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
90.8
78
95
97
90
86
February
92.9
98
98
90
83
96
March
93.8
96
96
96
93
86
April
95.7
95
98
96
94
May
93.6
95
95
89
95
June
92.4
97
99
95
77
July
98.6
98
100
98
98
August
98.4
99
99
99
97
September
97.6
99
99
99
93
October
94.0
95
99
97
87
November
94.3
97
91
99
92
December
90.9
86
85
99
88
Average
94.5
93.7
96.7
96.2
94.8
90.8
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
11.1
7
13
12
9
13
February
12.3
18
14
12
5
13
March
19.1
21
18
19
20
20
April
22.1
22
25
21
21
May
25.9
27
28
24
26
June
31.8
31
33
30
33
July
34.2
34
38
32
33
August
34.2
36
35
33
33
September
31.0
32
32
33
27
October
23.3
24
25
25
22
November
16.9
18
14
18
19
December
13.9
11
13
19
12
Average
22.6
16.5
24.5
24.0
22.4
22.7
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
-1.7
-1
1
-3
0
1
February
0.0
5
2
-2
-5
1
March
6.5
7
5
5
8
9
April
9.6
9
11
9
10
May
15.1
16
17
12
15
June
21.0
19
23
21
21
July
22.9
22
25
22
23
August
22.4
22
23
23
21
September
19.0
19
19
20
16
October
11.3
12
12
13
10
November
5.3
6
4
6
7
December
2.8
10
3
5
0
Average
10.9
4.5
12.0
11.6
11.2
11.4
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
0
0
September
0.0
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
10.2
8
11
10
10
11
February
11.2
12
11
12
10
11
March
12.0
12
12
13
13
10
April
12.6
12
15
12
11
May
9.8
8
12
10
10
June
9.8
8
11
9
12
July
9.0
9
10
8
9
August
8.6
8
9
10
8
September
9.1
9
9
10
8
October
10.5
11
9
11
11
November
10.4
9
11
11
11
December
10.0
7
10
11
10
Average
10.3
11.1
9.6
10.9
10.4
9.8
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
347°
238°
276°
303°
231°
February
223°
225°
285°
357°
282°
March
212°
223°
238°
192°
173°
April
191°
182°
191°
180°
May
166°
171°
122°
120°
June
145°
169°
166°
180°
July
184°
175°
180°
152°
August
162°
172°
179°
152°
September
155°
171°
178°
175°
October
208°
213°
208°
170°
November
197°
204°
203°
195°
December
245°
210°
200°
279°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.