Rio Rico climate — normals and trends
Rio Rico (United States) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 17.3 °C and it receives 354 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 June (26.1 °C on average) and the coldest is January (8.2 °C). Rainfall peaks in August.
Rio Rico averages 23 frost days, 102 hot days (≥ 30 °C) and 62 rainy days per year.
Rio Rico has warmed by +2.5 °C between 1940 and 2025, or +0.29 °C per decade. This trend is statistically significant.
The number of frost days there went from about 34 to 12 per year over the period.
The hottest day of the period reached 42.4 °C (on 19 June 2016) and the coldest -17.3 °C (on 9 December 1978).
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
Rio RicoArizona
- coords
- 31.47°, -110.98°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.3°C
Average daily high
24.4°C
Average daily low
10.7°C
Annual rainfall
354mm
Sunshine / day
11.2h
Mean relative humidity
42%
Average peak wind
16.6km/h
Seasonal range
17.9°C
Frost days (< 0 °C)
23 d/yr
Hot days (≥ 30 °C)
102 d/yr
Rainy days (≥ 1 mm)
62 d/yr
Annual snowfall
7.0 cm
Average feels-like high
21.9 °C
Average feels-like low
8.1 °C
Average peak gust
37.4 km/h
Tropical nights (≥ 20 °C)
37 d/yr
Solar radiation
21.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.61 · 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
42.4 °C
19 June 2016
Coldest day
-17.3 °C
9 December 1978
Wettest day
65 mm
11 October 2000
Windiest day
49.6 km/h
21 January 2010
Strongest gust
126.7 km/h
22 January 2010
Hottest feels-like
42.2 °C
22 July 2023
Coldest feels-like
-22.4 °C
9 December 1978
Snowiest day
15.8 cm
25 February 1987
Sunniest day
13.8 h
18 June 2013
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 | 15.8 °C | +0.3 °C | 7 mm | -22 mm |
| Feb | 22.1 °C | +5.1 °C | 1 mm | -23 mm |
| Mar | 21.4 °C | +1.9 °C | 19 mm | -4 mm |
| Apr | 24.9 °C | +1.1 °C | 2 mm | -7 mm |
| May | 29.3 °C | +0.9 °C | 2 mm | -3 mm |
| Jun | 35.0 °C | +1.7 °C | 21 mm | +12 mm |
| Jul | 33.5 °C | +1.2 °C | 88 mm | +10 mm |
| Aug | 34.4 °C | +3.7 °C | 31 mm | -48 mm |
| Sep | 31.0 °C | +1.1 °C | 48 mm | +13 mm |
| Oct | 27.6 °C | +1.9 °C | 51 mm | +31 mm |
| Nov | 22.9 °C | +2.8 °C | 29 mm | +12 mm |
| Dec | 21.9 °C | +5.9 °C | 9 mm | -22 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 Rio Rico?
Rio Rico has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 17.3 °C and it receives 354 mm of precipitation per year.
What is the hottest day ever recorded in Rio Rico?
The hottest day measured in Rio Rico between 1940 and 2025 was 19 June 2016, reaching 42.4 °C.
What is the coldest day in Rio Rico?
The coldest day measured in Rio Rico between 1940 and 2025 was 9 December 1978, at -17.3 °C.
Does it snow in Rio Rico?
Yes. Rio Rico gets on average 7.0 cm of snow per year and has around 23 frost days.
Has the climate of Rio Rico warmed?
Yes: Rio Rico warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Rio Rico?
The wettest day measured in Rio Rico between 1940 and 2025 was 11 October 2000, with 65 mm of rain in 24 hours.
What was the windiest day in Rio Rico?
The windiest day measured in Rio Rico between 1940 and 2025 was 21 January 2010, with winds reaching 49.6 km/h.
What is the warmest month in Rio Rico?
The warmest month in Rio Rico is June (26.1 °C on average); the coldest is January (8.2 °C).
How much does it rain in Rio Rico?
Rio Rico receives on average 354 mm of precipitation per year, spread over about 62 rainy days.
Is it sunny in Rio Rico?
Rio Rico gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.
What is the biggest single-day snowfall in Rio Rico?
The heaviest 24-hour snowfall measured in Rio Rico between 1940 and 2025 was 25 February 1987, with 15.8 cm.
Are there tropical nights in Rio Rico?
Yes: Rio Rico has on average 37 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Rio Rico?
In Rio Rico, between 1940 and 2025, the highest apparent temperature reached 42.2 °C on 22 July 2023, and the lowest was -22.4 °C on 9 December 1978.
Compare Rio Rico with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Rio Rico