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 2024-01-14.

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	19% 12% 4 8% 7% 4 5% 5% 5% 6% 26%	74635
	Night	17% 14% 5% 9% 7% 4 5% 5% 5% 5% 24%	75129
Transparency	Day	59% 5% 11% 18% 7%	74322
	Night	62% 5% 10% 16% 6% 1	74977
Seeing	Day	25% 13% 32% 21% 8% 2	14294
	Night	24% 11% 31% 24% 9% 1	23582

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	11% 18% 7% 13% 10% 5% 7% 7% 6% 5% 11%	1328
	11th to 20th	Day	12% 15% 7% 11% 9% 5% 7% 8% 7% 5% 14%	1312
	21st to end	Day	11% 14% 6% 11% 10% 6% 7% 9% 8% 6% 12%	1584
February	1st to 10th	Day	8% 12% 6% 10% 8% 6% 11% 7% 7% 6% 19%	1544
	11th to 20th	Day	10% 15% 8% 11% 6% 4 7% 7% 7% 6% 19%	1573
	21st to end	Day	9% 16% 5% 12% 8% 5% 9% 6% 5% 5% 19%	1422
March	1st to 10th	Day	12% 12% 4 10% 8% 5% 9% 6% 4 4 26%	1831
	11th to 20th	Day	13% 16% 6% 10% 8% 3 4 4 5% 6% 25%	1980
	21st to end	Day	15% 13% 5% 8% 6% 4 5% 4 4 6% 30%	2178
April	1st to 10th	Day	20% 15% 6% 10% 7% 3 4 3 4 5% 23%	2202
	11th to 20th	Day	19% 14% 5% 8% 5% 3 4 4 4 5% 30%	2312
	21st to end	Day	16% 14% 4 7% 5% 3 4 4 5% 6% 32%	2340
May	1st to 10th	Day	17% 13% 4 8% 7% 4 5% 5% 4 5% 28%	2384
	11th to 20th	Day	20% 10% 4 6% 6% 3 4 4 5% 6% 32%	2593
	21st to end	Day	22% 8% 3 6% 5% 3 5% 5% 5% 7% 32%	2919
June	1st to 10th	Day	23% 8% 3 6% 6% 4 4 4 5% 7% 31%	2700
	11th to 20th	Day	18% 7% 3 6% 5% 3 4 5% 5% 7% 38%	2700
	21st to end	Day	22% 7% 3 6% 6% 3 5% 5% 6% 8% 31%	2700
July	1st to 10th	Day	21% 8% 2 6% 5% 3 5% 5% 6% 8% 33%	2700
	11th to 20th	Day	17% 6% 4 6% 5% 4 5% 6% 6% 7% 33%	2700
	21st to end	Day	19% 6% 3 6% 6% 4 6% 5% 6% 8% 31%	2878
August	1st to 10th	Day	20% 7% 2 6% 6% 3 5% 6% 5% 8% 30%	2422
	11th to 20th	Day	18% 6% 3 5% 6% 3 4 5% 5% 7% 37%	2303
	21st to end	Day	18% 8% 3 7% 7% 4 5% 4 6% 7% 31%	2574
September	1st to 10th	Day	22% 8% 3 6% 5% 4 4 4 5% 6% 34%	2206
	11th to 20th	Day	27% 10% 3 5% 4 3 4 4 5% 6% 28%	1980
	21st to end	Day	26% 12% 3 6% 5% 3 3 3 4 5% 30%	1980
October	1st to 10th	Day	22% 16% 3 5% 4 2 4 3 5% 5% 30%	1847
	11th to 20th	Day	28% 21% 5% 6% 4 3 3 3 4 4 18%	1762
	21st to end	Day	25% 24% 6% 9% 6% 3 3 3 3 3 15%	1782
November	1st to 10th	Day	22% 18% 8% 10% 6% 3 4 4 3 4 18%	1536
	11th to 20th	Day	21% 21% 8% 15% 6% 4 4 3 3 3 12%	1520
	21st to end	Day	20% 22% 7% 12% 9% 4 5% 3 4 3 10%	1411
December	1st to 10th	Day	16% 18% 8% 14% 10% 4 5% 5% 4 4 12%	1330
	11th to 20th	Day	14% 18% 6% 11% 8% 8% 6% 5% 5% 5% 13%	1671
	21st to end	Day	17% 19% 8% 15% 13% 4 6% 4 3 3 8%	2431
January	1st to 10th	Night	12% 19% 7% 13% 11% 5% 7% 7% 4 5% 10%	2838
	11th to 20th	Night	15% 16% 7% 11% 8% 6% 7% 8% 7% 5% 11%	2720
	21st to end	Night	11% 15% 6% 11% 10% 6% 8% 7% 6% 5% 15%	2772
February	1st to 10th	Night	8% 11% 6% 11% 9% 9% 9% 7% 5% 6% 18%	2416
	11th to 20th	Night	10% 16% 7% 10% 10% 5% 6% 5% 6% 5% 20%	2273
