Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
84.4
88
87
83
85
80
February
85.5
90
83
89
88
79
March
87.9
82
88
94
94
91
April
91.7
89
99
90
92
85
May
95.7
94
99
94
91
99
June
95.6
97
97
92
98
93
July
97.7
94
97
99
99
99
August
91.0
90
94
90
88
92
September
90.6
97
99
85
92
October
79.7
87
85
86
73
November
69.7
60
58
76
77
December
79.3
76
76
81
84
Average
89.9
91.1
91.7
90.1
90.2
89.1
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-15.0
-17
-12
-12
-22
-10
February
-13.8
-12
-9
-8
-20
-6
March
-3.1
-4
-2
-6
-6
1
April
4.3
3
3
5
7
8
May
13.5
8
17
16
18
19
June
18.6
21
18
18
19
18
July
23.3
22
24
23
21
24
August
20.0
19
20
21
22
21
September
12.4
16
12
10
13
October
4.2
5
6
4
4
November
-7.4
-3
-10
-6
-5
December
-12.1
-14
-16
-12
-13
Average
4.1
5.1
5.5
4.6
3.1
6.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-23.9
-23
-18
-19
-30
-17
February
-20.5
-19
-17
-16
-28
-12
March
-12.6
-15
-10
-15
-14
-6
April
-5.7
-6
-8
-4
-1
0
May
3.8
0
5
7
6
10
June
10.4
13
9
10
10
10
July
14.3
15
16
14
12
14
August
11.3
12
11
11
13
12
September
4.7
6
4
3
6
October
-2.9
0
0
-2
-2
November
-13.6
-8
-15
-12
-10
December
-19.6
-20
-22
-20
-20
Average
-4.4
-3.2
-3.2
-4.8
-6.9
-2.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
46.3
44
60
53
33
56
February
40.9
44
41
26
28
55
March
35.4
44
33
22
29
24
April
25.4
18
14
26
27
27
May
21.9
31
5
21
22
12
June
18.1
7
13
21
10
28
July
7.2
9
7
4
8
3
August
14.8
16
17
14
8
11
September
24.0
11
13
35
21
October
35.7
31
28
31
37
November
49.5
52
37
63
37
December
50.1
55
44
61
41
Average
26.2
22.7
21.9
21.5
24.5
24.7
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
6.5
6
7
7
5
8
February
6.7
7
6
8
6
9
March
8.8
7
9
8
8
10
April
7.9
7
8
7
8
8
May
7.5
8
7
8
7
7
June
6.2
6
6
6
6
6
July
5.6
5
6
5
6
5
August
5.2
5
5
5
5
5
September
6.0
5
6
7
6
October
7.6
9
8
7
7
November
6.7
7
6
8
7
December
6.5
8
5
7
6
Average
6.7
6.2
6.7
6.4
6.6
6.7
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
189°
235°
193°
132°
205°
February
189°
180°
188°
214°
189°
March
236°
221°
242°
224°
238°
April
181°
261°
227°
220°
191°
May
255°
210°
174°
248°
215°
June
082°
284°
022°
295°
287°
July
051°
122°
014°
315°
005°
August
046°
022°
289°
260°
060°
September
279°
247°
239°
219°
October
224°
214°
244°
255°
November
162°
237°
231°
233°
December
137°
221°
189°
247°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.