friggin freezing - not great for brass monkeys, but evaporation continues all year round. The average in the peak summer months (October through Feb) is perhaps just double the average through the winter months (5.85mm/day vs 3.65mm/day)
Take a look at Table 7.4 (p28), Table 8.1 (p138) from
ORE's NI43-101
Or, for some independent data, take a look at Fig 5.9 and table 5.4 from
LAC's NI43-101
Still quietly rebalancing towards a great run in to Xmas...