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
88.0
88
84
93
87
87
February
85.4
96
87
88
82
89
March
91.6
86
92
94
89
92
April
94.4
94
95
91
91
May
97.2
96
99
95
98
June
97.8
98
98
98
98
July
98.0
97
98
98
97
August
97.4
98
95
99
99
September
96.7
100
99
97
93
October
94.1
97
98
96
92
November
91.2
89
89
96
90
December
90.5
93
86
93
88
Average
93.3
89.7
93.8
94.9
93.7
93.1
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
19.0
17
21
19
19
20
February
21.1
22
22
19
17
21
March
24.8
24
25
24
25
26
April
27.0
26
29
27
27
May
30.7
30
32
30
31
June
33.6
35
36
33
33
July
34.7
36
37
34
34
August
35.1
39
34
35
35
September
32.8
36
33
32
31
October
28.6
28
29
30
28
November
23.1
22
22
24
26
December
20.8
20
22
25
20
Average
26.8
21.1
28.0
28.2
27.5
27.6
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
8.4
6
11
7
9
11
February
10.7
12
11
6
7
10
March
14.8
14
16
12
14
18
April
16.5
16
19
16
16
May
21.2
21
22
21
21
June
23.7
24
24
24
22
July
24.8
26
25
25
25
August
24.6
26
25
26
25
September
22.7
24
21
22
22
October
17.6
18
16
20
17
November
12.5
12
12
12
15
December
10.2
9
14
16
8
Average
16.5
10.6
17.5
17.1
17.7
17.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.2
9
7
7
5
9
February
5.7
3
5
4
7
6
March
4.0
3
5
4
5
4
April
4.1
8
2
7
5
May
3.5
5
2
10
2
June
3.7
1
0
6
3
July
3.1
2
3
7
4
August
4.2
0
5
1
2
September
5.2
3
2
4
7
October
4.1
6
3
4
3
November
7.4
11
18
3
5
December
5.5
5
3
2
9
Average
4.8
5.0
4.8
4.2
5.0
4.8
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
8.8
9
9
9
9
8
February
9.3
10
9
9
9
9
March
9.5
8
10
10
10
10
April
10.0
10
11
10
9
May
8.9
7
10
10
9
June
7.7
8
7
7
8
July
6.5
6
7
6
8
August
6.7
7
7
6
6
September
6.5
6
5
6
8
October
7.7
9
7
7
7
November
7.7
7
8
7
7
December
8.0
7
8
9
8
Average
8.2
8.8
7.9
8.2
7.8
8.2
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
005°
221°
349°
330°
100°
February
211°
207°
008°
065°
240°
March
139°
144°
174°
119°
153°
April
120°
149°
114°
107°
May
143°
163°
138°
157°
June
189°
163°
162°
146°
July
203°
179°
168°
173°
August
157°
170°
164°
175°
September
130°
087°
079°
032°
October
099°
127°
132°
059°
November
047°
073°
098°
078°
December
070°
153°
183°
157°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.