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
84.4
67
85
92
87
84
February
91.0
89
97
96
92
91
March
90.4
91
93
96
88
83
April
95.4
93
99
98
93
98
May
91.8
94
86
93
89
June
97.2
97
95
95
100
July
96.5
94
95
97
95
August
96.0
99
98
97
93
September
93.4
92
96
97
92
October
94.1
98
100
95
95
November
91.4
86
92
96
95
December
92.1
83
88
99
93
Average
92.3
85.3
93.2
94.4
94.0
92.4
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
6.5
2
7
8
8
7
February
9.3
14
11
9
3
9
March
14.8
17
13
15
16
15
April
20.4
23
22
21
19
21
May
24.6
26
26
23
23
June
31.5
30
32
32
33
July
32.9
33
35
32
32
August
32.2
34
35
34
32
September
29.3
31
31
31
27
October
20.7
22
23
22
19
November
14.0
16
13
16
16
December
9.5
10
8
14
10
Average
19.7
13.9
21.1
21.8
20.7
20.2
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
-6.1
-8
-6
-8
-4
-4
February
-6.7
-1
-6
-7
-10
-4
March
0.7
1
-1
-1
3
3
April
5.0
6
5
6
5
3
May
12.2
13
13
12
11
June
18.3
17
19
19
19
July
20.3
20
21
20
21
August
18.8
19
19
20
18
September
15.6
16
15
16
12
October
6.2
8
6
7
5
November
-1.7
1
-1
2
2
December
-5.9
-2
-5
-4
-4
Average
5.9
-1.5
7.0
6.7
7.1
6.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.7
16
13
12
5
7
February
9.2
4
3
9
21
11
March
6.9
6
6
8
14
7
April
4.5
2
5
0
4
2
May
7.0
7
14
7
9
June
2.9
5
5
2
1
July
2.6
2
4
3
3
August
1.7
1
1
0
1
September
3.8
8
3
1
6
October
5.5
1
4
4
2
November
7.0
13
9
2
4
December
6.4
20
3
3
5
Average
5.5
6.9
6.6
5.9
5.2
4.6
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
10.7
10
10
11
12
11
February
11.8
12
12
13
12
11
March
13.5
13
14
14
14
12
April
14.2
15
14
16
14
13
May
11.1
11
13
12
11
June
11.2
8
12
9
14
July
9.5
9
10
9
10
August
9.5
9
9
11
10
September
11.3
10
11
12
10
October
11.7
13
10
11
12
November
11.8
10
13
11
13
December
10.7
10
12
10
10
Average
11.5
12.5
10.8
12.0
11.3
11.4
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
317°
325°
315°
318°
324°
February
293°
282°
337°
022°
331°
March
010°
329°
336°
186°
179°
April
272°
242°
231°
253°
349°
May
144°
118°
135°
071°
June
120°
171°
164°
180°
July
144°
151°
150°
143°
August
175°
152°
168°
156°
September
158°
158°
172°
141°
October
174°
225°
288°
122°
November
196°
241°
266°
209°
December
301°
243°
249°
317°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.