Gilroy weather in December
In December, Gilroy sees average daytime highs of 58°F and overnight lows near 40°F, with 3.0 in of rain across 7.7 wet days and about 9.5 hours of daylight. It is the 12th-warmest and 3rd-wettest month of the year here.
Day-to-day highs hold fairly steady near 58°F through the month. The sky is clear or mostly clear about 39% of the time in December, and the air most often feels dry.
Daylight stretches from about 9 h 36 min at the start of December to 9 h 30 min by month's end. Set against the rest of the year, December is Gilroy's 9th-clearest and 8th-windiest month. For the whole year in context, see Gilroy's year-round climate.
- Daytime high
- 58°
- 12th warmest
- Overnight low
- 40°
- 1st coldest
- Rainfall
- 3.0 in
- 7.7 wet days
- Daylight
- 9 h 30 min
- 7:18 AM – 4:47 PM
- Cloud cover
- 53%
- 9th clearest
- Wind
- 3 mph
- 8th windiest
- Solar energy
- 2.4 kWh/m²
- Travel score
- 4.6
- out of 10
Gilroy is city in Santa Clara County, California, United States.
- Density
- 1,272/km²
- people per km²
- Founded
- 1870
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in December
Day-to-day highs hold fairly steady near 58°F through the month.
A typical December day in Gilroy reaches about 58°F in the afternoon and slips back to 40°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 52°F and 64°F. Set against its neighbours, December runs about 6°F cooler than November and on par with January.
| 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) | 60 | 60 | 60 | 59 | 59 | 59 | 59 | 59 | 58 | 58 | 58 | 58 | 58 | 58 | 58 | 58 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 |
| Avg low (°F) | 42 | 42 | 42 | 42 | 41 | 41 | 41 | 41 | 41 | 41 | 41 | 41 | 41 | 41 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 60 | 42 |
| 2 | 60 | 42 |
| 3 | 60 | 42 |
| 4 | 59 | 42 |
| 5 | 59 | 41 |
| 6 | 59 | 41 |
| 7 | 59 | 41 |
| 8 | 59 | 41 |
| 9 | 58 | 41 |
| 10 | 58 | 41 |
| 11 | 58 | 41 |
| 12 | 58 | 41 |
| 13 | 58 | 41 |
| 14 | 58 | 41 |
| 15 | 58 | 40 |
| 16 | 58 | 40 |
| 17 | 57 | 40 |
| 18 | 57 | 40 |
| 19 | 57 | 40 |
| 20 | 57 | 40 |
| 21 | 57 | 40 |
| 22 | 57 | 40 |
| 23 | 57 | 40 |
| 24 | 57 | 40 |
| 25 | 57 | 40 |
| 26 | 57 | 40 |
| 27 | 57 | 40 |
| 28 | 57 | 40 |
| 29 | 57 | 40 |
| 30 | 57 | 40 |
| 31 | 57 | 40 |
Gilroy weather by month
How December compares with the rest of the year at a glance. December is the 12th-warmest and 3rd-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 58° / 41° | 3.4 | 8.3 | 9.7 | 4.6 |
| Feb | 60° / 43° | 3.4 | 8.5 | 10.6 | 5.0 |
| Mar | 63° / 45° | 2.5 | 8 | 11.7 | 6.0 |
| Apr | 66° / 47° | 1.1 | 4.6 | 12.9 | 7.1 |
| May | 70° / 50° | 0.5 | 2.8 | 14 | 8.1 |
| Jun | 75° / 53° | 0.1 | 0.6 | 14.5 | 9.2 |
| Jul | 79° / 57° | 0.0 | 0.2 | 14.3 | 9.2 |
| Aug | 79° / 57° | 0.0 | 0.1 | 13.4 | 9.2 |
| Sep | 78° / 56° | 0.1 | 0.4 | 12.3 | 9.2 |
| Oct | 73° / 51° | 0.7 | 1.9 | 11 | 8.7 |
| Nov | 64° / 45° | 1.4 | 4.7 | 10 | 6.7 |
| Dec | 58° / 40° | 3.0 | 7.7 | 9.5 | 4.6 |
Cloud cover in December
The sky is clear or mostly clear about 39% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 47%.
