Heat is the defining danger at Blackwell School National Historic Site, with Texas statewide data recording 828 heat events alongside 336 additional excessive-heat incidents — part of a broader hazard picture that has caused 235 injuries across tracked weather episodes. Presidio County's remote West Texas location compounds this risk, where summer ground temperatures can surge well past air temperature readings and shade is scarce around the historic site's open grounds.
Before you visit, load a insulated, wide-mouth water bottle — plan at minimum one gallon of water per person per day and keep it in a cooler rather than a hot car trunk. Schedule any outdoor activity before 10 a.m. or after 5 p.m. to avoid peak radiative heat, and dress in loose, light-colored, moisture-wicking fabric. Flash flooding ranks fourth in the data with 539 recorded events, so check Presidio County road conditions before departure, as desert arroyos can fill without warning even under a clear sky above you.
Top recorded hazards in Texas
State dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Hail 1588
- Thunderstorm Wind 988
- Heat 828
- Flash Flood 539
- Drought 449
- Excessive Heat 336
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About Blackwell School National Historic Site
Written by prejudice rather than law, the story of the Blackwell School is one of “separate but equal” education for Mexican and Mexican American citizens of Marfa, Texas. Built in 1909, the school serves as a significant example of how racism and cultural disparity dominated education and social systems in the United States during this period of de facto segregation from 1889-1965.
Weather
Marfa experiences long and hot summers from May – September. The winters are cold and windy with occasional light snow due to its elevation from November – February. Spring and fall offer pleasant temperatures and light rainfall.