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
83.9
77
82
89
87
88
February
84.4
94
97
88
79
74
March
91.9
89
93
99
97
86
April
94.6
94
97
94
94
94
May
93.3
95
97
94
91
June
94.6
96
97
93
94
July
93.6
95
93
91
95
August
94.2
93
96
95
93
September
93.8
98
97
94
94
October
90.5
89
97
89
84
November
89.9
95
92
96
95
December
86.9
90
70
89
88
Average
91.1
88.7
93.6
93.5
91.7
90.0
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
6.1
4
10
4
5
8
February
10.3
13
13
9
4
8
March
14.2
16
14
16
16
15
April
19.1
21
20
18
18
17
May
24.4
23
25
23
22
June
28.5
27
30
29
29
July
30.0
30
31
29
31
August
28.8
28
29
30
28
September
26.8
27
26
26
25
October
20.5
20
20
22
19
November
12.8
15
14
12
16
December
9.5
10
9
14
8
Average
18.5
13.4
19.8
19.6
19.0
18.9
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
-2.1
-3
2
-6
-2
1
February
0.3
1
2
-2
-4
0
March
3.3
5
3
3
4
6
April
7.5
10
7
7
7
6
May
13.3
12
14
11
12
June
17.0
16
17
18
17
July
19.8
20
21
20
19
August
18.5
18
19
19
19
September
15.1
14
14
15
15
October
9.0
10
6
12
9
November
2.0
3
3
0
4
December
0.5
2
1
3
-2
Average
8.0
3.0
9.1
8.4
8.6
8.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.8
13
5
10
8
13
February
8.1
3
2
10
9
13
March
5.6
5
4
2
5
9
April
5.8
4
5
7
9
8
May
5.3
3
3
4
6
June
4.2
6
1
5
3
July
2.7
3
2
4
2
August
3.0
2
2
7
3
September
4.0
3
1
5
2
October
5.2
4
4
6
6
November
5.5
2
4
6
6
December
5.9
4
6
3
4
Average
5.4
5.7
3.4
3.9
5.7
5.8
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
6.6
7
7
5
6
7
February
7.0
7
9
6
6
7
March
7.7
8
8
7
8
8
April
7.0
8
7
6
7
6
May
6.0
6
6
6
6
June
5.5
5
5
6
6
July
4.5
5
5
4
4
August
4.3
5
4
4
4
September
4.3
4
5
4
5
October
5.5
6
6
5
5
November
6.1
6
6
6
6
December
6.1
6
6
8
6
Average
6.0
7.6
6.0
5.5
5.7
5.7
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
252°
230°
267°
241°
218°
February
240°
221°
219°
290°
248°
March
237°
223°
227°
199°
224°
April
232°
226°
216°
233°
249°
May
057°
196°
189°
224°
June
294°
251°
209°
227°
July
235°
241°
241°
238°
August
254°
216°
200°
256°
September
109°
288°
221°
233°
October
233°
221°
218°
214°
November
230°
228°
223°
227°
December
231°
213°
211°
229°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.