Climate Chart of Hartford, USA

Climate overview

Temperature

The coolest monthly mean temperature occurs in January, at -1.6 °C, while the warmest monthly mean is in July, at 23.9 °C. These are monthly averages, not daytime maximum temperatures, so they describe the broad temperature contrast between the two points in the year rather than the full range visitors may encounter on individual days. Across the calendar months, the unweighted mean of the monthly mean temperatures is 10.9 °C. It is a summary of monthly averages, not a day-weighted annual average, and it should not be read as a typical temperature for every month.

Rain

Mean daily rainfall is lowest in February, at 1.82 mm/day, and highest in September, at 4.07 mm/day. These averages can help frame expectations for wetter or lower-rainfall periods, but they do not indicate how often rain falls or guarantee dry weather on a particular day. The unweighted mean of the monthly mean daily rainfall amounts is 2.92 mm/day. This is a daily mean, not a monthly rainfall total, so it is best used as a broad reference rather than a measure of the amount expected over a whole month.

Snow

Mean daily snowfall reaches its highest monthly value in February, at 10.83 mm/day; the unweighted mean of the monthly mean daily snowfall amounts is 2.48 mm/day. These are average daily amounts, not monthly totals, and they do not establish the number of snowy days, snow depth, snow cover, or skiing conditions.

Sunshine

Mean daily sunshine reaches its highest monthly value in July, at 11.06 hours/day, and its lowest in December, at 5.08 hours/day. The figures help describe the monthly pattern of sunshine duration for planning outdoor time, but sunshine hours are not the same as day length and do not promise clear skies on a given day. The unweighted mean of the monthly mean daily sunshine durations is 8.08 hours/day. It summarizes monthly averages across the calendar, rather than indicating the sunshine visitors should expect on every date.