Tracy weather in March
In March, Tracy sees average daytime highs of 65°F and overnight lows near 46°F, with 2.6 in of rain across 8.9 wet days and about 11.7 hours of daylight. It is the 8th-warmest and 4th-wettest month of the year here.
Highs climb over the month, from about 62°F in the first days to 67°F by the end. The sky is clear or mostly clear about 37% of the time in March, and the air most often feels dry.
Daylight stretches from about 11 h 06 min at the start of March to 12 h 18 min by month's end. Set against the rest of the year, March is Tracy's 9th-clearest and 5th-windiest month. For the whole year in context, see Tracy's year-round climate.
- Daytime high
- 65°
- 8th warmest
- Overnight low
- 46°
- 5th coldest
- Rainfall
- 2.6 in
- 8.9 wet days
- Daylight
- 11 h 42 min
- 6:24 AM – 6:06 PM
- Cloud cover
- 53%
- 9th clearest
- Wind
- 5 mph
- 5th windiest
- Solar energy
- 4.78 kWh/m²
- Travel score
- 6.2
- out of 10
Tracy is city in San Joaquin County, California, United States.
- Density
- 1,509/km²
- people per km²
- Founded
- 1910
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in March
Highs climb over the month, from about 62°F in the first days to 67°F by the end.
A typical March day in Tracy reaches about 65°F in the afternoon and slips back to 46°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 56°F and 74°F. Set against its neighbours, March runs about 5°F warmer than February and about 5°F cooler than April.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 62 | 62 | 62 | 63 | 63 | 63 | 64 | 64 | 64 | 64 | 64 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 66 | 66 | 66 | 66 | 66 | 66 | 66 | 66 | 66 | 67 | 67 | 67 | 67 |
| Avg low (°F) | 44 | 44 | 44 | 44 | 44 | 45 | 45 | 45 | 45 | 45 | 45 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 62 | 44 |
| 2 | 62 | 44 |
| 3 | 62 | 44 |
| 4 | 63 | 44 |
| 5 | 63 | 44 |
| 6 | 63 | 45 |
| 7 | 64 | 45 |
| 8 | 64 | 45 |
| 9 | 64 | 45 |
| 10 | 64 | 45 |
| 11 | 64 | 45 |
| 12 | 65 | 46 |
| 13 | 65 | 46 |
| 14 | 65 | 46 |
| 15 | 65 | 46 |
| 16 | 65 | 46 |
| 17 | 65 | 46 |
| 18 | 65 | 46 |
| 19 | 66 | 46 |
| 20 | 66 | 46 |
| 21 | 66 | 46 |
| 22 | 66 | 46 |
| 23 | 66 | 46 |
| 24 | 66 | 46 |
| 25 | 66 | 46 |
| 26 | 66 | 46 |
| 27 | 66 | 46 |
| 28 | 67 | 46 |
| 29 | 67 | 46 |
| 30 | 67 | 46 |
| 31 | 67 | 46 |
Tracy weather by month
How March compares with the rest of the year at a glance. March is the 8th-warmest and 4th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 57° / 41° | 3.3 | 9.1 | 9.7 | 4.2 |
| Feb | 60° / 43° | 3.2 | 8.7 | 10.5 | 5.0 |
| Mar | 65° / 46° | 2.6 | 8.9 | 11.7 | 6.2 |
| Apr | 70° / 48° | 1.3 | 5 | 12.9 | 7.5 |
| May | 77° / 53° | 0.7 | 3.1 | 14 | 8.4 |
| Jun | 84° / 57° | 0.1 | 0.8 | 14.6 | 7.5 |
| Jul | 88° / 60° | 0.0 | 0.2 | 14.3 | 6.2 |
| Aug | 87° / 60° | 0.1 | 0.2 | 13.5 | 6.5 |
| Sep | 83° / 57° | 0.1 | 0.6 | 12.3 | 7.8 |
| Oct | 75° / 52° | 0.8 | 2.7 | 11 | 8.6 |
| Nov | 64° / 46° | 1.5 | 5.5 | 10 | 6.5 |
| Dec | 57° / 41° | 3.0 | 8.3 | 9.4 | 4.2 |
Cloud cover in March
The sky is clear or mostly clear about 37% of the time in March.
