Tacna, Arizona climate: Normal weather by month, frost dates and records
Tacna's normal year runs from 36°F December nights to 109°F August afternoons, with 3.8 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 22.8°C, December lows of 2°C, August highs of 43°C, 96 mm of precipitation a year.
- NOAA stationTacna (3 mi NE)
- Station IDUSC00028396
- Location32.72°N 113.92°W
- Elevation324 ft (99 m)
- Population (census place)457
On October 23, the normal high in Tacna is 89°F and the normal low 54°F, and the chance of measurable rain or snow is 3%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Tacna.
- Jan 71° 37°
- Feb 75° 41°
- Mar 82° 47°
- Apr 89° 53°
- May 97° 61°
- Jun 106° 69°
- Jul 109° 78°
- Aug 109° 79°
- Sep 104° 72°
- Oct 92° 57°
- Nov 79° 44°
- Dec 69° 36°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Tacna each month?
August is the warmest month, with normal highs of 109°F; December the coldest, with normal lows of 36°F. The most precipitation falls in February (0.56 in), the least in June (0.02 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 71°F | 37°F | 54.1°F | 0.44 | 2 | <1 | 7 | 10 h 10 min |
| February | 75°F | 41°F | 57.9°F | 0.56 | 2 | <1 | 3 | 11 h |
| March | 82°F | 47°F | 64.3°F | 0.41 | 2 | 6 | <1 | 12 h |
| April | 89°F | 53°F | 70.6°F | 0.09 | 1 | 14 | <1 | 13 h |
| May | 97°F | 61°F | 78.7°F | 0.08 | <1 | 25 | <1 | 13 h 50 min |
| June | 106°F | 69°F | 87.4°F | 0.02 | <1 | 29 | <1 | 14 h 20 min |
| July | 109°F | 78°F | 93.8°F | 0.42 | 2 | 31 | <1 | 14 h 10 min |
| August | 109°F | 79°F | 93.9°F | 0.43 | 2 | 31 | <1 | 13 h 20 min |
| September | 104°F | 72°F | 87.6°F | 0.41 | 2 | 30 | <1 | 12 h 30 min |
| October | 92°F | 57°F | 74.6°F | 0.23 | 1 | 20 | <1 | 11 h 30 min |
| November | 79°F | 44°F | 61.6°F | 0.32 | 1 | 2 | 2 | 10 h 30 min |
| December | 69°F | 36°F | 52.6°F | 0.38 | 2 | <1 | 9 | 10 h |
| Year (annual) | 90°F | 56°F | 73.1°F | 3.79 | 17 | 188 | 22 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 22°C | 3°C | 12.3°C | 11 mm |
| February | 24°C | 5°C | 14.4°C | 14 mm |
| March | 28°C | 8°C | 17.9°C | 10 mm |
| April | 32°C | 11°C | 21.4°C | 2 mm |
| May | 36°C | 16°C | 25.9°C | 2 mm |
| June | 41°C | 21°C | 30.8°C | 1 mm |
| July | 43°C | 26°C | 34.3°C | 11 mm |
| August | 43°C | 26°C | 34.4°C | 11 mm |
| September | 40°C | 22°C | 30.9°C | 10 mm |
| October | 33°C | 14°C | 23.7°C | 6 mm |
| November | 26°C | 7°C | 16.4°C | 8 mm |
| December | 21°C | 2°C | 11.4°C | 10 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00028396; 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.
When is the best weather to visit Tacna?
Normal highs sit between 65°F and 85°F in January, February, March, November and December. Of those, November has the fewest days with rain (1).
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 USC00028396.
When is the last frost in Tacna?
In Tacna, the last spring frost (32°F) comes after February 13 in half of years and after March 5 in one year in ten; the first autumn frost comes before December 1 in half of years and before November 14 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
- February 131 year in 10 after March 5; 9 in 10 after January 19
- First autumn frost, half of years before
- December 11 year in 10 before November 14; 9 in 10 before December 17
NOAA puts the median frost-free season at 288 days, and the season without a hard freeze (28°F) at 324 days.
