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
84.8
88
82
80
84
95
February
82.4
85
90
91
80
98
March
91.6
87
98
97
100
94
April
96.8
98
97
100
97
99
May
97.6
98
99
100
98
97
June
99.3
100
100
100
100
98
July
99.6
100
99
100
100
100
August
99.6
100
99
100
100
100
September
98.8
98
100
98
98
October
89.9
88
94
93
91
November
85.7
96
91
80
79
December
78.3
81
72
82
65
Average
93.7
95.2
94.8
95.5
94.0
94.0
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
8.6
9
9
10
7
10
February
11.8
13
12
13
12
14
March
14.7
14
16
14
15
14
April
18.5
19
18
18
17
20
May
22.1
21
22
25
21
23
June
27.7
26
27
30
28
26
July
30.2
30
29
34
29
29
August
30.2
32
30
31
29
30
September
25.0
26
25
25
25
October
19.6
21
22
18
17
November
12.7
13
14
12
14
December
8.6
11
7
9
7
Average
19.4
20.5
19.5
20.6
18.4
18.9
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
-2.1
-2
1
-3
-2
-2
February
0.4
3
0
0
2
0
March
2.9
6
4
2
1
3
April
6.5
6
6
6
5
6
May
11.7
12
13
14
9
12
June
16.5
16
18
18
17
14
July
18.8
20
19
21
18
18
August
18.7
20
19
19
17
19
September
14.0
16
14
13
14
October
9.7
12
12
7
8
November
3.6
2
3
4
3
December
-1.5
1
0
-2
1
Average
8.6
10.2
9.1
9.1
7.4
8.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.9
3
14
2
19
0
February
8.0
19
4
1
9
2
March
9.1
25
3
4
2
8
April
8.7
10
4
4
9
9
May
11.2
20
16
7
9
7
June
4.2
8
4
3
1
10
July
1.8
1
2
0
4
1
August
2.1
1
3
1
2
4
September
4.4
7
7
4
6
October
9.5
11
7
8
13
November
12.7
10
9
18
1
December
11.9
12
17
7
20
Average
7.1
10.7
6.9
4.5
6.9
6.4
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
4.4
4
4
4
4
4
February
4.7
4
5
6
4
6
March
5.4
6
5
5
5
6
April
5.8
7
5
6
6
5
May
5.4
5
5
5
6
5
June
5.4
5
5
6
5
6
July
5.3
5
5
6
6
5
August
5.4
5
5
5
5
5
September
4.7
5
5
5
5
October
4.3
4
4
4
5
November
4.2
5
3
4
3
December
4.1
4
4
3
4
Average
5.1
5.1
4.8
5.2
4.9
4.8
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
325°
335°
278°
329°
267°
February
356°
253°
011°
222°
327°
March
036°
341°
138°
340°
006°
April
007°
147°
099°
050°
217°
May
359°
337°
073°
153°
196°
June
262°
289°
325°
257°
298°
July
267°
021°
270°
311°
241°
August
288°
006°
215°
322°
060°
September
358°
359°
010°
054°
October
011°
011°
042°
137°
November
341°
293°
339°
259°
December
032°
003°
298°
359°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.