| 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 (%) | 57 | 56 | 56 | 55 | 54 | 54 | 53 | 53 | 52 | 53 | 53 | 53 | 53 | 53 | 53 | 52 | 52 | 53 | 53 | 53 | 53 | 52 | 52 | 52 | 52 | 51 | 51 | 51 | 49 | 49 | 48 |
| Cloudier (%) | 43 | 44 | 44 | 45 | 46 | 46 | 47 | 47 | 48 | 47 | 47 | 47 | 47 | 47 | 47 | 48 | 48 | 47 | 47 | 47 | 47 | 48 | 48 | 48 | 48 | 49 | 49 | 49 | 51 | 51 | 52 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 57 | 43 |
| 2 | 56 | 44 |
| 3 | 56 | 44 |
| 4 | 55 | 45 |
| 5 | 54 | 46 |
| 6 | 54 | 46 |
| 7 | 53 | 47 |
| 8 | 53 | 47 |
| 9 | 52 | 48 |
| 10 | 53 | 47 |
| 11 | 53 | 47 |
| 12 | 53 | 47 |
| 13 | 53 | 47 |
| 14 | 53 | 47 |
| 15 | 53 | 47 |
| 16 | 52 | 48 |
| 17 | 52 | 48 |
| 18 | 53 | 47 |
| 19 | 53 | 47 |
| 20 | 53 | 47 |
| 21 | 53 | 47 |
| 22 | 52 | 48 |
| 23 | 52 | 48 |
| 24 | 52 | 48 |
| 25 | 52 | 48 |
| 26 | 51 | 49 |
| 27 | 51 | 49 |
| 28 | 51 | 49 |
| 29 | 49 | 51 |
| 30 | 49 | 51 |
| 31 | 48 | 52 |
Chance of precipitation in December
Gilroy gets around 3.0 in of rain over 7.7 wet days in December. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 25% and peaks near 26% on the wettest days.
| 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 (%) | 23 | 23 | 24 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 |
| Rain chance (%) | |
|---|---|
| 1 | 23 |
| 2 | 23 |
| 3 | 24 |
| 4 | 25 |
| 5 | 25 |
| 6 | 25 |
| 7 | 25 |
| 8 | 25 |
| 9 | 25 |
| 10 | 26 |
| 11 | 25 |
| 12 | 25 |
| 13 | 25 |
| 14 | 25 |
| 15 | 25 |
| 16 | 24 |
| 17 | 24 |
| 18 | 24 |
| 19 | 24 |
| 20 | 24 |
| 21 | 24 |
| 22 | 24 |
| 23 | 24 |
| 24 | 25 |
| 25 | 25 |
| 26 | 25 |
| 27 | 25 |
| 28 | 26 |
| 29 | 26 |
| 30 | 26 |
| 31 | 26 |
Humidity in December
Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the dry band about 99% 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 (%) | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 |
| Comfortable (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | |
|---|---|---|
| 1 | 99 | 1 |
| 2 | 99 | 1 |
| 3 | 99 | 1 |
| 4 | 99 | 1 |
| 5 | 99 | 1 |
| 6 | 99 | 1 |
| 7 | 99 | 1 |
| 8 | 99 | 1 |
| 9 | 99 | 1 |
| 10 | 99 | 1 |
| 11 | 99 | 1 |
| 12 | 99 | 1 |
| 13 | 99 | 1 |
| 14 | 99 | 1 |
| 15 | 99 | 1 |
| 16 | 99 | 1 |
| 17 | 99 | 1 |
| 18 | 99 | 1 |
| 19 | 99 | 1 |
| 20 | 99 | 1 |
| 21 | 99 | 1 |
| 22 | 99 | 1 |
| 23 | 99 | 1 |
| 24 | 99 | 1 |
| 25 | 99 | 1 |
| 26 | 99 | 1 |
| 27 | 99 | 1 |
| 28 | 99 | 1 |
| 29 | 99 | 1 |
| 30 | 99 | 1 |
| 31 | 99 | 1 |
Wind in December
Winds average 3 mph in December.
