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
71.6
74
78
6
89
83
February
62.8
85
79
2
59
85
March
84.5
79
80
87
92
79
April
87.7
83
93
83
84
May
88.2
83
95
79
96
June
93.0
94
99
92
92
July
95.1
100
99
85
96
August
95.1
99
88
95
98
September
92.3
97
95
97
93
October
86.4
83
97
92
91
November
83.5
74
76
91
88
December
82.8
88
71
73
92
Average
85.0
79.0
86.5
77.8
85.9
89.9
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
17.1
16
21
17
18
20
February
18.8
22
22
17
15
19
March
23.8
24
25
24
24
26
April
26.4
26
29
26
27
May
29.9
29
34
29
31
June
33.7
35
37
33
33
July
35.6
38
38
33
36
August
35.3
40
36
34
37
September
32.2
37
31
34
31
October
26.3
29
30
29
28
November
22.0
21
21
22
25
December
19.6
20
20
22
20
Average
25.9
20.5
28.5
28.2
26.7
27.6
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
4.3
4
0
4
5
8
February
6.0
9
0
3
3
6
March
12.1
12
14
7
11
15
April
14.1
11
17
14
14
May
18.7
19
21
18
19
June
22.5
23
23
23
21
July
23.1
25
24
23
24
August
22.7
24
24
23
23
September
17.7
23
1
20
20
October
11.1
16
0
16
14
November
8.5
11
0
10
11
December
5.6
6
0
10
4
Average
13.2
8.4
14.3
10.5
14.7
14.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.1
3
0
0
3
3
February
4.1
1
3
5
4
6
March
0.8
1
1
1
0
2
April
0.9
2
0
1
2
May
0.9
1
0
1
1
June
0.5
0
0
0
1
July
0.5
0
0
0
2
August
1.3
0
1
0
0
September
0.9
0
0
0
1
October
2.4
3
4
0
0
November
3.9
1
10
1
3
December
3.9
2
4
2
1
Average
2.0
1.6
1.0
1.9
0.8
1.6
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
8.8
9
9
9
8
9
February
9.7
10
11
10
8
10
March
10.1
9
10
12
11
9
April
10.4
10
12
10
9
May
9.0
6
11
9
9
June
8.4
8
9
8
8
July
8.1
8
9
7
8
August
8.1
9
8
8
8
September
7.4
7
6
7
10
October
7.9
8
8
8
8
November
7.7
8
9
5
8
December
8.0
7
9
6
8
Average
8.7
9.4
8.4
9.2
8.0
8.6
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
360°
331°
351°
341°
157°
February
241°
254°
360°
019°
340°
March
143°
145°
199°
119°
130°
April
092°
151°
113°
086°
May
135°
166°
120°
138°
June
178°
166°
151°
148°
July
185°
177°
158°
164°
August
162°
162°
165°
167°
September
151°
107°
090°
024°
October
116°
149°
155°
061°
November
017°
054°
139°
089°
December
022°
167°
190°
284°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.