Lake Erie Metropark
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Erie Metropark clear sky chart from 2005-11-06 to 2024-11-04.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	13% 9% 3 8% 5% 5% 5% 4 6% 8% 35%	100801
	Night	15% 10% 3 8% 5% 4 4 4 5% 7% 35%	98123
Transparency	Day	44% 8% 14% 21% 12% 1	104430
	Night	46% 7% 12% 21% 13% 1	102620
Seeing	Day	15% 8% 26% 28% 18% 6%	15383
	Night	18% 7% 28% 30% 14% 2	25337

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	16% 15% 6% 12% 8% 5% 5% 3 5% 5% 19%	2527
	11th to 20th	Day	15% 16% 5% 14% 8% 8% 8% 5% 6% 5% 11%	2572
	21st to end	Day	27% 17% 6% 11% 7% 5% 3 2 4 4 13%	3124
February	1st to 10th	Day	15% 15% 4 11% 7% 6% 5% 5% 5% 4 23%	1710
	11th to 20th	Day	14% 10% 4 12% 8% 7% 6% 3 5% 7% 25%	1792
	21st to end	Day	16% 11% 4 10% 6% 6% 5% 4 5% 6% 28%	1570
March	1st to 10th	Day	17% 13% 4 9% 7% 5% 4 3 6% 6% 27%	3213
	11th to 20th	Day	13% 10% 2 8% 6% 6% 5% 4 5% 7% 33%	3480
	21st to end	Day	17% 10% 4 9% 6% 5% 5% 4 6% 7% 28%	3815
April	1st to 10th	Day	13% 11% 3 8% 6% 5% 5% 4 6% 6% 33%	2189
	11th to 20th	Day	17% 7% 2 7% 5% 5% 5% 5% 5% 7% 34%	2412
	21st to end	Day	17% 8% 3 7% 5% 4 4 4 5% 7% 36%	2470
May	1st to 10th	Day	16% 8% 3 7% 6% 5% 5% 4 5% 7% 34%	4082
	11th to 20th	Day	15% 8% 3 6% 5% 5% 5% 4 7% 9% 34%	4081
	21st to end	Day	8% 5% 2 7% 5% 5% 5% 4 6% 8% 46%	4476
June	1st to 10th	Day	9% 7% 3 6% 5% 5% 5% 5% 7% 9% 40%	2588
	11th to 20th	Day	9% 5% 2 6% 4 5% 6% 5% 7% 9% 42%	2660
	21st to end	Day	9% 5% 2 5% 6% 5% 5% 5% 8% 10% 39%	2660
July	1st to 10th	Day	10% 5% 2 6% 4 5% 5% 5% 6% 10% 41%	4440
	11th to 20th	Day	7% 4 2 5% 5% 4 5% 4 7% 10% 48%	4422
	21st to end	Day	6% 5% 2 7% 5% 5% 6% 4 7% 9% 43%	4466
August	1st to 10th	Day	10% 5% 2 5% 4 4 5% 5% 6% 9% 45%	4104
	11th to 20th	Day	8% 5% 2 6% 5% 5% 7% 5% 8% 10% 38%	4044
	21st to end	Day	7% 5% 2 6% 5% 5% 6% 4 8% 11% 40%	4500
September	1st to 10th	Day	9% 6% 3 6% 4 4 5% 4 7% 7% 45%	2133
	11th to 20th	Day	8% 5% 1 5% 4 4 5% 5% 6% 8% 48%	2090
	21st to end	Day	15% 6% 3 7% 4 3 4 4 6% 8% 40%	2090
October	1st to 10th	Day	12% 5% 3 6% 5% 5% 4 3 5% 9% 44%	2032
	11th to 20th	Day	16% 9% 2 7% 5% 5% 5% 4 5% 7% 35%	1900
	21st to end	Day	19% 8% 3 7% 5% 5% 5% 5% 5% 7% 32%	1961
November	1st to 10th	Day	9% 8% 3 7% 6% 4 4 4 6% 8% 40%	1699
	11th to 20th	Day	13% 13% 3 7% 5% 5% 5% 4 5% 6% 33%	1710
	21st to end	Day	18% 11% 3 9% 5% 4 4 3 6% 7% 28%	1634
December	1st to 10th	Day	16% 14% 6% 12% 7% 6% 6% 4 4 6% 21%	1520
	11th to 20th	Day	15% 15% 5% 10% 6% 5% 5% 4 6% 7% 23%	1852
	21st to end	Day	23% 18% 7% 13% 7% 5% 4 3 4 5% 11%	2783
January	1st to 10th	Night	16% 15% 6% 11% 5% 5% 4 4 4 5% 25%	4428
	11th to 20th	Night	15% 19% 7% 12% 6% 4 5% 4 7% 7% 14%	4379
	21st to end	Night	26% 18% 7% 11% 5% 4 3 3 3 4 16%	4532
February	1st to 10th	Night	17% 14% 5% 11% 6% 5% 4 4 4 5% 24%	2470
	11th to 20th	Night	15% 13% 4 8% 7% 5% 4 4 5% 6% 28%	2270