	21st to end	Night	6% 18% 7% 11% 8% 5% 7% 6% 6% 5% 21%	1833
March	1st to 10th	Night	12% 11% 5% 10% 9% 5% 7% 6% 5% 5% 25%	2115
	11th to 20th	Night	14% 14% 5% 9% 9% 4 5% 4 4 4 27%	1979
	21st to end	Night	14% 13% 3 8% 6% 4 5% 5% 5% 5% 32%	2178
April	1st to 10th	Night	21% 12% 5% 7% 6% 4 4 5% 4 5% 27%	1772
	11th to 20th	Night	19% 11% 4 8% 6% 3 5% 5% 5% 6% 29%	1597
	21st to end	Night	18% 13% 5% 6% 5% 2 3 4 4 4 36%	1620
May	1st to 10th	Night	16% 12% 4 7% 5% 3 5% 5% 5% 7% 33%	1576
	11th to 20th	Night	20% 8% 4 6% 5% 4 5% 4 4 6% 34%	1298
	21st to end	Night	20% 8% 3 5% 5% 2 5% 4 5% 8% 35%	1357
June	1st to 10th	Night	23% 8% 2 5% 4 3 3 4 5% 7% 36%	1260
	11th to 20th	Night	17% 7% 4 5% 4 2 5% 6% 4 7% 39%	1260
	21st to end	Night	21% 4 2 5% 4 2 5% 6% 6% 7% 37%	1260
July	1st to 10th	Night	19% 5% 3 5% 4 3 4 4 5% 8% 40%	1260
	11th to 20th	Night	14% 7% 3 7% 5% 3 5% 5% 6% 8% 38%	1260
	21st to end	Night	17% 5% 3 6% 6% 3 5% 5% 5% 8% 38%	1439
August	1st to 10th	Night	13% 6% 3 4 6% 4 5% 4 6% 9% 39%	1516
	11th to 20th	Night	16% 7% 3 5% 4 2 5% 4 6% 8% 41%	1598
	21st to end	Night	16% 6% 2 5% 6% 4 4 5% 5% 7% 40%	1782
September	1st to 10th	Night	21% 6% 2 4 5% 3 5% 4 4 6% 41%	1732
	11th to 20th	Night	26% 8% 3 5% 4 3 4 4 5% 6% 32%	1980
	21st to end	Night	24% 9% 3 5% 5% 3 3 4 4 7% 34%	1980
October	1st to 10th	Night	22% 12% 4 6% 5% 3 4 4 4 6% 31%	2112
	11th to 20th	Night	27% 19% 5% 6% 5% 3 5% 4 4 5% 18%	2196
	21st to end	Night	23% 20% 7% 9% 5% 2 4 4 4 5% 17%	2574
November	1st to 10th	Night	22% 16% 7% 9% 7% 3 4 4 4 6% 17%	2540
	11th to 20th	Night	23% 18% 8% 12% 7% 4 4 3 4 3 14%	2660
	21st to end	Night	20% 21% 8% 13% 8% 4 4 3 3 4 11%	2764
December	1st to 10th	Night	11% 22% 10% 14% 9% 5% 5% 4 4 4 12%	2850
	11th to 20th	Night	13% 18% 8% 11% 11% 6% 7% 4 4 4 13%	3526
	21st to end	Night	16% 24% 7% 13% 11% 5% 5% 4 3 4 8%	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	74% 4 8% 10% 4	1329
	11th to 20th	Day	69% 5% 8% 13% 6%	1312
	21st to end	Day	69% 4 7% 14% 6%	1584
February	1st to 10th	Day	63% 6% 8% 17% 6%	1544
	11th to 20th	Day	63% 5% 11% 14% 7%	1582
	21st to end	Day	65% 5% 9% 14% 6% 1	1422
March	1st to 10th	Day	62% 4 10% 15% 9% 1	1834
	11th to 20th	Day	60% 4 9% 17% 9% 1	1980
	21st to end	Day	57% 3 8% 19% 12% 1	2178
April	1st to 10th	Day	64% 4 6% 17% 7% 1	2202
	11th to 20th	Day	58% 4 7% 21% 9% 1	2312
	21st to end	Day	53% 4 9% 17% 14% 2	2340
May	1st to 10th	Day	58% 5% 9% 16% 11% 1	2384
	11th to 20th	Day	53% 5% 9% 23% 10% 1	2597
	21st to end	Day	52% 6% 10% 20% 11% 1	2919
June	1st to 10th	Day	53% 6% 8% 20% 12% 2	2700
	11th to 20th	Day	47% 6% 11% 23% 13% 1	2700
	21st to end	Day	51% 5% 11% 22% 10%	2700
July	1st to 10th	Day	47% 7% 12% 27% 7%	2626
	11th to 20th	Day	46% 8% 15% 25% 6%	2619
	21st to end	Day	51% 8% 15% 23% 4	2718
