Temiskaming Shores
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Temiskaming Shores clear sky chart from 2005-11-06 to 2025-02-25.

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	15% 12% 4 10% 6% 5% 5% 4 5% 6% 28%	108447
	Night	15% 13% 5% 11% 6% 5% 5% 4 5% 6% 26%	110310
Transparency	Day	55% 7% 11% 19% 7% 1	111995
	Night	58% 6% 11% 16% 8% 1	114927
Seeing	Day	20% 14% 30% 23% 10% 3	15457
	Night	22% 10% 31% 27% 9% 1	24658

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% 19% 8% 17% 10% 8% 5% 3 4 4 10%	3158
	11th to 20th	Day	9% 17% 7% 18% 9% 7% 5% 4 5% 5% 15%	3133
	21st to end	Day	9% 16% 9% 15% 8% 6% 6% 3 5% 6% 18%	4347
February	1st to 10th	Day	6% 15% 7% 15% 9% 8% 6% 4 5% 6% 19%	1800
	11th to 20th	Day	10% 17% 5% 12% 8% 6% 6% 4 6% 6% 20%	1753
	21st to end	Day	12% 16% 5% 11% 7% 6% 5% 4 5% 5% 24%	1449
March	1st to 10th	Day	18% 15% 5% 9% 6% 4 4 4 5% 6% 26%	3382
	11th to 20th	Day	9% 18% 6% 17% 6% 4 4 3 4 4 25%	3480
	21st to end	Day	12% 14% 6% 11% 7% 5% 5% 3 4 4 29%	3815
April	1st to 10th	Day	18% 15% 3 9% 6% 4 4 4 5% 6% 25%	2262
	11th to 20th	Day	20% 11% 3 8% 5% 4 4 4 5% 6% 30%	2419
	21st to end	Day	21% 12% 4 7% 5% 4 3 3 4 6% 32%	2470
May	1st to 10th	Day	18% 10% 3 8% 5% 4 5% 4 6% 7% 31%	4299
	11th to 20th	Day	15% 8% 3 8% 5% 5% 4 4 5% 6% 35%	4398
	21st to end	Day	17% 8% 3 6% 4 4 4 3 5% 7% 38%	4924
June	1st to 10th	Day	18% 9% 3 7% 5% 4 6% 4 6% 8% 29%	2850
	11th to 20th	Day	13% 7% 3 6% 6% 6% 5% 5% 7% 7% 36%	2850
	21st to end	Day	17% 9% 3 7% 6% 6% 4 4 6% 7% 31%	2850
July	1st to 10th	Day	17% 8% 3 7% 4 4 5% 5% 7% 9% 31%	4760
	11th to 20th	Day	12% 6% 2 7% 5% 5% 6% 5% 6% 9% 37%	4760
	21st to end	Day	12% 6% 2 6% 5% 5% 5% 4 7% 8% 40%	4918
August	1st to 10th	Day	12% 7% 3 8% 5% 6% 6% 4 7% 9% 34%	4104
	11th to 20th	Day	18% 7% 2 6% 4 5% 4 4 6% 7% 36%	4044
	21st to end	Day	11% 7% 3 7% 5% 5% 5% 4 5% 8% 40%	4470
September	1st to 10th	Day	16% 7% 2 7% 5% 5% 5% 4 5% 8% 36%	2280
	11th to 20th	Day	18% 8% 3 6% 5% 4 4 3 5% 7% 37%	2180
	21st to end	Day	21% 9% 3 8% 5% 4 4 3 5% 6% 32%	2047
October	1st to 10th	Day	19% 11% 4 8% 5% 4 5% 4 4 6% 31%	1900
	11th to 20th	Day	22% 16% 4 9% 6% 4 5% 3 4 4 22%	1900
	21st to end	Day	24% 16% 4 11% 5% 5% 5% 3 4 5% 17%	2000
November	1st to 10th	Day	19% 14% 5% 11% 6% 4 4 3 5% 5% 24%	1566
	11th to 20th	Day	17% 15% 5% 14% 8% 6% 5% 4 5% 5% 17%	1600
