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
86.2
81
87
96
88
77
February
82.8
91
82
90
81
88
March
89.9
94
87
89
98
77
April
88.9
95
90
85
88
May
92.6
91
94
88
94
June
95.2
97
100
90
97
July
95.5
99
89
95
98
August
96.8
99
97
96
100
September
95.0
97
99
99
90
October
85.9
92
94
92
61
November
84.4
83
83
92
77
December
86.9
94
76
86
85
Average
90.2
88.9
92.3
91.9
90.9
86.7
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
14.1
11
17
15
13
15
February
15.9
20
17
15
10
15
March
21.2
21
21
22
21
22
April
23.7
23
26
22
24
May
28.1
28
30
25
28
June
32.3
32
34
31
33
July
34.8
36
38
33
34
August
34.6
39
35
33
35
September
31.3
34
32
32
28
October
25.5
25
26
27
24
November
19.7
20
17
20
22
December
16.3
17
16
21
15
Average
23.9
17.4
25.7
25.6
24.2
24.5
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
3.7
1
6
1
4
6
February
5.4
8
6
1
1
5
March
10.5
12
11
8
10
13
April
12.9
13
15
13
12
May
18.2
19
19
17
18
June
22.3
21
23
22
22
July
23.9
25
26
23
24
August
24.0
26
24
24
23
September
20.8
22
20
20
19
October
14.2
15
13
16
13
November
9.0
12
8
8
10
December
6.6
6
9
11
4
Average
13.4
6.8
15.2
14.1
14.1
14.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.3
7
7
3
7
6
February
6.8
5
9
4
4
10
March
3.5
5
4
3
2
7
April
2.6
1
1
5
3
May
3.0
2
1
7
5
June
1.7
1
1
3
1
July
1.1
2
0
2
2
August
2.0
0
3
3
0
September
2.6
1
2
0
5
October
5.7
4
6
2
5
November
3.8
6
7
4
0
December
5.9
6
2
3
11
Average
3.8
5.6
3.3
2.7
3.3
4.3
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
7.8
8
9
8
8
7
February
8.5
9
8
9
8
9
March
8.9
8
9
9
9
9
April
8.1
8
11
9
8
May
7.2
6
9
7
8
June
7.4
7
7
7
8
July
6.9
7
7
6
7
August
6.6
7
6
7
7
September
5.9
6
5
6
6
October
7.1
7
6
8
7
November
7.6
7
6
8
8
December
7.3
7
7
9
8
Average
7.5
8.3
7.2
7.7
7.4
7.6
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
317°
238°
288°
283°
194°
February
213°
231°
285°
336°
280°
March
175°
194°
212°
184°
173°
April
123°
182°
152°
173°
May
148°
185°
151°
133°
June
162°
184°
183°
177°
July
192°
205°
154°
192°
August
181°
185°
141°
198°
September
159°
172°
125°
095°
October
175°
203°
160°
108°
November
172°
141°
186°
212°
December
216°
191°
196°
203°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.