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A cold, drizzly day is enough to dampen anyone's mood.
Now, scientists claim the impact of cold weather may be far worse than we realise.
Study - Media - Posts - Temperatures - Public
According to a study of 3.5 billion social media posts, sub-zero temperatures are found to be more depressing for the public than the anniversary of 9/11.
They also make people as gloomy as the 2015 mass shootings in San Bernardino, in which 14 people were killed.
Temperatures - Earthquake - San - Francisco - Bay
However, cold temperatures aren't seen as bad as the 2014 earthquake in the San Francisco bay or the catastrophic 2015 floods in South Carolina in 2015.
This is according to analysis of 2.4 billion Facebook posts and 1.1 billion tweets by Americans between the years 2009 and 2016.
Research - Dr - Patrick - Baylis - Vancouver
The research was conducted by Dr Patrick Baylis, of the Vancouver School of Economics in Canada, and Dr Nick Obradovich, from the Massachusetts Institute of Technology (MIT).
Dr Baylis and Dr Obradovich used software to analyse the language of billions of social media posts.
Number - Words - Emotion - 'love - 'nice
They looked for the number of words expressing either positive emotion (such as 'love' or 'nice') or negative feelings ('ugly' or 'nasty').
Each post received a score for both positivity and negativity.
Tweets - Conditions - Time - Records - Temperature
The tweets were then compared to weather conditions at that time through local records of temperature, precipitation, humidity, and cloud cover.
Dr Obradovich said: 'We conducted the largest ever investigation into the relationship between...
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