Today's barometric pressure in Fresno, a 48-hour pressure chart, and a migraine risk score based on pressure drops, humidity, and temperature changes.
Fresno's Central Valley location creates a unique weather environment where tule fog in winter brings sustained high-pressure inversions. The valley's agricultural dust and extreme summer heat add environmental triggers beyond barometric pressure alone.
Worst season for migraines: November through March. Winter Pacific storms deliver most of Fresno's annual precipitation and pressure variability. The Central Valley's geography traps cold, dense fog called Tule fog from November through February, creating weeks of stagnant, poor-visibility conditions with associated pressure inversions.
Common triggers in Fresno: Tule fog temperature inversions trapping pollutants, winter Pacific storm frontal passages, agricultural dust and particulate air pollution. Fresno sits in the heart of the San Joaquin Valley, a 250-mile trough between the Sierra Nevada and the Coast Ranges. This valley traps air pollution from agriculture and vehicle emissions under persistent winter inversions, creating some of the worst air quality in the nation. The Tule fog that blankets the valley for weeks at a time represents a sustained low-visibility, stagnant-air environment that compounds migraine triggers.
Typical pressure: Fresno averages 1004 hPa at rest, measured at the city's own elevation rather than corrected to sea level, and storm systems can push readings down to 995 hPa. Swings of 8-14 hPa over 24 hours are common during active weather and fall within the range most associated with pressure-triggered migraines.
Can Fresno weather trigger migraines?
Yes. Fresno experiences 8-14 hPa barometric pressure swings, and research shows pressure drops are one of the most common migraine triggers. The city's specific patterns include Tule fog temperature inversions trapping pollutants, winter Pacific storm frontal passages, agricultural dust and particulate air pollution.
What time of year are migraines worst in Fresno?
In Fresno the most barometrically volatile stretch of the year falls in November through March. That is when weather is most likely to play a part, if weather is a trigger for you at all.
How do I track migraine triggers in Fresno?
Use MigrAid to log your attacks with one tap. The app automatically records barometric pressure, temperature, and humidity at the time of each migraine, then finds patterns between your attacks and Fresno's weather conditions over time.
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Is it really the weather?
Weather gets blamed for a lot of migraines, but it's hard to know if it's really behind yours. The MigrAid app saves the barometric pressure with every migraine you log, so after a few weeks you can see whether Fresno's swings actually line up with your attacks, and get a heads-up on days that match your pattern.