Climate
Estevan has a humid continental climate (Köppen climate classification Dfb), characterized by cold, long and dry winters and warm, short and relatively humid summers. The mean temperature in January, the coldest month, is −14.8 °C (5.4 °F). The precipitation in winter is chiefly snow, averaging 56.0 cm (22.05 in). The spring is a short transitional season, with a mean temperature of 4.4 °C (39.9 °F) and 107.3 mm (4.22 in) of precipitation, with significant snowfall in April. The summer is usually warm (the mean average high temperature is 25.3 °C (77.5 °F) (average high in July, the warmest month, is 26.5 °C (79.7 °F) and humid (190.8 mm (7.51 in) of total precipitation). Autumn, as spring, is transitional, being warm in September and cooler in October and November. At this time of the year, the average temperature is 4.6 °C (40.3 °F) and the total precipitation is 85.9 mm (3.38 in). The extreme low and high temperatures are, respectively, −42.2 °C (−44.0 °F), recorded on January 20, 1954, and 41.1 °C (106.0 °F), recorded on August 8, 1958. Estevan is the sunniest city year-round in Canada, and it is also the city with the clearest skies year round in Canada.
| Climate data for Estevan Regional Aerodrome | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Humidex | 11.2 | 16.8 | 22.8 | 31.6 | 37.6 | 43.5 | 52.0 | 44.1 | 38.9 | 33.3 | 21.5 | 12.8 | 52.0 |
| Record high °C (°F) | 11.4 (52.5) |
17.0 (62.6) |
25.6 (78.1) |
32.2 (90.0) |
38.7 (101.7) |
39.1 (102.4) |
40.5 (104.9) |
41.1 (106.0) |
37.8 (100.0) |
33.3 (91.9) |
22.1 (71.8) |
13.3 (55.9) |
41.1 (106.0) |
| Average high °C (°F) | −9.4 (15.1) |
−5.2 (22.6) |
1.4 (34.5) |
11.5 (52.7) |
18.9 (66.0) |
23.4 (74.1) |
26.5 (79.7) |
26.0 (78.8) |
19.3 (66.7) |
12.2 (54.0) |
0.7 (33.3) |
−6.5 (20.3) |
9.9 (49.8) |
| Daily mean °C (°F) | −14.8 (5.4) |
−10.4 (13.3) |
−3.8 (25.2) |
5.0 (41.0) |
12.1 (53.8) |
16.8 (62.2) |
19.5 (67.1) |
18.6 (65.5) |
12.4 (54.3) |
5.6 (42.1) |
−4.3 (24.3) |
−11.7 (10.9) |
3.7 (38.7) |
| Average low °C (°F) | −20.1 (−4.2) |
−15.5 (4.1) |
−9 (15.8) |
−1.6 (29.1) |
5.1 (41.2) |
10.2 (50.4) |
12.5 (54.5) |
11.3 (52.3) |
5.4 (41.7) |
−1 (30.2) |
−9.4 (15.1) |
−16.9 (1.6) |
−2.4 (27.7) |
| Record low °C (°F) | −42.2 (−44.0) |
−41.5 (−42.7) |
−36.7 (−34.1) |
−22.8 (−9.0) |
−10 (14.0) |
−2.8 (27.0) |
2.8 (37.0) |
−0.6 (30.9) |
−8.1 (17.4) |
−21.5 (−6.7) |
−32.8 (−27.0) |
−39.5 (−39.1) |
−42.2 (−44.0) |
| Wind chill | −55.5 | −60 | −50.5 | −35 | −17.7 | −7.7 | 0.7 | −4 | −12.9 | −31.2 | −43.8 | −55.4 | −60 |
| Precipitation mm (inches) | 17.1 (0.673) |
15.1 (0.594) |
23.0 (0.906) |
28.7 (1.13) |
55.6 (2.189) |
76.3 (3.004) |
65.0 (2.559) |
49.5 (1.949) |
43.9 (1.728) |
24.2 (0.953) |
17.8 (0.701) |
17.2 (0.677) |
433.3 (17.059) |
| Rainfall mm (inches) | 0.3 (0.012) |
1.2 (0.047) |
5.8 (0.228) |
17.2 (0.677) |
52.1 (2.051) |
76.2 (3) |
65.0 (2.559) |
49.5 (1.949) |
43.2 (1.701) |
18.6 (0.732) |
3.2 (0.126) |
0.8 (0.031) |
333.1 (13.114) |
| Snowfall cm (inches) | 20.5 (8.07) |
16.2 (6.38) |
18.3 (7.2) |
10.8 (4.25) |
2.8 (1.1) |
0.1 (0.04) |
0.0 (0) |
0.0 (0) |
0.7 (0.28) |
6.0 (2.36) |
16.7 (6.57) |
19.3 (7.6) |
111.2 (43.78) |
| Avg. precipitation days (≥ 0.2 mm) | 10.5 | 8.6 | 9.3 | 8.3 | 11.3 | 12.5 | 10.8 | 10.0 | 9.0 | 6.7 | 7.6 | 9.7 | 114.4 |
| Avg. rainy days (≥ 0.2 mm) | 0.5 | 0.8 | 2.8 | 5.8 | 11.0 | 12.5 | 10.8 | 10.0 | 8.7 | 5.3 | 1.6 | 1.0 | 70.9 |
| Avg. snowy days (≥ 0.2 cm) | 11.4 | 8.9 | 7.7 | 3.8 | 0.9 | 0.0 | 0.0 | 0.0 | 0.5 | 2.1 | 6.8 | 10.2 | 52.3 |
| Mean monthly sunshine hours | 114.9 | 134.7 | 176.5 | 225.4 | 265.4 | 289.4 | 335.1 | 296.6 | 208.8 | 177.3 | 111.6 | 99.2 | 2,434.8 |
| Source: | |||||||||||||
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