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
90.1
92
83
93
86
92
February
86.5
99
86
90
83
86
March
93.8
90
97
93
94
88
April
95.5
93
94
98
97
May
95.2
95
96
96
98
June
90.3
66
97
93
97
July
90.0
76
92
89
93
August
93.6
98
92
94
95
September
96.0
98
98
93
97
October
92.9
97
95
90
93
November
91.0
92
90
98
89
December
84.2
91
81
82
86
Average
92.0
93.3
89.0
93.0
91.4
92.9
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
13.9
13
16
13
13
15
February
18.1
18
20
17
15
15
March
20.5
20
21
21
21
22
April
23.6
23
23
23
22
May
27.6
26
29
26
27
June
29.9
30
32
30
30
July
32.0
33
32
30
32
August
31.4
34
31
31
29
September
27.2
30
29
28
20
October
24.5
25
24
24
25
November
18.3
19
19
18
20
December
15.3
15
17
19
14
Average
22.8
17.0
24.3
24.0
23.2
22.6
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
1
5
0
3
5
February
6.4
5
8
4
3
5
March
8.2
8
8
6
8
13
April
10.2
11
10
9
10
May
15.4
15
17
14
13
June
18.7
19
20
20
18
July
21.0
21
22
19
22
August
20.0
21
20
22
14
September
15.7
18
17
18
9
October
12.1
12
9
13
14
November
5.1
6
7
4
8
December
3.9
3
9
8
1
Average
10.8
4.6
12.2
11.8
11.6
11.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.3
6
6
6
10
10
February
8.6
6
8
8
8
17
March
6.7
7
6
4
10
14
April
3.3
4
4
2
5
May
3.8
4
3
1
5
June
5.0
1
2
8
5
July
2.5
2
1
6
2
August
5.0
3
6
5
4
September
3.5
1
2
8
6
October
5.2
2
2
6
6
November
5.6
7
5
1
5
December
8.3
4
5
4
5
Average
5.4
6.4
3.8
3.8
5.6
6.4
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
4.7
5
5
5
4
4
February
4.9
5
5
5
5
4
March
4.8
5
3
6
4
5
April
4.8
4
6
5
4
May
4.0
3
5
4
4
June
3.2
2
3
3
4
July
2.6
1
3
3
3
August
2.2
1
3
2
3
September
3.0
3
4
3
4
October
3.7
4
4
4
4
November
3.8
4
4
4
4
December
4.3
5
5
4
4
Average
3.9
5.0
3.1
4.3
3.6
3.7
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
236°
243°
280°
268°
188°
February
208°
222°
202°
278°
270°
March
270°
222°
226°
188°
227°
April
261°
215°
254°
281°
May
325°
211°
171°
191°
June
255°
044°
173°
198°
July
275°
239°
231°
212°
August
321°
221°
139°
231°
September
086°
073°
119°
099°
October
250°
189°
215°
127°
November
086°
055°
318°
076°
December
235°
206°
223°
253°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.