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
84.7
80
74
96
87
79
February
80.7
90
80
86
73
76
March
90.0
86
89
93
89
85
April
92.0
92
87
95
90
94
May
94.5
96
92
94
97
June
96.0
98
97
95
96
July
95.3
96
96
94
91
August
94.4
98
89
98
96
September
93.3
98
93
94
92
October
91.0
92
97
91
89
November
87.2
80
84
93
86
December
82.6
89
74
80
95
Average
90.2
87.2
90.0
91.4
90.3
90.0
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
17.7
17
21
17
17
18
February
20.6
22
21
20
16
19
March
23.6
24
25
23
23
25
April
26.0
27
26
27
24
27
May
29.7
30
31
28
28
June
32.2
35
34
31
32
July
33.0
35
33
33
33
August
33.3
38
32
33
33
September
31.6
34
32
30
30
October
27.7
28
27
28
27
November
22.0
22
22
22
24
December
19.5
20
22
23
18
Average
25.9
22.2
27.8
26.7
25.6
26.1
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
7.6
6
11
5
7
10
February
10.7
11
12
7
6
10
March
13.3
14
15
10
13
16
April
15.8
18
17
16
14
16
May
20.4
21
22
20
19
June
23.6
25
24
24
23
July
24.4
25
25
24
25
August
23.8
25
23
24
24
September
21.5
23
21
22
22
October
17.0
17
15
19
17
November
10.6
11
11
9
13
December
9.7
9
13
14
7
Average
16.0
12.1
17.5
16.0
16.2
16.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.6
6
10
2
3
6
February
4.5
6
6
2
4
6
March
2.8
3
3
2
2
4
April
2.3
1
3
2
4
1
May
2.5
1
2
6
3
June
4.2
1
2
6
3
July
5.3
1
8
4
8
August
3.5
1
8
2
1
September
4.5
2
3
7
2
October
3.1
6
1
2
1
November
4.2
8
9
1
0
December
5.6
6
4
3
4
Average
4.0
3.9
3.7
3.7
3.6
3.1
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
7.7
8
7
9
8
7
February
8.2
8
8
9
9
8
March
7.7
7
8
8
8
8
April
7.3
7
7
8
7
7
May
6.1
5
6
6
6
June
5.9
7
5
5
6
July
4.9
5
4
4
6
August
4.8
6
4
5
5
September
4.7
4
5
5
6
October
5.8
6
6
5
6
November
6.0
6
7
5
6
December
6.6
6
6
7
7
Average
6.4
7.4
6.2
6.3
6.0
6.6
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
336°
211°
345°
292°
013°
February
216°
209°
017°
021°
292°
March
094°
179°
219°
138°
177°
April
168°
052°
181°
084°
338°
May
122°
201°
135°
189°
June
223°
239°
170°
155°
July
233°
229°
239°
233°
August
268°
215°
281°
337°
September
008°
027°
040°
036°
October
012°
028°
331°
016°
November
024°
023°
016°
029°
December
329°
169°
200°
354°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.