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
78.0
82
73
82
79
81
February
75.2
79
86
71
69
March
85.9
95
87
95
81
68
April
91.9
90
92
94
93
May
92.3
94
89
94
90
June
91.5
91
96
92
95
July
91.5
93
87
96
August
88.9
89
92
88
September
91.8
97
88
90
90
October
90.0
97
98
74
86
November
88.1
91
91
99
93
December
81.1
99
66
78
82
Average
87.8
90.0
89.7
89.6
84.6
86.8
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
7.9
5
11
7
7
10
February
11.3
14
12
9
10
March
16.0
18
16
17
17
16
April
19.3
20
19
19
18
May
23.8
23
24
23
22
June
26.7
26
29
27
27
July
28.8
29
30
30
August
27.8
28
28
28
September
26.2
26
24
25
24
October
20.1
21
18
20
21
November
12.7
14
14
9
16
December
10.4
10
10
14
8
Average
18.2
11.7
20.1
19.5
16.1
19.2
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
0.4
1
3
-3
0
3
February
2.2
5
0
0
2
March
5.7
7
5
6
6
8
April
8.6
10
9
7
8
May
13.9
13
15
12
12
June
17.4
16
18
18
17
July
19.7
19
21
20
August
18.9
19
19
19
September
16.4
15
14
18
16
October
10.4
10
7
13
11
November
4.5
8
6
3
6
December
3.0
4
3
6
0
Average
9.2
3.8
10.8
9.7
7.3
10.1
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
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
August
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
5.1
4
6
5
5
5
February
5.8
6
6
5
6
March
6.3
6
6
7
6
6
April
6.0
5
7
6
6
May
4.5
4
4
4
5
June
4.1
4
4
4
4
July
3.3
3
4
3
August
3.0
4
3
3
September
3.2
3
4
2
3
October
4.1
4
5
4
4
November
4.9
5
5
5
5
December
4.7
4
4
6
5
Average
4.6
5.2
4.4
4.6
4.9
4.5
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
218°
236°
282°
244°
228°
February
221°
222°
275°
233°
March
246°
238°
226°
227°
225°
April
223°
221°
241°
288°
May
242°
203°
258°
216°
June
252°
215°
212°
216°
July
232°
219°
248°
August
269°
214°
221°
September
352°
001°
167°
188°
October
270°
280°
213°
209°
November
197°
250°
214°
231°
December
252°
229°
216°
233°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.