Beyond those clear spells, partly cloudy skies cover about 13% of March, with mostly cloudy or overcast conditions the remaining 50%.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 50 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 50 | 49 | 48 | 47 | 47 | 47 | 48 | 48 | 48 | 48 | 49 | 50 | 51 | 52 | 52 | 54 | 54 | 54 | 55 |
| Cloudier (%) | 50 | 49 | 49 | 49 | 49 | 49 | 49 | 49 | 49 | 49 | 49 | 49 | 50 | 51 | 52 | 53 | 53 | 53 | 52 | 52 | 52 | 52 | 51 | 50 | 49 | 48 | 48 | 46 | 46 | 46 | 45 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 50 | 50 |
| 2 | 51 | 49 |
| 3 | 51 | 49 |
| 4 | 51 | 49 |
| 5 | 51 | 49 |
| 6 | 51 | 49 |
| 7 | 51 | 49 |
| 8 | 51 | 49 |
| 9 | 51 | 49 |
| 10 | 51 | 49 |
| 11 | 51 | 49 |
| 12 | 51 | 49 |
| 13 | 50 | 50 |
| 14 | 49 | 51 |
| 15 | 48 | 52 |
| 16 | 47 | 53 |
| 17 | 47 | 53 |
| 18 | 47 | 53 |
| 19 | 48 | 52 |
| 20 | 48 | 52 |
| 21 | 48 | 52 |
| 22 | 48 | 52 |
| 23 | 49 | 51 |
| 24 | 50 | 50 |
| 25 | 51 | 49 |
| 26 | 52 | 48 |
| 27 | 52 | 48 |
| 28 | 54 | 46 |
| 29 | 54 | 46 |
| 30 | 54 | 46 |
| 31 | 55 | 45 |
Chance of precipitation in March
Tracy gets around 2.6 in of rain over 8.9 wet days in March. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 28% and peaks near 32% on the wettest days. The odds ease toward the end of the month.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 32 | 31 | 31 | 30 | 30 | 29 | 29 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 27 | 27 | 26 | 26 | 25 | 24 | 24 | 23 |
| Rain chance (%) | |
|---|---|
| 1 | 32 |
| 2 | 31 |
| 3 | 31 |
| 4 | 30 |
| 5 | 30 |
| 6 | 29 |
| 7 | 29 |
| 8 | 28 |
| 9 | 28 |
| 10 | 27 |
| 11 | 27 |
| 12 | 27 |
| 13 | 27 |
| 14 | 27 |
| 15 | 27 |
| 16 | 27 |
| 17 | 28 |
| 18 | 28 |
| 19 | 28 |
| 20 | 29 |
| 21 | 28 |
| 22 | 28 |
| 23 | 28 |
| 24 | 27 |
| 25 | 27 |
| 26 | 26 |
| 27 | 26 |
| 28 | 25 |
| 29 | 24 |
| 30 | 24 |
| 31 | 23 |
Humidity in March
Most of March feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, March 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 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 |
| 31 | 100 |
Wind in March
Winds average 5 mph in March.
