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
79.7
91
95
96
90
85
February
83.8
95
98
87
79
91
March
95.3
93
99
96
96
92
April
95.2
100
97
92
94
May
95.9
94
98
96
June
95.1
98
96
95
July
94.8
92
95
92
August
91.7
88
97
September
64.6
99
20
96
October
74.4
98
82
93
November
74.7
0
91
92
91
December
74.7
96
93
92
92
Average
87.8
92.7
97.4
94.7
85.0
92.8
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
14.0
14
18
15
15
16
February
17.8
20
20
17
14
16
March
22.3
22
24
22
22
24
April
24.5
24
26
24
24
May
27.8
32
27
23
June
31.3
33
32
31
July
31.4
27
32
32
August
28.2
33
33
September
25.4
31
30
30
October
21.9
26
28
26
November
16.4
3
21
21
23
December
14.7
17
20
22
16
Average
22.0
18.4
20.4
24.0
25.2
24.4
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
4.7
4
9
2
5
7
February
7.7
8
9
4
5
6
March
11.2
12
12
9
12
13
April
12.3
16
14
13
6
May
15.5
19
18
8
June
22.0
22
22
22
July
21.5
24
23
24
August
14.9
23
22
September
13.0
18
19
21
October
10.2
12
17
15
November
5.9
3
8
8
9
December
6.5
6
11
12
5
Average
11.2
7.9
10.0
11.5
15.1
13.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.4
5
9
3
4
9
February
5.2
4
5
4
9
9
March
3.6
4
4
3
2
4
April
2.3
7
2
4
1
May
2.6
0
7
2
June
3.6
2
3
5
July
3.7
17
3
4
August
3.4
1
2
September
1.6
0
1
2
October
2.7
1
1
5
November
3.9
0
4
3
5
December
5.5
8
7
3
5
Average
3.9
4.2
6.2
2.4
3.3
4.0
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
6.3
8
7
8
7
6
February
7.3
8
8
8
7
8
March
7.4
7
8
7
8
8
April
7.4
8
9
7
7
May
6.2
7
7
7
June
5.2
4
6
5
July
4.1
5
4
4
August
3.5
4
4
September
4.1
6
5
6
October
4.5
6
5
5
November
4.5
0
6
5
5
December
5.1
6
6
8
6
Average
6.0
7.5
7.4
6.7
5.9
5.8
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
007°
201°
315°
255°
076°
February
206°
192°
002°
009°
231°
March
126°
143°
189°
141°
144°
April
080°
156°
120°
036°
May
167°
118°
137°
June
124°
139°
153°
July
147°
186°
176°
August
075°
054°
September
020°
065°
048°
October
119°
154°
022°
November
360°
028°
023°
042°
December
128°
196°
187°
166°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.