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 2024-03-28.

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	14% 8% 4 7% 6% 4 5% 5% 6% 7% 34%	78458
	Night	16% 10% 4 7% 6% 3 5% 5% 5% 7% 33%	81471
Transparency	Day	47% 8% 13% 19% 11% 1	78170
	Night	50% 7% 12% 19% 11% 1	81279
Seeing	Day	16% 8% 26% 28% 17% 5%	14463
	Night	19% 7% 28% 30% 14% 2	24603

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% 14% 7% 10% 9% 4 5% 4 5% 5% 19%	2527
	11th to 20th	Day	15% 15% 6% 12% 9% 6% 8% 7% 6% 5% 11%	2572
	21st to end	Day	27% 16% 7% 10% 8% 4 3 3 4 4 13%	3124
February	1st to 10th	Day	15% 13% 5% 9% 9% 5% 5% 6% 5% 5% 23%	1710
	11th to 20th	Day	15% 9% 5% 10% 9% 6% 6% 4 5% 7% 25%	1792
	21st to end	Day	16% 10% 5% 9% 7% 4 6% 5% 5% 6% 28%	1570
March	1st to 10th	Day	17% 10% 4 7% 7% 4 5% 4 6% 6% 30%	1954
	11th to 20th	Day	14% 10% 3 7% 7% 4 5% 4 5% 7% 34%	2090
	21st to end	Day	19% 9% 4 8% 7% 4 5% 5% 5% 7% 27%	2255
April	1st to 10th	Day	14% 9% 5% 7% 7% 4 5% 5% 5% 6% 33%	2073
	11th to 20th	Day	17% 7% 3 6% 6% 4 5% 6% 5% 7% 33%	2283
	21st to end	Day	18% 8% 4 7% 5% 3 4 5% 5% 7% 36%	2340
May	1st to 10th	Day	15% 7% 3 6% 7% 4 5% 6% 5% 8% 34%	2340
	11th to 20th	Day	17% 7% 3 6% 5% 3 5% 5% 6% 7% 35%	2301
	21st to end	Day	9% 6% 2 5% 5% 4 5% 5% 6% 9% 43%	2531
June	1st to 10th	Day	9% 6% 3 5% 6% 3 5% 6% 7% 9% 41%	2451
	11th to 20th	Day	9% 5% 2 5% 5% 4 6% 6% 7% 9% 42%	2520
	21st to end	Day	8% 4 3 4 6% 4 6% 6% 7% 10% 40%	2520
July	1st to 10th	Day	8% 4 2 5% 4 3 5% 6% 6% 9% 48%	2520
	11th to 20th	Day	9% 4 2 4 6% 3 5% 5% 6% 10% 47%	2516
	21st to end	Day	7% 4 2 5% 5% 4 6% 5% 7% 10% 45%	2547
August	1st to 10th	Day	7% 4 2 4 5% 4 6% 7% 7% 10% 46%	2327
	11th to 20th	Day	9% 4 2 6% 5% 4 6% 7% 7% 9% 40%	2303
	21st to end	Day	9% 4 3 4 4 3 5% 5% 8% 10% 44%	2556
September	1st to 10th	Day	10% 6% 3 6% 5% 3 4 5% 6% 8% 44%	2021
	11th to 20th	Day	8% 4 2 5% 4 3 5% 7% 6% 8% 46%	1980
	21st to end	Day	14% 5% 2 5% 5% 2 5% 5% 6% 8% 42%	1980
October	1st to 10th	Day	12% 5% 3 5% 6% 4 4 4 5% 9% 42%	1926
	11th to 20th	Day	16% 8% 3 6% 6% 3 5% 5% 5% 7% 34%	1800
	21st to end	Day	20% 7% 3 6% 6% 4 5% 5% 5% 7% 32%	1858
November	1st to 10th	Day	10% 7% 4 6% 6% 3 5% 4 6% 9% 40%	1672
	11th to 20th	Day	14% 12% 4 6% 7% 4 5% 5% 5% 6% 33%	1710
	21st to end	Day	19% 11% 4 8% 6% 3 5% 4 6% 7% 29%	1634