August	1st to 10th	Day	51% 9% 18% 20% 3	2407
	11th to 20th	Day	45% 8% 17% 21% 9%	2303
	21st to end	Day	51% 7% 15% 21% 6%	2574
September	1st to 10th	Day	51% 6% 14% 21% 7%	2206
	11th to 20th	Day	58% 6% 14% 18% 3	1980
	21st to end	Day	57% 5% 12% 20% 7%	1980
October	1st to 10th	Day	57% 6% 17% 16% 5%	1847
	11th to 20th	Day	71% 5% 7% 14% 3	1762
	21st to end	Day	76% 4 8% 8% 3	1782
November	1st to 10th	Day	72% 5% 10% 11% 3	1536
	11th to 20th	Day	80% 3 7% 8% 1	1520
	21st to end	Day	80% 3 8% 7% 2	1411
December	1st to 10th	Day	76% 4 8% 9% 3	1330
	11th to 20th	Day	72% 5% 9% 11% 3	1671
	21st to end	Day	83% 3 7% 6% 1	2431
January	1st to 10th	Night	76% 5% 7% 10% 2	2838
	11th to 20th	Night	72% 5% 10% 10% 4	2720
	21st to end	Night	70% 5% 7% 14% 4	2772
February	1st to 10th	Night	66% 5% 9% 14% 6%	2416
	11th to 20th	Night	64% 5% 10% 15% 6%	2275
	21st to end	Night	64% 4 10% 14% 7% 1	1833
March	1st to 10th	Night	61% 4 9% 15% 10% 1	2125
	11th to 20th	Night	62% 3 8% 17% 9% 1	1980
	21st to end	Night	54% 4 10% 17% 14% 1	2178
April	1st to 10th	Night	59% 5% 8% 16% 10% 2	1772
	11th to 20th	Night	55% 5% 8% 17% 12% 2	1597
	21st to end	Night	53% 4 8% 17% 17% 2	1620
May	1st to 10th	Night	51% 4 8% 23% 11% 2	1576
	11th to 20th	Night	51% 7% 6% 22% 13% 1	1299
	21st to end	Night	48% 6% 12% 20% 12% 2	1358
June	1st to 10th	Night	49% 5% 9% 23% 12% 3	1260
	11th to 20th	Night	44% 6% 9% 22% 17% 1	1260
	21st to end	Night	45% 7% 13% 21% 13% 1	1260
July	1st to 10th	Night	42% 6% 14% 26% 13%	1225
	11th to 20th	Night	42% 8% 14% 29% 7%	1218
	21st to end	Night	45% 8% 15% 27% 5%	1359
August	1st to 10th	Night	42% 10% 16% 27% 5%	1507
	11th to 20th	Night	42% 7% 17% 26% 8%	1598
	21st to end	Night	43% 6% 17% 27% 6% 1	1782
September	1st to 10th	Night	47% 6% 14% 25% 9%	1732
	11th to 20th	Night	52% 7% 18% 19% 4	1980
	21st to end	Night	51% 6% 14% 24% 6%	1980
October	1st to 10th	Night	56% 5% 13% 20% 5%	2112
	11th to 20th	Night	69% 5% 10% 13% 2	2196
	21st to end	Night	70% 5% 11% 10% 4	2574
November	1st to 10th	Night	69% 6% 10% 11% 3 1	2540
	11th to 20th	Night	76% 5% 9% 8% 2	2660
	21st to end	Night	80% 4 8% 7% 1	2764
December	1st to 10th	Night	78% 4 7% 8% 3	2850
	11th to 20th	Night	75% 4 7% 11% 3	3525
	21st to end	Night	81% 4 7% 5% 2	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	21% 16% 33% 22% 8% 1	180
	11th to 20th	Day	16% 18% 35% 23% 6% 2	180
	21st to end	Day	20% 13% 31% 27% 8% 1	264
February	1st to 10th	Day	14% 24% 37% 19% 5% 1	240
	11th to 20th	Day	23% 17% 36% 18% 5% 1	240
	21st to end	Day	23% 26% 39% 12%	198
March	1st to 10th	Day	16% 18% 42% 19% 4 1	274
	11th to 20th	Day	23% 14% 35% 20% 5% 2	420
	21st to end	Day	23% 14% 36% 21% 5%	462
April	1st to 10th	Day	26% 16% 33% 19% 6% 1	420
	11th to 20th	Day	26% 16% 27% 23% 6% 2	412
	21st to end	Day	23% 19% 26% 20% 9% 2	420
