Muskoka District Municipality
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Muskoka District Municipality clear sky chart from 2005-11-06 to 2024-02-05.

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	18% 12% 5% 7% 6% 3 4 4 5% 6% 30%	78433
	Night	18% 13% 5% 8% 6% 3 4 4 4 6% 28%	80385
Transparency	Day	55% 5% 10% 19% 10% 1	78137
	Night	58% 5% 9% 17% 9% 1	80217
Seeing	Day	24% 15% 30% 20% 8% 3	13848
	Night	25% 12% 29% 24% 10% 1	22911

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	16% 22% 13% 12% 5% 3 3 2 2 3 19%	2313
	11th to 20th	Day	12% 17% 10% 16% 12% 5% 4 4 4 3 14%	2627
	21st to end	Day	18% 22% 10% 12% 6% 3 4 2 3 3 17%	3124
February	1st to 10th	Day	13% 19% 9% 15% 7% 4 4 3 4 4 18%	1656
	11th to 20th	Day	15% 15% 6% 13% 6% 4 4 3 4 6% 24%	1573
	21st to end	Day	18% 18% 6% 11% 7% 4 4 4 4 5% 20%	1346
March	1st to 10th	Day	15% 13% 6% 9% 7% 4 4 5% 5% 6% 28%	1977
	11th to 20th	Day	12% 14% 6% 9% 7% 4 4 4 4 6% 29%	1980
	21st to end	Day	18% 11% 4 7% 5% 3 4 4 4 6% 35%	2178
April	1st to 10th	Day	21% 13% 4 7% 5% 4 4 3 4 6% 28%	2137
	11th to 20th	Day	22% 10% 3 6% 5% 3 4 4 4 4 36%	2230
	21st to end	Day	22% 12% 4 5% 5% 3 3 4 4 5% 33%	2340
May	1st to 10th	Day	20% 8% 2 6% 6% 4 4 5% 5% 7% 33%	2381
	11th to 20th	Day	17% 8% 3 5% 6% 3 4 4 5% 7% 38%	2478
	21st to end	Day	15% 5% 2 5% 5% 3 5% 5% 6% 7% 41%	2725
June	1st to 10th	Day	20% 7% 3 5% 5% 3 4 5% 6% 7% 36%	2520
	11th to 20th	Day	16% 6% 3 5% 5% 3 5% 5% 6% 8% 38%	2700
	21st to end	Day	19% 7% 3 6% 5% 3 5% 4 6% 8% 35%	2700
July	1st to 10th	Day	13% 5% 3 5% 5% 3 4 6% 6% 9% 42%	2700
	11th to 20th	Day	14% 6% 3 5% 5% 3 5% 5% 5% 9% 40%	2569
	21st to end	Day	14% 6% 3 5% 6% 3 5% 5% 7% 9% 38%	2652
August	1st to 10th	Day	14% 6% 3 5% 5% 3 6% 5% 5% 9% 39%	2327
	11th to 20th	Day	14% 5% 2 6% 6% 4 6% 5% 6% 8% 39%	2303
	21st to end	Day	15% 6% 3 6% 5% 4 4 6% 6% 8% 36%	2498
September	1st to 10th	Day	16% 6% 2 5% 4 4 5% 6% 5% 8% 39%	2160
	11th to 20th	Day	18% 5% 2 6% 4 3 4 4 6% 7% 41%	2067
	21st to end	Day	20% 9% 3 5% 5% 3 4 6% 4 6% 35%	1936
October	1st to 10th	Day	23% 8% 3 6% 6% 4 4 5% 4 5% 32%	1800
	11th to 20th	Day	29% 11% 3 6% 6% 4 5% 5% 4 6% 22%	1800
	21st to end	Day	33% 12% 4 6% 5% 2 4 4 4 5% 20%	1980
November	1st to 10th	Day	20% 14% 4 6% 5% 3 4 5% 5% 7% 27%	1525
	11th to 20th	Day	19% 17% 6% 8% 7% 3 5% 5% 4 4 22%	1520
	21st to end	Day	23% 20% 5% 7% 6% 4 4 5% 4 5% 17%	1520
December	1st to 10th	Day	19% 26% 8% 8% 5% 3 3 3 4 4 18%	1520
	11th to 20th	Day	20% 23% 6% 10% 5% 3 3 3 3 3 21%	1906
	21st to end	Day	26% 21% 7% 10% 6% 3 3 3 3 3 13%	2665
January	1st to 10th	Night	17% 22% 11% 12% 7% 3 4 3 3 4 13%	4614
	11th to 20th	Night	14% 17% 8% 15% 10% 5% 5% 5% 4 4 13%	4330
	21st to end	Night	17% 19% 9% 12% 7% 4 4 3 3 4 17%	4532
February	1st to 10th	Night	14% 18% 7% 13% 8% 4 6% 5% 4 5% 19%	2399
	11th to 20th	Night	13% 15% 9% 12% 6% 3 5% 4 3 5% 25%	2273
