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
81.1
71
82
89
80
81
February
86.5
97
99
92
88
75
March
91.4
90
95
97
97
87
April
94.5
100
89
96
94
May
93.4
92
94
95
97
June
94.8
89
99
94
97
July
94.7
93
94
95
97
August
94.7
97
91
96
95
September
94.0
94
93
91
94
October
91.4
94
99
87
84
November
90.5
94
93
93
92
December
88.8
87
86
89
92
Average
91.4
86.8
93.5
93.3
92.4
90.8
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
3.1
4
4
1
3
7
February
7.3
11
12
5
2
5
March
11.7
15
11
11
15
14
April
16.5
19
12
17
16
May
22.7
21
24
21
21
June
27.1
27
28
28
29
July
29.3
29
29
28
32
August
28.2
28
28
29
28
September
25.9
26
25
26
26
October
19.3
19
19
21
18
November
11.0
13
12
11
15
December
7.1
10
6
11
6
Average
16.9
9.7
19.1
17.6
17.8
17.9
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
-4.3
-3
-1
-6
-2
0
February
-2.7
1
1
-3
-5
-2
March
2.1
4
1
3
3
5
April
6.3
6
6
7
6
May
12.3
10
14
10
11
June
15.5
16
14
13
17
July
17.5
19
12
16
20
August
17.6
18
14
18
18
September
14.7
14
12
15
14
October
9.0
9
5
12
9
November
2.1
3
3
1
5
December
-1.9
2
1
3
-1
Average
7.2
0.6
8.9
6.7
7.6
8.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.4
29
19
10
10
19
February
10.3
3
2
15
13
16
March
8.5
7
7
8
2
10
April
8.4
4
19
7
9
May
8.3
5
9
8
12
June
4.9
3
3
6
3
July
4.9
3
8
4
5
August
3.9
2
4
5
4
September
5.1
4
4
7
3
October
5.9
7
2
7
6
November
7.9
7
6
6
9
December
8.6
13
6
9
6
Average
8.0
12.2
5.2
6.9
6.7
8.2
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
7.4
9
5
8
6
7
February
7.6
8
9
6
7
7
March
8.9
9
9
11
8
9
April
8.0
7
9
8
8
May
6.8
6
7
6
7
June
6.4
7
5
7
6
July
4.9
5
5
5
5
August
4.9
5
5
5
5
September
5.6
5
6
6
6
October
6.5
7
8
6
6
November
7.2
8
8
7
8
December
7.0
7
6
7
7
Average
6.9
8.7
6.5
6.7
6.4
6.6
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
243°
144°
251°
201°
230°
February
239°
234°
214°
330°
262°
March
238°
255°
249°
226°
249°
April
237°
234°
251°
265°
May
062°
183°
267°
228°
June
359°
254°
216°
242°
July
243°
236°
260°
251°
August
259°
192°
191°
262°
September
066°
261°
250°
170°
October
254°
236°
222°
201°
November
224°
224°
232°
236°
December
219°
233°
209°
237°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.