Across March, daily wind ranges from about 5 mph on the calmest days to 5 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| 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 | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 5 | calm |
| 2 | 5 | calm |
| 3 | 5 | calm |
| 4 | 5 | calm |
| 5 | 5 | calm |
| 6 | 5 | calm |
| 7 | 5 | calm |
| 8 | 5 | calm |
| 9 | 5 | calm |
| 10 | 5 | calm |
| 11 | 5 | calm |
| 12 | 5 | calm |
| 13 | 5 | calm |
| 14 | 5 | calm |
| 15 | 5 | calm |
| 16 | 5 | calm |
| 17 | 5 | calm |
| 18 | 5 | calm |
| 19 | 5 | calm |
| 20 | 5 | calm |
| 21 | 5 | calm |
| 22 | 5 | calm |
| 23 | 5 | calm |
| 24 | 5 | calm |
| 25 | 5 | calm |
| 26 | 5 | calm |
| 27 | 5 | calm |
| 28 | 5 | calm |
| 29 | 5 | calm |
| 30 | 5 | calm |
| 31 | 5 | calm |
Sunrise & sunset in March
Daylight runs from about 11 h 06 min at the start of March to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 72 minutes over March. Sunrise moves from 6:46 AM to 6:01 AM, and sunset from 5:52 PM to 6:20 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.1 | 11.1 | 11.2 | 11.2 | 11.2 | 11.3 | 11.3 | 11.4 | 11.4 | 11.5 | 11.5 | 11.5 | 11.6 | 11.6 | 11.7 | 11.7 | 11.7 | 11.8 | 11.8 | 11.9 | 11.9 | 11.9 | 12.0 | 12.0 | 12.1 | 12.1 | 12.2 | 12.2 | 12.2 | 12.3 | 12.3 |
| Sunrise (AM) | 6:46 | 6:45 | 6:44 | 6:42 | 6:41 | 6:39 | 6:38 | 6:36 | 6:35 | 6:33 | 6:32 | 6:30 | 6:29 | 6:27 | 6:26 | 6:24 | 6:23 | 6:21 | 6:20 | 6:18 | 6:17 | 6:15 | 6:14 | 6:12 | 6:10 | 6:09 | 6:07 | 6:06 | 6:04 | 6:03 | 6:01 |
| Sunset (PM) | 5:52 | 5:53 | 5:54 | 5:55 | 5:56 | 5:57 | 5:58 | 5:59 | 6:00 | 6:01 | 6:01 | 6:02 | 6:03 | 6:04 | 6:05 | 6:06 | 6:07 | 6:08 | 6:09 | 6:10 | 6:11 | 6:12 | 6:13 | 6:14 | 6:15 | 6:16 | 6:17 | 6:18 | 6:18 | 6:19 | 6:20 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.1 | 6:46 | 5:52 |
| 2 | 11.1 | 6:45 | 5:53 |
| 3 | 11.2 | 6:44 | 5:54 |
| 4 | 11.2 | 6:42 | 5:55 |
| 5 | 11.2 | 6:41 | 5:56 |
| 6 | 11.3 | 6:39 | 5:57 |
| 7 | 11.3 | 6:38 | 5:58 |
| 8 | 11.4 | 6:36 | 5:59 |
| 9 | 11.4 | 6:35 | 6:00 |
| 10 | 11.5 | 6:33 | 6:01 |
| 11 | 11.5 | 6:32 | 6:01 |
| 12 | 11.5 | 6:30 | 6:02 |
| 13 | 11.6 | 6:29 | 6:03 |
| 14 | 11.6 | 6:27 | 6:04 |
| 15 | 11.7 | 6:26 | 6:05 |
| 16 | 11.7 | 6:24 | 6:06 |
| 17 | 11.7 | 6:23 | 6:07 |
| 18 | 11.8 | 6:21 | 6:08 |
| 19 | 11.8 | 6:20 | 6:09 |
| 20 | 11.9 | 6:18 | 6:10 |
| 21 | 11.9 | 6:17 | 6:11 |
| 22 | 11.9 | 6:15 | 6:12 |
| 23 | 12.0 | 6:14 | 6:13 |
| 24 | 12.0 | 6:12 | 6:14 |
| 25 | 12.1 | 6:10 | 6:15 |
| 26 | 12.1 | 6:09 | 6:16 |
| 27 | 12.2 | 6:07 | 6:17 |
| 28 | 12.2 | 6:06 | 6:18 |
| 29 | 12.2 | 6:04 | 6:18 |
| 30 | 12.3 | 6:03 | 6:19 |
| 31 | 12.3 | 6:01 | 6:20 |
Solar energy in March
Average shortwave solar energy reaching the ground each day in March, about 4.78 kWh/m².