	21st to end	Night	16% 18% 7% 9% 7% 4 4 4 4 4 23%	1907
March	1st to 10th	Night	15% 11% 5% 9% 7% 3 4 4 4 5% 34%	1970
	11th to 20th	Night	14% 13% 6% 8% 6% 3 4 4 4 5% 33%	1979
	21st to end	Night	16% 11% 4 7% 5% 2 3 4 5% 6% 38%	2178
April	1st to 10th	Night	22% 12% 5% 5% 5% 3 4 5% 4 6% 29%	1822
	11th to 20th	Night	19% 10% 3 6% 5% 2 5% 3 4 5% 37%	1696
	21st to end	Night	20% 9% 4 6% 7% 4 4 4 5% 6% 31%	1620
May	1st to 10th	Night	19% 6% 3 5% 4 3 4 5% 6% 7% 38%	1577
	11th to 20th	Night	16% 7% 2 5% 4 3 4 4 5% 7% 43%	1415
	21st to end	Night	11% 5% 2 4 5% 3 6% 5% 5% 10% 44%	1550
June	1st to 10th	Night	16% 8% 3 6% 5% 3 4 5% 6% 8% 37%	1436
	11th to 20th	Night	13% 6% 2 4 3 2 5% 5% 7% 8% 44%	1260
	21st to end	Night	15% 7% 3 5% 6% 3 4 5% 6% 7% 39%	1260
July	1st to 10th	Night	11% 4 2 5% 4 2 4 4 5% 8% 52%	1260
	11th to 20th	Night	13% 6% 2 6% 4 3 4 5% 6% 6% 45%	1389
	21st to end	Night	12% 5% 2 5% 4 3 6% 4 6% 8% 46%	1663
August	1st to 10th	Night	11% 5% 2 4 5% 3 4 5% 6% 8% 46%	1611
	11th to 20th	Night	11% 5% 3 5% 4 3 6% 5% 5% 7% 46%	1598
	21st to end	Night	17% 6% 2 5% 5% 3 4 4 6% 7% 42%	1840
September	1st to 10th	Night	12% 5% 3 5% 5% 3 4 6% 6% 7% 45%	1800
	11th to 20th	Night	14% 6% 2 5% 4 2 4 4 5% 8% 47%	1890
	21st to end	Night	18% 7% 2 5% 5% 3 4 4 5% 5% 41%	2022
October	1st to 10th	Night	21% 8% 3 6% 5% 3 5% 4 4 6% 35%	2160
	11th to 20th	Night	26% 11% 3 7% 5% 3 4 5% 4 6% 26%	2160
	21st to end	Night	28% 14% 5% 7% 5% 4 4 3 4 5% 23%	2376
November	1st to 10th	Night	22% 14% 3 5% 4 3 3 4 5% 5% 31%	2550
	11th to 20th	Night	20% 16% 5% 6% 5% 3 5% 4 5% 5% 26%	2660
	21st to end	Night	24% 18% 7% 7% 6% 3 4 4 4 6% 18%	2660
December	1st to 10th	Night	22% 22% 8% 10% 5% 3 4 4 4 4 14%	2660
	11th to 20th	Night	20% 23% 7% 10% 6% 3 3 3 3 4 17%	3288
	21st to end	Night	26% 22% 7% 11% 6% 3 3 3 3 4 12%	4980

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	74% 3 8% 9% 6%	2314
	11th to 20th	Day	77% 3 6% 7% 6% 1	2627
	21st to end	Day	74% 4 6% 9% 7% 1	3124
February	1st to 10th	Day	73% 3 6% 13% 5% 1	1656
	11th to 20th	Day	64% 4 8% 13% 9% 2	1582
	21st to end	Day	69% 3 7% 13% 7%	1346
March	1st to 10th	Day	58% 6% 11% 14% 10% 1	1980
	11th to 20th	Day	58% 4 8% 18% 11% 2	1980
	21st to end	Day	52% 4 8% 18% 14% 3	2178
April	1st to 10th	Day	58% 4 9% 17% 11% 2	2137
	11th to 20th	Day	52% 5% 6% 23% 13% 1	2230
	21st to end	Day	55% 4 7% 18% 12% 3	2340
May	1st to 10th	Day	50% 5% 8% 21% 13% 3	2381
	11th to 20th	Day	47% 5% 8% 25% 14% 2	2482
	21st to end	Day	42% 6% 13% 22% 14% 3	2725
June	1st to 10th	Day	49% 5% 9% 23% 13% 1	2520
	11th to 20th	Day	43% 7% 10% 22% 16% 2	2700
	21st to end	Day	47% 6% 13% 22% 11% 1	2700
July	1st to 10th	Day	36% 8% 13% 28% 14% 2	2626
	11th to 20th	Day	41% 7% 12% 27% 12% 1	2491
	21st to end	Day	42% 7% 12% 28% 11% 1	2504
August	1st to 10th	Day	41% 9% 13% 24% 11% 1	2314
