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
86.5
80
82
99
87
75
February
82.4
92
81
84
81
84
March
92.7
89
93
95
94
84
April
93.1
91
93
94
89
May
95.7
97
96
94
96
June
97.1
94
100
97
99
July
97.7
98
98
97
99
August
96.4
100
88
97
100
September
95.2
95
100
94
88
October
92.4
92
94
97
88
November
89.4
90
85
91
92
December
87.0
95
79
91
86
Average
91.9
87.2
92.6
92.9
93.1
90.3
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
14.9
13
17
16
14
16
February
17.0
20
19
17
12
17
March
21.9
22
23
22
23
23
April
24.6
23
26
24
24
May
29.2
29
31
27
28
June
32.6
33
35
32
32
July
34.4
35
36
33
33
August
34.4
38
34
34
34
September
31.8
33
31
31
30
October
26.1
26
27
28
24
November
19.9
19
19
20
22
December
17.2
17
18
22
16
Average
24.5
18.3
26.1
26.1
25.0
24.9
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
4.9
2
8
3
5
7
February
6.3
9
9
3
2
6
March
11.2
12
12
9
11
14
April
13.6
14
14
13
14
May
19.0
19
21
18
18
June
23.3
23
24
23
23
July
25.0
25
26
23
25
August
24.7
26
25
25
24
September
21.5
22
20
20
21
October
15.0
16
13
17
14
November
8.7
10
9
8
10
December
7.3
6
11
13
5
Average
14.2
7.7
15.7
15.0
14.9
15.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.2
12
10
2
5
9
February
9.0
8
10
12
4
11
March
6.5
7
1
20
4
10
April
4.3
10
3
3
6
May
3.4
1
3
3
5
June
2.4
1
1
2
1
July
1.9
1
3
2
3
August
3.1
0
8
3
1
September
2.9
2
1
3
4
October
3.7
4
2
1
4
November
3.9
3
8
1
2
December
5.3
2
7
3
8
Average
4.8
8.7
3.6
5.6
2.7
5.2
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
7.5
8
8
8
7
7
February
7.6
9
8
7
7
8
March
7.9
7
9
8
8
8
April
7.6
7
8
7
7
May
7.2
6
8
8
8
June
6.5
5
6
6
7
July
6.0
6
7
5
6
August
5.7
6
6
5
6
September
5.3
5
4
5
7
October
6.2
7
6
6
6
November
6.0
6
5
6
6
December
6.9
7
7
8
7
Average
6.8
7.5
6.5
6.7
6.6
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
332°
212°
300°
297°
143°
February
201°
217°
271°
062°
268°
March
142°
154°
189°
149°
167°
April
121°
163°
140°
120°
May
124°
174°
138°
142°
June
219°
135°
169°
175°
July
224°
207°
221°
185°
August
289°
123°
143°
334°
September
073°
073°
070°
021°
October
156°
193°
207°
072°
November
075°
066°
149°
102°
December
210°
196°
187°
219°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.