Kapuskasing
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kapuskasing clear sky chart from 2005-11-06 to 2026-01-17.

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	16% 13% 4 10% 5% 5% 5% 4 5% 6% 28%	127758
	Night	15% 15% 5% 11% 6% 5% 5% 4 5% 5% 24%	124147
Transparency	Day	57% 5% 11% 19% 8% 1	131160
	Night	62% 4 9% 16% 7% 1	128819
Seeing	Day	24% 14% 32% 21% 8% 2	16954
	Night	24% 11% 31% 24% 9% 1	26190

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	9% 22% 9% 20% 9% 6% 5% 4 4 3 9%	3228
	11th to 20th	Day	7% 15% 8% 20% 8% 7% 7% 4 9% 4 12%	3248
	21st to end	Day	8% 17% 7% 15% 7% 8% 7% 6% 6% 4 14%	3982
February	1st to 10th	Day	8% 14% 5% 12% 7% 8% 10% 5% 6% 5% 19%	1715
	11th to 20th	Day	9% 17% 7% 12% 6% 7% 6% 5% 6% 6% 18%	1753
	21st to end	Day	9% 18% 5% 12% 7% 7% 8% 5% 5% 5% 18%	1585
March	1st to 10th	Day	12% 18% 5% 10% 6% 5% 6% 5% 5% 5% 22%	4567
	11th to 20th	Day	14% 19% 5% 14% 8% 6% 5% 3 4 5% 18%	4980
	21st to end	Day	14% 17% 6% 12% 6% 6% 6% 3 3 4 23%	5465
April	1st to 10th	Day	18% 16% 5% 11% 6% 5% 4 3 4 5% 24%	2448
	11th to 20th	Day	19% 15% 5% 9% 5% 4 3 3 4 4 30%	2572
	21st to end	Day	17% 15% 4 7% 4 4 4 3 5% 5% 32%	2600
May	1st to 10th	Day	15% 11% 3 7% 4 4 4 3 4 5% 41%	6016
	11th to 20th	Day	15% 12% 4 8% 5% 5% 4 4 4 6% 33%	6629
	21st to end	Day	21% 12% 2 5% 3 3 3 3 4 5% 38%	7451
June	1st to 10th	Day	22% 8% 3 7% 5% 5% 4 3 5% 7% 31%	3000
	11th to 20th	Day	18% 8% 3 6% 5% 4 4 4 5% 6% 38%	3000
	21st to end	Day	22% 7% 3 7% 5% 4 5% 3 6% 7% 31%	3000
July	1st to 10th	Day	15% 8% 3 8% 5% 6% 5% 4 7% 8% 33%	6819
	11th to 20th	Day	17% 7% 2 7% 4 4 5% 5% 7% 8% 35%	6820
	21st to end	Day	16% 6% 3 6% 4 5% 5% 4 7% 9% 36%	7257
August	1st to 10th	Day	16% 6% 2 6% 4 4 5% 4 5% 8% 38%	4403
	11th to 20th	Day	17% 6% 2 6% 4 3 4 3 5% 7% 42%	4174
	21st to end	Day	16% 7% 3 7% 5% 4 4 4 5% 7% 37%	4675
September	1st to 10th	Day	21% 8% 2 7% 4 5% 4 3 5% 6% 34%	2449
	11th to 20th	Day	24% 10% 3 6% 3 4 4 3 5% 7% 30%	2200
	21st to end	Day	24% 12% 3 6% 4 4 3 2 4 5% 33%	2200
October	1st to 10th	Day	21% 16% 3 6% 4 4 3 3 5% 6% 31%	2051
	11th to 20th	Day	27% 21% 4 7% 3 4 3 3 4 4 19%	1957
	21st to end	Day	24% 24% 6% 9% 4 4 3 2 3 3 16%	1980
November	1st to 10th	Day	22% 19% 7% 12% 5% 5% 3 3 4 4 18%	1701
	11th to 20th	Day	21% 24% 7% 16% 5% 4 3 2 3 3 12%	1680
	21st to end	Day	20% 25% 7% 13% 7% 5% 4 2 4 3 9%	1559
December	1st to 10th	Day	13% 22% 9% 22% 11% 5% 3 2 3 2 8%	2350
	11th to 20th	Day	10% 19% 6% 15% 8% 10% 5% 5% 5% 5% 12%	2691
	21st to end	Day	17% 21% 7% 15% 7% 5% 5% 3 5% 5% 9%	3553
January	1st to 10th	Night	8% 20% 9% 20% 9% 8% 6% 4 4 4 9%	6958
	11th to 20th	Night	8% 18% 9% 19% 9% 6% 6% 6% 7% 4 7%	6789
	21st to end	Night	9% 18% 8% 14% 7% 6% 8% 5% 5% 4 16%	6996
February	1st to 10th	Night	8% 13% 5% 13% 8% 11% 8% 5% 6% 5% 19%	2684
