Tumacacori National Monument, Arizona climate: Climate normals at a NOAA weather station
Tumacacori National Monument's normal year runs from 32°F December nights to 93°F July afternoons, with 15.9 inches of precipitation and less than an inch of snow (0.1 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 17.2°C, December lows of 0°C, July highs of 34°C, 405 mm of precipitation a year.
- NOAA stationTumacacori National Monument
- Station IDUSC00028865
- Location31.57°N 111.05°W
- Elevation3,267 ft (996 m)
On October 23, the normal high in Tumacacori National Monument is 79°F and the normal low 45°F, and the chance of measurable rain or snow is 8%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Tumacacori National Monument.
- Jan 63° 32°
- Feb 66° 34°
- Mar 72° 38°
- Apr 78° 43°
- May 86° 49°
- Jun 95° 59°
- Jul 93° 67°
- Aug 91° 66°
- Sep 89° 60°
- Oct 81° 48°
- Nov 71° 38°
- Dec 63° 32°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Tumacacori National Monument each month?
July is the warmest month, with normal highs of 93°F; December the coldest, with normal lows of 32°F. The most precipitation falls in July (3.79 in), the least in May (0.17 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 63°F | 32°F | 47.7°F | 1.15 | 4 | <1 | 17 | 10 h 20 min |
| February | 66°F | 34°F | 49.7°F | 1.07 | 4 | <1 | 12 | 11 h |
| March | 72°F | 38°F | 54.9°F | 0.81 | 3 | <1 | 6 | 12 h |
| April | 78°F | 43°F | 60.4°F | 0.31 | 2 | 2 | 2 | 13 h |
| May | 86°F | 49°F | 67.6°F | 0.17 | 1 | 13 | <1 | 13 h 40 min |
| June | 95°F | 59°F | 77.1°F | 0.47 | 2 | 27 | <1 | 14 h 10 min |
| July | 93°F | 67°F | 80.1°F | 3.79 | 11 | 25 | <1 | 14 h |
| August | 91°F | 66°F | 78.5°F | 3.35 | 10 | 23 | <1 | 13 h 20 min |
| September | 89°F | 60°F | 74.1°F | 1.83 | 5 | 18 | <1 | 12 h 20 min |
| October | 81°F | 48°F | 64.5°F | 1.09 | 3 | 6 | 1 | 11 h 30 min |
| November | 71°F | 38°F | 54.7°F | 0.89 | 2 | <1 | 6 | 10 h 30 min |
| December | 63°F | 32°F | 47.2°F | 1.02 | 4 | <1 | 16 | 10 h 10 min |
| Year (annual) | 79°F | 47°F | 63.0°F | 15.95 | 49 | 115 | 60 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 17°C | 0°C | 8.7°C | 29 mm |
| February | 19°C | 1°C | 9.8°C | 27 mm |
| March | 22°C | 3°C | 12.7°C | 21 mm |
| April | 26°C | 6°C | 15.8°C | 8 mm |
| May | 30°C | 10°C | 19.8°C | 4 mm |
| June | 35°C | 15°C | 25.1°C | 12 mm |
| July | 34°C | 19°C | 26.7°C | 96 mm |
| August | 33°C | 19°C | 25.8°C | 85 mm |
| September | 31°C | 15°C | 23.4°C | 46 mm |
| October | 27°C | 9°C | 18.1°C | 28 mm |
| November | 22°C | 3°C | 12.6°C | 23 mm |
| December | 17°C | 0°C | 8.4°C | 26 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00028865; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
Which months are mildest at Tumacacori National Monument?
Normal highs sit between 65°F and 85°F in February, March, April, October and November. Of those, April has the fewest days with rain (2).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00028865.
When is the last frost at Tumacacori National Monument?
In Tumacacori National Monument, the last spring frost (32°F) comes after April 5 in half of years and after April 25 in one year in ten; the first autumn frost comes before November 10 in half of years and before October 21 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 51 year in 10 after April 25; 9 in 10 after March 13
- First autumn frost, half of years before
- November 101 year in 10 before October 21; 9 in 10 before November 27
NOAA puts the median frost-free season at 217 days, and the season without a hard freeze (28°F) at 251 days.
