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
88.5
85
90
96
87
78
February
84.8
91
88
94
79
92
March
92.1
97
90
96
97
78
April
93.4
97
98
92
89
May
94.0
97
94
81
93
June
96.5
96
100
96
97
July
98.8
100
99
100
98
August
96.9
98
95
96
99
September
94.6
97
99
99
88
October
89.7
92
97
95
83
November
89.9
92
82
90
88
December
84.5
89
77
89
79
Average
92.1
91.3
94.1
94.8
91.6
89.0
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
12.8
10
16
14
12
14
February
14.7
19
16
14
8
14
March
20.2
20
21
20
21
21
April
22.8
23
25
21
22
May
27.3
29
29
24
27
June
31.8
34
33
31
32
July
33.2
25
38
34
34
August
33.9
39
34
32
34
September
30.7
34
32
32
28
October
24.3
25
25
26
23
November
18.3
19
16
19
21
December
14.8
15
14
21
13
Average
22.8
16.2
24.6
24.9
22.9
23.4
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
0.8
-1
2
-2
2
4
February
2.6
6
3
-1
-2
3
March
8.0
9
7
5
8
11
April
10.8
10
12
11
10
May
16.4
16
18
16
16
June
20.9
21
22
21
20
July
21.2
14
24
23
24
August
22.3
24
23
21
22
September
19.1
21
18
18
17
October
11.9
13
12
13
11
November
6.0
7
6
7
8
December
3.7
4
6
7
2
Average
11.0
4.5
11.9
12.1
11.5
12.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.2
4
6
1
5
7
February
7.1
6
8
5
7
6
March
2.8
0
3
3
3
6
April
3.9
3
2
7
2
May
3.2
1
2
4
7
June
2.3
0
1
0
4
July
2.0
4
2
0
2
August
3.1
1
4
5
2
September
3.4
2
0
1
4
October
6.1
4
6
3
6
November
3.6
4
7
4
2
December
5.3
1
4
3
10
Average
3.8
3.2
2.8
2.8
3.5
4.6
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
8.6
8
9
9
9
8
February
9.1
9
9
9
9
10
March
10.0
10
10
10
11
9
April
9.8
9
12
9
9
May
7.5
6
10
7
9
June
6.9
7
7
7
9
July
6.8
8
7
6
8
August
6.9
8
7
7
7
September
6.6
7
6
6
6
October
7.9
9
7
8
9
November
8.0
7
8
7
9
December
7.8
8
8
8
7
Average
8.1
8.9
8.0
8.4
7.9
8.2
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
331°
241°
316°
310°
193°
February
223°
241°
285°
360°
297°
March
170°
180°
207°
180°
162°
April
131°
167°
158°
157°
May
145°
168°
135°
137°
June
126°
156°
164°
175°
July
173°
172°
155°
160°
August
141°
150°
165°
141°
September
151°
154°
152°
076°
October
155°
170°
192°
125°
November
170°
151°
173°
169°
December
224°
225°
188°
298°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.