	11th to 20th	Night	9% 16% 6% 13% 9% 7% 6% 4 6% 4 19%	2533
	21st to end	Night	7% 18% 6% 13% 6% 7% 7% 5% 6% 4 21%	2043
March	1st to 10th	Night	19% 15% 5% 10% 6% 6% 5% 3 5% 4 23%	5272
	11th to 20th	Night	16% 18% 6% 14% 8% 5% 4 2 3 3 21%	4979
	21st to end	Night	14% 15% 4 12% 6% 6% 7% 4 4 5% 22%	5467
April	1st to 10th	Night	19% 13% 5% 9% 5% 4 4 4 4 4 28%	1968
	11th to 20th	Night	19% 13% 4 8% 6% 4 4 4 5% 5% 29%	1777
	21st to end	Night	18% 13% 5% 7% 4 3 3 3 4 4 35%	1800
May	1st to 10th	Night	18% 12% 3 6% 4 4 3 3 3 5% 37%	3925
	11th to 20th	Night	14% 12% 3 8% 4 4 4 4 4 6% 36%	3276
	21st to end	Night	19% 10% 2 5% 4 3 4 3 5% 5% 40%	3447
June	1st to 10th	Night	22% 9% 1 6% 4 4 3 3 5% 7% 36%	1400
	11th to 20th	Night	17% 8% 3 6% 5% 3 4 5% 4 7% 39%	1400
	21st to end	Night	22% 6% 2 6% 4 3 4 5% 6% 7% 36%	1400
July	1st to 10th	Night	16% 7% 3 6% 3 3 4 4 6% 8% 41%	3160
	11th to 20th	Night	17% 8% 2 6% 4 4 4 4 6% 8% 36%	3160
	21st to end	Night	14% 6% 2 7% 5% 4 4 4 6% 8% 40%	3616
August	1st to 10th	Night	11% 6% 3 7% 5% 4 5% 4 5% 8% 43%	2751
	11th to 20th	Night	18% 8% 2 5% 3 3 4 3 5% 7% 43%	2875
	21st to end	Night	14% 6% 2 5% 3 4 3 3 4 6% 49%	3223
September	1st to 10th	Night	20% 7% 2 6% 4 5% 4 3 4 6% 40%	1926
	11th to 20th	Night	23% 7% 3 5% 4 4 4 3 5% 7% 35%	2200
	21st to end	Night	22% 9% 2 6% 4 4 4 3 4 6% 37%	2200
October	1st to 10th	Night	21% 12% 3 7% 5% 4 4 3 4 7% 31%	2348
	11th to 20th	Night	26% 19% 5% 6% 4 4 4 3 4 5% 20%	2440
	21st to end	Night	22% 21% 6% 9% 4 3 4 3 4 5% 18%	2860
November	1st to 10th	Night	21% 17% 6% 10% 5% 5% 4 3 5% 6% 17%	2815
	11th to 20th	Night	22% 20% 7% 14% 6% 4 4 3 4 4 14%	2940
	21st to end	Night	21% 23% 8% 14% 7% 4 4 3 3 3 10%	3056
December	1st to 10th	Night	9% 27% 11% 18% 10% 7% 3 3 3 3 7%	5060
	11th to 20th	Night	9% 16% 8% 16% 11% 9% 6% 4 4 4 13%	5736
	21st to end	Night	17% 23% 6% 13% 7% 6% 5% 5% 5% 5% 9%	7667

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	81% 3 6% 6% 3 1	3229
	11th to 20th	Day	72% 3 8% 13% 5%	3275
	21st to end	Day	71% 3 6% 14% 5% 1	3982
February	1st to 10th	Day	64% 5% 7% 18% 6%	1715
	11th to 20th	Day	64% 4 10% 13% 7%	1762
	21st to end	Day	66% 5% 9% 14% 6% 1	1585
March	1st to 10th	Day	64% 4 8% 13% 9% 2	4570
	11th to 20th	Day	69% 3 9% 12% 5%	4980
	21st to end	Day	66% 3 5% 17% 9%	5465
April	1st to 10th	Day	62% 4 7% 19% 8% 1	2448
	11th to 20th	Day	58% 3 7% 22% 9% 1	2572
	21st to end	Day	54% 4 9% 18% 14% 2	2600
May	1st to 10th	Day	47% 4 8% 19% 20% 2	6025
	11th to 20th	Day	52% 6% 11% 17% 11% 3	6633
	21st to end	Day	49% 5% 9% 21% 16% 1	7451
June	1st to 10th	Day	52% 6% 9% 21% 11% 2	3000
	11th to 20th	Day	46% 6% 11% 24% 13% 1	3000
	21st to end	Day	52% 5% 12% 22% 10%	3000
July	1st to 10th	Day	47% 6% 12% 29% 6%	6746
	11th to 20th	Day	45% 6% 18% 22% 8% 1	6739
	21st to end	Day	44% 6% 17% 28% 5%	7048
August	1st to 10th	Day	44% 7% 16% 28% 5%	4388
