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The Cold weather health watch comprises five levels of response based on cold weather thresholds. The thresholds have been developed to trigger an alert when severe cold weather is likely to significantly affect people's health. The alerts take account of temperature along with other winter weather threats such as ice and snow.
A Cold weather health watch system operates in England from the 1 November to 31 March every year, in association with Public Health England. However, should thresholds for an alert be reached outside of this period, an extraordinary heat-health alert will be issued and stakeholders are advised to take the usual public health actions.