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Weather & Climate in San Guillermo la Reforma, Mexico
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Guillermo la Reforma experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 50°F in January while summers reach 56°F in July / relatively mild seasonal variation. The area gets 347 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 32.4 inches. The city sits at an elevation of 8,396 feet.
Temperature
50°F Jan (10°C)
56°F Jul (13°C)
| Annual Average | 54.7°F |
| 1% above US avg | |
| January Average | 50°F (10°C) |
| July Average | 56°F (13°C) |
| Sunny Days | 347 days/yr |
Geography
| Elevation | 8,396 ft (2,559 m) |
| Area | 54.2 sq mi (140.3 km²) |
| Population Density | 15/sq mi |
| Coordinates | 20.1203°N, 98.6986°W |
| Timezone | America/Mexico_City |
Precipitation & Snow
Air Quality
Earthquake History
143 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.7.
| Feb 8, 2016 | 5 km WSW of Atecax, Mexico | M4.7 | 143 km | 10 km |
| Mar 21, 1998 | 8 km W of San Mateo Ozolco, Mexico | M4.1 | 113 km | 5 km |
| Mar 12, 2000 | 1 km SE of Teocalco, Mexico | M4.1 | 60 km | 5 km |
| Mar 4, 2000 | 3 km NE of Tulcingo, Mexico | M4.1 | 141 km | 0 km |
| Jun 25, 2011 | 6 km N of Landa de Matamoros, Mexico | M4.1 | 140 km | 3 km |
| Feb 4, 2003 | Puebla region, Mexico | M4.1 | 134 km | 1 km |
| May 6, 2013 | 12 km NW of San Pedro Benito Juárez, Mexico | M4.1 | 122 km | 1 km |
| Apr 21, 1998 | central Mexico | M4.1 | 120 km | 0 km |
| Jul 25, 2002 | 13 km SW of Agua Zarca, Mexico | M4.1 | 123 km | 5 km |
| Aug 7, 2005 | 2 km W of San Isidro, Mexico | M4.0 | 38 km | 5 km |
| Sep 22, 1998 | 3 km WNW of Xalitzintla, Mexico | M4.0 | 116 km | 1 km |
| Nov 3, 2002 | 8 km SW of José María Morelos, Mexico | M4.0 | 118 km | 5 km |
| May 30, 2007 | 4 km SSW of Lomas de Tepemecatl, Mexico | M4.0 | 118 km | 15 km |
| Apr 17, 2010 | 5 km SSE of Pozuelos, Mexico | M4.0 | 51 km | 2 km |
| Sep 23, 2013 | 2 km ENE of Chilcuautla, Mexico | M4.0 | 58 km | 5 km |
| Sep 21, 1998 | 1 km W of San Mateo Ozolco, Mexico | M4.0 | 115 km | 1 km |
| Apr 27, 1998 | 4 km SW of San Nicolás de los Ranchos, Mexico | M4.0 | 121 km | 1 km |
| Feb 11, 1998 | 0 km WNW of La Magdalena Yancuitlalpan, Mexico | M3.9 | 135 km | 0 km |
| May 20, 2010 | 3 km N of La Estancia, Mexico | M3.9 | 33 km | 5 km |
| Aug 13, 1998 | 5 km NW of San Pedro Benito Juárez, Mexico | M3.9 | 128 km | 3 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
11 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2021 | Grace | Category 3 | 121 mph | 112 km |
| 2017 | Katia | Category 2 | 104 mph | 175 km |
| 2017 | Franklin | Category 1 | 81 mph | 220 km |
| 2010 | Karl | Category 3 | 127 mph | 241 km |
| 2007 | Dean | Category 2 | 98 mph | 152 km |
| 2007 | Lorenzo | Category 1 | 81 mph | 172 km |
| 2000 | Keith | Category 1 | 92 mph | 257 km |
| 1996 | Dolly | Category 1 | 81 mph | 195 km |
| 1993 | Gert | Category 2 | 98 mph | 117 km |
| 1990 | Diana | Category 2 | 98 mph | 161 km |
| 1988 | Debby | Category 1 | 75 mph | 159 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Nearby Volcanoes
12 volcanoes within 200 km. Closest: Papayo (90 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Papayo | Lava dome | 3,600 m (11,811 ft) | Unknown | 90 km |
| Iztaccihuatl | Stratovolcano | 5,230 m (17,159 ft) | Unknown | 105 km |
| Popocatepetl | Stratovolcano(es) | 5,393 m (17,694 ft) | 2020 | 122 km |
| Chichinautzin | Volcanic field | 3,930 m (12,894 ft) | 400 | 124 km |
| Humeros, Los | Caldera(s) | 3,150 m (10,335 ft) | -4470 | 139 km |
| Toluca, Nevado de | Stratovolcano | 4,680 m (15,354 ft) | -1350 | 158 km |
| Serdan-Oriental | Tuff cone(s) | 3,485 m (11,434 ft) | Unknown | 160 km |
| Gloria, La | Volcanic field | 3,500 m (11,483 ft) | Unknown | 175 km |
| Cofre de Perote | Shield(s) | 4,282 m (14,049 ft) | 1150 | 176 km |
| Zitacuaro-Valle de Bravo | Caldera | 3,500 m (11,483 ft) | -3050 | 181 km |
| Cumbres, Las | Stratovolcano | 3,940 m (12,927 ft) | -3920 | 185 km |
| Orizaba, Pico de | Stratovolcano | 5,564 m (18,255 ft) | 1846 | 193 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 50°F (10°C) | 0.5 in | Coldest |
| February | 55°F (13°C) | 0.4 in | |
| March | 59°F (15°C) | 0.6 in | |
| April | 61°F (16°C) | 1.2 in | |
| May | 63°F (17°C) | 2.2 in | Warmest |
| June | 62°F (16°C) | 3.4 in | |
| July | 56°F (13°C) | 3.6 in | Wettest |
| August | 60°F (16°C) | 2.8 in | |
| September | 60°F (16°C) | 3.2 in | |
| October | 58°F (14°C) | 1.7 in | |
| November | 56°F (13°C) | 0.6 in | |
| December | 54°F (12°C) | 0.3 in | Driest |
San Guillermo la Reforma has a seasonal temperature swing of 12°F / from 50°F in January to 63°F in May. Total annual precipitation is 20.6 inches, with July being the wettest month (3.6") and December the driest (0.3").