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
81.1
70
88
93
79
75
February
77.4
97
92
90
3
90
March
78.8
96
87
95
0
82
April
81.1
100
97
0
92
May
90.5
94
92
70
90
June
98.0
100
99
94
98
July
96.9
97
95
97
96
August
95.4
95
97
98
97
September
94.0
98
94
98
86
October
91.9
96
99
92
88
November
92.9
96
97
99
91
December
89.4
86
79
97
92
Average
88.9
88.0
94.2
94.6
69.6
90.0
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
5.9
2
9
6
6
6
February
9.2
16
12
9
1
9
March
15.1
18
13
16
16
16
April
20.1
22
20
20
19
May
23.8
27
25
22
23
June
28.7
31
31
31
32
July
32.4
33
33
31
33
August
31.2
33
32
32
31
September
29.1
30
30
29
26
October
20.6
22
22
22
19
November
13.6
15
13
15
17
December
9.9
10
8
15
10
Average
19.0
12.0
21.3
20.7
20.0
20.0
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
-4.5
-6
-1
-6
-2
-2
February
-3.5
1
-1
-5
-8
-2
March
3.5
4
2
2
5
6
April
7.2
7
7
7
7
May
12.8
13
15
13
13
June
15.9
18
19
11
19
July
20.7
20
21
20
22
August
19.3
21
20
19
19
September
15.9
16
15
17
14
October
8.5
9
8
11
7
November
1.9
3
1
3
4
December
-1.6
2
0
2
-2
Average
7.3
-1.8
9.1
8.3
8.2
8.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.1
13
5
6
4
8
February
4.8
3
7
11
0
6
March
5.2
2
12
10
0
4
April
3.4
1
6
0
4
May
5.0
6
8
9
3
June
2.4
3
3
5
2
July
2.6
1
6
3
4
August
2.2
0
3
3
1
September
3.5
0
1
2
14
October
6.1
1
5
9
1
November
4.5
4
2
1
0
December
4.5
11
7
1
0
Average
4.3
5.9
4.0
5.5
3.2
3.8
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
6.8
6
7
8
7
7
February
7.5
8
8
8
8
7
March
8.3
9
9
9
9
7
April
8.7
9
10
8
7
May
6.5
6
7
6
6
June
5.7
5
6
5
6
July
4.8
5
5
4
5
August
4.9
5
4
5
5
September
5.4
5
6
5
6
October
6.8
7
7
6
7
November
6.8
6
8
7
8
December
6.5
7
7
7
6
Average
6.7
7.8
6.5
7.0
6.2
6.2
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
302°
296°
328°
319°
302°
February
259°
233°
295°
024°
345°
March
225°
322°
267°
166°
201°
April
250°
234°
254°
301°
May
163°
172°
154°
062°
June
125°
202°
193°
198°
July
229°
168°
187°
145°
August
282°
151°
175°
131°
September
153°
161°
200°
146°
October
303°
276°
280°
267°
November
209°
265°
238°
229°
December
265°
237°
220°
285°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.