Climate Change Chart of Whistler Blackcomb, Canada

Overview of climate changes

Changes in snowfall

Mean daily snowfall increased by a difference of +7.70 mm/day averaged across calendar months, based on an unweighted comparison of monthly means rather than a day-weighted annual average or monthly totals. The largest monthly increase was in January, where the difference was +29.91 mm/day. This monthly peak is not evidence that snowfall rose by the same amount in other months; it describes the most pronounced monthly increase among the supplied facts.

Temperature changes

Monthly mean temperatures show an overall difference of +2.24 °C averaged across calendar months; this is an unweighted mean of monthly means, not a day-weighted annual average or a measure of daytime highs. The largest monthly increase occurred in January, with a difference of +6.20 °C compared with the earlier reference period. That marks the strongest increase among the supplied monthly temperature changes, rather than describing every month.

Changes in rainfall

Mean daily rainfall increased by a difference of +0.31 mm/day averaged across calendar months, an unweighted summary of monthly means rather than an annual total or a day-weighted average. The largest monthly increase was in September, at a difference of +1.07 mm/day. In contrast, October had the largest monthly decrease, a difference of -0.21 mm/day. These monthly contrasts show why the overall mean should not be read as a uniform change in rainfall through the year; the figures describe daily amounts, not monthly totals.

Changes in sunshine duration

Mean daily sunshine duration had a difference of -0.16 hours/day averaged across calendar months, indicating a lower unweighted mean of the monthly values in the more recent period; it is not a day-weighted annual measure. The largest monthly increase was in July, with a difference of +0.95 hours/day, while the largest decrease occurred in March, at a difference of -0.72 hours/day. These extrema describe the strongest supplied monthly shifts in opposite directions, not a consistent change in sunshine in every month.