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
88.9
79
95
94
90
82
February
86.2
93
91
93
81
94
March
92.9
96
87
97
98
85
April
94.2
98
98
92
92
May
94.8
99
95
88
91
June
97.0
97
98
94
99
July
97.8
94
100
98
97
August
96.1
97
98
94
98
September
95.3
98
100
98
89
October
91.7
93
95
96
85
November
92.4
93
81
99
95
December
86.7
88
69
93
89
Average
92.7
89.6
94.2
94.4
93.5
91.4
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
13.0
10
15
14
12
14
February
15.0
19
16
15
7
15
March
20.5
21
19
21
20
22
April
23.2
23
25
22
23
May
27.6
28
29
24
27
June
32.4
32
33
31
33
July
35.1
35
38
33
34
August
34.6
38
35
33
35
September
31.4
33
33
33
28
October
24.7
25
25
27
23
November
18.9
20
16
20
21
December
14.9
15
14
20
15
Average
23.4
16.9
24.9
25.2
23.5
24.1
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
-1.4
-3
1
-4
1
3
February
1.5
4
2
-3
-3
2
March
7.0
8
7
4
8
9
April
10.1
9
12
10
10
May
16.0
16
17
16
15
June
20.5
20
21
21
19
July
20.1
9
23
22
23
August
20.0
11
22
23
20
September
18.1
19
18
18
15
October
11.0
12
10
13
9
November
4.8
5
5
5
7
December
2.4
3
5
5
0
Average
9.9
2.8
9.4
10.9
11.6
11.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.9
6
4
0
2
9
February
6.5
5
6
4
7
5
March
2.8
3
2
3
3
6
April
2.8
1
0
5
2
May
3.3
2
2
9
7
June
1.3
1
1
2
1
July
1.6
2
2
2
2
August
1.6
0
3
3
1
September
3.2
1
1
1
4
October
5.6
7
5
2
6
November
3.1
4
7
0
2
December
4.0
4
2
1
6
Average
3.3
4.4
2.6
2.3
2.9
3.9
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
7.4
7
8
8
8
7
February
8.2
8
8
9
9
8
March
8.8
9
9
9
10
8
April
8.9
9
11
9
8
May
7.0
5
9
7
7
June
6.1
5
7
6
7
July
5.1
6
6
4
5
August
5.5
6
6
5
5
September
5.4
6
6
5
4
October
6.8
7
6
8
7
November
7.1
6
7
7
8
December
6.9
7
7
7
9
Average
7.0
7.9
6.6
7.7
6.9
6.7
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
006°
242°
346°
319°
086°
February
246°
234°
301°
012°
319°
March
173°
164°
203°
175°
152°
April
115°
153°
123°
110°
May
143°
147°
118°
119°
June
129°
138°
158°
171°
July
155°
157°
172°
146°
August
130°
138°
163°
143°
September
127°
160°
146°
088°
October
073°
200°
196°
086°
November
155°
104°
177°
166°
December
265°
326°
185°
233°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.