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
88.9
91
84
91
81
95
February
85.4
93
80
89
70
91
March
91.5
86
92
88
88
92
April
93.6
90
85
96
99
97
May
91.2
88
88
98
85
June
94.7
94
98
92
92
July
94.5
94
89
94
97
August
93.5
93
96
92
91
September
92.4
91
93
98
85
October
92.8
94
92
91
89
November
90.8
92
92
98
88
December
90.2
90
93
88
88
Average
91.7
89.8
89.8
92.0
91.5
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
13.1
14
16
11
11
16
February
17.0
16
19
17
12
16
March
18.8
21
19
21
20
20
April
23.8
25
24
24
24
23
May
27.2
25
28
27
25
June
30.4
29
32
29
29
July
32.5
33
33
31
34
August
31.3
32
31
31
31
September
28.8
28
29
29
27
October
24.5
24
23
25
25
November
18.2
19
20
17
21
December
15.0
17
14
19
13
Average
22.8
18.8
23.7
23.8
23.1
23.3
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
2.6
3
5
0
3
5
February
5.4
5
7
4
3
6
March
7.2
9
7
8
8
10
April
11.4
12
12
11
11
10
May
15.9
14
18
14
15
June
20.0
18
20
20
20
July
22.3
23
23
22
23
August
21.6
22
22
22
23
September
19.0
18
17
18
19
October
12.9
12
11
13
14
November
6.5
6
9
5
9
December
4.4
5
4
7
2
Average
11.8
7.1
12.4
12.4
12.1
13.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.8
10
9
11
10
4
February
9.9
10
16
8
17
7
March
7.3
13
7
12
6
6
April
6.6
9
15
5
1
6
May
5.7
11
5
4
8
June
4.9
7
3
6
8
July
3.7
6
5
4
2
August
5.0
9
8
4
3
September
5.7
10
8
3
10
October
4.1
6
3
3
5
November
6.8
8
9
5
6
December
9.4
9
9
8
9
Average
6.6
10.3
9.1
6.7
5.3
6.0
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
7.1
8
7
7
6
8
February
7.4
8
7
7
8
8
March
8.1
8
7
9
8
8
April
8.1
8
8
8
7
9
May
7.4
8
7
7
8
June
6.4
7
6
6
7
July
5.9
5
6
6
6
August
5.3
6
5
5
5
September
5.9
6
6
6
6
October
6.0
6
6
7
6
November
6.1
5
6
7
6
December
6.2
6
5
6
7
Average
6.8
8.0
6.5
6.6
6.3
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
258°
219°
313°
306°
281°
February
301°
217°
259°
324°
256°
March
324°
276°
219°
321°
253°
April
267°
246°
220°
273°
265°
May
021°
212°
287°
325°
June
276°
332°
221°
229°
July
243°
171°
215°
228°
August
276°
166°
193°
212°
September
353°
023°
317°
010°
October
320°
301°
289°
026°
November
014°
316°
326°
286°
December
292°
300°
256°
271°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.