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
91.7
87
86
93
91
95
February
93.4
96
94
96
90
94
March
97.2
97
99
98
97
96
April
97.3
99
99
99
97
May
95.0
97
94
97
96
June
93.4
94
96
96
92
July
87.9
88
90
87
88
August
86.5
87
87
90
85
September
85.2
83
85
82
92
October
88.1
90
91
87
87
November
94.6
96
96
95
94
December
93.2
94
89
95
91
Average
92.1
93.7
92.3
92.9
92.0
92.1
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
8.2
7
10
6
7
10
February
12.7
15
14
13
8
11
March
16.3
18
16
18
18
17
April
20.7
22
20
20
19
May
25.3
24
26
24
23
June
28.2
27
30
28
28
July
30.2
30
31
30
32
August
29.1
29
30
30
29
September
26.9
27
25
26
26
October
21.3
21
19
22
22
November
14.6
16
16
14
17
December
10.8
12
12
15
8
Average
19.5
13.0
20.9
20.7
20.1
20.2
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
-1.1
-2
1
-3
0
2
February
1.6
1
4
-1
-1
1
March
3.7
5
3
3
4
7
April
6.9
7
7
5
6
May
12.7
11
14
11
11
June
16.3
15
17
17
16
July
19.1
18
21
19
20
August
18.4
19
19
19
19
September
15.4
15
14
15
15
October
9.1
9
5
11
10
November
1.8
2
3
0
3
December
1.1
1
4
4
-1
Average
7.9
1.1
8.9
8.5
8.5
9.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
15.9
22
20
14
14
15
February
14.5
9
10
11
14
26
March
9.8
12
7
5
10
15
April
10.2
7
7
8
12
May
7.1
4
9
6
11
June
6.5
7
2
8
6
July
4.3
4
7
4
4
August
5.3
7
2
8
3
September
6.1
2
7
7
6
October
6.9
6
5
9
4
November
7.2
6
7
3
7
December
13.3
12
24
9
17
Average
9.2
14.3
6.9
7.1
8.0
10.0
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
3.8
4
4
4
4
4
February
4.3
4
5
5
4
4
March
4.8
4
5
5
4
5
April
4.4
4
5
4
5
May
3.4
3
3
3
4
June
2.8
3
3
3
3
July
2.3
3
2
3
2
August
2.1
2
3
2
2
September
2.2
2
2
2
2
October
2.6
3
3
3
3
November
3.3
3
3
3
3
December
2.9
3
2
4
3
Average
3.3
4.1
3.2
3.5
3.2
3.3
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
241°
212°
225°
259°
250°
February
218°
195°
230°
308°
224°
March
234°
246°
243°
201°
218°
April
243°
219°
262°
288°
May
310°
200°
314°
224°
June
301°
273°
195°
220°
July
238°
204°
235°
257°
August
210°
220°
212°
221°
September
346°
342°
222°
190°
October
278°
284°
208°
192°
November
194°
253°
200°
242°
December
218°
176°
194°
258°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.