Manitoulin Eco Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Manitoulin Eco Park 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	14% 10% 4 8% 5% 4 4 3 5% 7% 36%	101523
	Night	14% 11% 4 9% 5% 4 4 4 5% 6% 33%	97548
Transparency	Day	46% 7% 13% 22% 11% 1	105037
	Night	50% 7% 12% 20% 10% 1	102122
Seeing	Day	18% 14% 32% 23% 9% 2	15336
	Night	20% 13% 31% 25% 10% 1	24557

By Month

Percentage Cloud Cover NE (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	17% 20% 10% 13% 5% 3 3 2 3 4 20%	2217
	11th to 20th	Day	10% 16% 7% 19% 11% 7% 5% 3 4 4 15%	2530
	21st to end	Day	15% 21% 8% 14% 6% 5% 4 3 4 4 16%	2952
February	1st to 10th	Day	10% 17% 6% 13% 8% 4 4 4 4 6% 24%	1710
	11th to 20th	Day	10% 15% 5% 11% 6% 5% 5% 4 6% 5% 28%	1663
	21st to end	Day	11% 17% 5% 13% 6% 4 5% 4 4 5% 26%	1555
March	1st to 10th	Day	15% 14% 3 7% 4 4 4 4 5% 5% 34%	3263
	11th to 20th	Day	9% 14% 6% 11% 5% 5% 4 4 6% 6% 31%	3480
	21st to end	Day	12% 14% 5% 8% 5% 4 3 4 5% 6% 34%	3815
April	1st to 10th	Day	16% 13% 4 7% 5% 4 4 3 5% 6% 32%	2231
	11th to 20th	Day	19% 9% 3 6% 5% 4 4 3 5% 6% 37%	2442
	21st to end	Day	20% 9% 3 6% 3 3 4 3 5% 8% 36%	2470
May	1st to 10th	Day	16% 7% 2 6% 4 4 4 3 5% 7% 43%	4108
	11th to 20th	Day	13% 7% 3 6% 4 4 4 3 4 7% 45%	4252
	21st to end	Day	13% 7% 2 5% 4 4 4 3 5% 6% 48%	4994
June	1st to 10th	Day	14% 6% 2 6% 4 5% 5% 5% 6% 6% 41%	2850
	11th to 20th	Day	11% 6% 2 5% 4 4 5% 4 6% 9% 43%	2850
	21st to end	Day	15% 7% 3 6% 4 4 4 4 6% 8% 40%	2850
July	1st to 10th	Day	14% 8% 3 7% 5% 4 5% 3 5% 7% 39%	4760
	11th to 20th	Day	8% 5% 2 5% 3 4 4 4 6% 8% 51%	4674
	21st to end	Day	10% 5% 2 5% 3 3 4 3 6% 7% 54%	4661
August	1st to 10th	Day	10% 6% 2 6% 4 5% 5% 4 7% 10% 43%	4104
	11th to 20th	Day	15% 5% 2 6% 4 4 4 3 5% 8% 44%	4044
	21st to end	Day	9% 6% 2 5% 4 4 5% 4 5% 8% 46%	4532
September	1st to 10th	Day	10% 7% 3 7% 5% 4 4 4 6% 9% 42%	2247
	11th to 20th	Day	12% 5% 3 4 4 4 4 4 5% 9% 47%	2090
	21st to end	Day	16% 8% 2 6% 5% 4 4 3 5% 7% 39%	2090
October	1st to 10th	Day	17% 8% 3 7% 5% 4 4 4 5% 6% 37%	1953
	11th to 20th	Day	23% 11% 3 8% 5% 5% 5% 4 5% 6% 26%	1900
	21st to end	Day	25% 13% 4 9% 4 4 4 3 5% 7% 22%	1945
November	1st to 10th	Day	14% 14% 4 10% 5% 5% 4 4 5% 7% 28%	1671
	11th to 20th	Day	17% 15% 4 10% 6% 6% 4 4 6% 7% 21%	1520
	21st to end	Day	21% 21% 5% 10% 6% 5% 5% 3 5% 5% 14%	1520
December	1st to 10th	Day	13% 22% 6% 11% 6% 6% 5% 3 5% 5% 16%	1478
	11th to 20th	Day	17% 19% 5% 11% 7% 6% 5% 4 4 4 18%	1671
	21st to end	Day	24% 25% 5% 11% 6% 4 4 2 4 4 10%	2431
January	1st to 10th	Night	14% 17% 8% 13% 6% 6% 5% 4 5% 5% 18%	4737
	11th to 20th	Night	12% 15% 6% 17% 8% 6% 5% 4 4 5% 17%	4440
	21st to end	Night	14% 18% 8% 13% 7% 5% 4 3 4 5% 19%	4695
February	1st to 10th	Night	11% 15% 5% 12% 7% 5% 5% 4 6% 5% 26%	2470
	11th to 20th	Night	10% 14% 4 11% 7% 5% 5% 3 6% 6% 29%	2403
