Climate
Penticton has a semi-arid climate (Köppen BSk) with hot, dry, sunny summers and cold, cloudy winters. Precipitation averages slightly more than 330 mm (13") annually. Penticton has hot summers with daytime temperatures above 30°C commonplace, but humidity is low and summer nights are cool. Winters are brief with mean daily temperatures averaging just below freezing for about 8 weeks out of the year. The average daily maximum remains above zero the entire year. Penticton is sheltered from cold Arctic air in winter by the surrounding mountain ranges, making blizzards and freezing rainstorms very rare. However, winters are very cloudy, as low lying clouds get trapped in the valley during the winter. The frost-free season averages more than 140 days a year, nights tend to be cool throughout the year but without bitter cold nights in winter.
| Climate data for Penticton | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °C (°F) | 15.7 (60.3) |
16.6 (61.9) |
21.7 (71.1) |
29.6 (85.3) |
33.9 (93.0) |
37.7 (99.9) |
40.6 (105.1) |
38.9 (102.0) |
36.6 (97.9) |
28.9 (84.0) |
19.4 (66.9) |
14.4 (57.9) |
40.6 (105.1) |
| Average high °C (°F) | 0.9 (33.6) |
4.3 (39.7) |
10.1 (50.2) |
15.6 (60.1) |
20.5 (68.9) |
24.5 (76.1) |
28.1 (82.6) |
27.6 (81.7) |
21.9 (71.4) |
14.3 (57.7) |
6.3 (43.3) |
1.4 (34.5) |
14.6 (58.3) |
| Daily mean °C (°F) | −1.7 (28.9) |
0.7 (33.3) |
4.7 (40.5) |
9.0 (48.2) |
13.6 (56.5) |
17.4 (63.3) |
20.4 (68.7) |
20.1 (68.2) |
14.9 (58.8) |
8.7 (47.7) |
3.1 (37.6) |
−1.1 (30.0) |
9.2 (48.6) |
| Average low °C (°F) | −4.3 (24.3) |
−3 (26.6) |
−0.7 (30.7) |
2.7 (36.9) |
6.7 (44.1) |
10.3 (50.5) |
12.7 (54.9) |
12.5 (54.5) |
7.8 (46.0) |
3.0 (37.4) |
−0.2 (31.6) |
−3.7 (25.3) |
3.6 (38.5) |
| Record low °C (°F) | −26.7 (−16.1) |
−26.7 (−16.1) |
−17.8 (0.0) |
−7.2 (19.0) |
−5.6 (21.9) |
0.0 (32.0) |
2.2 (36.0) |
2.9 (37.2) |
−3 (26.6) |
−14.5 (5.9) |
−22.3 (−8.1) |
−27.2 (−17.0) |
−27.2 (−17.0) |
| Precipitation mm (inches) | 26.8 (1.055) |
22.5 (0.886) |
22.3 (0.878) |
26.6 (1.047) |
37.3 (1.469) |
38.9 (1.531) |
27.9 (1.098) |
30.7 (1.209) |
24.7 (0.972) |
19.7 (0.776) |
27.1 (1.067) |
28.4 (1.118) |
332.7 (13.098) |
| Mean monthly sunshine hours | 39.5 | 78.8 | 143.5 | 195.9 | 237.4 | 246.1 | 295.2 | 275.0 | 211.9 | 141.6 | 55.0 | 36.2 | 1,956.1 |
| Source: Environment Canada | |||||||||||||
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