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 2024-11-25.

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	17% 13% 4 9% 5% 5% 5% 4 5% 6% 28%	101997
	Night	16% 15% 5% 10% 6% 5% 5% 4 5% 5% 25%	97595
Transparency	Day	57% 5% 11% 19% 7%	105423
	Night	61% 5% 10% 17% 6%	102244
Seeing	Day	24% 13% 32% 21% 8% 2	15521
	Night	24% 11% 31% 24% 9% 1	24632

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% 21% 7% 15% 10% 8% 6% 4 6% 4 8%	2208
	11th to 20th	Day	9% 13% 7% 18% 10% 8% 7% 4 5% 4 15%	2255
	21st to end	Day	11% 22% 8% 14% 6% 7% 5% 5% 6% 4 11%	2783
February	1st to 10th	Day	8% 14% 5% 12% 6% 8% 10% 5% 7% 5% 19%	1629
	11th to 20th	Day	9% 17% 7% 12% 6% 7% 7% 5% 7% 6% 19%	1663
	21st to end	Day	9% 17% 5% 13% 7% 7% 8% 5% 5% 5% 19%	1508
March	1st to 10th	Day	12% 14% 4 10% 6% 6% 7% 4 5% 5% 24%	3179
	11th to 20th	Day	11% 20% 6% 15% 9% 4 3 3 4 5% 21%	3480
	21st to end	Day	14% 14% 6% 11% 6% 6% 6% 3 4 5% 24%	3815
April	1st to 10th	Day	18% 17% 5% 11% 6% 4 4 3 4 5% 23%	2325
	11th to 20th	Day	18% 15% 5% 9% 5% 4 3 3 4 4 30%	2442
	21st to end	Day	17% 15% 4 7% 4 4 4 3 5% 5% 32%	2470
May	1st to 10th	Day	16% 13% 3 8% 6% 5% 4 4 5% 5% 32%	4194
	11th to 20th	Day	15% 14% 4 8% 5% 5% 5% 4 5% 7% 30%	4611
	21st to end	Day	22% 11% 2 6% 4 3 4 4 5% 6% 34%	5185
June	1st to 10th	Day	23% 8% 3 7% 5% 5% 4 3 5% 7% 31%	2850
	11th to 20th	Day	18% 7% 2 6% 4 4 4 4 5% 6% 38%	2850
	21st to end	Day	21% 7% 3 7% 5% 4 5% 4 6% 7% 31%	2850
July	1st to 10th	Day	17% 8% 2 7% 5% 5% 5% 4 6% 8% 32%	4760
	11th to 20th	Day	15% 7% 3 7% 4 4 5% 5% 6% 7% 37%	4760
	21st to end	Day	16% 7% 3 6% 4 5% 5% 4 6% 8% 35%	5047
August	1st to 10th	Day	17% 7% 2 6% 4 4 5% 4 5% 8% 37%	4268
	11th to 20th	Day	18% 6% 2 5% 4 3 4 3 5% 7% 42%	4044
	21st to end	Day	16% 7% 3 7% 5% 4 4 3 5% 7% 38%	4532
September	1st to 10th	Day	21% 8% 2 7% 4 4 4 3 5% 6% 35%	2327
	11th to 20th	Day	25% 10% 3 6% 3 4 4 3 5% 7% 29%	2090
	21st to end	Day	25% 12% 3 6% 4 4 3 2 4 5% 32%	2090
October	1st to 10th	Day	21% 16% 3 6% 4 4 3 3 5% 5% 30%	1949
	11th to 20th	Day	28% 21% 5% 7% 3 4 3 3 4 4 19%	1859
	21st to end	Day	25% 24% 6% 10% 5% 4 3 2 3 3 15%	1881
November	1st to 10th	Day	22% 19% 7% 12% 5% 4 3 3 4 4 18%	1618
	11th to 20th	Day	21% 23% 7% 16% 6% 4 3 2 3 3 12%	1600
	21st to end	Day	20% 24% 6% 14% 7% 6% 4 2 4 3 10%	1443
December	1st to 10th	Day	15% 20% 7% 16% 8% 5% 5% 3 4 4 12%	1330
	11th to 20th	Day	14% 20% 6% 13% 6% 9% 6% 4 5% 5% 13%	1671
	21st to end	Day	17% 20% 7% 19% 10% 6% 5% 3 3 3 8%	2431
January	1st to 10th	Night	10% 20% 7% 14% 9% 9% 7% 5% 5% 5% 9%	4748
	11th to 20th	Night	9% 16% 8% 18% 8% 7% 7% 5% 6% 4 10%	4714
	21st to end	Night	12% 21% 8% 13% 7% 6% 6% 5% 4 4 14%	4884
