"Howard and Hoffman (1984) had 24 college students keep track of their mood (by filling out a mood questionnaire) over 11 consecutive days. They found a significant effect on mood correlated with the weather, especially with regards to humidity (a component of weather not always measured):
Humidity, temperature, and hours of sunshine had the greatest effect on mood. High levels of humidity lowered scores on concentration while increasing reports of sleepiness. Rising temperatures lowered anxiety and skepticism mood scores. [...]
The number of hours of sunshine was found to predict optimism scores significantly. As the number of hours of sunshine increased, optimism scores also increased. [...]
Mood scores on the depression and anxiety scales were not predicted by any weather variable.
Another study by Sanders and Brizzolara (1982) on 30 college students also found similar findings — that high humidity was a predictor for lack of vigor, elation, and affection." IN PSYCHCENTRAL
Humidity, temperature, and hours of sunshine had the greatest effect on mood. High levels of humidity lowered scores on concentration while increasing reports of sleepiness. Rising temperatures lowered anxiety and skepticism mood scores. [...]
The number of hours of sunshine was found to predict optimism scores significantly. As the number of hours of sunshine increased, optimism scores also increased. [...]
Mood scores on the depression and anxiety scales were not predicted by any weather variable.
Another study by Sanders and Brizzolara (1982) on 30 college students also found similar findings — that high humidity was a predictor for lack of vigor, elation, and affection." IN PSYCHCENTRAL
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