	21st to end	Night	13% 16% 5% 10% 5% 4 4 3 6% 7% 26%	1898
March	1st to 10th	Night	13% 8% 3 8% 5% 4 4 4 4 6% 41%	3577
	11th to 20th	Night	8% 11% 4 9% 5% 5% 4 4 5% 6% 39%	3479
	21st to end	Night	12% 10% 5% 8% 6% 4 4 3 5% 6% 38%	3817
April	1st to 10th	Night	18% 10% 3 7% 5% 4 4 3 6% 5% 35%	1966
	11th to 20th	Night	17% 9% 2 6% 3 4 4 3 5% 7% 38%	1687
	21st to end	Night	16% 11% 4 9% 5% 4 4 4 5% 5% 34%	1710
May	1st to 10th	Night	15% 7% 2 8% 5% 5% 4 4 5% 6% 39%	2833
	11th to 20th	Night	10% 6% 3 9% 5% 5% 5% 4 7% 8% 39%	2637
	21st to end	Night	13% 8% 2 6% 5% 4 4 4 6% 7% 42%	2570
June	1st to 10th	Night	12% 7% 2 6% 4 4 5% 5% 7% 8% 40%	1330
	11th to 20th	Night	10% 5% 2 4 5% 4 5% 5% 5% 10% 44%	1330
	21st to end	Night	12% 7% 3 6% 5% 4 4 3 7% 7% 42%	1330
July	1st to 10th	Night	11% 7% 2 5% 4 4 3 4 6% 9% 45%	2210
	11th to 20th	Night	10% 5% 1 5% 4 4 4 4 5% 7% 51%	2293
	21st to end	Night	8% 5% 2 7% 4 4 4 3 5% 7% 51%	2898
August	1st to 10th	Night	8% 5% 2 6% 6% 4 4 4 6% 8% 45%	2825
	11th to 20th	Night	13% 4 2 5% 4 5% 4 4 5% 8% 46%	2785
	21st to end	Night	8% 6% 3 6% 4 4 4 3 5% 7% 50%	3124
September	1st to 10th	Night	12% 6% 3 6% 4 3 4 3 4 8% 47%	1910
	11th to 20th	Night	10% 5% 2 5% 4 4 4 3 6% 7% 51%	2090
	21st to end	Night	17% 7% 2 6% 4 4 4 3 5% 7% 41%	2090
October	1st to 10th	Night	17% 7% 3 8% 4 4 4 3 4 6% 38%	2225
	11th to 20th	Night	21% 10% 3 8% 5% 4 5% 4 6% 6% 28%	2280
	21st to end	Night	23% 12% 3 8% 6% 4 4 4 5% 6% 25%	2650
November	1st to 10th	Night	16% 11% 3 8% 5% 4 4 4 5% 7% 31%	2479
	11th to 20th	Night	15% 16% 5% 11% 6% 6% 5% 4 5% 6% 22%	2660
	21st to end	Night	20% 16% 5% 10% 7% 5% 5% 3 5% 6% 19%	2660
December	1st to 10th	Night	16% 19% 5% 12% 6% 5% 5% 4 5% 5% 17%	2698
	11th to 20th	Night	16% 18% 5% 11% 6% 4 5% 3 5% 5% 21%	3526
	21st to end	Night	24% 21% 6% 12% 6% 4 4 2 5% 4 13%	5236

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	69% 6% 11% 10% 3	2218
	11th to 20th	Day	74% 6% 9% 8% 3 1	2530
	21st to end	Day	70% 8% 9% 8% 5% 1	2952
February	1st to 10th	Day	61% 6% 12% 15% 5% 1	1710
	11th to 20th	Day	56% 6% 12% 16% 9% 1	1672
	21st to end	Day	59% 6% 10% 18% 8%	1555
March	1st to 10th	Day	49% 7% 16% 14% 13% 1	3266
	11th to 20th	Day	51% 7% 13% 21% 7% 2	3480
	21st to end	Day	46% 7% 15% 15% 13% 4	3815
April	1st to 10th	Day	51% 5% 13% 18% 12% 1	2231
	11th to 20th	Day	47% 5% 8% 25% 14% 1	2442
	21st to end	Day	46% 6% 11% 20% 14% 3	2470
May	1st to 10th	Day	39% 6% 13% 24% 16% 2	4120
	11th to 20th	Day	38% 7% 12% 26% 15% 1	4256
	21st to end	Day	37% 7% 13% 19% 21% 4	4994
June	1st to 10th	Day	39% 8% 12% 25% 14% 2	2850
	11th to 20th	Day	36% 6% 14% 24% 18% 2	2850
	21st to end	Day	41% 7% 13% 24% 13% 2	2850
July	1st to 10th	Day	43% 6% 14% 23% 12% 1	4686
	11th to 20th	Day	30% 7% 15% 34% 13% 1	4593
	21st to end	Day	30% 5% 11% 34% 20% 1	4513
August	1st to 10th	Day	35% 7% 14% 30% 13% 1	4091