	21st to end	Night	19% 11% 4 10% 5% 4 4 3 5% 5% 29%	1884
March	1st to 10th	Night	16% 13% 4 8% 4 4 3 3 4 6% 35%	3638
	11th to 20th	Night	10% 8% 2 6% 5% 4 5% 4 6% 8% 43%	3480
	21st to end	Night	16% 8% 3 8% 5% 5% 4 4 5% 6% 36%	3817
April	1st to 10th	Night	15% 10% 4 7% 4 5% 4 4 5% 7% 36%	2008
	11th to 20th	Night	18% 8% 2 6% 4 4 5% 4 6% 6% 36%	1716
	21st to end	Night	16% 8% 3 6% 4 4 4 4 5% 7% 38%	1710
May	1st to 10th	Night	17% 8% 3 8% 5% 5% 4 4 5% 8% 33%	2813
	11th to 20th	Night	15% 7% 3 9% 5% 4 4 3 6% 7% 36%	2812
	21st to end	Night	9% 5% 2 6% 4 5% 4 4 5% 8% 48%	3079
June	1st to 10th	Night	11% 4 2 5% 4 5% 4 5% 6% 9% 44%	1587
	11th to 20th	Night	10% 5% 2 7% 4 5% 4 5% 7% 9% 42%	1465
	21st to end	Night	10% 4 2 6% 5% 4 4 5% 7% 8% 46%	1520
July	1st to 10th	Night	9% 3 2 5% 4 3 5% 4 6% 10% 50%	2530
	11th to 20th	Night	8% 4 1 5% 4 3 4 4 6% 10% 51%	2543
	21st to end	Night	5% 4 2 6% 4 5% 5% 5% 8% 9% 47%	3087
August	1st to 10th	Night	11% 6% 2 5% 4 4 4 4 6% 9% 45%	2825
	11th to 20th	Night	7% 5% 2 5% 4 4 5% 4 6% 8% 49%	2785
	21st to end	Night	7% 4 2 6% 4 5% 6% 4 7% 8% 47%	3152
September	1st to 10th	Night	9% 5% 2 6% 5% 4 4 4 6% 7% 48%	2027
	11th to 20th	Night	9% 4 1 5% 4 4 4 3 4 7% 55%	2090
	21st to end	Night	15% 6% 2 7% 4 4 4 3 5% 6% 43%	2090
October	1st to 10th	Night	13% 5% 3 6% 4 4 4 3 6% 6% 47%	2147
	11th to 20th	Night	16% 8% 2 7% 5% 5% 4 4 5% 6% 37%	2280
	21st to end	Night	20% 8% 2 7% 4 5% 3 3 5% 7% 35%	2635
November	1st to 10th	Night	13% 8% 2 6% 4 4 4 4 5% 7% 43%	2452
	11th to 20th	Night	16% 9% 3 8% 6% 4 4 4 6% 7% 31%	2470
	21st to end	Night	21% 13% 4 7% 4 4 4 3 5% 7% 28%	2541
December	1st to 10th	Night	18% 15% 5% 9% 7% 4 5% 3 5% 6% 22%	2660
	11th to 20th	Night	15% 13% 4 10% 6% 5% 6% 4 5% 6% 25%	3317
	21st to end	Night	27% 18% 6% 12% 6% 4 4 3 4 4 12%	4884

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	64% 9% 10% 12% 5%	2528
	11th to 20th	Day	73% 8% 10% 6% 3	2572
	21st to end	Day	74% 6% 8% 7% 4	3124
February	1st to 10th	Day	60% 7% 12% 14% 7%	1710
	11th to 20th	Day	59% 5% 12% 16% 7% 1	1802
	21st to end	Day	53% 8% 13% 17% 7% 2	1570
March	1st to 10th	Day	56% 7% 13% 19% 5%	3213
	11th to 20th	Day	46% 8% 17% 19% 8% 1	3480
	21st to end	Day	52% 9% 14% 16% 9% 1	3815
April	1st to 10th	Day	49% 8% 12% 17% 13%	2189
	11th to 20th	Day	47% 7% 12% 20% 12% 2	2412
	21st to end	Day	46% 7% 14% 20% 12% 2	2470
May	1st to 10th	Day	45% 8% 13% 22% 10% 1	4120
	11th to 20th	Day	42% 10% 16% 21% 9% 1	4085
	21st to end	Day	34% 9% 12% 19% 21% 6%	4489
June	1st to 10th	Day	36% 9% 14% 26% 13% 3	2588
	11th to 20th	Day	34% 10% 15% 21% 18% 2	2660
	21st to end	Day	35% 11% 15% 21% 16% 2	2660
July	1st to 10th	Day	37% 7% 14% 22% 18% 2	4371
	11th to 20th	Day	29% 7% 14% 32% 17% 1	4347
	21st to end	Day	34% 8% 17% 18% 21% 3	4324
August	1st to 10th	Day	33% 9% 16% 28% 14% 1	4091
