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
78.5
77
66
87
75
81
February
80.3
92
78
72
71
81
March
86.1
77
83
88
85
87
April
91.3
92
90
94
96
94
May
89.7
93
87
95
84
June
91.9
83
99
91
94
July
92.5
94
88
92
94
August
89.5
86
84
95
89
September
88.1
91
85
90
82
October
87.3
97
87
85
80
November
87.4
93
74
98
86
December
80.1
75
62
89
85
Average
87.1
84.5
86.0
85.0
88.9
86.7
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
10.1
10
13
9
9
11
February
14.2
15
16
14
11
12
March
16.8
19
17
19
17
19
April
21.4
22
22
22
21
20
May
25.1
24
27
25
22
June
28.4
27
30
29
28
July
30.9
31
31
31
31
August
29.4
30
29
31
29
September
27.2
27
26
28
25
October
22.2
23
20
23
22
November
15.6
17
17
16
18
December
11.9
13
10
17
11
Average
20.6
16.4
21.6
21.5
21.4
20.6
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
1.0
1
4
-1
0
3
February
3.6
3
6
2
1
3
March
5.8
7
6
7
6
9
April
9.7
11
9
9
9
9
May
14.3
13
15
13
12
June
18.2
16
19
19
18
July
20.5
21
21
20
21
August
19.7
20
20
20
21
September
17.1
17
16
16
16
October
11.3
11
9
13
11
November
4.5
4
7
3
7
December
2.5
3
3
5
1
Average
10.1
5.5
10.7
10.7
10.6
10.8
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
15
6
6
7
8
February
8.3
4
8
15
10
13
March
7.6
11
8
9
7
4
April
7.9
7
16
6
4
6
May
5.5
4
6
4
9
June
4.0
9
1
2
6
July
2.3
2
4
2
1
August
3.1
4
1
5
3
September
5.1
3
8
2
8
October
4.9
0
3
4
7
November
6.6
5
16
2
3
December
9.1
15
12
3
6
Average
6.1
9.1
6.7
6.7
4.1
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
4.8
5
5
5
4
5
February
5.2
5
5
5
6
5
March
5.9
5
5
7
5
6
April
5.9
6
5
6
6
6
May
5.2
6
5
5
5
June
4.5
5
4
4
5
July
3.8
4
4
4
4
August
3.5
4
3
3
4
September
4.1
4
4
4
5
October
3.9
4
4
5
3
November
4.1
4
5
5
4
December
3.9
4
3
4
4
Average
4.7
5.4
4.5
4.5
4.6
4.6
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
295°
274°
295°
302°
291°
February
249°
238°
250°
332°
257°
March
327°
261°
239°
351°
217°
April
240°
240°
246°
262°
283°
May
008°
210°
271°
328°
June
287°
288°
228°
256°
July
264°
219°
239°
293°
August
264°
255°
312°
238°
September
360°
007°
295°
037°
October
294°
332°
276°
294°
November
335°
302°
286°
297°
December
303°
034°
207°
292°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.