Climate Change Chart of San Miguel de Allende, Mexico

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.34 °C compared with the earlier reference period; this is an unweighted mean of monthly means, not a day-weighted annual average or a measure of daytime maximum temperatures. The largest monthly increase was in April, with a difference of +2.02 °C. That identifies the strongest increase among the supplied monthly changes, rather than implying that every month changed by the same amount.

Changes in rainfall

Mean daily rainfall averaged across calendar months shows a difference of +0.29 mm/day compared with the earlier reference period. This is an unweighted average of monthly means, not a day-weighted annual average or a monthly rainfall total, and it does not describe every month individually. The largest monthly increase was in September, with a difference of +1.13 mm/day; in January, the largest monthly decrease was a difference of -0.61 mm/day. These two monthly contrasts show that the overall average does not capture the direction of change in every month.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, shows a difference of -0.11 hours/day compared with the earlier reference period. This unweighted average of monthly means summarizes the comparison, rather than indicating the change in every month. The largest monthly increase occurred in January, at a difference of +0.39 hours/day, while the largest decrease was in June, at a difference of -0.32 hours/day. These changes refer to mean daily hours, not total sunshine accumulated over a month.

Changes in snowfall

The unweighted mean of monthly mean daily snowfall shows a difference of 0.00 mm/day at the displayed precision; an unchanged rounded average does not establish that values were identical beyond that precision or in every month. The monthly differences include an increase in March of +0.06 mm/day and a decrease in January of -0.07 mm/day. These are changes in mean daily snowfall, not monthly totals, and the month-specific differences need not be reflected in the rounded average across calendar months.