	11th to 20th	Day	35% 9% 14% 32% 10% 1	4083
	21st to end	Day	33% 9% 15% 29% 12% 1	4499
September	1st to 10th	Day	35% 9% 16% 22% 16% 2	2133
	11th to 20th	Day	30% 9% 14% 30% 16% 1	2090
	21st to end	Day	40% 8% 13% 24% 14%	2090
October	1st to 10th	Day	29% 5% 13% 32% 20% 1	3370
	11th to 20th	Day	39% 5% 11% 27% 18%	3140
	21st to end	Day	41% 6% 15% 23% 14% 1	3211
November	1st to 10th	Day	41% 7% 14% 23% 13% 1	1699
	11th to 20th	Day	52% 6% 14% 19% 9% 1	1710
	21st to end	Day	54% 6% 15% 17% 7%	1634
December	1st to 10th	Day	63% 8% 12% 13% 4	1520
	11th to 20th	Day	60% 7% 12% 16% 5%	1848
	21st to end	Day	75% 6% 9% 6% 3	2783
January	1st to 10th	Night	61% 7% 12% 15% 6% 1	4428
	11th to 20th	Night	68% 9% 12% 7% 4	4379
	21st to end	Night	72% 6% 9% 10% 3	4532
February	1st to 10th	Night	61% 6% 11% 14% 6% 1	2470
	11th to 20th	Night	57% 5% 11% 18% 8% 1	2271
	21st to end	Night	56% 6% 11% 17% 8% 2	1884
March	1st to 10th	Night	50% 5% 13% 23% 8%	3638
	11th to 20th	Night	37% 7% 17% 19% 18% 1	3480
	21st to end	Night	46% 7% 13% 22% 10% 1	3817
April	1st to 10th	Night	48% 6% 10% 20% 13% 2	2008
	11th to 20th	Night	45% 6% 11% 19% 17% 2	1716
	21st to end	Night	44% 6% 13% 19% 16% 3	1710
May	1st to 10th	Night	47% 8% 11% 18% 14% 2	2840
	11th to 20th	Night	43% 8% 11% 25% 11% 1	2813
	21st to end	Night	32% 7% 12% 22% 23% 4	3087
June	1st to 10th	Night	35% 7% 11% 27% 17% 3	1587
	11th to 20th	Night	36% 8% 13% 25% 16% 3	1465
	21st to end	Night	33% 8% 12% 25% 21% 1	1520
July	1st to 10th	Night	29% 5% 13% 32% 15% 6%	2490
	11th to 20th	Night	28% 7% 14% 30% 18% 2	2495
	21st to end	Night	30% 8% 19% 19% 22% 2	2988
August	1st to 10th	Night	35% 7% 11% 28% 17% 2	2814
	11th to 20th	Night	32% 8% 12% 33% 14% 2	2812
	21st to end	Night	33% 7% 13% 30% 15% 2	3152
September	1st to 10th	Night	34% 8% 12% 26% 17% 3	2027
	11th to 20th	Night	29% 6% 11% 30% 21% 2	2090
	21st to end	Night	41% 6% 12% 24% 15% 1	2090
October	1st to 10th	Night	26% 5% 9% 32% 27% 1	3576
	11th to 20th	Night	40% 5% 11% 25% 18% 1	3779
	21st to end	Night	38% 4 11% 30% 16% 1	4335
November	1st to 10th	Night	40% 6% 13% 24% 15% 1	2452
	11th to 20th	Night	51% 7% 13% 20% 9% 1	2470
	21st to end	Night	56% 5% 13% 19% 6%	2541
December	1st to 10th	Night	63% 8% 10% 14% 6%	2660
	11th to 20th	Night	58% 8% 14% 13% 6% 1	3320
	21st to end	Night	74% 7% 10% 7% 2	4884

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	21% 14% 33% 24% 7% 1	270
	11th to 20th	Day	21% 11% 43% 19% 5% 1	270
	21st to end	Day	28% 13% 26% 28% 5%	297
February	1st to 10th	Day	22% 14% 40% 19% 4 1	270
	11th to 20th	Day	19% 21% 34% 20% 6%	270
	21st to end	Day	21% 18% 40% 17% 4	225
March	1st to 10th	Day	18% 16% 36% 24% 6%	324
	11th to 20th	Day	19% 12% 32% 29% 8% 1	460
	21st to end	Day	22% 12% 33% 25% 7% 1	506
April	1st to 10th	Day	15% 10% 35% 31% 8% 1	460
	11th to 20th	Day	21% 14% 30% 22% 10% 4	452
	21st to end	Day	19% 10% 34% 25% 10% 2	460
