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
76.2
64
72
69
77
84
February
82.5
90
92
76
80
75
March
84.3
80
87
82
88
77
April
92.3
96
88
94
90
May
89.9
94
84
86
93
June
92.1
87
92
96
95
July
90.3
79
88
92
96
August
90.5
90
88
86
95
September
88.9
83
82
92
97
October
83.7
74
86
80
82
November
88.6
90
83
96
91
December
80.0
79
74
89
79
Average
86.1
77.2
85.1
83.5
88.1
88.5
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
3.7
4
7
1
3
6
February
7.5
10
11
7
2
6
March
11.2
14
11
13
14
13
April
16.8
19
16
17
14
May
22.2
22
24
21
20
June
25.8
25
27
27
26
July
28.5
28
29
28
31
August
27.1
27
27
28
29
September
24.3
24
23
24
24
October
18.3
18
17
20
17
November
10.6
12
13
10
14
December
6.3
9
6
10
4
Average
15.9
9.0
17.7
17.1
17.1
17.0
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
-4.7
-2
1
-7
-3
-1
February
-2.4
0
0
-4
-5
-2
March
1.2
4
1
2
2
4
April
6.2
7
6
6
4
May
12.1
10
13
11
10
June
16.2
15
16
17
16
July
19.1
19
19
19
20
August
18.0
17
18
19
19
September
14.8
15
15
14
14
October
9.2
9
6
12
9
November
2.1
2
4
2
5
December
-1.6
3
1
2
-1
Average
6.9
0.4
8.3
7.7
8.1
8.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
21.0
33
22
25
12
14
February
15.1
7
9
23
15
14
March
14.7
14
17
24
8
8
April
10.9
10
15
9
12
May
9.6
13
14
10
6
June
4.3
9
3
2
3
July
5.0
7
6
6
2
August
3.6
4
5
6
2
September
6.2
8
8
5
3
October
10.2
14
12
9
7
November
10.8
10
16
5
8
December
14.8
16
11
10
14
Average
10.9
18.4
11.2
12.9
7.7
7.2
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
7.7
8
7
8
7
7
February
8.3
7
9
9
8
7
March
8.3
8
9
9
8
8
April
7.8
8
8
8
8
May
6.6
6
6
5
8
June
6.4
6
6
7
6
July
5.6
6
6
6
5
August
5.1
5
5
5
5
September
5.3
4
6
7
5
October
6.5
6
7
6
6
November
7.4
8
8
7
8
December
7.3
7
7
7
8
Average
6.9
7.6
6.5
6.8
6.6
6.8
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
242°
235°
247°
259°
245°
February
245°
241°
243°
268°
243°
March
253°
255°
252°
253°
226°
April
236°
240°
262°
277°
May
234°
191°
270°
204°
June
220°
249°
206°
226°
July
217°
227°
238°
240°
August
237°
212°
208°
214°
September
184°
233°
217°
188°
October
240°
223°
211°
223°
November
234°
227°
239°
231°
December
223°
231°
218°
231°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.