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
80.7
72
76
91
85
70
February
76.6
91
79
83
75
78
March
83.4
85
87
90
87
67
April
90.0
87
93
92
83
May
91.6
92
89
86
95
June
94.1
96
98
93
87
July
94.5
99
98
94
88
August
95.0
99
87
95
96
September
90.9
93
99
96
88
October
89.9
89
91
91
83
November
88.3
85
80
89
89
December
84.5
92
66
84
88
Average
88.2
82.6
89.6
89.6
89.5
84.8
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
15.3
14
18
16
15
16
February
17.7
21
20
16
14
17
March
22.0
22
23
22
22
23
April
24.1
24
26
23
24
May
28.3
24
31
27
28
June
31.6
33
28
32
32
July
34.3
36
37
33
33
August
34.7
39
34
34
34
September
30.0
33
32
32
29
October
26.1
26
27
28
25
November
20.1
20
19
20
23
December
17.4
18
19
22
17
Average
24.3
18.6
26.0
25.8
25.3
25.1
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
3.3
2
6
2
4
6
February
6.1
8
8
1
4
5
March
10.0
11
11
6
10
14
April
12.1
12
14
12
13
May
17.0
13
19
16
17
June
20.6
22
15
22
21
July
23.1
23
24
22
24
August
22.7
24
23
22
22
September
18.6
21
18
19
20
October
13.5
14
12
15
13
November
7.8
8
9
7
9
December
5.7
4
11
11
3
Average
12.5
6.8
13.7
13.0
13.8
13.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.7
15
0
3
4
1
February
8.9
6
1
12
9
6
March
4.7
8
0
5
4
10
April
3.1
0
2
4
5
May
3.2
5
2
7
3
June
2.5
1
1
4
3
July
1.7
1
1
2
4
August
3.3
0
3
2
2
September
3.1
3
1
0
3
October
5.4
7
3
0
2
November
3.8
7
0
1
3
December
6.4
5
0
3
12
Average
4.8
9.2
2.3
2.7
3.1
4.4
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
6.8
7
7
7
7
7
February
7.1
8
8
7
7
7
March
7.0
6
7
8
7
7
April
6.5
7
5
7
6
May
5.1
5
0
7
7
June
5.8
5
5
6
7
July
5.2
5
6
4
5
August
5.3
6
5
5
5
September
4.6
4
4
5
6
October
5.9
6
6
6
5
November
5.6
5
5
5
6
December
6.2
6
6
7
6
Average
6.0
6.9
5.8
5.2
6.0
6.1
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
296°
237°
286°
288°
154°
February
215°
216°
278°
164°
259°
March
152°
159°
205°
152°
160°
April
143°
203°
136°
125°
May
141°
360°
138°
148°
June
186°
184°
163°
164°
July
215°
191°
192°
173°
August
210°
176°
152°
177°
September
131°
100°
098°
018°
October
141°
181°
217°
116°
November
171°
111°
168°
113°
December
243°
190°
193°
229°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.