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
85.1
87
85
91
83
85
February
81.1
86
89
80
72
82
March
89.4
83
91
85
85
86
April
92.8
84
95
91
98
May
94.4
94
92
88
97
June
95.3
94
98
93
96
July
95.5
96
96
87
94
August
94.7
98
95
97
88
September
94.8
95
97
93
86
October
93.7
94
96
97
91
November
91.3
91
88
97
91
December
82.5
94
71
77
88
Average
90.6
85.1
92.1
90.9
89.0
90.2
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
16.7
16
20
15
16
18
February
20.4
20
23
19
17
19
March
22.7
23
24
23
22
25
April
24.7
25
25
23
25
May
28.5
29
28
26
28
June
30.8
32
32
30
31
July
31.7
33
30
30
31
August
31.9
36
30
31
32
September
30.8
33
29
29
29
October
26.8
28
26
26
27
November
21.0
20
22
21
22
December
18.2
17
20
22
17
Average
24.6
19.3
26.5
24.8
24.6
25.2
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
5.2
3
6
4
7
8
February
9.3
7
11
7
7
8
March
11.0
11
12
11
12
15
April
12.6
14
13
11
14
May
16.8
17
19
14
15
June
21.3
21
23
20
21
July
21.5
23
23
15
23
August
22.5
24
23
23
22
September
20.5
22
20
20
20
October
15.4
14
12
16
17
November
9.3
11
11
7
12
December
8.1
7
10
12
5
Average
13.6
6.8
15.1
14.3
13.8
14.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.0
9
6
8
5
8
February
9.0
4
7
3
5
8
March
6.1
5
4
4
7
3
April
7.8
3
0
3
2
May
3.2
2
4
1
3
June
5.1
0
1
6
5
July
4.3
3
7
4
4
August
5.9
1
11
5
3
September
4.4
3
3
5
9
October
3.5
3
1
3
3
November
3.2
8
4
0
1
December
5.2
3
3
3
3
Average
5.5
6.1
3.0
4.0
4.0
4.1
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
6.9
7
6
7
7
7
February
7.7
7
8
9
8
8
March
7.9
7
8
8
9
8
April
7.8
7
9
7
7
May
6.3
5
7
7
7
June
5.5
6
5
6
6
July
4.6
4
4
4
5
August
4.7
5
4
5
5
September
5.1
4
7
4
6
October
5.7
6
5
5
6
November
6.1
8
6
5
7
December
6.2
6
5
6
6
Average
6.3
7.0
5.9
6.3
5.9
6.4
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
157°
234°
351°
305°
115°
February
189°
202°
152°
340°
216°
March
147°
198°
177°
165°
189°
April
182°
179°
161°
279°
May
176°
183°
162°
183°
June
220°
234°
184°
176°
July
261°
212°
217°
238°
August
245°
204°
174°
190°
September
119°
009°
138°
094°
October
035°
127°
194°
052°
November
062°
016°
012°
033°
December
007°
153°
195°
008°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.