December	1st to 10th	Day	16% 13% 7% 11% 7% 4 7% 4 4 6% 21%	1520
	11th to 20th	Day	16% 14% 5% 10% 7% 3 6% 5% 6% 7% 23%	1852
	21st to end	Day	23% 18% 7% 11% 8% 4 4 4 4 5% 11%	2783
January	1st to 10th	Night	16% 15% 6% 9% 7% 3 5% 5% 4 5% 25%	4428
	11th to 20th	Night	15% 18% 7% 11% 7% 3 5% 5% 7% 7% 14%	4379
	21st to end	Night	26% 16% 8% 10% 6% 3 4 3 3 4 16%	4532
February	1st to 10th	Night	17% 12% 6% 10% 8% 4 5% 5% 4 5% 24%	2470
	11th to 20th	Night	15% 12% 5% 8% 8% 4 5% 4 5% 6% 28%	2270
	21st to end	Night	19% 10% 4 8% 7% 3 5% 4 5% 6% 29%	1884
March	1st to 10th	Night	15% 10% 4 7% 6% 4 4 5% 5% 6% 34%	2224
	11th to 20th	Night	14% 9% 3 5% 5% 3 5% 5% 6% 7% 39%	2090
	21st to end	Night	19% 8% 4 7% 5% 4 4 4 5% 6% 35%	2256
April	1st to 10th	Night	15% 9% 4 7% 5% 3 5% 5% 5% 7% 36%	1903
	11th to 20th	Night	18% 7% 3 5% 5% 3 5% 5% 6% 7% 36%	1625
	21st to end	Night	17% 7% 3 5% 5% 3 4 5% 5% 7% 38%	1620
May	1st to 10th	Night	17% 7% 4 7% 6% 4 5% 5% 5% 7% 33%	1620
	11th to 20th	Night	18% 7% 3 7% 5% 2 3 4 5% 6% 39%	1592
	21st to end	Night	9% 4 3 5% 6% 3 5% 5% 6% 10% 45%	1744
June	1st to 10th	Night	11% 3 2 5% 5% 3 5% 6% 6% 9% 44%	1504
	11th to 20th	Night	10% 5% 2 6% 5% 3 5% 6% 6% 8% 43%	1386
	21st to end	Night	10% 4 2 5% 6% 3 4 5% 7% 8% 46%	1440
July	1st to 10th	Night	7% 4 2 4 5% 2 5% 5% 5% 7% 53%	1440
	11th to 20th	Night	7% 4 2 5% 5% 1 4 4 5% 10% 53%	1440
	21st to end	Night	6% 3 2 4 4 3 5% 5% 7% 10% 51%	1771
August	1st to 10th	Night	6% 4 2 4 5% 3 6% 5% 6% 9% 50%	1611
	11th to 20th	Night	8% 4 2 3 5% 3 6% 5% 6% 9% 49%	1598
	21st to end	Night	9% 4 2 5% 4 3 5% 4 6% 8% 51%	1796
September	1st to 10th	Night	10% 5% 2 5% 6% 3 4 5% 6% 7% 47%	1920
	11th to 20th	Night	10% 4 2 4 5% 3 4 4 4 7% 53%	1980
	21st to end	Night	14% 5% 2 6% 5% 3 4 4 5% 6% 45%	1980
October	1st to 10th	Night	14% 5% 3 5% 5% 3 4 4 6% 6% 45%	2034
	11th to 20th	Night	17% 8% 3 6% 6% 4 4 5% 5% 7% 36%	2160
	21st to end	Night	21% 8% 3 6% 5% 4 4 4 5% 7% 34%	2496
November	1st to 10th	Night	13% 7% 2 6% 5% 3 5% 4 5% 7% 43%	2406
	11th to 20th	Night	17% 8% 4 7% 7% 4 5% 5% 6% 8% 31%	2470
	21st to end	Night	21% 12% 5% 6% 5% 3 4 4 5% 7% 28%	2541
December	1st to 10th	Night	18% 13% 6% 8% 8% 3 5% 4 5% 6% 22%	2660
	11th to 20th	Night	15% 13% 4 9% 7% 4 6% 5% 5% 6% 25%	3317
	21st to end	Night	28% 17% 7% 10% 7% 3 4 4 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	54% 7% 13% 20% 6% 1	1954
