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
80.5
73
82
93
75
February
86.3
96
97
86
84
March
91.7
97
92
98
90
April
95.7
100
97
96
May
93.2
94
92
88
June
97.7
99
98
98
July
96.2
98
96
96
93
August
96.5
96
98
97
94
September
95.4
98
94
93
92
October
92.4
94
96
86
100
November
91.2
96
92
100
December
85.8
85
79
85
Average
92.0
88.9
94.8
94.1
93.0
90.2
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
5.1
3
9
4
6
February
10.2
14
12
7
8
March
13.5
17
13
15
15
April
18.7
20
18
18
May
24.4
25
24
22
June
29.5
30
30
30
July
30.6
31
31
30
31
August
28.7
29
29
30
27
September
27.5
27
27
27
26
October
20.6
21
21
21
19
November
11.7
19
13
13
December
9.0
9
7
13
Average
18.6
11.6
20.9
19.2
21.5
19.9
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
-3.3
-4
1
-6
-1
February
0.1
2
2
-4
-1
March
3.7
6
3
4
5
April
7.8
8
8
8
May
14.6
14
15
13
June
18.5
17
19
19
July
21.0
21
22
21
22
August
19.2
20
19
20
18
September
16.0
15
14
16
15
October
9.8
10
7
13
9
November
2.1
6
3
2
December
0.7
1
1
4
Average
8.7
1.4
10.3
8.7
11.7
10.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.1
12
7
5
8
February
6.7
1
5
13
10
March
7.6
3
9
8
10
April
6.9
1
9
9
May
4.5
1
4
9
June
2.2
2
3
2
July
2.6
2
5
1
2
August
3.0
3
3
1
4
September
2.8
2
2
5
3
October
6.7
7
2
8
0
November
4.7
0
4
2
December
7.8
14
8
5
Average
5.0
5.1
3.9
5.2
3.6
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
7.1
6
8
8
7
February
7.4
8
7
7
8
March
8.0
8
9
8
8
April
8.2
8
8
8
May
6.6
6
7
7
June
5.7
5
5
6
July
4.8
5
5
4
5
August
4.7
5
5
5
4
September
4.9
4
5
6
5
October
6.7
7
7
7
7
November
6.7
7
7
7
December
6.9
8
6
8
Average
6.5
7.5
6.4
6.5
5.9
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
257°
245°
287°
230°
February
217°
219°
232°
276°
March
206°
219°
218°
196°
April
208°
201°
239°
May
086°
185°
179°
June
359°
214°
184°
July
235°
190°
029°
172°
August
214°
193°
181°
090°
September
164°
317°
187°
135°
October
238°
216°
210°
288°
November
187°
220°
219°
December
186°
200°
200°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.