For context, solar energy here swings from a low near 2.26 kWh/m² to a high of 8.27 kWh/m² in July across the year — March's 4.78 kWh/m² falls in the middle.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.0 | 4.1 | 4.1 | 4.2 | 4.2 | 4.3 | 4.3 | 4.4 | 4.4 | 4.5 | 4.5 | 4.6 | 4.6 | 4.7 | 4.7 | 4.8 | 4.8 | 4.9 | 4.9 | 5.0 | 5.0 | 5.0 | 5.1 | 5.2 | 5.2 | 5.3 | 5.3 | 5.4 | 5.5 | 5.5 | 5.6 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.0 | Bright |
| 2 | 4.1 | Bright |
| 3 | 4.1 | Bright |
| 4 | 4.2 | Bright |
| 5 | 4.2 | Bright |
| 6 | 4.3 | Bright |
| 7 | 4.3 | Bright |
| 8 | 4.4 | Bright |
| 9 | 4.4 | Bright |
| 10 | 4.5 | Bright |
| 11 | 4.5 | Bright |
| 12 | 4.6 | Bright |
| 13 | 4.6 | Bright |
| 14 | 4.7 | Bright |
| 15 | 4.7 | Bright |
| 16 | 4.8 | Bright |
| 17 | 4.8 | Bright |
| 18 | 4.9 | Bright |
| 19 | 4.9 | Bright |
| 20 | 5.0 | Bright |
| 21 | 5.0 | Bright |
| 22 | 5.0 | Bright |
| 23 | 5.1 | Bright |
| 24 | 5.2 | Bright |
| 25 | 5.2 | Bright |
| 26 | 5.3 | Bright |
| 27 | 5.3 | Bright |
| 28 | 5.4 | Bright |
| 29 | 5.5 | Bright |
| 30 | 5.5 | Bright |
| 31 | 5.6 | Bright |
Is March a good time to visit Tracy?
Our two travel scores rate March for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
March is a reasonable time to visit Tracy for sightseeing.
What to pack for Tracy in March
From March's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In March, Tracy sees daytime highs around 65°F and nights near 46°F. Worth packing: a warm layer, rain gear and sun protection. About 9 days see rain.
UV index in Tracy in March
Clear-sky midday UV in March peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Tracy peaks around June 22 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 4 | 7 | 8 | 10 | 10 | 10 | 6 | 5 | 2 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme | Very high | High | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 4 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 10 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Very high |
| Sep | 6 | High |
| Oct | 5 | High |
| Nov | 2 | Moderate |
| Dec | 2 | Moderate |
Air quality in Tracy in March
Average fine-particle pollution (PM2.5) through the year — so you can see where March falls, not just the annual average.
Air quality in Tracy is worst in August — around 34 µg/m³ PM2.5 (moderate), about 4.9× the cleanest month (June, 7 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) | 13 | 13 | 13 | 10 | 8 | 7 | 9 | 34 | 16 | 14 | 15 | 12 |
| Level | Moderate | Moderate | Moderate | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 13 | Moderate |
| Mar | 13 | Moderate |
| Apr | 10 | Good |
| May | 8 | Good |
| Jun | 7 | Good |
| Jul | 9 | Good |
| Aug | 34 | Moderate |
| Sep | 16 | Moderate |
| Oct | 14 | Moderate |
| Nov | 15 | Moderate |
| Dec | 12 | Good |
Where is Tracy?
Tracy sits at 37.7°N, 121.4°W, 52 ft above sea level, in United States. The nearest listed city is Lathrop, 9.9 mi away.
Topography around Tracy
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Tracy.
Within 2 miles, the terrain around Tracy has only modest variations in elevation — a maximum elevation change of 118 ft around an average of 52 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,795 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,373 ft.
The land around Tracy is covered by artificial surfaces (64%) within 2 miles, grassland (41%) and cropland (31%) within 10 miles, and grassland (40%) and trees (24%) 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 Tracy (37.7399°, -121.4262°, elevation 52 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).