A hard freeze (28°F) comes after January 23 in half of springs and before December 11 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Tacna in zone 9b in ZIP code 85352, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Tacna's NOAA station is in zone 9a: the coldest night of a typical year reaches 23°F (26 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Arizona · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00028396; 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 in Tacna?
In a normal year in Tacna, 188 days a year reach 90°F (126 of them 100°F or more), 22 nights fall to 32°F or colder and 17 days bring measurable precipitation.
- Days at 90°F or more
- 188a normal year
- Days at 100°F or more
- 126a normal year
- Nights at 32°F or colder
- 22a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 17a normal year
The highest temperature in this station's record (since 1969) is 126°F, on July 28, 1995; the lowest is 13°F, on January 15, 2007.
The wettest calendar year on that record is 1984, with 12.84 in.
Source: NOAA NCEI 1991-2020 annual normals, station USC00028396; records: ACIS (NOAA Regional Climate Centers), station USC00028396. Records use complete months only; a month missing more than three days is left out.
How sunny is Tacna?
Over a year 94% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Tacna, 6.0 kWh per square metre a day. June is the sunniest month (97%) and December the cloudiest (88%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 89% | 3.6 |
| February | 90% | 4.6 |
| March | 92% | 6.0 |
| April | 95% | 7.4 |
| May | 96% | 8.2 |
| June | 97% | 8.5 |
| July | 93% | 7.5 |
| August | 94% | 7.1 |
| September | 95% | 6.2 |
| October | 95% | 5.1 |
| November | 92% | 3.9 |
| December | 88% | 3.3 |
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 much heating and cooling does Tacna need?
A normal year in Tacna brings 1,190 heating degree days, 78% fewer than the median U.S. place (5,373), and 4,176 cooling degree days, 4.6 times the median (908). Two months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 8,521 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 339 | 1 |
| February | 205 | 6 |
| March | 87 | 67 |
| April | 20 | 189 |
| May | 1 | 425 |
| June | 0 | 672 |
| July | 0 | 893 |
| August | 0 | 896 |
| September | 0 | 680 |
| October | 10 | 306 |
| November | 145 | 42 |
| December | 383 | 0 |
| Year (annual) | 1,190 | 4,176 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00028396. 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.
Has Tacna been warmer than normal lately?
2025 averaged 74.8°F, 1.7°F above the 1991-2020 normal of 73.1°F. 3 of the 3 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2022 | 73.8°F | +0.8°F | 1.69 |
| 2024 | 74.7°F | +1.6°F | 3.12 |
| 2025 | 74.8°F | +1.7°F | 7.07 |
Over 46 complete years from 1970 to 2025, the station's annual mean temperature rose at a fitted 5.8°F per century (+0.32°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00028396; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Tacna's climate compare?
Tacna is warmer than 84 of the other 96 places with their own NOAA record in Arizona, and wetter than 2. Across the 7,247 U.S. stations with normals, its annual mean of 73.1°F is warmer than 97%.
In the Köppen classification computed from these normals, Tacna is BWh: hot desert. 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 Tacna share this climate record?
Wellton Hills has no NOAA station with 1991-2020 normals of its 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.
- Wellton Hills, AZ249 people · 15 mi SW
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 Tacna's climate
What is the coldest month in Tacna?
December, with a normal high of 69°F and a normal low of 36°F. The warmest is August (109°F by day, 79°F at night).
Does it snow in Tacna?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Tacna?
February, with 0.56 in of precipitation in a normal year; the driest is June with 0.02 in.
What plant hardiness zone is Tacna in?
The USDA's 2023 map puts Tacna in zone 9b in ZIP code 85352, the nearest ZIP area. By the same method at Tacna's NOAA station, the coldest night of a typical year reaches 23°F (26 years, 1991-2020): zone 9a.
How late can frost come in Tacna?
In half of years the last 32°F night comes after February 13; in one year in ten it comes after March 5. Waiting until March 5 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Arizona climateThe statewide normals and every place in the state
- Yuma (27 mi ENE), AZ17 miles from this station, 73.2°F a year
- Yuma Proving Ground, AZ29 miles from this station, 74.8°F a year
- Dateland, AZ30 miles from this station, 72.5°F a year
- Kofa Mine, AZ38 miles from this station, 74.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made