May	1st to 10th	Day	24% 11% 38% 17% 9% 2	423
	11th to 20th	Day	22% 15% 32% 20% 8% 3	562
	21st to end	Day	27% 11% 34% 22% 6% 1	679
June	1st to 10th	Day	27% 12% 32% 20% 8% 1	630
	11th to 20th	Day	23% 14% 33% 20% 9% 2	630
	21st to end	Day	24% 10% 29% 25% 11% 2	630
July	1st to 10th	Day	19% 12% 33% 24% 10% 2	621
	11th to 20th	Day	19% 12% 29% 28% 10% 2	618
	21st to end	Day	18% 6% 34% 26% 12% 4	684
August	1st to 10th	Day	22% 7% 30% 25% 13% 3	541
	11th to 20th	Day	19% 8% 28% 27% 15% 4	439
	21st to end	Day	22% 10% 29% 25% 11% 4	495
September	1st to 10th	Day	25% 14% 29% 21% 8% 2	450
	11th to 20th	Day	34% 10% 31% 16% 7% 2	450
	21st to end	Day	31% 10% 30% 19% 9% 2	450
October	1st to 10th	Day	30% 11% 29% 21% 7% 2	450
	11th to 20th	Day	39% 17% 27% 14% 2 1	412
	21st to end	Day	36% 16% 29% 17% 2	297
November	1st to 10th	Day	33% 19% 32% 12% 3	205
	11th to 20th	Day	32% 26% 25% 13% 4 1	180
	21st to end	Day	36% 22% 29% 9% 4	180
December	1st to 10th	Day	24% 17% 33% 17% 8% 2	180
	11th to 20th	Day	23% 18% 38% 16% 2 3	180
	21st to end	Day	26% 15% 33% 17% 5% 3	198
January	1st to 10th	Night	22% 12% 36% 22% 7% 1	950
	11th to 20th	Night	24% 11% 31% 26% 7% 1	918
	21st to end	Night	19% 10% 30% 27% 12% 1	990
February	1st to 10th	Night	14% 10% 35% 29% 11% 2	796
	11th to 20th	Night	19% 11% 33% 27% 10% 1	703
	21st to end	Night	16% 15% 37% 24% 8% 1	592
March	1st to 10th	Night	19% 13% 35% 24% 9% 1	720
	11th to 20th	Night	24% 14% 31% 24% 7% 1	720
	21st to end	Night	20% 12% 33% 25% 9% 1	792
April	1st to 10th	Night	28% 14% 28% 22% 8% 1	594
	11th to 20th	Night	23% 13% 28% 28% 7% 1	533
	21st to end	Night	22% 12% 30% 25% 9% 1	540
May	1st to 10th	Night	20% 8% 35% 29% 7%	496
	11th to 20th	Night	25% 10% 28% 25% 10% 2	354
	21st to end	Night	24% 8% 31% 30% 6% 1	389
June	1st to 10th	Night	27% 9% 29% 25% 9% 1	360
	11th to 20th	Night	19% 9% 34% 28% 9% 1	360
	21st to end	Night	22% 5% 27% 34% 11% 1	360
July	1st to 10th	Night	20% 7% 31% 30% 11% 1	350
	11th to 20th	Night	16% 5% 35% 32% 12%	348
	21st to end	Night	19% 5% 28% 31% 16% 2	455
August	1st to 10th	Night	15% 6% 28% 34% 16% 2	537
	11th to 20th	Night	18% 5% 25% 33% 16% 2	534
	21st to end	Night	20% 5% 30% 27% 15% 2	594
September	1st to 10th	Night	24% 7% 27% 28% 12% 1	616
	11th to 20th	Night	30% 9% 30% 22% 9%	720
	21st to end	Night	29% 9% 25% 26% 11% 1	720
October	1st to 10th	Night	30% 10% 29% 23% 8% 1	720
	11th to 20th	Night	38% 12% 26% 18% 5% 1	720
	21st to end	Night	32% 11% 26% 23% 8%	792
November	1st to 10th	Night	31% 15% 31% 18% 4	740
	11th to 20th	Night	33% 13% 32% 16% 6%	760
	21st to end	Night	32% 14% 31% 16% 6%	864
December	1st to 10th	Night	23% 14% 33% 20% 8% 1	950
	11th to 20th	Night	22% 14% 36% 21% 6% 2	950
	21st to end	Night	26% 11% 31% 20% 8% 3	1045

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