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
91.8
94
90
87
96
96
February
94.2
97
94
90
95
93
March
95.4
98
93
92
93
95
April
97.7
100
95
100
96
96
May
98.4
99
92
100
100
100
June
99.2
100
97
100
99
100
July
99.8
100
100
100
100
100
August
99.6
99
100
100
100
100
September
99.8
100
100
100
100
100
October
98.6
100
99
99
99
99
November
94.9
97
97
92
94
December
91.0
89
77
96
92
Average
97.2
98.8
95.6
96.4
97.4
97.3
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
7.8
10
11
5
9
7
February
10.6
13
8
9
12
9
March
13.2
15
13
7
11
15
April
19.3
24
16
21
19
18
May
23.9
24
21
24
27
24
June
28.3
35
26
27
26
28
July
32.6
35
33
32
33
34
August
32.9
35
36
32
33
33
September
28.7
29
29
29
26
31
October
22.6
24
24
21
21
24
November
16.2
17
17
18
15
December
10.7
13
13
9
12
Average
20.9
24.1
20.5
19.8
20.4
20.8
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
-2.4
1
0
-5
0
-3
February
-1.2
0
-5
-1
-1
0
March
1.2
2
2
-4
0
3
April
5.2
6
4
5
5
8
May
9.2
8
9
8
10
11
June
13.2
17
13
14
12
12
July
16.5
18
15
16
18
17
August
16.5
17
17
17
16
16
September
12.3
13
12
12
11
14
October
7.0
6
8
7
6
9
November
2.9
6
3
4
2
December
1.2
2
4
2
1
Average
7.1
8.7
7.0
6.4
6.7
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.0
11
6
12
10
5
February
6.3
3
6
12
4
14
March
7.8
5
13
14
10
6
April
3.4
1
9
5
1
3
May
3.3
4
7
2
0
3
June
1.0
0
3
1
2
1
July
0.1
0
0
0
0
0
August
0.2
0
0
0
0
0
September
0.7
1
1
0
2
0
October
1.3
0
2
2
1
1
November
3.7
8
2
3
2
December
6.5
7
1
8
3
Average
3.2
2.3
4.9
4.0
3.0
2.7
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
7.3
8
6
7
8
7
February
7.0
6
6
7
7
7
March
7.4
6
7
7
7
7
April
7.1
8
7
8
8
7
May
6.3
6
5
7
8
6
June
6.0
7
6
6
6
7
July
7.2
8
7
9
8
7
August
6.4
7
7
6
6
6
September
6.2
6
6
7
6
6
October
6.0
6
5
6
6
6
November
6.4
8
5
8
7
December
6.4
6
5
7
6
Average
6.6
6.7
6.2
6.8
7.1
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
134°
126°
113°
171°
089°
February
113°
117°
118°
117°
180°
March
235°
256°
069°
263°
099°
April
202°
223°
252°
257°
104°
May
287°
278°
357°
288°
290°
June
030°
006°
293°
332°
278°
July
056°
036°
052°
049°
031°
August
028°
321°
324°
029°
007°
September
275°
070°
310°
340°
320°
October
072°
079°
076°
090°
271°
November
215°
119°
116°
082°
December
113°
117°
138°
132°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.