	11th to 20th	Day	43% 7% 15% 26% 9% 1	2303
	21st to end	Day	44% 8% 14% 23% 10% 1	2498
September	1st to 10th	Day	43% 7% 12% 27% 11% 1	2160
	11th to 20th	Day	42% 6% 13% 28% 11% 1	2067
	21st to end	Day	50% 6% 11% 26% 7%	1936
October	1st to 10th	Day	53% 6% 11% 18% 11% 1	1800
	11th to 20th	Day	64% 6% 10% 13% 7% 1	1800
	21st to end	Day	67% 5% 9% 13% 7%	1980
November	1st to 10th	Day	57% 6% 14% 18% 6%	1525
	11th to 20th	Day	64% 6% 10% 13% 6% 1	1520
	21st to end	Day	71% 5% 9% 10% 4 1	1520
December	1st to 10th	Day	73% 3 8% 11% 4 1	1520
	11th to 20th	Day	71% 4 6% 10% 8% 1	1906
	21st to end	Day	78% 3 5% 11% 4	2665
January	1st to 10th	Night	76% 4 6% 9% 4 1	4614
	11th to 20th	Night	73% 7% 7% 8% 4 1	4330
	21st to end	Night	73% 6% 6% 9% 6% 1	4532
February	1st to 10th	Night	69% 5% 8% 12% 6% 1	2399
	11th to 20th	Night	63% 4 8% 17% 8% 1	2275
	21st to end	Night	66% 4 9% 15% 7% 1	1907
March	1st to 10th	Night	55% 4 12% 15% 13% 2	1980
	11th to 20th	Night	54% 4 10% 19% 11% 2	1980
	21st to end	Night	49% 3 9% 21% 15% 3	2178
April	1st to 10th	Night	56% 5% 8% 18% 11% 2	1822
	11th to 20th	Night	49% 4 6% 23% 15% 2	1696
	21st to end	Night	55% 5% 8% 15% 15% 2	1620
May	1st to 10th	Night	44% 5% 10% 22% 17% 3	1577
	11th to 20th	Night	41% 6% 8% 24% 19% 2	1416
	21st to end	Night	35% 7% 15% 24% 16% 3	1551
June	1st to 10th	Night	46% 6% 10% 21% 14% 2	1436
	11th to 20th	Night	38% 6% 12% 25% 19%	1260
	21st to end	Night	43% 7% 14% 24% 11% 1	1260
July	1st to 10th	Night	30% 7% 13% 27% 21% 3	1225
	11th to 20th	Night	38% 6% 11% 31% 13% 1	1344
	21st to end	Night	36% 7% 13% 29% 14% 1	1571
August	1st to 10th	Night	35% 6% 17% 28% 13% 1	1600
	11th to 20th	Night	36% 8% 15% 27% 12% 1	1598
	21st to end	Night	41% 7% 13% 27% 11% 1	1840
September	1st to 10th	Night	37% 8% 15% 25% 14% 1	1800
	11th to 20th	Night	37% 6% 13% 31% 12%	1890
	21st to end	Night	45% 6% 11% 30% 9%	2022
October	1st to 10th	Night	50% 7% 11% 19% 13%	2160
	11th to 20th	Night	59% 6% 12% 18% 5%	2160
	21st to end	Night	66% 4 9% 13% 8%	2376
November	1st to 10th	Night	55% 5% 11% 21% 8%	2550
	11th to 20th	Night	60% 5% 11% 15% 7% 1	2660
	21st to end	Night	69% 5% 10% 13% 4	2660
December	1st to 10th	Night	74% 5% 7% 10% 4	2660
	11th to 20th	Night	72% 5% 6% 11% 5%	3288
	21st to end	Night	78% 4 6% 9% 4	4980

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	26% 22% 34% 11% 6% 1	180
	11th to 20th	Day	27% 20% 38% 10% 5% 1	213
	21st to end	Day	29% 15% 36% 16% 4	297
February	1st to 10th	Day	30% 30% 32% 5% 2 1	252
	11th to 20th	Day	32% 22% 38% 6% 2	240
	21st to end	Day	39% 27% 29% 5%	202
March	1st to 10th	Day	27% 19% 37% 15% 3	420
	11th to 20th	Day	23% 21% 34% 16% 5% 1	420
	21st to end	Day	31% 16% 32% 15% 6% 1	462
April	1st to 10th	Day	28% 20% 29% 16% 6% 1	420
	11th to 20th	Day	33% 18% 22% 16% 8% 3	412
	21st to end	Day	33% 14% 31% 15% 5% 1	420
