Tucson weather in April
In April, Tucson sees average daytime highs of 80°F and overnight lows near 55°F, with 0.2 in of precipitation across 1.4 wet days and about 12.8 hours of daylight. It is the 7th-warmest and 10th-wettest month of the year here.
Highs climb over the month, from about 77°F in the first days to 84°F by the end. The sky is clear or mostly clear about 75% of the time in April, and the air most often feels dry.
Daylight stretches from about 12 h 18 min at the start of April to 13 h 12 min by month's end. Set against the rest of the year, April is Tucson's 4th-clearest and 1st-windiest month. For the whole year in context, see Tucson's year-round climate.
- Daytime high
- 80°
- 7th warmest
- Overnight low
- 55°
- 6th coldest
- Precipitation
- 0.2 in
- 1.4 wet days
- Daylight
- 12 h 48 min
- 6:00 AM – 6:48 PM
- Cloud cover
- 24%
- 4th clearest
- Wind
- 7 mph
- 1st windiest
- Solar energy
- 7.56 kWh/m²
- Travel score
- 8.3
- out of 10
Tucson is city in and county seat of Pima County, Arizona, United States.
- Density
- 906/km²
- people per km²
- Founded
- 1775
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in April
Highs climb over the month, from about 77°F in the first days to 84°F by the end.
A typical April day in Tucson reaches about 80°F in the afternoon and slips back to 55°F overnight — a 26°F spread between the day's warmth and the night's chill. On most days the high lands between 69°F and 90°F. Set against its neighbours, April runs about 7°F warmer than March and about 9°F cooler than May.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 76 | 76 | 77 | 77 | 77 | 77 | 78 | 78 | 78 | 78 | 79 | 79 | 79 | 80 | 80 | 80 | 81 | 81 | 81 | 82 | 82 | 82 | 83 | 83 | 83 | 84 | 84 | 84 | 85 | 85 |
| Avg low (°F) | 51 | 51 | 52 | 52 | 52 | 52 | 52 | 53 | 53 | 53 | 53 | 53 | 53 | 54 | 54 | 54 | 55 | 55 | 55 | 55 | 56 | 56 | 56 | 57 | 57 | 57 | 58 | 58 | 58 | 59 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 76 | 51 |
| 2 | 76 | 51 |
| 3 | 77 | 52 |
| 4 | 77 | 52 |
| 5 | 77 | 52 |
| 6 | 77 | 52 |
| 7 | 78 | 52 |
| 8 | 78 | 53 |
| 9 | 78 | 53 |
| 10 | 78 | 53 |
| 11 | 79 | 53 |
| 12 | 79 | 53 |
| 13 | 79 | 53 |
| 14 | 80 | 54 |
| 15 | 80 | 54 |
| 16 | 80 | 54 |
| 17 | 81 | 55 |
| 18 | 81 | 55 |
| 19 | 81 | 55 |
| 20 | 82 | 55 |
| 21 | 82 | 56 |
| 22 | 82 | 56 |
| 23 | 83 | 56 |
| 24 | 83 | 57 |
| 25 | 83 | 57 |
| 26 | 84 | 57 |
| 27 | 84 | 58 |
| 28 | 84 | 58 |
| 29 | 85 | 58 |
| 30 | 85 | 59 |
How April really feels in Tucson
Once humidity and wind are folded in, April averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Tucson weather by month
How April compares with the rest of the year at a glance. April is the 7th-warmest and 10th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 64° / 41° | 1.1 | 4 | 10.1 | 7.0 |
| Feb | 67° / 44° | 1.1 | 3.9 | 10.8 | 7.3 |
| Mar | 73° / 49° | 0.7 | 3 | 11.8 | 8.4 |
| Apr | 80° / 55° | 0.2 | 1.4 | 12.8 | 8.3 |
| May | 89° / 63° | 0.1 | 0.8 | 13.6 | 5.5 |
| Jun | 98° / 72° | 0.2 | 1.2 | 14.1 | 2.3 |
| Jul | 98° / 77° | 1.3 | 7.8 | 13.9 | 2.0 |
| Aug | 96° / 76° | 1.3 | 7.5 | 13.2 | 2.5 |
| Sep | 92° / 71° | 1.0 | 3.7 | 12.2 | 4.0 |
| Oct | 84° / 60° | 0.6 | 2.3 | 11.2 | 7.2 |
| Nov | 72° / 49° | 0.7 | 2.5 | 10.3 | 8.4 |
| Dec | 63° / 41° | 1.2 | 4.2 | 9.9 | 6.7 |
Cloud cover in April
The sky is clear or mostly clear about 75% of the time in April.
