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
84.8
74
79
98
92
72
February
79.6
87
80
79
79
80
March
91.0
88
89
94
90
83
April
92.6
90
93
93
89
May
94.2
95
95
92
93
June
96.9
96
99
97
97
July
96.8
96
96
96
98
August
94.9
100
88
95
98
September
91.7
94
98
94
72
October
89.7
92
91
96
81
November
88.5
85
87
89
90
December
84.9
91
82
87
83
Average
90.0
82.7
90.6
91.7
92.0
86.3
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
14.7
13
17
16
14
15
February
17.2
21
19
16
12
16
March
21.6
22
22
22
22
23
April
23.8
23
26
23
23
May
28.6
29
30
27
27
June
32.5
33
34
32
32
July
34.0
35
36
33
33
August
33.6
38
33
34
31
September
31.3
33
31
31
30
October
26.0
26
26
28
24
November
19.6
20
19
20
22
December
16.9
18
18
22
16
Average
24.3
18.3
26.0
25.9
24.9
24.2
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
3.6
2
6
1
4
5
February
6.1
8
7
2
2
5
March
10.2
11
11
8
10
13
April
12.2
12
14
12
12
May
17.7
18
20
17
17
June
21.8
22
22
22
22
July
23.5
22
25
23
24
August
22.5
24
23
23
19
September
19.8
20
19
19
20
October
13.5
14
12
16
12
November
7.4
9
8
6
9
December
6.0
5
10
11
3
Average
13.0
7.2
14.3
13.7
13.9
13.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.6
23
17
4
6
11
February
12.1
11
18
15
9
13
March
7.1
9
8
10
5
13
April
6.9
15
10
6
6
May
6.3
9
3
7
8
June
4.7
2
5
4
5
July
3.5
5
7
3
5
August
4.6
0
15
4
4
September
3.6
7
4
2
5
October
5.3
7
5
2
7
November
5.6
5
13
3
4
December
7.8
6
17
3
10
Average
7.0
14.1
8.3
8.7
4.4
7.5
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
7.8
8
8
8
8
7
February
7.6
9
8
7
7
7
March
8.1
7
9
9
9
8
April
7.8
7
9
7
7
May
7.3
6
9
7
8
June
6.3
6
6
6
7
July
5.6
6
6
5
6
August
5.3
6
5
5
6
September
5.0
5
4
5
6
October
6.5
7
7
7
6
November
6.1
6
5
6
6
December
7.1
7
8
8
7
Average
6.8
7.7
6.6
6.9
6.5
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
187°
207°
284°
296°
157°
February
158°
211°
259°
117°
278°
March
136°
189°
201°
161°
169°
April
195°
143°
151°
132°
May
161°
162°
150°
150°
June
180°
197°
169°
167°
July
223°
198°
207°
181°
August
264°
144°
152°
021°
September
096°
047°
095°
028°
October
221°
214°
221°
098°
November
267°
106°
186°
113°
December
232°
206°
192°
209°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.