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
87.4
87
89
86
91
92
February
84.1
77
86
90
69
82
March
91.1
83
92
97
94
85
April
94.0
96
96
96
92
May
92.2
94
90
90
95
June
89.3
91
96
66
93
July
88.6
89
88
90
90
August
88.8
87
89
92
84
September
87.1
87
92
84
90
October
89.2
92
96
87
83
November
90.9
94
89
96
91
December
86.8
88
83
92
87
Average
88.6
82.4
90.4
91.4
87.1
88.8
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
8.2
6
12
6
7
10
February
12.5
14
14
12
7
11
March
15.9
18
16
18
18
17
April
20.0
21
20
19
19
May
24.4
24
25
23
23
June
27.6
26
30
28
28
July
29.5
29
30
29
31
August
28.4
28
29
29
29
September
26.3
26
25
26
25
October
20.6
21
18
22
21
November
14.2
16
15
13
17
December
10.8
12
10
15
9
Average
19.0
12.6
20.3
20.0
19.6
19.9
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
-1.3
-2
2
-4
-1
2
February
1.9
2
4
-1
-1
2
March
3.9
5
3
4
3
7
April
6.8
7
7
4
6
May
12.8
11
14
11
11
June
16.0
15
16
17
15
July
18.5
19
20
18
17
August
18.0
18
18
19
17
September
14.8
14
14
15
14
October
8.8
9
6
11
10
November
2.2
2
3
0
4
December
1.3
1
3
4
-1
Average
7.8
1.3
8.8
8.5
8.3
8.7
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
4.8
5
5
5
5
5
February
5.2
5
5
6
4
6
March
5.7
5
5
7
6
6
April
5.3
5
6
5
5
May
4.0
4
5
4
4
June
3.4
3
4
4
3
July
2.8
3
3
4
2
August
2.6
3
3
3
2
September
3.0
3
4
3
3
October
3.6
3
5
4
3
November
4.2
3
4
4
4
December
4.3
4
5
5
4
Average
4.1
4.9
3.8
4.5
4.0
3.8
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
217°
203°
251°
218°
199°
February
222°
211°
203°
243°
202°
March
234°
243°
224°
174°
219°
April
235°
218°
246°
253°
May
342°
182°
306°
211°
June
267°
266°
181°
240°
July
235°
213°
231°
227°
August
324°
193°
127°
220°
September
019°
033°
219°
102°
October
244°
189°
179°
144°
November
186°
209°
211°
203°
December
193°
178°
181°
167°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.