Climate Comfort Score
80/100
Excellent
NOAA 1991–2020 normals 74°F annual avg Public-domain federal data
Ajo, AZ Climate
Explore average temperature, rainfall, and comfort score sourced from NOAA NCEI's 1991–2020 climate normals →
- 74°F
- Avg annual temp
- 80/100
- Comfort score
- 7.0"
- Annual precip
- 345d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Ajo
Ajo, Arizona averages 74°F a year and scores 80/100 on the comfort index - excellent, milder than 82% of U.S. cities.
- 74°F
- annual average temperature (NOAA normal)
- 80/100
- comfort score, milder than 82% of U.S. cities
- 7.0"
- precipitation, annual total
- 345 days
- growing season, frost-free days
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
74°F (23°C)
Avg High
86°F
Avg Low
61°F
Annual Precip
7.0"
Annual Snow
0.1"
Comfort Score
80/100
Excellent
Avg Annual Temperature
74°F
30-year mean (NOAA NCEI)
Annual Precipitation
7.0"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Ajo) 80.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Ajo area.
How Ajo compares to every U.S. city
Ajo's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
80 Top 18% higher than 82% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Ajo
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Ajo captures average conditions across the spread shown, the most recent decade is warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 68°F (20°C) | 45°F (7°C) | 56°F (13°C) | 0.7" | 0.1" | 0.8 | 0.0 |
| February | 71°F (21°C) | 48°F (9°C) | 59°F (15°C) | 0.8" | 0.0" | 0.4 | 0.1 |
| March | 77°F (25°C) | 52°F (11°C) | 65°F (18°C) | 0.8" | 0.0" | 0.0 | 2.6 |
| April | 84°F (29°C) | 57°F (14°C) | 71°F (22°C) | 0.2" | 0.0" | 0.0 | 8.7 |
| May | 92°F (33°C) | 66°F (19°C) | 79°F (26°C) | 0.1" | 0.0" | 0.0 | 20.2 |
| June | 101°F (38°C) | 74°F (23°C) | 88°F (31°C) | 0.1" | 0.0" | 0.0 | 28.5 |
| July | 104°F (40°C) | 80°F (27°C) | 92°F (33°C) | 0.6" | 0.0" | 0.0 | 30.6 |
| August | 103°F (39°C) | 79°F (26°C) | 91°F (33°C) | 1.4" | 0.0" | 0.0 | 30.6 |
| September | 99°F (37°C) | 74°F (24°C) | 87°F (30°C) | 0.8" | 0.0" | 0.0 | 28.0 |
| October | 89°F (32°C) | 64°F (18°C) | 77°F (25°C) | 0.4" | 0.0" | 0.0 | 16.4 |
| November | 77°F (25°C) | 51°F (11°C) | 64°F (18°C) | 0.5" | 0.0" | 0.1 | 2.0 |
| December | 67°F (19°C) | 43°F (6°C) | 55°F (13°C) | 0.6" | 0.0" | 0.8 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 0.7"
Snow: 0.1"
2.2 days with precipitation
February 0.8"
2.7 days with precipitation
March 0.8"
2.1 days with precipitation
April 0.2"
0.9 days with precipitation
May 0.1"
0.6 days with precipitation
June 0.1"
0.4 days with precipitation
July 0.6"
2.9 days with precipitation
August 1.4"
4.6 days with precipitation
September 0.8"
2.1 days with precipitation
October 0.4"
1.4 days with precipitation
November 0.5"
0.8 days with precipitation
December 0.6"
2.5 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
December 21
50% probability date
Last Spring Freeze
January 10
50% probability date
Growing Season
345 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,041
Higher = more heating needed
Cooling Degree Days
4,179
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
What Ajo's climate means for you
Ajo runs 74°F a year - peaking in July, coldest in December.
- Gardeners get about 345 frost-free days, with the last spring freeze near January 10 - plan the planting calendar around it, not the regional average.
- Energy bills track 1,041 heating and 4,179 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Ajo, AZ
The NOAA 1991–2020 climate normals describe Ajo, Arizona as a location with an annual average temperature of 74°F, ranging from a mean daily high of 86°F to a mean daily low of 61°F. July is typically the warmest month of the year, while December is the coldest. These thirty-year averages, computed from station USC00020080, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.
Beyond temperature, Ajo averages 7.0 inches of precipitation annually, with negligible snowfall - a real factor for anyone planning to live, garden, or travel here. The frost-free season averages 345 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near January 10 and the first fall freeze near December 21. Turning to energy use, 1,041 heating degree days and 4,179 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Ajo scores 80/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. For planning purposes, look to the monthly tables above: shoulder seasons bring the mildest highs and lows, summer brings July-driven heat, and deep winter brings December-driven cold. Treat every figure here as a thirty-year average rather than a forecast - individual years routinely run warmer, cooler, wetter, or drier than the normal.
Frequently Asked Questions
What is the average temperature in Ajo, AZ? ▼
The average annual temperature in Ajo, Arizona is 74°F. The warmest month averages 104°F (40°C) and the coldest averages 43°F (6°C).
How much rain does Ajo get? ▼
Ajo receives 7.0 inches of precipitation annually, including 0.1 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Ajo? ▼
Ajo has a climate comfort score of 80/100 (Excellent), milder than 82% of U.S. cities in the PlainClimate database.
When is the growing season in Ajo? ▼
Ajo has approximately 345 frost-free days per year, with the last spring freeze around January 10 and the first fall freeze around December 21.
How much energy does heating and cooling require in Ajo? ▼
Ajo has 1,041 heating degree days and 4,179 cooling degree days annually, a cooling-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Ajo climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00020080 near Ajo.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00020080. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.