Across December, daily wind ranges from about 3 mph on the calmest days to 4 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) | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| 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 | 3 | calm |
| 2 | 3 | calm |
| 3 | 3 | calm |
| 4 | 3 | calm |
| 5 | 3 | calm |
| 6 | 3 | calm |
| 7 | 3 | calm |
| 8 | 3 | calm |
| 9 | 3 | calm |
| 10 | 3 | calm |
| 11 | 3 | calm |
| 12 | 3 | calm |
| 13 | 3 | calm |
| 14 | 3 | calm |
| 15 | 3 | calm |
| 16 | 3 | calm |
| 17 | 3 | calm |
| 18 | 3 | calm |
| 19 | 3 | calm |
| 20 | 3 | calm |
| 21 | 3 | calm |
| 22 | 3 | calm |
| 23 | 4 | calm |
| 24 | 4 | calm |
| 25 | 4 | calm |
| 26 | 4 | calm |
| 27 | 4 | calm |
| 28 | 4 | calm |
| 29 | 4 | calm |
| 30 | 4 | calm |
| 31 | 4 | calm |
Sunrise & sunset in December
Daylight runs from about 9 h 36 min at the start of December to 9 h 30 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 6 minutes over December. Sunrise moves from 7:07 AM to 7:25 AM, and sunset from 4:45 PM to 4:54 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) | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 |
| Sunrise (AM) | 7:07 | 7:08 | 7:08 | 7:09 | 7:10 | 7:11 | 7:12 | 7:13 | 7:13 | 7:14 | 7:15 | 7:16 | 7:16 | 7:17 | 7:18 | 7:18 | 7:19 | 7:19 | 7:20 | 7:21 | 7:21 | 7:22 | 7:22 | 7:22 | 7:23 | 7:23 | 7:24 | 7:24 | 7:24 | 7:24 | 7:25 |
| Sunset (PM) | 4:45 | 4:45 | 4:45 | 4:45 | 4:45 | 4:45 | 4:45 | 4:45 | 4:45 | 4:45 | 4:45 | 4:46 | 4:46 | 4:46 | 4:46 | 4:47 | 4:47 | 4:47 | 4:48 | 4:48 | 4:48 | 4:49 | 4:49 | 4:50 | 4:50 | 4:51 | 4:52 | 4:52 | 4:53 | 4:54 | 4:54 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 9.6 | 7:07 | 4:45 |
| 2 | 9.6 | 7:08 | 4:45 |
| 3 | 9.6 | 7:08 | 4:45 |
| 4 | 9.6 | 7:09 | 4:45 |
| 5 | 9.6 | 7:10 | 4:45 |
| 6 | 9.6 | 7:11 | 4:45 |
| 7 | 9.6 | 7:12 | 4:45 |
| 8 | 9.5 | 7:13 | 4:45 |
| 9 | 9.5 | 7:13 | 4:45 |
| 10 | 9.5 | 7:14 | 4:45 |
| 11 | 9.5 | 7:15 | 4:45 |
| 12 | 9.5 | 7:16 | 4:46 |
| 13 | 9.5 | 7:16 | 4:46 |
| 14 | 9.5 | 7:17 | 4:46 |
| 15 | 9.5 | 7:18 | 4:46 |
| 16 | 9.5 | 7:18 | 4:47 |
| 17 | 9.5 | 7:19 | 4:47 |
| 18 | 9.5 | 7:19 | 4:47 |
| 19 | 9.5 | 7:20 | 4:48 |
| 20 | 9.5 | 7:21 | 4:48 |
| 21 | 9.5 | 7:21 | 4:48 |
| 22 | 9.5 | 7:22 | 4:49 |
| 23 | 9.5 | 7:22 | 4:49 |
| 24 | 9.5 | 7:22 | 4:50 |
| 25 | 9.5 | 7:23 | 4:50 |
| 26 | 9.5 | 7:23 | 4:51 |
| 27 | 9.5 | 7:24 | 4:52 |
| 28 | 9.5 | 7:24 | 4:52 |
| 29 | 9.5 | 7:24 | 4:53 |
| 30 | 9.5 | 7:24 | 4:54 |
| 31 | 9.5 | 7:25 | 4:54 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 2.4 kWh/m² — the year's lowest.