Beyond those clear spells, partly cloudy skies cover about 9% of April, with mostly cloudy or overcast conditions the remaining 17%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 78 | 79 | 80 | 80 | 80 | 80 | 80 | 81 | 81 | 81 | 81 | 82 | 82 | 83 | 83 | 83 | 84 | 84 | 85 | 85 | 85 | 86 | 86 | 86 | 86 | 86 | 87 | 87 | 87 | 87 |
| Cloudier (%) | 22 | 21 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 18 | 18 | 17 | 17 | 17 | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 78 | 22 |
| 2 | 79 | 21 |
| 3 | 80 | 20 |
| 4 | 80 | 20 |
| 5 | 80 | 20 |
| 6 | 80 | 20 |
| 7 | 80 | 20 |
| 8 | 81 | 19 |
| 9 | 81 | 19 |
| 10 | 81 | 19 |
| 11 | 81 | 19 |
| 12 | 82 | 18 |
| 13 | 82 | 18 |
| 14 | 83 | 17 |
| 15 | 83 | 17 |
| 16 | 83 | 17 |
| 17 | 84 | 16 |
| 18 | 84 | 16 |
| 19 | 85 | 15 |
| 20 | 85 | 15 |
| 21 | 85 | 15 |
| 22 | 86 | 14 |
| 23 | 86 | 14 |
| 24 | 86 | 14 |
| 25 | 86 | 14 |
| 26 | 86 | 14 |
| 27 | 87 | 13 |
| 28 | 87 | 13 |
| 29 | 87 | 13 |
| 30 | 87 | 13 |
Chance of precipitation in April
Tucson gets around 0.2 in of rain and snow over 1.4 wet days in April. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 5% and peaks near 7% on the wettest days, and about 0 day brings snow.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Rain chance (%) | |
|---|---|
| 1 | 7 |
| 2 | 7 |
| 3 | 6 |
| 4 | 6 |
| 5 | 6 |
| 6 | 6 |
| 7 | 6 |
| 8 | 5 |
| 9 | 5 |
| 10 | 5 |
| 11 | 5 |
| 12 | 5 |
| 13 | 5 |
| 14 | 5 |
| 15 | 4 |
| 16 | 4 |
| 17 | 4 |
| 18 | 4 |
| 19 | 4 |
| 20 | 4 |
| 21 | 4 |
| 22 | 4 |
| 23 | 4 |
| 24 | 3 |
| 25 | 3 |
| 26 | 3 |
| 27 | 3 |
| 28 | 3 |
| 29 | 3 |
| 30 | 3 |
Humidity in April
Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, April lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Dry (%) | |
|---|---|
| 1 | 100 |
| 2 | 100 |
| 3 | 100 |
| 4 | 100 |
| 5 | 100 |
| 6 | 100 |
| 7 | 100 |
| 8 | 100 |
| 9 | 100 |
| 10 | 100 |
| 11 | 100 |
| 12 | 100 |
| 13 | 100 |
| 14 | 100 |
| 15 | 100 |
| 16 | 100 |
| 17 | 100 |
| 18 | 100 |
| 19 | 100 |
| 20 | 100 |
| 21 | 100 |
| 22 | 100 |
| 23 | 100 |
| 24 | 100 |
| 25 | 100 |
| 26 | 100 |
| 27 | 100 |
| 28 | 100 |
| 29 | 100 |
| 30 | 100 |
Wind in April
Winds average 7 mph in April, the windiest month of the year.
