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
76.7
75
92
10
87
92
February
85.7
97
93
82
77
86
March
89.1
86
94
77
86
93
April
91.3
88
89
98
93
May
88.8
95
81
95
94
June
92.6
70
95
97
98
July
94.3
84
91
97
97
August
96.1
99
99
97
90
September
94.7
95
91
97
97
October
93.1
95
92
94
86
November
94.1
94
85
99
94
December
83.8
76
72
89
97
Average
89.9
85.4
89.0
82.1
93.2
93.3
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
6.6
8
10
0
6
8
February
9.6
10
11
10
5
9
March
13.0
14
13
14
14
15
April
18.3
20
17
18
16
May
22.7
21
23
23
20
June
27.2
24
27
27
27
July
30.0
27
30
30
31
August
29.2
29
30
29
28
September
26.2
25
26
26
24
October
20.6
21
18
22
20
November
13.5
13
17
13
16
December
9.1
11
9
12
8
Average
17.9
10.7
18.8
18.6
18.8
18.5
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
0.8
2
4
-1
0
2
February
2.2
3
3
1
0
2
March
4.6
6
5
5
5
6
April
9.6
10
9
9
8
May
14.6
13
16
13
13
June
19.4
14
20
20
20
July
21.8
18
22
23
22
August
21.8
21
22
23
20
September
19.7
19
19
19
18
October
13.5
13
11
15
13
November
6.2
5
10
5
8
December
2.8
4
3
4
2
Average
10.5
3.3
10.7
11.5
11.5
11.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.0
19
11
1
8
4
February
12.3
8
14
21
17
10
March
10.0
15
8
17
8
6
April
7.4
13
12
4
10
May
9.0
7
14
9
5
June
5.8
9
9
4
2
July
5.1
5
8
2
3
August
5.2
3
2
6
11
September
7.1
11
10
4
7
October
7.2
5
15
3
13
November
7.5
10
13
4
8
December
10.6
10
24
2
7
Average
8.5
14.4
8.5
11.4
5.7
6.8
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
6.4
7
7
1
7
7
February
6.8
7
7
7
7
7
March
8.1
8
8
9
8
6
April
7.8
7
8
8
9
May
6.5
6
6
7
8
June
6.3
6
7
7
7
July
5.7
5
5
6
6
August
5.7
6
6
6
6
September
6.2
7
6
7
6
October
6.5
6
7
7
6
November
6.7
6
6
7
7
December
6.1
5
6
5
8
Average
6.6
7.1
6.3
6.3
6.7
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
311°
296°
329°
315°
308°
February
347°
227°
292°
329°
281°
March
333°
304°
268°
293°
102°
April
135°
307°
287°
300°
May
060°
092°
096°
112°
June
101°
146°
149°
126°
July
147°
146°
161°
142°
August
129°
144°
113°
139°
September
036°
028°
151°
056°
October
301°
030°
068°
353°
November
328°
167°
302°
208°
December
282°
329°
195°
279°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.