46 mm |
| Sep | 24.3 °C | +2.6 °C | 70 mm | -20 mm |
| Oct | 16.2 °C | +0.9 °C | 78 mm | -4 mm |
| Nov | 8.5 °C | +0.1 °C | 64 mm | -20 mm |
| Dec | 1.6 °C | -0.8 °C | 70 mm | -12 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Altoona?
Altoona has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 9.0 °C and it receives 1,109 mm of precipitation per year.
What is the hottest day ever recorded in Altoona?
The hottest day measured in Altoona between 1940 and 2025 was 16 July 1988, reaching 35.8 °C.
What is the coldest day in Altoona?
The coldest day measured in Altoona between 1940 and 2025 was 21 January 1985, at -28.5 °C.
Does it snow in Altoona?
Yes. Altoona gets on average 106.2 cm of snow per year and has around 126 frost days.
Has the climate of Altoona warmed?
Yes: Altoona warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Altoona?
The wettest day measured in Altoona between 1940 and 2025 was 22 June 1972, with 116 mm of rain in 24 hours.
What was the windiest day in Altoona?
The windiest day measured in Altoona between 1940 and 2025 was 3 April 1975, with winds reaching 52.2 km/h.
What is the warmest month in Altoona?
The warmest month in Altoona is July (21.1 °C on average); the coldest is January (-3.7 °C).
How much does it rain in Altoona?
Altoona receives on average 1,109 mm of precipitation per year, spread over about 141 rainy days.
Is it sunny in Altoona?
Altoona gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Altoona?
The heaviest 24-hour snowfall measured in Altoona between 1940 and 2025 was 13 March 1993, with 45.6 cm.
Are there tropical nights in Altoona?
Yes: Altoona has on average 7 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Altoona?
In Altoona, between 1940 and 2025, the highest apparent temperature reached 40.9 °C on 15 July 1995, and the lowest was -36.9 °C on 21 January 1985.
Compare Altoona with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Altoona