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
86.8
89
79
96
89
76
February
80.8
93
82
86
75
77
March
91.3
93
91
91
91
87
April
93.0
90
96
92
90
May
96.5
97
97
95
98
June
97.8
100
100
97
98
July
97.8
100
99
99
97
August
92.6
91
95
98
98
September
88.4
99
99
93
95
October
92.4
93
97
94
88
November
89.5
81
89
94
92
December
84.0
92
72
82
90
Average
91.2
91.5
91.3
93.9
92.1
90.9
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
16.6
16
19
17
16
18
February
19.4
20
20
18
15
19
March
22.7
22
24
22
22
25
April
24.9
24
26
24
26
May
28.7
29
30
27
28
June
28.7
33
33
31
31
July
32.0
33
32
31
32
August
32.7
37
32
32
33
September
30.9
34
31
29
30
October
26.8
27
27
28
26
November
21.0
21
21
21
23
December
18.6
18
21
23
17
Average
24.6
19.3
26.4
25.8
24.9
25.6
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
6.9
6
11
5
7
9
February
10.3
11
11
7
6
9
March
12.7
14
14
10
13
12
April
13.3
16
16
12
4
May
17.4
21
21
11
9
June
18.7
24
23
8
23
July
20.0
18
24
2
25
August
22.4
25
24
13
23
September
21.0
20
20
20
22
October
16.1
15
15
16
17
November
10.6
11
11
9
12
December
9.1
9
12
13
7
Average
14.3
9.8
16.1
15.7
10.8
14.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.5
2
7
2
3
6
February
5.1
5
5
2
6
8
March
2.2
2
4
1
3
2
April
1.5
2
0
3
1
May
2.4
2
1
6
2
June
3.5
1
1
3
2
July
4.3
1
4
5
4
August
4.3
0
5
3
4
September
4.9
3
3
8
4
October
3.7
4
2
1
4
November
4.9
8
9
2
4
December
5.0
4
4
3
4
Average
3.7
3.0
3.1
2.8
3.7
3.7
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
7.9
9
8
8
8
7
February
7.9
8
8
8
8
8
March
7.7
7
8
8
8
8
April
7.8
8
9
7
7
May
6.4
5
6
7
7
June
5.7
6
5
6
6
July
4.6
4
4
4
6
August
4.7
6
5
4
5
September
5.0
5
5
5
6
October
6.1
7
5
6
6
November
6.2
6
7
5
7
December
6.7
6
6
7
7
Average
6.5
7.7
6.4
6.4
6.2
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
038°
132°
353°
301°
074°
February
229°
180°
038°
033°
298°
March
111°
129°
186°
122°
153°
April
081°
148°
098°
105°
May
115°
178°
121°
138°
June
223°
216°
142°
127°
July
221°
205°
213°
171°
August
234°
161°
165°
324°
September
078°
033°
069°
050°
October
085°
035°
132°
044°
November
046°
045°
051°
051°
December
064°
112°
171°
103°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.