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
84.6
88
85
81
92
79
February
91.4
94
91
92
92
90
March
94.4
95
93
96
92
94
April
97.5
97
97
97
100
100
May
98.5
99
99
100
100
99
June
99.0
99
99
100
98
100
July
97.6
98
99
100
99
99
August
98.0
96
98
99
98
September
96.6
97
91
98
96
October
93.5
89
95
94
89
November
88.0
92
87
87
97
December
80.6
84
96
82
83
Average
94.7
96.5
94.5
95.4
95.4
94.7
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
-11.2
-9
-9
-9
-15
-7
February
-9.7
-10
-8
-7
-9
-4
March
-1.7
0
2
-3
-2
1
April
10.5
10
7
12
9
16
May
18.8
17
18
23
21
22
June
23.9
26
25
24
22
23
July
25.3
27
27
24
26
26
August
23.5
24
22
24
25
September
16.3
17
18
15
16
October
8.4
10
9
8
7
November
-4.9
1
-6
-3
-2
December
-10.0
-9
-15
-6
-13
Average
7.9
8.8
8.8
8.4
7.6
9.1
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
-19.9
-18
-15
-17
-24
-14
February
-16.0
-18
-15
-14
-18
-10
March
-9.9
-7
-6
-11
-10
-7
April
0.2
1
-4
2
-1
4
May
7.4
7
6
10
9
11
June
13.5
16
15
13
12
12
July
15.1
17
17
14
15
15
August
12.7
14
12
13
14
September
6.5
8
6
6
7
October
0.3
2
0
0
0
November
-10.9
-5
-11
-9
-7
December
-17.6
-16
-21
-12
-18
Average
-1.0
-1.9
0.0
-1.3
-2.5
0.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
31.7
30
48
17
33
42
February
20.8
27
12
19
29
25
March
14.6
16
13
17
25
14
April
6.8
13
5
6
3
1
May
6.1
13
4
2
3
2
June
5.1
3
6
5
8
4
July
3.0
3
3
4
2
3
August
3.8
7
2
2
3
September
7.5
8
9
7
11
October
13.0
9
15
13
16
November
31.9
20
35
44
27
December
34.0
30
22
34
40
Average
12.4
12.9
11.5
10.6
13.6
12.6
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
8.6
9
12
6
9
10
February
8.1
10
6
8
10
9
March
9.7
11
10
11
11
11
April
10.0
9
11
9
10
9
May
10.0
8
9
10
10
9
June
8.2
7
8
9
8
8
July
7.0
5
7
8
7
8
August
7.1
7
7
7
8
September
8.7
6
9
10
9
October
9.8
9
9
10
11
November
9.6
9
9
11
9
December
8.2
10
6
9
8
Average
8.7
8.2
8.6
8.6
9.1
9.1
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
201°
225°
190°
225°
212°
February
217°
201°
205°
216°
208°
March
223°
239°
232°
224°
232°
April
262°
262°
245°
271°
199°
May
249°
009°
280°
303°
292°
June
252°
265°
255°
310°
292°
July
236°
268°
314°
351°
347°
August
244°
325°
353°
312°
September
218°
292°
240°
231°
October
220°
224°
216°
234°
November
209°
230°
213°
213°
December
212°
228°
211°
227°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.