May	1st to 10th	Day	29% 12% 29% 21% 6% 3	423
	11th to 20th	Day	24% 15% 29% 19% 9% 4	447
	21st to end	Day	19% 15% 31% 21% 11% 2	485
June	1st to 10th	Day	23% 14% 32% 24% 6% 2	450
	11th to 20th	Day	18% 14% 29% 25% 10% 2	630
	21st to end	Day	20% 13% 35% 22% 7% 2	630
July	1st to 10th	Day	12% 10% 32% 31% 12% 3	621
	11th to 20th	Day	17% 11% 24% 29% 14% 4	490
	21st to end	Day	14% 13% 31% 28% 10% 5%	488
August	1st to 10th	Day	15% 7% 28% 29% 14% 7%	446
	11th to 20th	Day	16% 5% 26% 29% 15% 9%	439
	21st to end	Day	18% 9% 30% 24% 14% 6%	495
September	1st to 10th	Day	16% 10% 31% 23% 14% 7%	450
	11th to 20th	Day	18% 8% 27% 26% 17% 5%	450
	21st to end	Day	22% 15% 24% 26% 11% 3	450
October	1st to 10th	Day	28% 13% 24% 19% 12% 4	450
	11th to 20th	Day	29% 17% 33% 15% 4 1	450
	21st to end	Day	38% 17% 28% 14% 3	495
November	1st to 10th	Day	36% 16% 30% 15% 2	203
	11th to 20th	Day	29% 26% 29% 12% 4	180
	21st to end	Day	36% 21% 34% 7% 2	180
December	1st to 10th	Day	33% 19% 32% 13% 2 1	180
	11th to 20th	Day	39% 27% 18% 13% 2 1	180
	21st to end	Day	37% 24% 28% 8% 2 1	198
January	1st to 10th	Night	30% 17% 30% 18% 4	868
	11th to 20th	Night	30% 17% 29% 19% 4 1	760
	21st to end	Night	22% 11% 36% 22% 8% 1	836
February	1st to 10th	Night	25% 20% 33% 19% 3	739
	11th to 20th	Night	23% 18% 34% 18% 6%	703
	21st to end	Night	29% 18% 28% 20% 5%	592
March	1st to 10th	Night	23% 17% 35% 21% 3	720
	11th to 20th	Night	24% 16% 34% 20% 5% 1	720
	21st to end	Night	22% 13% 30% 26% 8% 1	792
April	1st to 10th	Night	28% 14% 31% 21% 6%	720
	11th to 20th	Night	26% 13% 29% 21% 10% 1	632
	21st to end	Night	25% 11% 29% 25% 9%	540
May	1st to 10th	Night	23% 5% 26% 32% 12% 2	497
	11th to 20th	Night	18% 11% 32% 29% 11%	354
	21st to end	Night	12% 8% 34% 33% 13% 1	389
June	1st to 10th	Night	20% 6% 32% 32% 11%	360
	11th to 20th	Night	16% 9% 24% 36% 15%	360
	21st to end	Night	19% 6% 24% 38% 14%	360
July	1st to 10th	Night	12% 4 21% 43% 19% 1	350
	11th to 20th	Night	16% 4 26% 34% 19% 1	348
	21st to end	Night	11% 5% 25% 37% 21% 1	483
August	1st to 10th	Night	14% 4 17% 38% 25% 2	537
	11th to 20th	Night	12% 4 19% 37% 24% 3	534
	21st to end	Night	18% 6% 25% 29% 20% 2	652
September	1st to 10th	Night	16% 7% 26% 32% 17% 3	720
	11th to 20th	Night	16% 6% 26% 29% 19% 4	720
	21st to end	Night	21% 8% 23% 29% 17% 3	720
October	1st to 10th	Night	25% 11% 27% 23% 13% 1	720
	11th to 20th	Night	31% 12% 30% 19% 8% 1	720
	21st to end	Night	35% 15% 27% 19% 4	792
November	1st to 10th	Night	33% 11% 24% 25% 7% 1	740
	11th to 20th	Night	29% 16% 28% 19% 7%	760
	21st to end	Night	34% 14% 28% 20% 4	760
December	1st to 10th	Night	35% 18% 29% 14% 4	760
	11th to 20th	Night	32% 17% 34% 13% 3 1	760
	21st to end	Night	35% 14% 29% 19% 3	893

Page generated at 2024-02-02 05:20:32. Version ac07

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