	11th to 20th	Day	48% 7% 13% 19% 11% 2	2090
	21st to end	Day	55% 7% 10% 20% 6% 1	2255
April	1st to 10th	Day	49% 8% 12% 17% 13%	2073
	11th to 20th	Day	47% 7% 12% 19% 12% 2	2283
	21st to end	Day	47% 7% 14% 19% 12% 2	2340
May	1st to 10th	Day	46% 8% 12% 20% 11% 2	2340
	11th to 20th	Day	46% 9% 12% 17% 14% 2	2305
	21st to end	Day	37% 8% 14% 25% 14% 2	2531
June	1st to 10th	Day	36% 9% 14% 26% 13% 2	2451
	11th to 20th	Day	34% 10% 15% 21% 18% 2	2520
	21st to end	Day	34% 11% 15% 21% 16% 3	2520
July	1st to 10th	Day	31% 8% 12% 25% 20% 3	2451
	11th to 20th	Day	30% 8% 16% 26% 18% 2	2441
	21st to end	Day	32% 9% 15% 24% 17% 2	2405
August	1st to 10th	Day	29% 10% 17% 30% 13%	2314
	11th to 20th	Day	34% 10% 17% 24% 12% 1	2303
	21st to end	Day	31% 9% 16% 24% 18% 2	2556
September	1st to 10th	Day	36% 10% 16% 21% 15% 2	2021
	11th to 20th	Day	31% 10% 14% 30% 14% 1	1980
	21st to end	Day	38% 9% 14% 25% 15%	1980
October	1st to 10th	Day	39% 7% 13% 26% 14% 2	1926
	11th to 20th	Day	48% 7% 12% 21% 12% 1	1800
	21st to end	Day	51% 7% 14% 18% 9%	1858
November	1st to 10th	Day	41% 7% 14% 23% 13% 1	1672
	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	51% 5% 12% 21% 10% 1	2224
	11th to 20th	Night	43% 6% 13% 20% 15% 2	2090
	21st to end	Night	51% 5% 10% 22% 10% 2	2256
April	1st to 10th	Night	47% 6% 10% 21% 14% 2	1903
	11th to 20th	Night	45% 6% 11% 19% 17% 2	1625
	21st to end	Night	44% 5% 13% 19% 15% 3	1620
May	1st to 10th	Night	49% 8% 12% 17% 12% 3	1620
	11th to 20th	Night	46% 5% 9% 20% 17% 2	1593
	21st to end	Night	35% 7% 14% 25% 17% 2	1745
June	1st to 10th	Night	35% 7% 11% 27% 16% 3	1504
	11th to 20th	Night	36% 8% 13% 25% 16% 3	1386
	21st to end	Night	33% 8% 12% 25% 21% 1	1440
July	1st to 10th	Night	30% 7% 12% 28% 20% 3	1400
	11th to 20th	Night	28% 8% 13% 29% 19% 3	1392
	21st to end	Night	26% 8% 19% 23% 21% 4	1672
August	1st to 10th	Night	28% 8% 13% 32% 17% 2	1600
	11th to 20th	Night	30% 9% 15% 30% 14% 3	1598
	21st to end	Night	30% 7% 15% 25% 20% 3	1796
September	1st to 10th	Night	35% 8% 12% 26% 16% 3	1920
	11th to 20th	Night	31% 7% 11% 30% 20% 1	1980
	21st to end	Night	39% 7% 12% 25% 16% 1	1980
October	1st to 10th	Night	38% 7% 12% 22% 20% 1	2034
	11th to 20th	Night	47% 7% 12% 19% 14% 1	2160
	21st to end	Night	50% 5% 12% 21% 10% 1	2496
November	1st to 10th	Night	40% 6% 13% 24% 16% 1	2406
