Statistics Frederick Douglass/Greater Rochester International Airport 2019-2023

Climate and trends: average temperature, flight conditions, precipitation, wind speed and direction.

Calculated from historical METAR data of Frederick Douglass/Greater Rochester International Airport (KROC) between 2019 and 2023.

VFR conditions (%)

Month	Average	2023	2022	2021	2020	2019
January	49.1	25	45	46	57	53
February	62.0	58	65	62	47	61
March	73.1	57	71	86	76	85
April	77.7	89	79	79	80	73
May	85.5	89	86	93	87	71
June	88.6	70	94	94	98	88
July	89.3	82	94	81	94	94
August	92.3	82	91	93	96	98
September	88.0		74	91	90	88
October	78.4		91	72	72	79
November	78.5		77	88	89	71
December	64.3		60	75	60	61
Average	78.7	70.9	79.1	81.5	80.9	78.5

1,597th best VFR conditions of United States

VFR conditions during daylight period

Percentage of observations where the VFR minimums for ceiling and visibility are met:

• Visibility: 5 mi or more
• Ceiling: 3,000 ft or more

Only observations between sunrise and sunset are taken into account.

Marginal VFR conditions (%)

Month	Average	2023	2022	2021	2020	2019
January	78.5	77	70	81	80	82
February	80.9	81	77	81	73	82
March	88.3	82	83	95	96	94
April	91.8	97	96	91	92	90
May	94.4	96	93	98	95	88
June	94.5	81	97	98	100	96
July	96.4	92	99	93	99	98
August	98.2	95	98	98	100	100
September	96.1		87	97	99	98
October	91.2		99	82	93	92
November	93.5		94	97	97	91
December	86.2		85	88	91	78
Average	91.4	88.0	90.6	92.2	93.6	91.6

Marginal VFR conditions or better during daylight period

Percentage of observations where the MVFR minimums for ceiling and visibility are met:

• Visibility: 3⅛ mi or more
• Ceiling: 1,000 ft or more

Only observations between sunrise and sunset are taken into account.

Maximum temperatures (°C)

Month	Average	2023	2022	2021	2020	2019
January	1.0	3	-2	1	3	-1
February	3.2	6	2	-1	2	2
March	6.7	5	8	10	9	6
April	13.2	16	13	14	10	13
May	20.1	20	22	20	18	19
June	25.2	24	26	27	26	25
July	27.8	27	28	26	30	29
August	26.7	25	28	28	27	27
September	23.2		21	23	22	24
October	16.7		16	18	15	17
November	8.7		11	9	12	6
December	3.4		3	6	4	3
Average	14.9	15.7	15.1	15.1	14.8	14.1

1,889th highest temperature of United States

Average highest temperature per day

The maximum temperature is typically observed some hours after noon.

Minimum temperatures (°C)

Month	Average	2023	2022	2021	2020	2019
January	-6.4	-1	-11	-4	-4	-8
February	-6.9	-5	-8	-8	-4	-6
March	-2.2	-2	-2	-1	1	-3
April	3.5	5	4	4	2	4
May	9.3	7	10	8	8	9
June	14.7	14	14	16	15	14
July	17.8	18	17	17	19	19
August	16.9	16	17	19	17	16
September	13.6		13	14	12	14
October	7.8		5	11	7	8
November	1.1		3	1	4	-1
December	-3.4		-2	0	-2	-4
Average	6.0	6.6	5.4	6.4	6.1	5.1

942nd lowest temperature of United States

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Precipitation (%)

Month	Average	2023	2022	2021	2020	2019
January	41.6	49	48	41	34	44
February	36.5	34	45	40	40	42
March	22.3	31	27	11	15	18
April	19.8	13	20	22	23	15
May	11.4	11	9	8	12	17
June	7.0	12	5	6	3	8
July	6.1	8	5	8	4	6
August	5.4	8	5	7	2	4
September	6.2		11	6	4	6
October	14.1		8	16	14	16
November	19.2		18	17	15	17
December	31.4		27	26	27	37
Average	16.9	19.2	17.5	15.7	14.4	17.1

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	2023	2022	2021	2020	2019
January	9.3	8	9	8	9	11
February	10.7	11	11	10	10	12
March	10.6	11	11	11	10	10
April	9.9	10	10	9	10	10
May	8.3	7	8	8	9	8
June	8.3	8	8	9	8	8
July	7.2	7	8	7	8	7
August	7.3	7	7	6	8	7
September	7.5		7	8	8	7
October	8.4		8	8	9	8
November	9.4		10	8	10	9
December	9.0		9	9	10	9
Average	8.7	8.4	8.8	8.4	8.9	8.7

1,889th highest wind speed of United States

Average wind speed

Excluding wind gusts. Only observations between sunrise and sunset are taken into account.

Prevailing wind direction

Month	2023	2022	2021	2020	2019
January	271°	289°	289°	265°	277°
February	265°	271°	268°	273°	261°
March	283°	277°	274°	254°	268°
April	263°	282°	294°	296°	276°
May	320°	302°	315°	295°	325°
June	346°	281°	264°	282°	280°
July	276°	271°	313°	275°	269°
August	285°	275°	267°	269°	275°
September		287°	263°	245°	261°
October		252°	277°	254°	227°
November		247°	257°	251°	264°
December		250°	248°	257°	255°

Prevailing wind direction

Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.