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
69.2
82
59
90
67
81
February
82.4
89
91
98
67
97
March
88.8
89
94
95
82
93
April
95.2
92
94
97
94
100
May
97.6
98
99
100
98
99
June
97.8
100
99
100
98
95
July
99.2
99
100
100
99
99
August
99.4
100
100
98
99
September
98.8
100
97
100
98
October
91.2
99
100
92
84
November
72.7
93
74
82
76
December
59.7
77
46
50
38
Average
90.3
93.6
93.2
94.2
88.0
90.3
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
4.5
5
8
7
5
6
February
8.7
14
8
11
8
11
March
12.8
14
14
11
10
15
April
18.4
21
16
18
16
20
May
23.2
23
22
25
23
23
June
28.4
32
28
28
26
27
July
30.8
34
33
32
31
31
August
31.5
33
32
31
32
September
26.0
29
24
24
27
October
19.7
23
20
16
20
November
11.4
13
13
12
10
December
6.1
8
6
5
6
Average
18.6
20.4
19.5
19.2
17.2
19.0
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
-4.5
-4
1
-3
-2
-3
February
-2.9
2
-1
-1
-1
-1
March
1.6
4
2
-1
0
3
April
5.8
8
6
5
4
4
May
11.1
10
11
11
11
10
June
16.3
18
15
16
16
15
July
18.0
20
18
18
19
18
August
18.0
19
19
18
18
September
13.0
16
12
11
14
October
7.5
9
7
6
10
November
3.8
3
5
3
3
December
-1.8
0
1
0
2
Average
7.6
8.3
8.2
7.7
7.1
7.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.7
10
22
3
26
3
February
10.5
3
4
8
9
9
March
11.8
15
9
9
17
8
April
10.5
9
19
12
15
1
May
8.0
7
7
2
11
9
June
5.2
1
4
4
12
6
July
3.3
1
2
2
1
2
August
1.4
1
1
3
1
September
2.1
0
5
1
3
October
6.3
1
0
14
9
November
11.4
16
11
11
6
December
14.9
10
16
19
20
Average
7.6
6.2
7.4
5.3
10.8
5.8
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
7.5
7
8
8
8
6
February
8.3
8
8
9
7
8
March
7.9
8
7
8
7
9
April
7.8
8
7
9
7
7
May
7.1
8
7
6
7
7
June
6.2
6
7
6
5
6
July
5.9
6
7
6
6
6
August
6.6
8
7
6
7
September
7.4
9
7
7
7
October
6.5
6
5
7
7
November
6.7
8
6
6
5
December
6.9
7
7
7
7
Average
7.0
7.3
7.3
7.0
6.6
6.9
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
239°
076°
258°
298°
278°
February
239°
254°
297°
289°
271°
March
066°
238°
058°
347°
073°
April
172°
057°
244°
293°
129°
May
083°
071°
078°
322°
315°
June
103°
062°
036°
338°
311°
July
059°
314°
052°
053°
051°
August
063°
037°
069°
068°
September
064°
271°
041°
069°
October
237°
139°
065°
288°
November
258°
059°
085°
331°
December
237°
074°
187°
050°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.