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
74.0
63
79
88
77
63
February
80.6
93
89
82
65
81
March
86.0
92
82
91
88
76
April
91.5
88
97
92
90
91
May
85.2
90
80
86
83
June
95.4
95
100
91
99
July
96.2
98
94
97
98
August
93.8
97
94
95
96
September
94.4
96
94
98
88
October
85.4
89
95
86
74
November
90.9
95
90
98
91
December
83.8
90
63
92
87
Average
88.3
84.6
91.7
89.6
89.2
86.2
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
6.3
5
10
8
7
8
February
10.0
16
13
10
4
10
March
14.8
18
14
16
18
17
April
18.9
22
21
20
21
19
May
23.1
25
25
24
22
June
28.1
30
31
30
30
July
29.9
32
35
30
32
August
28.4
31
31
31
30
September
26.6
28
28
29
26
October
19.1
21
22
21
20
November
13.1
16
14
15
17
December
10.0
12
9
17
10
Average
18.5
15.1
21.0
21.0
20.6
20.1
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
-2.5
-5
1
-4
0
0
February
0.7
4
2
-2
-5
0
March
5.0
7
4
4
5
7
April
8.7
10
8
8
8
8
May
13.9
14
14
12
12
June
18.3
18
19
19
18
July
20.7
20
23
20
21
August
19.6
20
19
21
19
September
16.7
16
16
17
16
October
9.9
11
9
12
8
November
3.4
4
3
4
3
December
2.0
3
3
5
1
Average
9.1
4.0
10.0
9.6
9.8
9.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.7
17
7
9
9
12
February
7.2
5
4
8
11
9
March
6.3
5
8
7
3
8
April
5.1
5
1
6
6
5
May
7.4
5
7
11
8
June
2.1
2
2
2
1
July
1.9
1
2
2
2
August
3.0
2
1
1
0
September
1.4
1
2
0
2
October
7.6
4
2
10
13
November
3.8
5
1
1
6
December
3.8
2
3
4
7
Average
4.8
7.7
3.3
4.0
4.7
5.7
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
6.3
5
6
7
6
7
February
6.7
6
6
8
6
7
March
7.4
7
8
8
8
7
April
7.2
8
6
8
7
7
May
5.8
4
7
6
7
June
4.1
3
4
4
6
July
4.2
3
5
3
5
August
4.1
3
4
5
5
September
4.6
3
5
5
6
October
6.0
5
6
6
7
November
5.8
4
6
6
7
December
6.1
6
6
7
7
Average
5.8
6.4
4.6
6.0
5.6
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
282°
243°
292°
293°
201°
February
233°
236°
271°
356°
306°
March
224°
205°
206°
157°
153°
April
220°
200°
172°
255°
259°
May
137°
154°
128°
107°
June
267°
158°
154°
178°
July
236°
203°
234°
165°
August
265°
142°
151°
048°
September
137°
131°
153°
147°
October
243°
254°
247°
130°
November
177°
199°
204°
167°
December
240°
154°
200°
260°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.