Arivaca, AZ climate
Arivaca has mild winters and hot summers, with very little rain. A typical July afternoon reaches 94°, a January night drops to 32°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Arivaca feels like
Winter
Spring
Summer
Fall
Arivaca weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 64° | 32° | 1.1" | 0 | 4 | 0 | 42° – 53° |
| February | 66° | 34° | 1.2" | 0 | 4 | 0 | 44° – 55° |
| March | 71° | 38° | 0.9" | 0.2" | 4 | 0 | 49° – 60° |
| April | 78° | 42° | 0.4" | 0 | 1 | 0 | 54° – 64° |
| May | 86° | 48° | 0.2" | 0 | 1 | 0 | 61° – 72° |
| June | 95° | 58° | 0.4" | 0 | 2 | 0 | 71° – 80° |
| July | 94° | 66° | 3.6" | 0 | 11 | 0 | 77° – 82° |
| August | 92° | 65° | 3.8" | 0 | 11 | 0 | 76° – 83° |
| September | 89° | 59° | 2.0" | 0 | 6 | 0 | 70° – 76° |
| October | 82° | 47° | 0.9" | 0 | 3 | 0 | 61° – 68° |
| November | 72° | 37° | 0.8" | 0.1" | 2 | 0 | 47° – 62° |
| December | 63° | 31° | 1.3" | 0.1" | 4 | 0 | 43° – 52° |
| Year | 79° | 46° | 16.4" | 0.4" | 51 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Arivaca
Arivaca gets 16 inches of rain and melted snow a year. August is the wettest month and May the driest. Rain or snow falls on about 51 days a year.
About 217 frost-free days a year
In half of years the last 32° night comes by April 5 and the first one by November 10. That leaves about 217 frost-free days for gardens, longer than 81% of U.S. towns.
Heating and cooling a home in Arivaca
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Arivaca, 58% of that work is heating and 42% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Arivaca compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Arivaca averaged 1.4° warmer than the 1900s. The biggest change is in March (+2.5°). The shift is larger than in 65% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Arivaca’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. November swings the most: between 1991 and 2020 its average temperature ranged from 47° to 62°. July is the most reliable, staying within 5°.
Common questions about Arivaca’s climate
What is the coldest month in Arivaca?
December, with a typical high of 63° and a low of 31°.
What is the hottest month in Arivaca?
June, with a typical high of 95° and a low of 58°. About 115 days a year reach 90°.
How much snow does Arivaca get?
Almost none. A normal year brings 0.4 inches.
When is the first frost in Arivaca?
In half of years the first 32° night comes by November 10, and the last spring frost by April 5.
What is the rainiest month in Arivaca?
August, with 3.8 inches of rain and melted snow. The year totals 16 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Arivaca itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Arivaca, AZ (1 mi, snow) and Tumacacori Nm, AZ (14 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.