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Weather & Climate in San Acacio, CO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Acacio has a cool climate with an average annual temperature of 44°F (6°C). Winters average 20°F in January while summers reach 66°F in July. The area gets 330 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 9.8 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 7,721 feet.
Temperature
20°F Jan (-7°C)
66°F Jul (19°C)
| Annual Average | 43.5°F |
| 19% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 7,721 ft (2,353 m) |
| Area | 1.3 sq mi (3.3 km²) |
| Population Density | 18/sq mi |
| Coordinates | 37.2086°N, 105.5666°W |
| Timezone | America/Denver |
| County | Costilla County County |
| Nearest Airport | San Luis Valley Regional/Bergman Field (ALS) 23 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 6.6 / 100 |
| Social Vulnerability | 96.5 / 100 |
| Community Resilience | 0.6 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Relatively Moderate |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
| Volcano | No Rating |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
345 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.3.
| Aug 23, 2011 | 6 km S of Valdez, Colorado | M5.3 | 78 km | 4 km |
| Aug 10, 2005 | 20 km S of Weston, Colorado | M5.0 | 71 km | 5 km |
| Aug 22, 2011 | 9 km SSW of Starkville, Colorado | M4.7 | 92 km | 5 km |
| Sep 5, 2001 | 0 km SE of Cokedale, Colorado | M4.5 | 84 km | 5 km |
| Jan 3, 2007 | 8 km SSW of Weston, Colorado | M4.4 | 62 km | 5 km |
| Mar 22, 2004 | 30 km S of Weston, Colorado | M4.4 | 75 km | 5 km |
| Mar 10, 2023 | 6 km NNE of Segundo, Colorado | M4.3 | 74 km | 6 km |
| Aug 1, 2004 | 31 km S of Stonewall Gap, Colorado | M4.3 | 55 km | 5 km |
| Jul 29, 2009 | 32 km NNE of Cimarron, New Mexico | M4.1 | 80 km | 5 km |
| Aug 10, 2005 | 20 km SSW of Segundo, Colorado | M4.1 | 72 km | 5 km |
| Jun 19, 2023 | Colorado | M4.1 | 97 km | 6 km |
| Feb 6, 2016 | Colorado | M4.0 | 56 km | 2 km |
| Sep 4, 2001 | 2 km W of Cokedale, Colorado | M4.0 | 82 km | 5 km |
| Aug 26, 2023 | 19 km SSW of Weston, Colorado | M4.0 | 62 km | 4 km |
| Aug 23, 2011 | 7 km S of Valdez, Colorado | M4.0 | 79 km | 5 km |
| Sep 13, 2011 | 20 km S of Sequndo, Colorado | M4.0 | 79 km | 5 km |
| Sep 16, 2011 | 26 km S of Sequndo, Colorado | M3.9 | 82 km | 5 km |
| Aug 20, 2015 | 7 km WSW of Weston, Colorado | M3.9 | 59 km | 1 km |
| Aug 23, 2016 | 18 km SSW of Weston, CO | M3.9 | 60 km | 4 km |
| Mar 10, 2023 | 5 km N of Sequndo, Colorado | M3.9 | 74 km | 4 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
49 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 39 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 31, 1955 | EF3 | 27 km | 0.5 mi | 0 |
| Jul 25, 1996 | EF2 | 98 km | 2.0 mi | 0 |
| Jul 4, 1960 | EF2 | 92 km | 0.1 mi | 0 |
| Jul 10, 1955 | EF2 | 38 km | 0.1 mi | 0 |
| Jun 17, 1953 | EF2 | 49 km | 1.0 mi | 0 |
| May 8, 2017 | EF1 | 90 km | 0.2 mi | 0 |
| Aug 16, 2008 | EF1 | 49 km | 0.3 mi | 0 |
| Mar 19, 1995 | EF1 | 37 km | 0.1 mi | 0 |
| May 25, 1993 | EF1 | 56 km | 1.0 mi | 0 |
| Jun 22, 1983 | EF1 | 47 km | 1.5 mi | 0 |
| Jun 10, 1983 | EF1 | 94 km | 0.5 mi | 0 |
| Jun 10, 1983 | EF1 | 72 km | 0.5 mi | 0 |
| Jun 19, 1982 | EF1 | 55 km | 2.0 mi | 0 |
| May 5, 1980 | EF1 | 9 km | 2.0 mi | 0 |
| Jun 16, 1965 | EF1 | 96 km | 0.1 mi | 0 |
| Jun 25, 1956 | EF1 | 39 km | 0.1 mi | 0 |
| May 31, 2021 | EF0 | 38 km | 3.5 mi | 0 |
| Sep 1, 2018 | EF0 | 34 km | 0.3 mi | 0 |
| Aug 9, 2018 | EF0 | 79 km | 2.3 mi | 0 |
| May 22, 2014 | EF0 | 44 km | 0.3 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: SPRING CREEK (107,108 acres, 2018).
| Year | Name | Acres Burned | Distance |
| 2018 | SPRING CREEK | 107,108 | 53 km |
| 2002 | PONIL COMPLEX | 89,084 | 75 km |
| 2018 | UTE PARK | 30,177 | 89 km |
| 2002 | SPRING | 24,044 | 57 km |
| 2006 | MATO VEGA | 13,126 | 52 km |
| 2013 | EAST PEAK | 10,082 | 66 km |
| 1996 | HONDO | 8,258 | 63 km |
| 2017 | BONITA | 7,754 | 87 km |
| 2017 | HONDITO | 6,949 | 78 km |
| 2021 | HART CANYON RX FY22 | 5,781 | 67 km |
| 2018 | LOOP ROAD RX | 5,688 | 62 km |
| 2008 | WEST FORK | 5,436 | 75 km |
| 2003 | ENCEBADO | 5,064 | 88 km |
| 2010 | MEDANO | 4,887 | 68 km |
| 2023 | ALAMOSA RX UNIT 1 FY24 | 4,616 | 99 km |
| 1998 | BEARD | 4,553 | 74 km |
| 2010 | H12 | 4,393 | 46 km |
| 2006 | MAURICIO CANYON | 4,370 | 71 km |
| 2021 | RING RX FY21 | 4,172 | 64 km |
| 2023 | MCCRYSTAL ROCK RX (EAST) FY24 | 4,054 | 60 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 0.3 in | Coldest, Driest |
| February | 26°F (-3°C) | 0.4 in | |
| March | 34°F (1°C) | 0.6 in | |
| April | 42°F (5°C) | 0.6 in | |
| May | 51°F (11°C) | 1.0 in | |
| June | 61°F (16°C) | 0.9 in | |
| July | 66°F (19°C) | 1.7 in | Warmest |
| August | 64°F (18°C) | 2.0 in | Wettest |
| September | 57°F (14°C) | 1.2 in | |
| October | 46°F (8°C) | 0.9 in | |
| November | 32°F (0°C) | 0.7 in | |
| December | 21°F (-6°C) | 0.4 in |
San Acacio has a seasonal temperature swing of 45°F / from 20°F in January to 66°F in July. Total annual precipitation is 10.4 inches, with August being the wettest month (2.0") and January the driest (0.3").