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
86.8
87
88
91
86
89
February
87.0
94
89
89
76
88
March
90.2
86
92
92
88
89
April
93.0
96
97
96
93
May
89.9
96
86
96
86
June
92.2
91
98
88
92
July
95.1
94
96
98
96
August
90.4
90
88
September
82.0
94
0
87
October
73.0
95
86
97
73
November
89.3
96
89
85
91
December
86.1
87
84
90
86
Average
88.8
88.9
92.3
91.8
89.4
88.3
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
9.4
10
12
8
9
11
February
13.5
14
16
13
9
13
March
16.4
19
16
18
17
19
April
21.9
23
22
22
21
May
25.4
23
26
25
22
June
29.1
27
30
30
29
July
31.9
31
32
32
34
August
30.5
29
30
September
27.4
26
20
25
October
22.5
23
19
20
22
November
15.5
16
17
15
19
December
11.5
13
9
16
11
Average
19.9
13.9
21.2
19.5
19.0
21.3
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
-1.1
-1
2
-3
-2
1
February
1.7
1
3
0
0
2
March
3.5
5
3
4
2
7
April
7.7
7
7
6
7
May
12.4
11
14
10
6
June
15.0
14
18
10
11
July
16.2
20
21
14
7
August
15.8
19
4
September
14.7
15
14
9
October
9.1
8
8
10
7
November
2.1
1
4
1
4
December
0.4
1
0
2
0
Average
6.9
1.8
8.6
7.3
4.6
5.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
September
0.0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
6
February
6.7
7
9
8
6
7
March
7.6
7
8
9
8
9
April
7.3
8
8
8
8
May
6.7
8
8
7
8
June
5.5
7
6
7
6
July
4.7
5
7
7
5
August
4.0
5
4
September
4.7
5
8
5
October
4.9
6
7
8
5
November
5.8
7
7
7
6
December
5.5
6
6
7
7
Average
6.1
6.9
6.6
7.4
7.0
6.3
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
192°
195°
175°
218°
272°
February
166°
193°
182°
182°
233°
March
143°
188°
189°
138°
166°
April
161°
184°
202°
211°
May
105°
100°
142°
130°
June
126°
142°
158°
147°
July
171°
158°
175°
159°
August
148°
159°
September
086°
302°
078°
October
179°
094°
196°
135°
November
141°
142°
184°
196°
December
162°
151°
163°
201°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.