Climate
Moosonee has a subarctic climate (Köppen Dfc), generally featuring long cold winters and short warm summers, with James Bay acting as a thermal reservoir to moderate spring and fall temperatures. Freeze-up on the Moose River normally occurs between late November and mid-December, with mean daily minimum January temperatures approximately −27 °C (−17 °F). Spring break-up, or spring thaw, usually occurs in April. Mean annual precipitation is approximately 682 millimetres (26.9 in), and mean annual snowfall is approximately 213 centimetres (83.9 in). Maximum accumulations of snow occur in mid-May. Severe thunderstorms can occur from time to time.
| Climate data for Moosonee | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Humidex | 7.2 | 8.9 | 26.6 | 29.6 | 36.8 | 39.3 | 44.7 | 43.4 | 40.8 | 28.8 | 20.7 | 12.9 | 44.7 |
| Record high °C (°F) | 7.2 (45.0) |
12.4 (54.3) |
19.4 (66.9) |
29.0 (84.2) |
34.0 (93.2) |
35.0 (95.0) |
37.8 (100.0) |
35.0 (95.0) |
32.2 (90.0) |
26.7 (80.1) |
18.9 (66.0) |
13.2 (55.8) |
37.8 (100.0) |
| Average high °C (°F) | −14.2 (6.4) |
−11 (12.2) |
−4.2 (24.4) |
3.7 (38.7) |
12.7 (54.9) |
18.8 (65.8) |
22.2 (72.0) |
20.8 (69.4) |
14.6 (58.3) |
7.6 (45.7) |
−0.8 (30.6) |
−10.8 (12.6) |
5.0 (41.0) |
| Daily mean °C (°F) | −20.7 (−5.3) |
−18.4 (−1.1) |
−11.7 (10.9) |
−2.4 (27.7) |
6.2 (43.2) |
11.9 (53.4) |
15.4 (59.7) |
14.4 (57.9) |
9.4 (48.9) |
3.4 (38.1) |
−4.7 (23.5) |
−16.3 (2.7) |
−1.1 (30.0) |
| Average low °C (°F) | −27 (−16.6) |
−25.7 (−14.3) |
−19.1 (−2.4) |
−8.6 (16.5) |
−0.3 (31.5) |
5.0 (41.0) |
8.5 (47.3) |
7.9 (46.2) |
4.1 (39.4) |
−0.8 (30.6) |
−8.6 (16.5) |
−21.7 (−7.1) |
−7.2 (19.0) |
| Record low °C (°F) | −46.7 (−52.1) |
−46.1 (−51.0) |
−41.7 (−43.1) |
−31.7 (−25.1) |
−17.2 (1.0) |
−7 (19.4) |
−2.2 (28.0) |
−3.1 (26.4) |
−6.1 (21.0) |
−16.7 (1.9) |
−34.4 (−29.9) |
−44.4 (−47.9) |
−46.7 (−52.1) |
| Wind chill | −55.6 | −53 | −49.4 | −36.8 | −26.1 | −9.6 | −4 | −5.3 | −10 | −20.4 | −40.5 | −51.5 | −55.6 |
| Precipitation mm (inches) | 33.9 (1.335) |
22.7 (0.894) |
31.7 (1.248) |
39.0 (1.535) |
53.7 (2.114) |
71.1 (2.799) |
101.3 (3.988) |
75.8 (2.984) |
90.0 (3.543) |
73.3 (2.886) |
54.3 (2.138) |
34.7 (1.366) |
681.5 (26.831) |
| Rainfall mm (inches) | 0.7 (0.028) |
1.9 (0.075) |
7.0 (0.276) |
20.6 (0.811) |
46.0 (1.811) |
70.4 (2.772) |
101.3 (3.988) |
75.8 (2.984) |
88.7 (3.492) |
59.1 (2.327) |
20.2 (0.795) |
2.2 (0.087) |
493.9 (19.445) |
| Snowfall cm (inches) | 40.8 (16.06) |
25.4 (10) |
27.6 (10.87) |
19.2 (7.56) |
6.9 (2.72) |
0.7 (0.28) |
0 (0) |
0 (0) |
1.0 (0.39) |
14.9 (5.87) |
37.5 (14.76) |
39.0 (15.35) |
212.9 (83.82) |
| Avg. precipitation days (≥ 0.2 mm) | 14.9 | 11.0 | 10.7 | 10.0 | 12.1 | 13.7 | 16.7 | 14.7 | 17.7 | 15.7 | 15.7 | 15.2 | 168.0 |
| Avg. rainy days (≥ 0.2 mm) | 0.27 | 0.96 | 2.4 | 4.9 | 10.4 | 13.6 | 16.7 | 14.7 | 17.6 | 12.4 | 4.2 | 0.69 | 98.7 |
| Avg. snowy days (≥ 0.2 cm) | 15.1 | 10.7 | 10.0 | 7.0 | 2.8 | 0.22 | 0 | 0 | 0.41 | 5.2 | 13.5 | 15.2 | 80.2 |
| Mean monthly sunshine hours | 94.3 | 134.7 | 159.0 | 190.3 | 218.3 | 221.0 | 250.1 | 222.1 | 131.5 | 87.8 | 58.3 | 62.8 | 1,830.1 |
| Source: Environment Canada | |||||||||||||
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