	11th to 20th	Day	38% 6% 17% 28% 11%	4083
	21st to end	Day	34% 6% 15% 34% 10% 1	4531
September	1st to 10th	Day	38% 8% 15% 27% 11% 1	2247
	11th to 20th	Day	35% 6% 17% 30% 11% 1	2090
	21st to end	Day	44% 8% 15% 23% 9%	2090
October	1st to 10th	Day	37% 6% 11% 27% 18%	3239
	11th to 20th	Day	47% 6% 14% 25% 8%	3140
	21st to end	Day	58% 6% 13% 16% 7%	3182
November	1st to 10th	Day	55% 7% 15% 17% 6%	1671
	11th to 20th	Day	61% 8% 13% 12% 5%	1520
	21st to end	Day	71% 7% 10% 9% 3	1520
December	1st to 10th	Day	70% 7% 11% 8% 4	1478
	11th to 20th	Day	67% 7% 10% 13% 2	1671
	21st to end	Day	75% 8% 7% 7% 3	2431
January	1st to 10th	Night	66% 8% 11% 9% 5% 1	4737
	11th to 20th	Night	68% 9% 11% 8% 4	4440
	21st to end	Night	67% 8% 9% 12% 5%	4695
February	1st to 10th	Night	60% 6% 10% 17% 6% 1	2470
	11th to 20th	Night	55% 7% 11% 18% 8% 1	2405
	21st to end	Night	57% 6% 12% 16% 9%	1898
March	1st to 10th	Night	43% 6% 16% 20% 13% 1	3587
	11th to 20th	Night	43% 7% 13% 24% 11% 2	3480
	21st to end	Night	45% 7% 12% 21% 14% 2	3817
April	1st to 10th	Night	50% 5% 9% 21% 14% 1	1966
	11th to 20th	Night	44% 5% 9% 22% 18% 2	1687
	21st to end	Night	51% 5% 8% 18% 15% 4	1710
May	1st to 10th	Night	44% 7% 10% 23% 13% 2	2840
	11th to 20th	Night	39% 7% 12% 24% 16% 2	2638
	21st to end	Night	40% 7% 12% 19% 16% 6%	2571
June	1st to 10th	Night	39% 8% 13% 22% 17% 2	1330
	11th to 20th	Night	34% 7% 13% 23% 21% 2	1330
	21st to end	Night	40% 7% 15% 23% 14% 2	1330
July	1st to 10th	Night	36% 6% 15% 24% 15% 4	2175
	11th to 20th	Night	31% 6% 12% 38% 12% 1	2251
	21st to end	Night	32% 6% 11% 26% 25%	2806
August	1st to 10th	Night	35% 6% 14% 30% 13% 1	2814
	11th to 20th	Night	36% 8% 17% 26% 12% 1	2812
	21st to end	Night	33% 6% 13% 33% 14% 1	3124
September	1st to 10th	Night	34% 7% 13% 29% 13% 2	1910
	11th to 20th	Night	32% 6% 17% 34% 11% 1	2090
	21st to end	Night	44% 7% 15% 24% 11%	2090
October	1st to 10th	Night	36% 5% 9% 32% 17%	3719
	11th to 20th	Night	44% 6% 15% 26% 9%	3779
	21st to end	Night	51% 7% 18% 17% 6%	4363
November	1st to 10th	Night	52% 8% 12% 21% 6%	2479
	11th to 20th	Night	61% 8% 14% 11% 5%	2660
	21st to end	Night	66% 8% 12% 11% 3	2660
December	1st to 10th	Night	69% 8% 9% 11% 2	2698
	11th to 20th	Night	63% 8% 13% 9% 6% 1	3525
	21st to end	Night	73% 7% 11% 6% 3	5236

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	24% 22% 31% 16% 7%	184
	11th to 20th	Day	18% 21% 38% 18% 5%	270
	21st to end	Day	25% 13% 36% 18% 6%	297
February	1st to 10th	Day	23% 25% 34% 13% 4	270
	11th to 20th	Day	21% 22% 40% 14% 2	270
	21st to end	Day	25% 30% 35% 9% 1	225
March	1st to 10th	Day	20% 22% 37% 17% 3 1	351
	11th to 20th	Day	18% 18% 37% 20% 6% 1	460
	21st to end	Day	24% 18% 32% 21% 5% 1	506
April	1st to 10th	Day	23% 14% 33% 23% 7% 1	460
	11th to 20th	Day	28% 20% 25% 15% 9% 3	452
	21st to end	Day	27% 13% 35% 17% 7% 1	460