	11th to 20th	Day	42% 6% 17% 30% 6%	4213
	21st to end	Day	46% 6% 15% 26% 6% 2	4674
September	1st to 10th	Day	51% 5% 14% 22% 7%	2449
	11th to 20th	Day	55% 6% 15% 21% 4	2200
	21st to end	Day	54% 5% 11% 22% 7%	2200
October	1st to 10th	Day	56% 6% 18% 15% 5%	3337
	11th to 20th	Day	63% 3 9% 20% 5%	3160
	21st to end	Day	72% 3 11% 8% 6%	3180
November	1st to 10th	Day	72% 4 9% 11% 3	1701
	11th to 20th	Day	81% 3 7% 8% 1	1680
	21st to end	Day	81% 3 7% 6% 2	1559
December	1st to 10th	Day	86% 2 5% 5% 2	2350
	11th to 20th	Day	74% 4 12% 8% 2	2691
	21st to end	Day	78% 3 6% 12% 1	3553
January	1st to 10th	Night	80% 4 8% 5% 2 1	6958
	11th to 20th	Night	77% 4 8% 8% 3	6837
	21st to end	Night	70% 3 6% 17% 4	6996
February	1st to 10th	Night	65% 5% 9% 14% 6%	2684
	11th to 20th	Night	66% 4 10% 14% 6%	2535
	21st to end	Night	64% 5% 10% 15% 7% 1	2043
March	1st to 10th	Night	65% 3 6% 12% 11% 2	5282
	11th to 20th	Night	70% 3 5% 14% 7% 1	4980
	21st to end	Night	65% 3 6% 14% 11% 1	5467
April	1st to 10th	Night	59% 5% 8% 17% 10% 2	1968
	11th to 20th	Night	56% 5% 8% 17% 12% 2	1777
	21st to end	Night	54% 4 7% 17% 16% 2	1800
May	1st to 10th	Night	50% 4 7% 21% 15% 3	3932
	11th to 20th	Night	49% 6% 9% 23% 12% 1	3277
	21st to end	Night	46% 5% 9% 20% 18% 3	3448
June	1st to 10th	Night	48% 5% 9% 23% 13% 2	1400
	11th to 20th	Night	44% 6% 9% 23% 17% 1	1400
	21st to end	Night	46% 7% 13% 21% 13% 1	1400
July	1st to 10th	Night	40% 5% 15% 32% 7%	3125
	11th to 20th	Night	45% 7% 14% 27% 7%	3118
	21st to end	Night	42% 6% 15% 29% 8%	3511
August	1st to 10th	Night	39% 7% 16% 32% 5%	2742
	11th to 20th	Night	42% 6% 11% 34% 6%	2902
	21st to end	Night	36% 5% 15% 34% 9% 1	3223
September	1st to 10th	Night	47% 6% 14% 24% 9%	1926
	11th to 20th	Night	49% 7% 18% 22% 4	2200
	21st to end	Night	49% 5% 13% 26% 7%	2200
October	1st to 10th	Night	54% 4 12% 24% 7%	3842
	11th to 20th	Night	60% 4 12% 20% 4	3963
	21st to end	Night	67% 5% 14% 11% 3	4610
November	1st to 10th	Night	69% 6% 10% 11% 3	2815
	11th to 20th	Night	76% 5% 9% 8% 2	2940
	21st to end	Night	81% 4 7% 7% 1	3056
December	1st to 10th	Night	85% 3 5% 5% 2	5060
	11th to 20th	Night	76% 4 7% 10% 4	5735
	21st to end	Night	76% 4 7% 9% 3	7667

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% 15% 35% 20% 7% 1	220
	11th to 20th	Day	16% 17% 34% 27% 5% 1	229
	21st to end	Day	18% 15% 31% 26% 8% 1	330
February	1st to 10th	Day	14% 23% 38% 19% 5% 1	300
	11th to 20th	Day	19% 17% 38% 20% 5% 1	300
	21st to end	Day	26% 24% 37% 13% 1	249
March	1st to 10th	Day	17% 18% 44% 17% 3 1	338
	11th to 20th	Day	23% 16% 35% 20% 5% 2	500
	21st to end	Day	24% 15% 37% 19% 5%	550
April	1st to 10th	Day	24% 16% 33% 19% 6% 1	500
	11th to 20th	Day	28% 16% 27% 21% 6% 2	492
	21st to end	Day	27% 18% 26% 19% 9% 2	500
May	1st to 10th	Day	23% 11% 37% 18% 9% 2	503