	21st to end	Day	21% 21% 5% 14% 8% 6% 4 3 4 4 11%	1600
December	1st to 10th	Day	12% 25% 9% 16% 8% 5% 4 3 4 3 10%	2582
	11th to 20th	Day	13% 18% 6% 13% 9% 5% 4 3 4 4 21%	2621
	21st to end	Day	18% 19% 7% 18% 7% 5% 4 4 4 4 11%	3476
January	1st to 10th	Night	10% 18% 9% 18% 8% 6% 5% 4 4 4 13%	6808
	11th to 20th	Night	11% 16% 6% 15% 8% 7% 6% 5% 6% 5% 15%	6772
	21st to end	Night	8% 15% 9% 16% 7% 7% 7% 4 5% 5% 17%	6595
February	1st to 10th	Night	10% 15% 5% 12% 10% 7% 6% 4 6% 6% 19%	2600
	11th to 20th	Night	10% 17% 6% 13% 7% 6% 6% 3 4 5% 23%	2533
	21st to end	Night	11% 14% 5% 14% 8% 6% 5% 4 5% 6% 22%	2100
March	1st to 10th	Night	13% 17% 4 9% 5% 5% 4 3 4 5% 32%	3457
	11th to 20th	Night	11% 20% 6% 13% 6% 4 4 3 4 5% 23%	3479
	21st to end	Night	13% 11% 5% 13% 5% 5% 4 3 5% 5% 31%	3817
April	1st to 10th	Night	19% 15% 5% 8% 4 4 3 3 5% 5% 28%	1917
	11th to 20th	Night	18% 12% 3 8% 5% 4 4 3 5% 5% 32%	1725
	21st to end	Night	18% 9% 4 8% 4 4 4 3 5% 6% 35%	1710
May	1st to 10th	Night	15% 11% 3 10% 6% 5% 5% 4 5% 5% 31%	2641
	11th to 20th	Night	15% 7% 3 7% 5% 4 4 4 5% 8% 36%	2495
	21st to end	Night	15% 7% 3 6% 5% 4 5% 4 6% 8% 37%	2650
June	1st to 10th	Night	17% 8% 2 7% 6% 5% 5% 5% 6% 6% 32%	1330
	11th to 20th	Night	18% 5% 2 5% 3 4 4 3 6% 7% 42%	1330
	21st to end	Night	15% 6% 2 7% 4 6% 4 4 6% 9% 37%	1330
July	1st to 10th	Night	16% 6% 2 6% 5% 4 4 4 6% 8% 40%	2210
	11th to 20th	Night	14% 7% 2 7% 5% 5% 5% 5% 6% 7% 37%	2210
	21st to end	Night	15% 6% 2 5% 4 4 4 4 6% 8% 43%	2638
August	1st to 10th	Night	8% 5% 3 8% 6% 6% 6% 5% 5% 10% 40%	2821
	11th to 20th	Night	15% 6% 2 7% 4 4 5% 4 7% 8% 39%	2785
	21st to end	Night	14% 6% 3 6% 4 4 4 3 5% 7% 44%	3153
September	1st to 10th	Night	16% 5% 2 6% 4 4 4 4 6% 7% 42%	1900
	11th to 20th	Night	16% 7% 2 6% 4 4 4 3 4 6% 44%	1998
	21st to end	Night	20% 8% 2 6% 3 4 3 3 5% 8% 39%	2133
October	1st to 10th	Night	19% 11% 3 7% 5% 3 4 3 5% 7% 32%	2280
	11th to 20th	Night	23% 14% 3 9% 5% 4 5% 4 5% 5% 23%	2280
	21st to end	Night	21% 16% 4 9% 5% 4 5% 3 4 6% 23%	2595
November	1st to 10th	Night	17% 14% 4 8% 6% 5% 5% 4 5% 6% 26%	2732
	11th to 20th	Night	17% 16% 6% 12% 7% 6% 6% 2 5% 5% 19%	2800
	21st to end	Night	20% 20% 6% 11% 5% 4 4 4 5% 5% 15%	2800
December	1st to 10th	Night	13% 22% 10% 16% 9% 6% 4 3 3 4 9%	4598
	11th to 20th	Night	14% 17% 6% 14% 8% 6% 5% 4 4 5% 18%	5586
	21st to end	Night	20% 20% 5% 15% 6% 4 4 3 3 4 16%	7502

