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
83.2
83
78
93
80
86
February
88.5
91
92
93
89
81
March
92.6
91
94
97
93
87
April
94.9
96
95
96
96
May
93.5
95
90
96
92
June
92.8
91
98
92
94
July
87.7
87
86
87
90
August
87.1
87
86
85
87
September
88.2
88
90
81
91
October
88.7
95
97
79
84
November
91.9
97
91
97
95
December
84.4
84
67
91
85
Average
89.6
90.0
90.3
90.1
88.8
89.4
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
8.9
7
12
7
8
11
February
13.4
15
15
13
9
11
March
16.7
18
16
18
18
18
April
21.0
22
21
20
20
May
25.3
24
27
24
23
June
28.1
27
30
28
28
July
30.2
30
31
29
31
August
29.1
29
29
29
29
September
26.8
26
25
26
26
October
21.4
21
20
21
22
November
15.0
17
16
14
18
December
11.3
12
11
15
9
Average
19.9
15.3
20.8
20.7
20.2
20.7
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
-3
2
-4
0
3
February
2.2
2
4
-1
-1
2
March
4.5
5
4
4
5
9
April
8.0
10
7
6
6
May
13.5
13
17
11
12
June
16.9
14
18
18
16
July
19.8
19
21
19
20
August
19.1
20
19
20
20
September
15.4
14
15
15
16
October
9.1
9
6
12
10
November
2.4
3
4
0
3
December
1.3
1
4
4
-2
Average
8.6
3.1
9.0
9.0
9.1
9.8
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
3.1
3
4
4
3
3
February
4.0
4
5
5
4
4
March
4.4
4
5
5
4
4
April
4.3
5
4
4
4
May
3.5
4
4
3
4
June
3.1
3
4
4
3
July
2.3
2
3
3
2
August
2.2
3
2
2
2
September
2.4
2
3
2
3
October
2.6
3
3
3
3
November
3.0
3
4
3
3
December
2.5
2
2
4
3
Average
3.2
3.9
3.2
3.4
3.1
3.2
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
276°
220°
206°
289°
160°
February
197°
193°
198°
301°
206°
March
242°
202°
212°
185°
207°
April
221°
218°
213°
241°
May
136°
182°
134°
174°
June
125°
140°
173°
180°
July
176°
163°
173°
164°
August
158°
164°
093°
180°
September
027°
025°
183°
126°
October
209°
094°
182°
182°
November
109°
221°
177°
201°
December
235°
231°
198°
184°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.