Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
88.2
87
77
88
83
94
February
87.6
90
89
90
67
93
March
89.7
82
87
91
92
91
April
93.0
87
89
94
93
96
May
89.7
91
81
93
81
June
92.4
86
93
92
89
July
96.7
95
96
97
99
August
94.0
91
91
94
96
September
89.6
84
81
96
90
October
87.6
89
76
89
88
November
88.5
69
91
94
88
December
90.5
94
86
88
92
Average
90.7
86.2
88.0
88.4
90.6
91.7
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi 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
12.3
14
15
11
10
15
February
15.6
14
18
16
12
16
March
17.0
18
17
20
18
19
April
21.6
22
23
21
22
20
May
24.8
23
25
25
21
June
28.6
27
30
28
27
July
30.6
31
31
30
33
August
30.1
30
30
31
30
September
27.3
26
26
30
26
October
22.2
25
20
24
17
November
17.5
13
20
18
20
December
14.4
16
12
18
13
Average
21.3
16.9
22.3
22.1
22.3
21.3
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
1.0
-1
1
-1
2
4
February
3.6
1
3
1
3
7
March
4.6
5
2
3
7
9
April
8.5
9
6
4
9
8
May
13.0
9
6
13
14
June
15.3
2
8
19
20
July
17.1
6
10
21
23
August
16.5
8
1
22
22
September
13.7
5
1
16
19
October
7.0
6
4
2
-3
November
4.1
2
1
2
5
December
2.2
1
0
2
2
Average
8.4
3.5
4.3
3.4
9.7
10.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.4
7
1
16
12
5
February
11.9
8
15
10
21
11
March
8.9
20
6
10
5
8
April
5.9
5
9
5
3
7
May
7.4
9
8
6
17
June
6.6
3
3
8
24
July
6.3
7
7
6
3
August
6.6
9
5
7
4
September
5.8
5
7
6
10
October
5.1
5
4
4
10
November
8.3
14
13
3
7
December
10.9
13
9
5
8
Average
7.8
10.4
8.0
7.6
6.8
8.8
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
8.6
9
6
10
8
9
February
9.3
10
9
9
10
11
March
10.3
10
9
10
11
10
April
10.1
10
10
10
9
12
May
9.3
9
10
9
10
June
7.5
8
6
8
8
July
7.6
7
8
8
7
August
6.5
7
6
6
6
September
7.4
7
7
7
8
October
7.7
7
8
7
7
November
8.2
6
8
9
8
December
7.2
7
7
7
8
Average
8.5
9.5
7.7
8.1
8.2
8.5
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
260°
247°
335°
319°
281°
February
344°
291°
341°
343°
259°
March
051°
305°
240°
050°
304°
April
272°
150°
235°
290°
260°
May
026°
342°
043°
022°
June
164°
130°
202°
191°
July
201°
212°
206°
209°
August
188°
193°
195°
203°
September
013°
050°
062°
036°
October
003°
356°
322°
030°
November
002°
037°
337°
353°
December
097°
359°
317°
290°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.