Weather, Pressure & Precipitation

Seasonal Affective Disorder

Reduced sunlight in winter months disrupts serotonin production and circadian rhythms. Seasonal Affective Disorder (SAD) affects 1–3% of the population in northern latitudes, with subsyndromal SAD affecting up to 20%. The mechanism is well understood: reduced light exposure suppresses serotonin transporter activity and disrupts melatonin timing.

Even in people without clinical SAD, reduced sunlight correlates with lower mood, reduced energy, and increased carbohydrate cravings — effects that reverse with light therapy or increased outdoor exposure.

Atmospheric Pressure

Drops in barometric pressure — which precede storms and weather fronts — correlate with increased joint pain, headaches, and mood dips. A 2022 systematic review in Pain Medicine found that chronic pain patients are particularly sensitive to pressure changes, with pain intensity increasing as pressure falls.

The proposed mechanism involves changes in tissue fluid pressure and gas expansion in body cavities, which can stimulate pain receptors. The effect is most pronounced in people with arthritis, fibromyalgia, and migraine.

Temperature & Cognitive Performance

Extreme heat correlates with reduced cognitive performance, increased aggression, and higher rates of impulsive behavior. Research published in Environmental Health Perspectives found significant non-linear relationships between temperature and human productivity and decision-making.

Cold and grey weather correlates with reduced serotonin transporter activity — the same pathway implicated in depression. Sunlight directly stimulates serotonin synthesis, which is why mood tends to improve on bright days regardless of temperature.

Key References