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
84.7
87
81
96
84
74
February
78.6
92
80
100
75
76
March
89.4
91
91
93
91
82
April
92.6
92
94
86
92
May
94.6
94
95
93
97
June
87.3
98
99
95
75
July
68.9
99
97
55
43
August
66.9
99
74
0
31
September
86.6
98
99
55
82
October
90.0
91
95
93
86
November
88.1
81
89
88
92
December
85.0
90
78
84
91
Average
84.6
90.1
91.9
92.1
73.3
75.9
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
16.8
16
19
17
16
17
February
19.4
21
20
19
15
19
March
22.5
23
24
22
23
25
April
24.9
24
26
24
25
May
28.7
29
31
27
28
June
31.7
34
34
31
31
July
32.0
35
33
32
28
August
32.6
38
32
32
31
September
30.9
34
31
30
30
October
26.6
27
26
28
26
November
20.8
21
20
20
23
December
18.5
19
20
23
17
Average
24.9
19.6
27.2
26.8
25.2
24.8
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
5.9
4
9
5
6
8
February
9.3
9
10
19
5
7
March
12.0
12
13
9
11
16
April
13.9
15
15
13
14
May
18.4
19
20
18
18
June
21.9
22
22
23
21
July
22.3
23
23
23
20
August
22.5
24
23
23
20
September
20.6
21
20
20
21
October
15.3
15
13
17
15
November
9.2
9
10
8
11
December
8.0
8
12
13
6
Average
14.3
8.1
15.9
15.8
14.9
14.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.0
7
5
2
5
7
February
5.8
5
7
0
5
7
March
2.7
3
1
3
3
4
April
2.5
5
3
3
2
May
3.1
5
2
6
3
June
3.8
1
2
4
3
July
1.7
3
4
2
0
August
3.1
1
4
0
0
September
4.9
3
2
7
4
October
4.3
2
2
3
7
November
4.8
7
8
4
4
December
5.2
6
7
2
7
Average
3.9
4.9
3.4
3.4
3.5
3.8
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
5.8
6
7
6
6
5
February
6.0
7
7
3
6
6
March
6.2
6
7
7
7
6
April
6.4
6
8
6
5
May
5.6
5
6
6
5
June
4.4
5
4
5
4
July
3.4
4
4
3
4
August
3.4
5
4
3
3
September
3.3
4
3
4
4
October
4.5
6
4
5
4
November
4.1
4
4
4
4
December
5.0
5
5
6
6
Average
4.9
6.2
5.1
5.0
4.8
4.7
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
348°
173°
334°
260°
126°
February
207°
177°
180°
082°
225°
March
131°
147°
189°
139°
154°
April
137°
154°
141°
109°
May
145°
166°
130°
151°
June
190°
185°
146°
146°
July
188°
178°
181°
162°
August
181°
166°
151°
315°
September
120°
021°
067°
019°
October
093°
148°
149°
022°
November
066°
050°
065°
032°
December
093°
145°
174°
133°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.