February	1st to 10th	Night	8% 13% 5% 13% 8% 11% 8% 5% 5% 5% 19%	2550
	11th to 20th	Night	10% 16% 6% 12% 8% 7% 6% 4 6% 4 20%	2403
	21st to end	Night	7% 19% 6% 13% 6% 7% 7% 5% 6% 4 20%	1944
March	1st to 10th	Night	20% 14% 4 9% 5% 4 5% 3 5% 5% 26%	3660
	11th to 20th	Night	13% 17% 5% 15% 7% 5% 4 2 3 3 25%	3479
	21st to end	Night	14% 13% 4 12% 7% 7% 6% 4 5% 4 24%	3817
April	1st to 10th	Night	19% 14% 4 8% 5% 4 4 4 4 4 29%	1870
	11th to 20th	Night	19% 12% 3 8% 6% 4 5% 4 5% 5% 29%	1687
	21st to end	Night	18% 13% 5% 7% 4 3 3 3 4 4 35%	1710
May	1st to 10th	Night	18% 12% 3 6% 4 5% 3 3 3 5% 37%	2747
	11th to 20th	Night	16% 12% 4 9% 5% 5% 5% 3 4 6% 33%	2287
	21st to end	Night	18% 9% 2 5% 4 4 5% 3 7% 7% 35%	2402
June	1st to 10th	Night	23% 9% 2 6% 4 4 3 3 5% 7% 35%	1330
	11th to 20th	Night	17% 8% 3 6% 5% 3 4 5% 4 7% 38%	1330
	21st to end	Night	21% 5% 2 6% 3 4 4 5% 6% 7% 37%	1330
July	1st to 10th	Night	15% 6% 3 6% 4 4 4 4 6% 8% 40%	2210
	11th to 20th	Night	15% 8% 2 7% 4 4 5% 4 7% 7% 37%	2210
	21st to end	Night	14% 6% 3 7% 4 4 4 4 6% 8% 40%	2516
August	1st to 10th	Night	11% 6% 3 7% 5% 4 5% 4 5% 8% 42%	2666
	11th to 20th	Night	18% 8% 2 5% 3 3 4 3 4 7% 43%	2785
	21st to end	Night	14% 6% 2 5% 3 3 3 3 4 6% 50%	3124
September	1st to 10th	Night	20% 7% 2 5% 4 4 4 3 4 6% 40%	1830
	11th to 20th	Night	24% 8% 3 5% 4 4 4 3 5% 7% 33%	2090
	21st to end	Night	22% 10% 2 6% 4 4 4 3 4 7% 36%	2090
October	1st to 10th	Night	21% 13% 3 7% 4 4 4 3 4 6% 30%	2230
	11th to 20th	Night	26% 20% 5% 6% 4 4 4 3 4 5% 19%	2318
	21st to end	Night	22% 21% 6% 9% 4 3 4 3 4 5% 17%	2717
November	1st to 10th	Night	22% 17% 6% 10% 5% 4 4 3 4 5% 17%	2678
	11th to 20th	Night	22% 20% 6% 14% 6% 5% 4 3 4 4 14%	2800
	21st to end	Night	21% 23% 7% 14% 7% 5% 4 3 3 3 10%	2827
December	1st to 10th	Night	10% 24% 8% 16% 8% 7% 4 3 4 4 12%	2850
	11th to 20th	Night	13% 19% 8% 13% 9% 8% 6% 3 4 4 13%	3526
	21st to end	Night	16% 24% 6% 16% 8% 6% 5% 3 4 3 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	80% 4 8% 7% 2	2209
	11th to 20th	Day	72% 4 8% 13% 3	2255
	21st to end	Day	75% 4 6% 11% 4	2783
February	1st to 10th	Day	63% 6% 8% 17% 6%	1629
	11th to 20th	Day	64% 5% 11% 14% 7%	1672
	21st to end	Day	65% 5% 9% 14% 6% 1	1508
March	1st to 10th	Day	60% 6% 10% 16% 7%	3182
	11th to 20th	Day	66% 4 10% 15% 5%	3480
	21st to end	Day	63% 3 6% 14% 12% 1	3815
April	1st to 10th	Day	63% 4 7% 19% 7% 1	2325
	11th to 20th	Day	58% 4 7% 21% 9% 1	2442
	21st to end	Day	54% 4 9% 18% 14% 2	2470
May	1st to 10th	Day	53% 5% 10% 19% 11% 1	4206
	11th to 20th	Day	53% 6% 12% 19% 9% 1	4615
	21st to end	Day	51% 6% 10% 21% 11% 1	5185
June	1st to 10th	Day	53% 6% 9% 20% 11% 2	2850
	11th to 20th	Day	46% 6% 11% 24% 13% 1	2850
