Oro Valley climate — normals and trends
Oro Valley (United States) has a hot semi-arid climate (BSh) under the Köppen-Geiger classification. Its mean annual temperature is 19.2 °C and it receives 363 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 (29.3 °C on average) and the coldest is January (9.0 °C). Rainfall peaks in August.
Oro Valley averages 11 frost days, 135 hot days (≥ 30 °C) and 58 rainy days per year.
Oro Valley has warmed by +2.6 °C between 1940 and 2025, or +0.31 °C per decade. This trend is statistically significant.
The number of frost days there went from about 19 to 3 per year over the period.
The hottest day of the period reached 43.7 °C (on 19 June 2016) and the coldest -18.6 °C (on 23 December 1990).
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
Oro ValleyArizona
- coords
- 32.39°, -110.97°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
19.2°C
Average daily high
25.5°C
Average daily low
13.2°C
Annual rainfall
363mm
Sunshine / day
11.3h
Mean relative humidity
39%
Average peak wind
15.5km/h
Seasonal range
20.3°C
Frost days (< 0 °C)
11 d/yr
Hot days (≥ 30 °C)
135 d/yr
Rainy days (≥ 1 mm)
58 d/yr
Annual snowfall
5.0 cm
Average feels-like high
23.3 °C
Average feels-like low
10.6 °C
Average peak gust
34.7 km/h
Tropical nights (≥ 20 °C)
99 d/yr
Solar radiation
21.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.67 · 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
43.7 °C
19 June 2016
Coldest day
-18.6 °C
23 December 1990
Wettest day
59 mm
8 August 1944
Windiest day
46.9 km/h
10 December 1949
Strongest gust
111.6 km/h
10 December 1949
Hottest feels-like
43.2 °C
26 June 1990
Coldest feels-like
-24.3 °C
23 December 1990
Snowiest day
8.0 cm
16 November 1958
Sunniest day
14.0 h
25 June 1946
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 | 15.7 °C | +0.3 °C | 6 mm | -34 mm |
| Feb | 22.0 °C | +4.8 °C | 1 mm | -33 mm |
| Mar | 21.8 °C | +1.7 °C | 41 mm | +10 mm |
| Apr | 25.7 °C | +0.9 °C | 2 mm | -9 mm |
| May | 30.2 °C | +0.5 °C | 3 mm | -2 mm |
| Jun | 36.4 °C | +1.4 °C | 8 mm | +3 mm |
| Jul | 35.9 °C | +1.0 °C | 41 mm | -15 mm |
| Aug | 37.0 °C | +3.5 °C | 15 mm | -48 mm |
| Sep | 32.5 °C | +0.4 °C | 67 mm | +34 mm |
| Oct | 28.0 °C | +1.2 °C | 39 mm | +16 mm |
| Nov | 22.9 °C | +2.6 °C | 47 mm | +23 mm |
| Dec | 21.0 °C | +5.1 °C | 6 mm | -35 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 Oro Valley?
Oro Valley has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 19.2 °C and it receives 363 mm of precipitation per year.
What is the hottest day ever recorded in Oro Valley?
The hottest day measured in Oro Valley between 1940 and 2025 was 19 June 2016, reaching 43.7 °C.
What is the coldest day in Oro Valley?
The coldest day measured in Oro Valley between 1940 and 2025 was 23 December 1990, at -18.6 °C.
Does it snow in Oro Valley?
Yes. Oro Valley gets on average 5.0 cm of snow per year and has around 11 frost days.
Has the climate of Oro Valley warmed?
Yes: Oro Valley warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Oro Valley?
The wettest day measured in Oro Valley between 1940 and 2025 was 8 August 1944, with 59 mm of rain in 24 hours.
What was the windiest day in Oro Valley?
The windiest day measured in Oro Valley between 1940 and 2025 was 10 December 1949, with winds reaching 46.9 km/h.
What is the warmest month in Oro Valley?
The warmest month in Oro Valley is July (29.3 °C on average); the coldest is January (9.0 °C).
How much does it rain in Oro Valley?
Oro Valley receives on average 363 mm of precipitation per year, spread over about 58 rainy days.
Is it sunny in Oro Valley?
Oro Valley gets on average 11.3 hours of sunshine per day, roughly 4,125 hours per year over 1940-2025.
What is the biggest single-day snowfall in Oro Valley?
The heaviest 24-hour snowfall measured in Oro Valley between 1940 and 2025 was 16 November 1958, with 8.0 cm.
Are there tropical nights in Oro Valley?
Yes: Oro Valley has on average 99 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Oro Valley?
In Oro Valley, between 1940 and 2025, the highest apparent temperature reached 43.2 °C on 26 June 1990, and the lowest was -24.3 °C on 23 December 1990.
Compare Oro Valley with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Oro Valley