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
85.0
83
82
86
83
100
February
81.1
94
85
89
77
85
March
89.6
91
88
96
91
83
April
90.0
95
86
94
85
82
May
93.3
93
97
91
97
June
95.0
97
98
95
94
July
93.9
97
98
86
95
August
96.9
98
94
98
98
September
95.3
100
97
97
93
October
91.2
93
96
90
November
85.0
84
74
93
87
December
87.5
96
83
86
95
Average
90.5
90.7
91.9
92.6
89.4
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
20.0
18
22
19
21
8
February
21.7
23
23
19
19
19
March
25.8
25
26
25
26
28
April
28.4
29
26
29
28
30
May
31.6
30
33
30
32
June
34.6
36
36
32
33
July
35.3
37
36
33
36
August
35.6
38
34
35
37
September
33.2
36
32
34
32
October
29.1
29
29
30
November
23.8
22
21
24
27
December
21.7
22
21
25
22
Average
28.0
23.3
28.9
28.1
28.2
29.8
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
8.0
7
10
7
9
6
February
10.0
12
10
5
8
7
March
14.0
15
15
10
13
19
April
15.5
19
16
19
18
18
May
19.1
20
22
21
21
June
20.3
23
22
24
23
July
19.8
24
23
23
25
August
21.0
24
23
24
24
September
20.9
23
21
22
23
October
16.5
19
16
19
November
11.3
14
13
11
16
December
10.3
10
14
14
9
Average
15.6
13.0
17.4
16.2
17.2
18.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.2
1
1
3
3
0
February
2.3
0
0
3
3
1
March
2.0
1
3
0
2
2
April
1.8
0
3
0
4
3
May
1.1
0
0
3
1
June
1.8
0
1
2
4
July
1.9
0
1
6
3
August
1.8
0
1
2
1
September
3.1
0
2
2
5
October
1.8
0
0
1
November
2.6
0
5
3
3
December
2.9
0
2
2
1
Average
1.9
0.5
0.7
1.2
2.7
2.3
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
8.2
9
8
7
8
7
February
8.7
9
9
9
9
9
March
9.6
8
10
11
10
10
April
9.4
10
9
11
9
8
May
9.0
6
11
9
9
June
8.3
8
9
6
8
July
7.6
8
9
6
8
August
7.4
8
7
6
7
September
5.3
6
4
6
8
October
6.7
7
7
6
November
7.1
7
8
6
7
December
7.4
7
7
8
8
Average
8.1
8.8
7.8
8.4
7.4
8.1
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
031°
074°
007°
045°
009°
February
121°
112°
037°
083°
006°
March
115°
123°
134°
102°
129°
April
137°
108°
133°
113°
099°
May
112°
151°
125°
141°
June
161°
152°
139°
133°
July
155°
149°
138°
151°
August
146°
145°
141°
150°
September
146°
096°
095°
027°
October
093°
110°
111°
November
069°
058°
091°
096°
December
074°
125°
159°
254°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.