For context, solar energy here swings from a low near 2.4 kWh/m² to a high of 7.96 kWh/m² in June across the year — December's 2.4 kWh/m² sits near the bottom.
| 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) | 2.5 | 2.5 | 2.5 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.5 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 2.5 | Moderate |
| 2 | 2.5 | Moderate |
| 3 | 2.5 | Moderate |
| 4 | 2.4 | Moderate |
| 5 | 2.4 | Moderate |
| 6 | 2.4 | Moderate |
| 7 | 2.4 | Moderate |
| 8 | 2.4 | Moderate |
| 9 | 2.4 | Moderate |
| 10 | 2.4 | Moderate |
| 11 | 2.4 | Moderate |
| 12 | 2.3 | Moderate |
| 13 | 2.3 | Moderate |
| 14 | 2.3 | Moderate |
| 15 | 2.3 | Moderate |
| 16 | 2.3 | Moderate |
| 17 | 2.3 | Moderate |
| 18 | 2.3 | Moderate |
| 19 | 2.4 | Moderate |
| 20 | 2.4 | Moderate |
| 21 | 2.4 | Moderate |
| 22 | 2.4 | Moderate |
| 23 | 2.4 | Moderate |
| 24 | 2.4 | Moderate |
| 25 | 2.4 | Moderate |
| 26 | 2.4 | Moderate |
| 27 | 2.4 | Moderate |
| 28 | 2.4 | Moderate |
| 29 | 2.4 | Moderate |
| 30 | 2.4 | Moderate |
| 31 | 2.5 | Moderate |
Is December a good time to visit Gilroy?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is a reasonable time to visit Gilroy for sightseeing.
What to pack for Gilroy in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Gilroy sees daytime highs around 58°F and nights near 40°F. Worth packing: a warm layer. About 8 days see rain.
Sea temperature near Gilroy in December
The nearest coast averages about 55°F in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 19 mi away) is warmest in September at about 58°F and coldest in April near 54°F.
The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 55 | 55 | 55 | 54 | 54 | 55 | 57 | 58 | 58 | 58 | 56 | 55 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 55 | Bracing |
| Feb | 55 | Bracing |
| Mar | 55 | Bracing |
| Apr | 54 | Bracing |
| May | 54 | Bracing |
| Jun | 55 | Bracing |
| Jul | 57 | Bracing |
| Aug | 58 | Bracing |
| Sep | 58 | Bracing |
| Oct | 58 | Bracing |
| Nov | 56 | Bracing |
| Dec | 55 | Bracing |
UV index in Gilroy in December
Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Gilroy peaks around June 22 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 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) | 3 | 4 | 4 | 7 | 8 | 11 | 10 | 10 | 7 | 5 | 2 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme | Very high | High | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 4 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Very high |
| Sep | 7 | High |
| Oct | 5 | High |
| Nov | 2 | Moderate |
| Dec | 2 | Moderate |
Air quality in Gilroy in December
Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.
Air quality in Gilroy is worst in August — around 22 µg/m³ PM2.5 (moderate), about 4.2× the cleanest month (June, 5 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) | 7 | 8 | 8 | 7 | 6 | 5 | 8 | 22 | 15 | 12 | 8 | 7 |
| Level | Good | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 7 | Good |
| Feb | 8 | Good |
| Mar | 8 | Good |
| Apr | 7 | Good |
| May | 6 | Good |
| Jun | 5 | Good |
| Jul | 8 | Good |
| Aug | 22 | Moderate |
| Sep | 15 | Moderate |
| Oct | 12 | Moderate |
| Nov | 8 | Good |
| Dec | 7 | Good |
Where is Gilroy?
Gilroy sits at 37.0°N, 121.6°W, 200 ft above sea level, in United States. The nearest listed city is Morgan Hill, 9.9 mi away.
Topography around Gilroy
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Gilroy.
Within 2 miles, the terrain around Gilroy has only modest variations in elevation — a maximum elevation change of 640 ft around an average of 217 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,871 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,161 ft.
The land around Gilroy is covered by artificial surfaces (49%) and cropland (25%) within 2 miles, trees (38%) and grassland (36%) within 10 miles, and grassland (39%) and trees (27%) 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 Gilroy (37.0058°, -121.5683°, elevation 200 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).