May	1st to 10th	Day	22% 8% 30% 25% 13% 4	463
	11th to 20th	Day	18% 4 28% 26% 18% 5%	487
	21st to end	Day	12% 3 21% 33% 23% 8%	529
June	1st to 10th	Day	11% 6% 23% 38% 19% 4	608
	11th to 20th	Day	11% 4 23% 38% 21% 4	680
	21st to end	Day	11% 5% 23% 36% 21% 4	680
July	1st to 10th	Day	9% 3 17% 32% 27% 12%	671
	11th to 20th	Day	10% 3 18% 35% 25% 10%	663
	21st to end	Day	7% 5% 12% 34% 33% 9%	532
August	1st to 10th	Day	9% 3 15% 31% 28% 15%	486
	11th to 20th	Day	12% 3 14% 30% 30% 11%	479
	21st to end	Day	9% 3 15% 27% 35% 12%	539
September	1st to 10th	Day	11% 3 18% 27% 28% 12%	490
	11th to 20th	Day	7% 4 14% 25% 34% 16%	490
	21st to end	Day	18% 8% 19% 25% 21% 9%	490
October	1st to 10th	Day	11% 6% 23% 29% 22% 9%	490
	11th to 20th	Day	17% 13% 29% 25% 13% 3	490
	21st to end	Day	23% 11% 33% 22% 10% 1	410
November	1st to 10th	Day	14% 11% 30% 25% 16% 3	279
	11th to 20th	Day	17% 21% 29% 24% 8% 1	270
	21st to end	Day	25% 12% 35% 24% 4	234
December	1st to 10th	Day	18% 20% 31% 22% 8% 1	180
	11th to 20th	Day	22% 18% 39% 17% 4 1	182
	21st to end	Day	25% 18% 35% 20% 4	297
January	1st to 10th	Night	23% 12% 36% 22% 7% 1	950
	11th to 20th	Night	27% 12% 32% 23% 5%	915
	21st to end	Night	22% 9% 35% 29% 5%	836
February	1st to 10th	Night	24% 8% 37% 27% 4	760
	11th to 20th	Night	22% 10% 34% 29% 4	743
	21st to end	Night	24% 11% 41% 22% 2	628
March	1st to 10th	Night	19% 9% 36% 29% 7%	760
	11th to 20th	Night	18% 10% 36% 28% 6% 1	760
	21st to end	Night	21% 8% 31% 29% 9% 1	836
April	1st to 10th	Night	19% 10% 34% 31% 5% 1	678
	11th to 20th	Night	20% 8% 34% 27% 10% 1	563
	21st to end	Night	20% 7% 31% 33% 9%	570
May	1st to 10th	Night	19% 5% 31% 32% 12% 1	570
	11th to 20th	Night	21% 4 25% 33% 16% 2	561
	21st to end	Night	10% 3 20% 38% 25% 4	617
June	1st to 10th	Night	12% 4 21% 44% 19% 1	570
	11th to 20th	Night	12% 3 17% 44% 22% 1	515
	21st to end	Night	11% 2 21% 43% 20% 3	570
July	1st to 10th	Night	9% 2 13% 36% 34% 5%	555
	11th to 20th	Night	9% 3 14% 41% 27% 7%	552
	21st to end	Night	6% 3 13% 44% 30% 4	624
August	1st to 10th	Night	9% 1 13% 43% 28% 5%	567
	11th to 20th	Night	10% 2 14% 35% 33% 5%	564
	21st to end	Night	10% 2 14% 35% 33% 6%	627
September	1st to 10th	Night	12% 4 16% 34% 29% 6%	697
	11th to 20th	Night	10% 3 15% 30% 35% 6%	760
	21st to end	Night	17% 5% 19% 31% 23% 5%	760
October	1st to 10th	Night	15% 6% 25% 30% 19% 5%	760
	11th to 20th	Night	20% 11% 31% 25% 11% 3	760
	21st to end	Night	24% 9% 31% 29% 8%	836
November	1st to 10th	Night	16% 10% 30% 29% 13% 2	755
	11th to 20th	Night	22% 13% 33% 22% 9% 1	760
	21st to end	Night	27% 10% 33% 23% 7%	760
December	1st to 10th	Night	23% 14% 34% 22% 6% 1	760
	11th to 20th	Night	22% 11% 39% 22% 5%	793
	21st to end	Night	30% 10% 33% 23% 4	1045

Page generated at 2024-11-01 22:47:47. Version ac07

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