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
81.7
70
77
91
85
79
February
76.7
40
88
87
75
84
March
93.9
93
95
94
96
86
April
94.6
97
93
96
97
95
May
97.3
98
97
99
97
June
95.5
95
97
96
96
July
96.3
95
94
96
100
August
94.9
97
92
97
94
September
95.8
100
93
97
93
October
91.5
93
94
97
81
November
91.0
96
91
95
95
December
82.6
94
65
83
92
Average
90.4
76.4
93.5
92.2
93.3
91.3
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
10.1
6
13
10
10
12
February
13.2
16
15
13
6
12
March
18.0
19
17
18
20
18
April
21.8
23
22
22
21
21
May
27.4
28
28
26
26
June
31.0
31
32
31
31
July
32.5
32
34
32
33
August
31.2
32
31
30
31
September
30.3
29
32
30
28
October
23.4
24
24
25
22
November
16.2
17
16
16
19
December
12.9
13
12
18
12
Average
21.7
15.7
22.6
23.2
22.2
22.1
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
1.5
-2
5
-1
2
4
February
3.7
5
6
1
-2
4
March
8.1
8
8
7
9
10
April
11.6
13
12
11
11
12
May
17.1
16
18
16
16
June
21.0
20
21
22
21
July
23.0
22
24
23
24
August
21.2
21
23
20
22
September
18.6
18
18
18
17
October
12.5
13
10
15
11
November
5.4
6
6
4
8
December
3.8
3
6
8
2
Average
11.7
5.9
12.3
12.3
12.1
12.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.2
18
14
13
8
17
February
10.9
12
14
11
15
12
March
9.1
6
12
21
4
10
April
7.0
7
9
6
4
5
May
5.3
3
6
6
6
June
4.0
4
5
6
3
July
3.0
3
4
4
1
August
3.5
1
5
4
4
September
5.5
3
2
15
9
October
9.8
9
5
11
8
November
6.8
3
7
5
6
December
11.2
4
28
9
12
Average
7.3
10.4
6.4
8.4
7.2
7.4
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
7.8
7
8
9
8
7
February
8.7
9
9
9
9
9
March
8.6
8
9
8
8
8
April
8.4
9
8
9
7
8
May
7.6
7
8
8
8
June
6.3
5
6
7
7
July
5.2
5
6
5
5
August
5.1
5
5
6
5
September
5.4
5
5
6
6
October
6.9
7
8
6
7
November
7.0
7
6
7
7
December
6.8
7
4
8
7
Average
7.1
8.3
6.7
7.0
6.9
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
028°
213°
019°
287°
145°
February
175°
205°
195°
027°
299°
March
179°
163°
190°
152°
171°
April
182°
145°
177°
198°
165°
May
123°
169°
145°
155°
June
078°
097°
173°
166°
July
205°
193°
182°
196°
August
062°
141°
142°
050°
September
096°
041°
135°
067°
October
159°
158°
187°
083°
November
102°
120°
180°
170°
December
196°
135°
188°
180°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.