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
January
89.3
89
February
94.0
94
March
93.7
94
80
April
97.3
97
May
99.4
99
June
98.3
98
July
100.0
100
August
98.9
99
September
92.2
92
October
99.6
100
November
97.4
97
December
94.7
95
Average
95.0
92.5
97.6
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
January
2.4
3
February
5.4
5
March
8.6
9
3
April
12.8
13
May
19.9
20
June
23.2
23
July
30.8
31
August
27.6
28
September
22.3
22
October
17.1
17
November
9.4
10
December
4.1
4
Average
12.1
5.5
18.6
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
January
-7.2
-7
February
-5.6
-4
March
-3.6
-2
-2
April
0.1
0
May
5.9
6
June
8.0
8
July
14.4
14
August
12.6
13
September
7.4
8
October
3.4
4
November
-3.3
-3
December
-7.6
-6
Average
0.1
-5.5
4.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
January
4.6
5
February
7.6
8
March
7.4
8
0
April
4.7
5
May
1.1
1
June
1.1
1
July
0.8
1
August
1.6
2
September
1.5
2
October
1.2
1
November
4.3
4
December
5.6
6
Average
4.5
6.6
2.3
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
January
9.9
10
February
11.3
11
March
10.9
11
8
April
11.9
12
May
11.0
11
June
11.6
12
July
8.9
9
August
8.5
9
September
8.6
9
October
10.0
10
November
8.9
9
December
8.0
8
Average
10.2
10.7
9.8
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
January
238°
February
189°
March
204°
285°
April
244°
May
179°
June
182°
July
215°
August
191°
September
178°
October
233°
November
187°
December
273°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.