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
84.7
82
87
83
88
84
February
85.7
93
95
89
73
77
March
92.2
90
95
98
96
84
April
94.7
95
97
96
96
93
May
92.5
95
94
95
92
June
96.3
97
99
94
97
July
93.3
94
88
93
93
August
93.5
93
94
94
93
September
94.0
98
97
90
90
October
92.2
94
98
90
87
November
91.7
95
93
94
92
December
86.5
87
78
89
83
Average
91.5
90.2
93.9
93.2
91.4
89.0
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
6.9
5
10
5
6
9
February
10.5
13
13
10
5
9
March
15.5
17
14
17
17
16
April
19.8
21
20
19
19
18
May
24.3
23
26
24
23
June
28.6
27
31
29
29
July
29.3
29
26
30
31
August
28.1
28
24
30
28
September
26.1
27
19
26
26
October
20.8
21
19
22
20
November
13.5
15
14
13
17
December
10.7
11
9
15
9
Average
18.9
13.6
19.8
18.3
19.7
19.4
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
-1.5
-2
3
-4
-1
2
February
0.8
2
3
-1
-3
1
March
4.2
5
4
4
4
7
April
7.7
12
7
6
6
7
May
12.2
13
10
11
12
June
16.1
15
15
17
17
July
15.7
20
3
13
21
August
14.3
19
0
12
19
September
12.2
15
1
6
16
October
8.4
9
6
5
10
November
2.8
4
4
0
5
December
1.8
2
2
3
0
Average
7.7
3.9
9.4
3.7
6.1
9.4
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
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
5.3
5
7
4
5
6
February
5.7
7
8
4
4
6
March
6.5
7
7
6
7
7
April
5.6
8
7
4
5
5
May
4.5
5
3
5
5
June
4.0
4
2
5
5
July
3.3
4
4
3
3
August
3.4
4
4
3
3
September
3.6
3
5
3
4
October
4.7
5
6
5
4
November
5.2
5
6
5
5
December
5.6
5
5
6
6
Average
4.9
6.6
5.2
4.1
4.6
4.7
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
229°
233°
216°
206°
192°
February
230°
227°
186°
233°
218°
March
227°
222°
203°
178°
214°
April
223°
228°
194°
217°
232°
May
096°
183°
164°
207°
June
175°
206°
193°
190°
July
233°
231°
203°
213°
August
227°
213°
161°
203°
September
116°
127°
201°
170°
October
230°
212°
187°
184°
November
223°
222°
199°
206°
December
219°
205°
195°
211°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.