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
81.3
75
76
82
81
82
February
87.6
96
95
90
85
83
March
90.2
87
92
90
95
91
April
94.6
91
98
92
96
96
May
93.7
98
93
92
94
June
94.9
88
98
97
97
July
95.1
89
95
95
98
August
95.0
97
94
93
96
September
93.7
88
94
95
98
October
90.3
87
95
86
87
November
91.2
93
89
97
94
December
85.3
90
82
89
84
Average
91.2
87.6
91.0
91.8
92.0
92.2
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
3.5
4
7
1
2
6
February
7.3
10
11
6
1
5
March
10.9
14
10
12
14
13
April
16.9
19
18
15
17
14
May
22.1
21
23
21
20
June
26.0
25
27
27
27
July
28.3
28
28
27
30
August
27.3
27
27
28
28
September
24.4
25
23
24
24
October
18.1
19
16
20
17
November
10.3
12
12
10
14
December
6.2
9
5
9
4
Average
16.1
11.7
17.6
16.5
16.7
16.8
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
-4.1
-2
0
-8
-3
-2
February
-3.8
-1
-1
-4
-6
-2
March
0.7
4
0
1
1
3
April
6.1
9
6
5
6
4
May
11.6
10
12
10
10
June
15.9
14
16
17
16
July
18.8
19
19
18
20
August
17.8
18
18
19
18
September
14.7
15
14
15
13
October
8.7
10
5
11
8
November
1.4
2
3
0
4
December
-1.1
3
-1
1
-2
Average
6.8
2.5
7.9
6.9
7.5
7.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
31.8
38
34
31
26
31
February
23.3
10
13
29
29
30
March
19.9
21
24
26
9
13
April
14.6
16
11
18
13
15
May
11.4
13
13
15
10
June
5.0
6
5
4
3
July
4.9
7
8
6
2
August
5.0
5
5
9
3
September
6.6
8
7
5
3
October
13.1
14
12
16
13
November
16.3
13
19
10
17
December
20.5
18
26
16
17
Average
14.4
20.8
12.9
15.2
12.3
12.0
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
8.0
8
7
9
8
8
February
8.6
8
10
9
8
8
March
9.2
9
10
10
9
8
April
8.6
9
8
9
9
9
May
7.5
7
7
7
9
June
7.0
7
7
6
7
July
6.1
6
7
7
6
August
5.8
6
6
5
6
September
6.0
5
6
7
6
October
6.8
7
7
7
7
November
7.6
8
8
7
8
December
7.2
7
7
7
8
Average
7.5
8.4
7.1
7.5
7.1
7.5
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
245°
249°
265°
274°
264°
February
267°
250°
257°
288°
258°
March
268°
272°
262°
273°
241°
April
265°
249°
256°
274°
285°
May
319°
195°
300°
233°
June
305°
274°
230°
250°
July
248°
253°
271°
274°
August
274°
253°
246°
265°
September
004°
267°
241°
239°
October
259°
241°
232°
257°
November
248°
235°
252°
250°
December
230°
246°
229°
245°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.