May	1st to 10th	Day	19% 13% 38% 22% 7% 2	463
	11th to 20th	Day	16% 13% 31% 26% 11% 2	487
	21st to end	Day	13% 10% 36% 26% 13% 2	621
June	1st to 10th	Day	15% 12% 35% 28% 9%	680
	11th to 20th	Day	13% 12% 37% 29% 8% 2	680
	21st to end	Day	18% 11% 32% 26% 10% 2	680
July	1st to 10th	Day	10% 8% 34% 35% 12% 2	671
	11th to 20th	Day	10% 9% 32% 34% 11% 4	668
	21st to end	Day	12% 6% 35% 31% 13% 4	649
August	1st to 10th	Day	13% 7% 27% 32% 16% 5%	486
	11th to 20th	Day	12% 5% 25% 32% 16% 9%	479
	21st to end	Day	13% 10% 29% 27% 15% 6%	539
September	1st to 10th	Day	14% 11% 28% 27% 13% 6%	490
	11th to 20th	Day	12% 9% 26% 30% 15% 7%	490
	21st to end	Day	18% 13% 27% 24% 14% 3	490
October	1st to 10th	Day	21% 18% 25% 24% 10% 2	490
	11th to 20th	Day	22% 22% 35% 14% 6% 1	490
	21st to end	Day	31% 21% 32% 13% 2 1	394
November	1st to 10th	Day	23% 23% 34% 16% 3	266
	11th to 20th	Day	26% 22% 36% 15% 2	180
	21st to end	Day	31% 26% 31% 9% 3	180
December	1st to 10th	Day	30% 20% 29% 16% 4	180
	11th to 20th	Day	30% 26% 31% 11% 2	180
	21st to end	Day	30% 30% 29% 8% 2 1	198
January	1st to 10th	Night	20% 18% 33% 23% 5% 1	950
	11th to 20th	Night	24% 18% 29% 22% 6% 1	950
	21st to end	Night	19% 11% 35% 25% 9% 1	934
February	1st to 10th	Night	18% 18% 39% 21% 4	760
	11th to 20th	Night	17% 18% 35% 24% 6% 1	743
	21st to end	Night	21% 17% 38% 20% 4	628
March	1st to 10th	Night	16% 17% 38% 22% 6%	760
	11th to 20th	Night	17% 15% 38% 22% 8% 1	760
	21st to end	Night	18% 13% 33% 28% 8%	836
April	1st to 10th	Night	24% 12% 35% 24% 4	702
	11th to 20th	Night	23% 12% 31% 23% 10% 2	563
	21st to end	Night	20% 13% 30% 24% 12% 1	570
May	1st to 10th	Night	15% 7% 31% 33% 13% 2	570
	11th to 20th	Night	15% 6% 30% 36% 13%	464
	21st to end	Night	14% 6% 30% 34% 16% 1	411
June	1st to 10th	Night	15% 7% 35% 30% 12% 1	380
	11th to 20th	Night	12% 9% 26% 36% 17% 1	380
	21st to end	Night	15% 6% 24% 38% 16% 2	380
July	1st to 10th	Night	9% 6% 26% 42% 16% 1	370
	11th to 20th	Night	8% 3 26% 40% 20% 2	412
	21st to end	Night	10% 4 25% 37% 23% 1	624
August	1st to 10th	Night	10% 5% 25% 37% 21% 2	567
	11th to 20th	Night	11% 4 21% 31% 29% 4	564
	21st to end	Night	12% 6% 24% 33% 22% 4	627
September	1st to 10th	Night	15% 9% 25% 27% 18% 6%	708
	11th to 20th	Night	11% 7% 26% 31% 18% 7%	760
	21st to end	Night	19% 8% 26% 27% 16% 4	760
October	1st to 10th	Night	20% 14% 26% 26% 12% 1	760
	11th to 20th	Night	26% 17% 29% 19% 8%	760
	21st to end	Night	30% 16% 30% 19% 4 1	836
November	1st to 10th	Night	24% 17% 31% 21% 8% 1	755
	11th to 20th	Night	23% 23% 29% 19% 7%	760
	21st to end	Night	28% 19% 31% 17% 5%	760
December	1st to 10th	Night	29% 22% 30% 13% 6%	798
	11th to 20th	Night	24% 21% 36% 13% 3 1	950
	21st to end	Night	31% 18% 31% 16% 4	1045

Page generated at 2024-11-01 22:47:39. Version ac07

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