	21st to end	Day	51% 5% 11% 22% 9%	2850
July	1st to 10th	Day	48% 7% 12% 27% 6%	4686
	11th to 20th	Day	44% 7% 18% 21% 10% 1	4679
	21st to end	Day	45% 7% 17% 26% 5%	4887
August	1st to 10th	Day	44% 7% 16% 28% 5%	4253
	11th to 20th	Day	41% 6% 17% 30% 6%	4083
	21st to end	Day	45% 6% 15% 26% 6% 2	4531
September	1st to 10th	Day	51% 5% 14% 22% 7%	2327
	11th to 20th	Day	55% 6% 15% 19% 4	2090
	21st to end	Day	55% 5% 11% 21% 8%	2090
October	1st to 10th	Day	56% 5% 18% 15% 5%	3235
	11th to 20th	Day	64% 3 8% 20% 5%	3062
	21st to end	Day	72% 3 11% 7% 6%	3081
November	1st to 10th	Day	72% 5% 9% 11% 3	1618
	11th to 20th	Day	80% 3 7% 8% 1	1600
	21st to end	Day	80% 3 7% 7% 2	1443
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% 6% 10% 7% 1	4748
	11th to 20th	Night	75% 5% 9% 9% 2	4714
	21st to end	Night	74% 4 7% 13% 2	4884
February	1st to 10th	Night	65% 5% 9% 14% 6%	2550
	11th to 20th	Night	65% 5% 10% 14% 6%	2405
	21st to end	Night	64% 5% 10% 14% 7% 1	1944
March	1st to 10th	Night	61% 4 9% 16% 9% 1	3670
	11th to 20th	Night	65% 3 6% 18% 7% 1	3480
	21st to end	Night	62% 4 8% 12% 13% 1	3817
April	1st to 10th	Night	58% 5% 8% 17% 10% 2	1870
	11th to 20th	Night	56% 5% 8% 17% 12% 2	1687
	21st to end	Night	53% 4 8% 18% 16% 2	1710
May	1st to 10th	Night	50% 4 8% 23% 14% 1	2754
	11th to 20th	Night	51% 7% 10% 22% 9% 1	2288
	21st to end	Night	46% 6% 10% 23% 13% 1	2403
June	1st to 10th	Night	49% 5% 9% 23% 11% 2	1330
	11th to 20th	Night	44% 6% 10% 22% 16% 1	1330
	21st to end	Night	45% 7% 13% 21% 13% 1	1330
July	1st to 10th	Night	41% 5% 16% 30% 8%	2175
	11th to 20th	Night	44% 7% 14% 25% 10% 1	2168
	21st to end	Night	42% 6% 14% 27% 10%	2436
August	1st to 10th	Night	40% 7% 16% 32% 5%	2657
	11th to 20th	Night	42% 6% 11% 34% 6%	2812
	21st to end	Night	36% 5% 14% 35% 9% 1	3124
September	1st to 10th	Night	47% 6% 14% 24% 9%	1830
	11th to 20th	Night	50% 7% 19% 20% 5%	2090
	21st to end	Night	50% 5% 13% 24% 7%	2090
October	1st to 10th	Night	55% 4 11% 23% 7%	3724
	11th to 20th	Night	60% 4 12% 19% 4	3841
	21st to end	Night	67% 5% 14% 10% 3	4467
November	1st to 10th	Night	69% 6% 10% 11% 3	2678
	11th to 20th	Night	76% 5% 9% 9% 2	2800
	21st to end	Night	80% 4 7% 7% 1	2827
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	15% 16% 35% 26% 6% 2	195
	21st to end	Day	20% 14% 31% 27% 8% 1	297
February	1st to 10th	Day	14% 23% 36% 20% 6% 1	270
	11th to 20th	Day	20% 16% 37% 20% 6% 1	270
	21st to end	Day	25% 25% 37% 12%	225
March	1st to 10th	Day	16% 19% 43% 18% 4 1	306
	11th to 20th	Day	22% 14% 35% 21% 5% 2	460
	21st to end	Day	24% 14% 37% 20% 5%	506
April	1st to 10th	Day	25% 15% 33% 20% 6% 1	460
	11th to 20th	Day	27% 16% 28% 21% 6% 2	452