	11th to 20th	Day	22% 16% 32% 20% 7% 2	656
	21st to end	Day	28% 11% 32% 22% 7% 1	789
June	1st to 10th	Day	26% 13% 33% 19% 8% 1	730
	11th to 20th	Day	22% 15% 33% 20% 8% 2	730
	21st to end	Day	24% 11% 31% 23% 9% 2	730
July	1st to 10th	Day	18% 12% 33% 24% 10% 2	721
	11th to 20th	Day	19% 12% 30% 28% 9% 2	718
	21st to end	Day	17% 7% 35% 26% 11% 4	794
August	1st to 10th	Day	20% 8% 31% 26% 13% 3	631
	11th to 20th	Day	18% 9% 28% 26% 15% 4	519
	21st to end	Day	21% 10% 28% 25% 11% 4	583
September	1st to 10th	Day	27% 14% 30% 20% 8% 2	530
	11th to 20th	Day	30% 8% 32% 18% 9% 3	530
	21st to end	Day	28% 10% 30% 21% 9% 2	530
October	1st to 10th	Day	28% 14% 29% 20% 7% 2	530
	11th to 20th	Day	38% 16% 27% 15% 3 1	487
	21st to end	Day	36% 16% 27% 17% 3	363
November	1st to 10th	Day	33% 21% 30% 12% 3	250
	11th to 20th	Day	34% 23% 25% 15% 4	220
	21st to end	Day	38% 20% 29% 10% 4	220
December	1st to 10th	Day	23% 17% 35% 16% 7% 1	220
	11th to 20th	Day	25% 16% 39% 15% 2 2	220
	21st to end	Day	29% 14% 33% 17% 4 2	242
January	1st to 10th	Night	21% 13% 38% 22% 6% 1	1050
	11th to 20th	Night	23% 12% 31% 26% 7% 1	1031
	21st to end	Night	19% 11% 31% 27% 12% 1	1100
February	1st to 10th	Night	14% 11% 35% 28% 11% 1	884
	11th to 20th	Night	18% 11% 36% 26% 9% 1	783
	21st to end	Night	17% 15% 37% 24% 7% 1	660
March	1st to 10th	Night	20% 13% 36% 23% 8% 1	800
	11th to 20th	Night	25% 15% 31% 23% 7% 1	800
	21st to end	Night	20% 12% 34% 25% 8% 1	880
April	1st to 10th	Night	27% 14% 30% 21% 8% 1	660
	11th to 20th	Night	24% 13% 28% 27% 7% 1	593
	21st to end	Night	23% 13% 30% 25% 9% 1	600
May	1st to 10th	Night	21% 9% 35% 29% 7%	550
	11th to 20th	Night	24% 10% 30% 25% 9% 2	394
	21st to end	Night	24% 8% 31% 29% 7% 1	433
June	1st to 10th	Night	27% 10% 30% 25% 9% 1	400
	11th to 20th	Night	19% 9% 35% 28% 8% 1	400
	21st to end	Night	23% 5% 28% 33% 10% 1	400
July	1st to 10th	Night	19% 7% 31% 30% 11% 1	390
	11th to 20th	Night	16% 7% 33% 32% 11%	388
	21st to end	Night	19% 5% 27% 34% 14% 1	507
August	1st to 10th	Night	14% 6% 29% 34% 15% 2	597
	11th to 20th	Night	18% 6% 25% 32% 16% 2	594
	21st to end	Night	20% 5% 29% 28% 16% 2	660
September	1st to 10th	Night	24% 9% 27% 28% 11% 1	685
	11th to 20th	Night	27% 9% 29% 24% 11%	800
	21st to end	Night	27% 9% 26% 26% 11% 1	800
October	1st to 10th	Night	28% 11% 31% 23% 7% 1	800
	11th to 20th	Night	37% 12% 28% 18% 4 1	800
	21st to end	Night	32% 10% 27% 23% 8%	880
November	1st to 10th	Night	31% 15% 31% 18% 4	820
	11th to 20th	Night	32% 14% 33% 16% 5%	840
	21st to end	Night	33% 14% 31% 16% 6%	956
December	1st to 10th	Night	22% 15% 33% 21% 8% 1	1050
	11th to 20th	Night	21% 13% 37% 21% 6% 2	1050
	21st to end	Night	26% 12% 32% 19% 8% 3	1155

Page generated at 2026-01-14 01:14:31. Version ac07

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