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
97.1
99
99
100
91
97
February
96.3
99
97
96
93
92
March
94.0
96
91
95
95
92
April
97.6
96
97
97
99
98
May
97.3
99
99
98
97
94
June
92.5
88
97
95
97
90
July
93.5
97
94
97
97
99
August
96.2
97
90
100
100
93
September
99.0
100
98
99
99
October
99.1
98
99
100
99
November
96.0
96
93
94
97
December
97.7
98
100
98
100
Average
96.2
96.1
96.1
97.3
96.7
95.6
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
-7.3
-6
-8
-8
-9
-4
February
-3.5
-1
-2
-4
-3
-2
March
5.9
5
8
5
7
5
April
13.3
15
13
14
13
11
May
19.0
18
20
19
19
19
June
21.3
21
24
21
23
22
July
26.0
27
27
25
28
25
August
25.7
27
26
26
27
26
September
22.3
24
22
23
21
October
15.0
17
14
15
15
November
4.0
2
6
6
5
December
-6.4
-6
-6
-6
-5
Average
11.8
13.3
11.9
11.5
11.7
11.5
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
-21.6
-18
-25
-20
-23
-19
February
-16.6
-14
-16
-15
-15
-14
March
-6.2
-8
-5
-4
-5
-4
April
0.6
3
1
1
0
-1
May
6.9
7
7
7
7
7
June
13.1
13
14
13
14
14
July
18.2
19
19
19
20
17
August
18.0
19
20
17
17
19
September
11.1
12
10
13
13
October
1.8
2
3
1
2
November
-8.7
-7
-6
-5
-7
December
-18.2
-18
-21
-19
-18
Average
0.6
2.7
0.5
0.9
0.5
0.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.6
2
0
1
13
3
February
5.5
4
6
4
8
11
March
8.2
12
6
7
11
12
April
5.5
5
7
4
4
9
May
8.6
13
4
8
7
6
June
10.2
14
8
12
9
16
July
9.9
15
11
15
2
4
August
12.8
4
23
11
5
11
September
5.7
3
6
6
15
October
4.3
1
3
5
6
November
8.6
16
9
10
8
December
3.9
4
1
4
0
Average
7.6
8.8
7.5
7.3
6.9
8.6
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
7.3
8
6
8
7
6
February
7.8
9
7
8
8
8
March
8.1
9
7
8
9
8
April
9.3
8
10
9
11
9
May
8.5
8
9
8
8
9
June
7.4
7
7
7
8
7
July
6.8
7
7
7
7
7
August
6.5
7
6
7
6
7
September
6.9
6
7
5
8
October
7.9
7
8
7
9
November
6.9
8
7
7
6
December
6.9
7
6
8
6
Average
7.6
7.7
7.3
7.5
7.6
7.6
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
356°
353°
356°
342°
336°
February
351°
005°
352°
338°
351°
March
330°
272°
301°
302°
311°
April
260°
300°
228°
247°
300°
May
271°
250°
241°
218°
232°
June
230°
218°
222°
206°
220°
July
255°
224°
223°
210°
221°
August
239°
251°
226°
226°
207°
September
261°
230°
232°
206°
October
320°
312°
342°
294°
November
342°
329°
336°
332°
December
356°
335°
357°
348°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.