	21st to end	Day	25% 19% 26% 20% 9% 2	460
May	1st to 10th	Day	24% 11% 37% 17% 9% 2	463
	11th to 20th	Day	22% 16% 32% 20% 7% 2	609
	21st to end	Day	27% 11% 33% 22% 6% 1	734
June	1st to 10th	Day	27% 13% 33% 19% 8% 1	680
	11th to 20th	Day	23% 14% 34% 19% 8% 2	680
	21st to end	Day	23% 10% 30% 25% 10% 2	680
July	1st to 10th	Day	19% 12% 33% 24% 10% 2	671
	11th to 20th	Day	19% 12% 29% 29% 10% 2	668
	21st to end	Day	17% 6% 34% 27% 11% 4	739
August	1st to 10th	Day	21% 8% 30% 26% 12% 3	586
	11th to 20th	Day	19% 8% 27% 27% 15% 4	479
	21st to end	Day	21% 10% 28% 25% 12% 4	539
September	1st to 10th	Day	25% 14% 31% 21% 8% 2	490
	11th to 20th	Day	32% 9% 32% 18% 8% 2	490
	21st to end	Day	30% 9% 30% 21% 9% 2	490
October	1st to 10th	Day	30% 13% 28% 21% 7% 2	490
	11th to 20th	Day	39% 16% 28% 14% 2 1	449
	21st to end	Day	37% 17% 29% 15% 2	330
November	1st to 10th	Day	33% 19% 31% 13% 3	227
	11th to 20th	Day	34% 24% 25% 14% 4 1	200
	21st to end	Day	37% 21% 30% 9% 4	188
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	23% 11% 31% 26% 7% 1	950
	21st to end	Night	19% 10% 30% 27% 12% 1	1045
February	1st to 10th	Night	14% 11% 34% 29% 11% 2	840
	11th to 20th	Night	18% 11% 34% 27% 10% 1	743
	21st to end	Night	16% 15% 37% 23% 7% 1	628
March	1st to 10th	Night	19% 13% 36% 23% 8% 1	760
	11th to 20th	Night	24% 14% 31% 23% 7% 1	760
	21st to end	Night	20% 12% 34% 25% 8% 1	836
April	1st to 10th	Night	27% 14% 29% 21% 8% 1	627
	11th to 20th	Night	24% 13% 28% 27% 7% 1	563
	21st to end	Night	22% 13% 31% 25% 9% 1	570
May	1st to 10th	Night	20% 9% 35% 28% 7%	523
	11th to 20th	Night	24% 10% 28% 26% 9% 2	374
	21st to end	Night	24% 8% 32% 30% 6%	411
June	1st to 10th	Night	27% 9% 29% 24% 9% 1	380
	11th to 20th	Night	19% 9% 35% 27% 9% 1	380
	21st to end	Night	23% 5% 27% 34% 11% 1	380
July	1st to 10th	Night	19% 7% 32% 29% 11% 1	370
	11th to 20th	Night	16% 7% 34% 32% 12%	368
	21st to end	Night	18% 5% 28% 33% 15% 1	481
August	1st to 10th	Night	15% 5% 29% 34% 15% 2	567
	11th to 20th	Night	18% 5% 25% 33% 17% 2	564
	21st to end	Night	20% 5% 30% 28% 16% 2	627
September	1st to 10th	Night	24% 8% 27% 28% 11% 1	651
	11th to 20th	Night	28% 9% 29% 24% 10%	760
	21st to end	Night	28% 9% 25% 26% 11% 1	760
October	1st to 10th	Night	29% 10% 30% 22% 7% 1	760
	11th to 20th	Night	37% 12% 28% 17% 5% 1	760
	21st to end	Night	32% 11% 27% 22% 7%	836
November	1st to 10th	Night	31% 15% 31% 18% 4	780
	11th to 20th	Night	33% 13% 33% 16% 6%	800
	21st to end	Night	33% 14% 31% 15% 6%	883
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

Page generated at 2024-11-22 08:02:23. Version ac07

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