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
80.9
71
79
86
85
79
February
83.1
95
88
83
72
85
March
91.1
98
85
91
96
84
April
93.1
96
96
96
94
87
May
92.1
90
85
95
90
June
97.4
98
96
95
99
July
98.0
99
96
99
98
August
96.5
99
96
100
99
September
95.5
97
95
99
90
October
88.3
89
92
90
81
November
91.2
96
91
97
91
December
86.9
84
75
97
91
Average
91.3
90.2
91.9
90.9
93.6
89.9
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
9.0
6
11
9
8
10
February
12.1
17
14
11
5
11
March
16.9
19
15
17
18
18
April
20.6
22
21
21
19
19
May
25.0
26
25
23
23
June
30.0
31
31
30
30
July
32.1
32
36
31
32
August
30.9
33
32
32
31
September
29.0
29
29
31
27
October
21.5
22
23
23
20
November
15.5
17
15
16
18
December
11.7
12
11
17
10
Average
20.6
16.0
21.8
21.9
21.0
20.8
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
-2.2
-5
0
-4
-1
0
February
0.4
4
2
-3
-5
0
March
5.4
7
5
3
6
8
April
8.6
11
8
9
8
7
May
14.4
15
16
13
13
June
19.0
18
19
19
19
July
21.2
21
23
20
22
August
20.3
21
21
21
19
September
16.9
17
16
17
15
October
9.9
11
9
12
8
November
3.4
4
3
4
5
December
1.6
2
3
5
0
Average
9.2
4.0
10.4
9.8
10.1
9.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.9
21
7
11
14
7
February
10.2
6
8
17
14
11
March
9.1
5
12
11
13
9
April
7.4
7
4
11
6
8
May
7.3
9
10
11
7
June
2.3
2
2
3
2
July
2.4
2
3
3
4
August
3.7
2
3
2
2
September
2.8
3
2
0
5
October
8.7
11
9
11
8
November
6.2
5
4
4
5
December
7.1
10
4
10
12
Average
6.7
9.2
6.1
7.2
7.2
6.3
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
8.6
7
9
9
8
9
February
9.4
10
8
10
9
9
March
9.6
10
9
10
10
9
April
9.7
11
9
11
9
8
May
8.1
6
10
8
8
June
7.2
6
7
7
8
July
6.4
7
7
6
7
August
6.2
6
6
7
6
September
6.6
6
6
7
7
October
8.3
9
8
8
9
November
8.4
7
9
8
9
December
8.3
9
8
9
8
Average
8.2
9.4
7.5
8.3
7.8
8.0
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
275°
240°
286°
279°
205°
February
208°
209°
263°
024°
263°
March
194°
206°
212°
184°
192°
April
193°
207°
190°
210°
213°
May
172°
179°
142°
153°
June
192°
173°
178°
192°
July
209°
201°
205°
187°
August
235°
161°
180°
164°
September
151°
140°
179°
186°
October
202°
221°
226°
192°
November
184°
199°
207°
190°
December
220°
206°
202°
241°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.