Across April, daily wind ranges from about 7 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | calm |
| 7 | 7 | calm |
| 8 | 7 | calm |
| 9 | 7 | calm |
| 10 | 7 | calm |
| 11 | 7 | calm |
| 12 | 7 | calm |
| 13 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 7 | calm |
| 19 | 7 | calm |
| 20 | 7 | calm |
| 21 | 7 | calm |
| 22 | 7 | calm |
| 23 | 7 | calm |
| 24 | 7 | calm |
| 25 | 7 | calm |
| 26 | 7 | calm |
| 27 | 7 | calm |
| 28 | 7 | calm |
| 29 | 7 | calm |
| 30 | 7 | calm |
Sunrise & sunset in April
Daylight runs from about 12 h 18 min at the start of April to 13 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 54 minutes over April. Sunrise moves from 6:19 AM to 5:44 AM, and sunset from 6:37 PM to 6:58 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.3 | 12.3 | 12.4 | 12.4 | 12.4 | 12.5 | 12.5 | 12.5 | 12.6 | 12.6 | 12.6 | 12.7 | 12.7 | 12.7 | 12.8 | 12.8 | 12.8 | 12.9 | 12.9 | 12.9 | 12.9 | 13.0 | 13.0 | 13.0 | 13.1 | 13.1 | 13.1 | 13.2 | 13.2 | 13.2 |
| Sunrise (AM) | 6:19 | 6:18 | 6:17 | 6:16 | 6:14 | 6:13 | 6:12 | 6:10 | 6:09 | 6:08 | 6:06 | 6:05 | 6:04 | 6:03 | 6:01 | 6:00 | 5:59 | 5:58 | 5:57 | 5:55 | 5:54 | 5:53 | 5:52 | 5:51 | 5:50 | 5:49 | 5:48 | 5:46 | 5:45 | 5:44 |
| Sunset (PM) | 6:37 | 6:38 | 6:39 | 6:39 | 6:40 | 6:41 | 6:41 | 6:42 | 6:43 | 6:43 | 6:44 | 6:45 | 6:46 | 6:46 | 6:47 | 6:48 | 6:48 | 6:49 | 6:50 | 6:51 | 6:51 | 6:52 | 6:53 | 6:53 | 6:54 | 6:55 | 6:56 | 6:56 | 6:57 | 6:58 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.3 | 6:19 | 6:37 |
| 2 | 12.3 | 6:18 | 6:38 |
| 3 | 12.4 | 6:17 | 6:39 |
| 4 | 12.4 | 6:16 | 6:39 |
| 5 | 12.4 | 6:14 | 6:40 |
| 6 | 12.5 | 6:13 | 6:41 |
| 7 | 12.5 | 6:12 | 6:41 |
| 8 | 12.5 | 6:10 | 6:42 |
| 9 | 12.6 | 6:09 | 6:43 |
| 10 | 12.6 | 6:08 | 6:43 |
| 11 | 12.6 | 6:06 | 6:44 |
| 12 | 12.7 | 6:05 | 6:45 |
| 13 | 12.7 | 6:04 | 6:46 |
| 14 | 12.7 | 6:03 | 6:46 |
| 15 | 12.8 | 6:01 | 6:47 |
| 16 | 12.8 | 6:00 | 6:48 |
| 17 | 12.8 | 5:59 | 6:48 |
| 18 | 12.9 | 5:58 | 6:49 |
| 19 | 12.9 | 5:57 | 6:50 |
| 20 | 12.9 | 5:55 | 6:51 |
| 21 | 12.9 | 5:54 | 6:51 |
| 22 | 13.0 | 5:53 | 6:52 |
| 23 | 13.0 | 5:52 | 6:53 |
| 24 | 13.0 | 5:51 | 6:53 |
| 25 | 13.1 | 5:50 | 6:54 |
| 26 | 13.1 | 5:49 | 6:55 |
| 27 | 13.1 | 5:48 | 6:56 |
| 28 | 13.2 | 5:46 | 6:56 |
| 29 | 13.2 | 5:45 | 6:57 |
| 30 | 13.2 | 5:44 | 6:58 |
Solar energy in April
Average shortwave solar energy reaching the ground each day in April, about 7.56 kWh/m².
