Climate Niagara Health System Heliport 2020-2024

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

Calculated from historical METAR data of St. Catharines/Niagara District Airport (CYSN) between 2020 and 2024.

VFR conditions (%)

Month	Average	2024	2023	2022	2021	2020
January	51.1	32	32	49	56	62
February	68.3	75	68	75	61	63
March	75.1	75	67	75	87	66
April	79.7		81	85	84	85
May	86.6		90	90	92	86
June	89.6		76	94	94	98
July	90.8		84	96	86	93
August	93.0		86	92	94	97
September	89.0		89	79	91	85
October	80.3		84	91	65	83
November	77.8		82	69	83	86
December	62.3		55	61	75	62
Average	77.8	60.8	75.6	81.4	82.1	81.6

51st best VFR conditions of Canada

VFR conditions during daylight period

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	82.5	63	79	79	90	91
February	87.0	97	90	88	84	81
March	90.0	89	87	83	98	90
April	91.9		96	97	90	95
May	93.3		99	96	96	94
June	95.7		89	97	98	100
July	97.0		95	98	94	100
August	98.6		96	99	99	99
September	96.8		100	88	98	94
October	93.1		99	97	83	97
November	92.4		96	81	96	96
December	84.8		74	86	87	90
Average	91.4	82.7	92.0	91.4	93.1	94.2

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	0.7	1	3	-2	1	3
February	2.7	5	5	2	-1	2
March	6.4	9	5	7	10	8
April	12.3		14	13	13	11
May	19.4		19	21	19	18
June	24.9		24	26	27	26
July	27.9		28	28	26	30
August	26.7		25	28	29	28
September	23.2		23	23	23	22
October	16.5		17	16	18	15
November	8.6		9	10	9	12
December	3.9		6	3	6	4
Average	13.3	5.0	14.7	14.9	15.0	14.9

13th highest temperature of Canada

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	-5.3	-3	-1	-10	-3	-3
February	-5.9	-2	-3	-6	-6	-4
March	-1.0	1	-1	-1	0	1
April	3.4		5	4	4	3
May	9.9		9	11	10	9
June	16.2		16	16	18	17
July	19.5		19	19	18	21
August	17.9		17	18	20	18
September	14.2		14	15	15	13
October	8.7		10	6	12	7
November	1.8		2	3	2	5
December	-2.7		2	0	0	-1
Average	5.7	-2.4	7.3	6.5	7.4	7.2

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	28.7	36	34	42	14	18
February	24.1	11	15	34	28	31
March	18.1	16	29	21	5	18
April	15.7		16	14	12	13
May	10.4		8	11	8	11
June	7.1		12	6	8	2
July	5.0		8	5	8	4
August	4.5		7	6	4	3
September	5.0		1	14	6	3
October	13.2		14	11	16	11
November	14.9		13	18	15	14
December	22.7		27	22	17	16
Average	14.3	20.9	14.8	15.9	11.0	11.2

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	9.9	10	9	10	9	9
February	11.4	10	13	13	11	11
March	10.9	10	11	11	11	10
April	10.1		10	10	9	11
May	8.6		8	9	8	9
June	8.6		7	9	10	9
July	7.6		7	9	7	8
August	8.0		8	8	7	8
September	8.1		7	8	9	10
October	9.4		10	9	8	10
November	10.4		10	10	10	12
December	9.8		8	10	11	11
Average	9.4	10.0	8.9	9.6	9.0	9.6

13th highest wind speed of Canada

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	247°	249°	261°	281°	256°
February	248°	245°	247°	246°	257°
March	263°	266°	260°	264°	259°
April		243°	256°	277°	282°
May		307°	282°	289°	300°
June		355°	250°	229°	247°
July		243°	248°	283°	259°
August		272°	244°	249°	250°
September		250°	251°	244°	233°
October		249°	224°	241°	236°
November		246°	238°	238°	236°
December		250°	238°	232°	249°

Prevailing wind direction

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