A hard freeze (28°F) comes after March 12 in half of springs and before November 20 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Tumacacori National Monument in zone 8b in ZIP code 85640, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 8b: the coldest night of a typical year reaches 16°F (15 complete years).
Frost dates for every NOAA station in Arizona · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00028865; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get at Tumacacori National Monument?
In a normal year in Tumacacori National Monument, 115 days a year reach 90°F (22 of them 100°F or more), 60 nights fall to 32°F or colder and 49 days bring measurable precipitation.
- Days at 90°F or more
- 115a normal year
- Days at 100°F or more
- 22a normal year
- Nights at 32°F or colder
- 60a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 49a normal year
The highest temperature in this station's record (since 1946) is 113°F, on June 25, 1970; the lowest is 4°F, on January 12, 2013.
The wettest calendar year on that record is 1983, with 29.04 in; the snowiest season is 1978–79, with 9.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00028865; records: ACIS (NOAA Regional Climate Centers), station USC00028865. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Tumacacori National Monument?
Over a year 91% of the sunlight that would reach the ground under clear skies gets through the clouds at Tumacacori National Monument, 5.9 kWh per square metre a day. May is the sunniest month (96%) and July the cloudiest (83%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 88% | 3.8 |
| February | 87% | 4.7 |
| March | 91% | 6.2 |
| April | 94% | 7.6 |
| May | 96% | 8.3 |
| June | 95% | 8.3 |
| July | 83% | 6.8 |
| August | 86% | 6.5 |
| September | 90% | 6.0 |
| October | 93% | 5.3 |
| November | 91% | 4.1 |
| December | 87% | 3.4 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How many heating and cooling degree days does Tumacacori National Monument record?
A normal year at Tumacacori National Monument brings 2,441 heating degree days, 55% fewer than the median U.S. place (5,373), and 1,752 cooling degree days, 93% more than the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 5,195 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 538 | 0 |
| February | 427 | 0 |
| March | 317 | 3 |
| April | 163 | 23 |
| May | 46 | 125 |
| June | 1 | 363 |
| July | 0 | 468 |
| August | 0 | 419 |
| September | 3 | 277 |
| October | 85 | 70 |
| November | 312 | 5 |
| December | 550 | 0 |
| Year (annual) | 2,441 | 1,752 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00028865. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Have recent years at Tumacacori National Monument been warmer than normal?
Over 44 complete years from 1947 to 2018, the station's annual mean temperature rose at a fitted 3.5°F per century (+0.20°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Tumacacori National Monument's climate compare?
Tumacacori National Monument is warmer than 42 of the 97 places with their own NOAA record in Arizona, and wetter than 70. Across the 7,247 U.S. stations with normals, its annual mean of 63.0°F is warmer than 83%.
In the Köppen classification computed from these normals, Tumacacori National Monument is BSk: cold semi-arid steppe. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Tumacacori National Monument share this climate record?
4 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Tubac, AZ1,247 people · 3 mi N
- Arivaca, AZ494 people · 14 mi W
- Tumacacori-Carmen, AZ162 people · 0 mi NE
- Amado, AZ41 people · 9 mi N
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Tumacacori National Monument's climate
What is the coldest month at Tumacacori National Monument?
December, with a normal high of 63°F and a normal low of 32°F. The warmest is July (93°F by day, 67°F at night).
Does it snow at Tumacacori National Monument?
Rarely: NOAA's normal is 0.1 inch a year.
What is the rainiest month at Tumacacori National Monument?
July, with 3.79 in of precipitation in a normal year; the driest is May with 0.17 in.
What plant hardiness zone is Tumacacori National Monument in?
The USDA's 2023 map puts Tumacacori National Monument in zone 8b in ZIP code 85640, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 16°F (15 years, 1991-2020): zone 8b.
How late can frost come at Tumacacori National Monument?
In half of years the last 32°F night comes after April 5; in one year in ten it comes after April 25. Waiting until April 25 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Arizona climateThe statewide normals and every place in the state
- Rio Rico, AZ9 miles from this station, 62.4°F a year
- Nogales, AZ16 miles from this station, 64.8°F a year
- Santa Rita Experiment Range, AZ18 miles from this station, 65.3°F a year
- Green Valley, AZ23 miles from this station, 68.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made