For context, solar energy here swings from a low near 3.37 kWh/m² to a high of 8.35 kWh/m² in June across the year — April's 7.56 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 7.0 | 7.0 | 7.0 | 7.1 | 7.1 | 7.2 | 7.2 | 7.3 | 7.3 | 7.4 | 7.4 | 7.5 | 7.5 | 7.5 | 7.6 | 7.6 | 7.6 | 7.7 | 7.7 | 7.7 | 7.8 | 7.8 | 7.8 | 7.9 | 7.9 | 7.9 | 7.9 | 8.0 | 8.0 | 8.0 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 7.0 | Intense |
| 2 | 7.0 | Intense |
| 3 | 7.0 | Intense |
| 4 | 7.1 | Intense |
| 5 | 7.1 | Intense |
| 6 | 7.2 | Intense |
| 7 | 7.2 | Intense |
| 8 | 7.3 | Intense |
| 9 | 7.3 | Intense |
| 10 | 7.4 | Intense |
| 11 | 7.4 | Intense |
| 12 | 7.5 | Intense |
| 13 | 7.5 | Intense |
| 14 | 7.5 | Intense |
| 15 | 7.6 | Intense |
| 16 | 7.6 | Intense |
| 17 | 7.6 | Intense |
| 18 | 7.7 | Intense |
| 19 | 7.7 | Intense |
| 20 | 7.7 | Intense |
| 21 | 7.8 | Intense |
| 22 | 7.8 | Intense |
| 23 | 7.8 | Intense |
| 24 | 7.9 | Intense |
| 25 | 7.9 | Intense |
| 26 | 7.9 | Intense |
| 27 | 7.9 | Intense |
| 28 | 8.0 | Intense |
| 29 | 8.0 | Intense |
| 30 | 8.0 | Intense |
Is April a good time to visit Tucson?
Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
April is one of the better times to visit Tucson for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Tucson in April
From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In April, Tucson sees daytime highs around 80°F and nights near 55°F. Pack sun protection. Worth having: light clothes.
UV index in Tucson in April
Clear-sky midday UV in April peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Tucson peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 4 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 5 | 6 | 9 | 9 | 11 | 11 | 11 | 10 | 7 | 5 | 3 |
| Level | Moderate | Moderate | High | Very high | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 5 | Moderate |
| Mar | 6 | High |
| Apr | 9 | Very high |
| May | 9 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 10 | Very high |
| Oct | 7 | High |
| Nov | 5 | Moderate |
| Dec | 3 | Moderate |
Air quality in Tucson in April
Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.
Air quality in Tucson is worst in June — around 15 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (December, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 10 | 10 | 11 | 12 | 11 | 15 | 12 | 11 | 11 | 10 | 10 | 9 |
| Level | Good | Good | Good | Good | Good | Moderate | Moderate | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 10 | Good |
| Mar | 11 | Good |
| Apr | 12 | Good |
| May | 11 | Good |
| Jun | 15 | Moderate |
| Jul | 12 | Moderate |
| Aug | 11 | Good |
| Sep | 11 | Good |
| Oct | 10 | Good |
| Nov | 10 | Good |
| Dec | 9 | Good |
Where is Tucson?
Tucson sits at 32.2°N, 110.9°W, 2,490 ft above sea level, in United States. The nearest listed city is Catalina Foothills, 5.0 mi away.
Topography around Tucson
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Tucson.
Within 2 miles, the terrain around Tucson has only modest variations in elevation — a maximum elevation change of 157 ft around an average of 2,477 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 4,455 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,730 ft.
The land around Tucson is covered by artificial surfaces (88%) within 2 miles, artificial surfaces (46%) and shrubs (43%) within 10 miles, and shrubs (80%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Tucson (32.2217°, -110.9265°, elevation 2,490 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).