	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	490
April	1st to 10th	Day	15% 10% 34% 32% 9% 1	420
	11th to 20th	Day	21% 13% 29% 22% 10% 4	412
	21st to end	Day	20% 10% 32% 25% 10% 2	420
May	1st to 10th	Day	22% 8% 29% 24% 13% 4	423
	11th to 20th	Day	19% 4 29% 26% 17% 5%	447
	21st to end	Day	12% 2 21% 33% 24% 8%	485
June	1st to 10th	Day	11% 4 23% 39% 19% 3	561
	11th to 20th	Day	12% 4 24% 37% 20% 3	630
	21st to end	Day	10% 4 23% 37% 21% 4	630
July	1st to 10th	Day	8% 3 17% 31% 28% 13%	621
	11th to 20th	Day	10% 3 18% 35% 25% 9%	614
	21st to end	Day	8% 5% 13% 36% 30% 9%	488
August	1st to 10th	Day	9% 3 15% 30% 28% 16%	446
	11th to 20th	Day	12% 3 14% 30% 29% 11%	439
	21st to end	Day	9% 3 17% 28% 31% 12%	495
September	1st to 10th	Day	12% 3 18% 27% 27% 12%	450
	11th to 20th	Day	8% 4 15% 25% 34% 14%	450
	21st to end	Day	16% 8% 20% 25% 21% 10%	450
October	1st to 10th	Day	12% 6% 23% 29% 20% 9%	450
	11th to 20th	Day	18% 14% 31% 25% 11% 2	450
	21st to end	Day	25% 12% 33% 22% 6% 1	373
November	1st to 10th	Day	14% 11% 31% 24% 16% 3	270
	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	22% 9% 31% 29% 9% 1	821
April	1st to 10th	Night	18% 10% 34% 31% 6% 1	643
	11th to 20th	Night	20% 7% 34% 28% 11% 2	533
	21st to end	Night	21% 6% 30% 33% 10%	540
May	1st to 10th	Night	19% 4 31% 31% 13% 1	540
	11th to 20th	Night	21% 4 25% 33% 15% 2	531
	21st to end	Night	10% 3 20% 38% 26% 4	584
June	1st to 10th	Night	12% 3 20% 45% 19% 1	540
	11th to 20th	Night	13% 3 17% 44% 23% 1	486
	21st to end	Night	11% 2 21% 42% 20% 3	540
July	1st to 10th	Night	9% 2 13% 35% 35% 6%	525
	11th to 20th	Night	9% 2 14% 40% 27% 7%	522
	21st to end	Night	6% 3 14% 45% 29% 3	591
August	1st to 10th	Night	9% 1 12% 43% 29% 6%	537
	11th to 20th	Night	10% 2 14% 35% 33% 6%	534
	21st to end	Night	11% 2 14% 36% 32% 6%	594
September	1st to 10th	Night	12% 4 15% 34% 28% 6%	660
	11th to 20th	Night	11% 3 16% 31% 34% 5%	720
	21st to end	Night	16% 5% 19% 31% 24% 5%	720
October	1st to 10th	Night	16% 6% 24% 30% 19% 5%	720
	11th to 20th	Night	21% 11% 32% 25% 10% 2	720
	21st to end	Night	25% 10% 31% 28% 6%	792
November	1st to 10th	Night	16% 10% 31% 29% 13% 2	740
	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 2024-03-24 23:37:02. Version ac07

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