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	78% 6% 8% 6% 2	3159
	11th to 20th	Day	70% 5% 7% 11% 6%	3160
	21st to end	Day	66% 6% 8% 14% 6%	4347
February	1st to 10th	Day	65% 7% 8% 14% 7%	1800
	11th to 20th	Day	64% 6% 10% 12% 8%	1762
	21st to end	Day	62% 5% 8% 16% 8%	1449
March	1st to 10th	Day	58% 7% 10% 18% 7% 1	3385
	11th to 20th	Day	61% 7% 9% 15% 8%	3480
	21st to end	Day	57% 5% 8% 17% 10% 2	3815
April	1st to 10th	Day	58% 6% 11% 16% 9% 1	2262
	11th to 20th	Day	53% 6% 8% 22% 9% 1	2419
	21st to end	Day	54% 5% 7% 17% 14% 2	2470
May	1st to 10th	Day	48% 8% 11% 22% 9% 1	4311
	11th to 20th	Day	46% 8% 12% 24% 9% 1	4402
	21st to end	Day	44% 7% 12% 19% 16% 2	4924
June	1st to 10th	Day	51% 7% 12% 20% 8% 1	2850
	11th to 20th	Day	44% 8% 12% 22% 13% 1	2850
	21st to end	Day	50% 8% 12% 19% 10% 1	2850
July	1st to 10th	Day	46% 7% 17% 24% 6%	4686
	11th to 20th	Day	39% 8% 17% 28% 8%	4679
	21st to end	Day	41% 7% 13% 32% 7%	4762
August	1st to 10th	Day	43% 9% 16% 27% 6%	4091
	11th to 20th	Day	43% 8% 16% 25% 8% 1	4083
	21st to end	Day	41% 8% 13% 29% 7% 2	4470
September	1st to 10th	Day	45% 9% 15% 23% 8%	2280
	11th to 20th	Day	46% 7% 17% 24% 6%	2180
	21st to end	Day	53% 7% 14% 21% 6%	2047
October	1st to 10th	Day	54% 6% 11% 23% 5%	3160
	11th to 20th	Day	57% 6% 11% 19% 7%	3140
	21st to end	Day	65% 6% 15% 9% 5%	3277
November	1st to 10th	Day	62% 6% 14% 13% 4	1566
	11th to 20th	Day	69% 7% 9% 11% 4	1600
	21st to end	Day	79% 5% 7% 7% 2	1600
December	1st to 10th	Day	79% 6% 7% 6% 2	2582
	11th to 20th	Day	67% 6% 9% 16% 3	2621
	21st to end	Day	76% 5% 7% 9% 3	3476
January	1st to 10th	Night	73% 7% 9% 8% 3	6808
	11th to 20th	Night	68% 7% 9% 10% 7%	6820
	21st to end	Night	67% 6% 6% 12% 8%	6595
February	1st to 10th	Night	64% 6% 9% 12% 8% 1	2600
	11th to 20th	Night	64% 5% 11% 13% 6% 1	2535
	21st to end	Night	62% 7% 9% 14% 8% 1	2100
March	1st to 10th	Night	55% 6% 10% 16% 11% 2	3467
	11th to 20th	Night	63% 6% 11% 13% 7% 1	3480
	21st to end	Night	54% 5% 9% 16% 13% 3	3817
April	1st to 10th	Night	58% 4 9% 17% 11% 1	1917
	11th to 20th	Night	52% 5% 7% 19% 14% 2	1725
	21st to end	Night	50% 6% 9% 16% 17% 2	1710
May	1st to 10th	Night	49% 9% 9% 20% 12% 1	2648
	11th to 20th	Night	43% 7% 12% 23% 13% 1	2496
	21st to end	Night	42% 7% 13% 20% 15% 3	2651
June	1st to 10th	Night	50% 8% 10% 20% 10% 3	1330
	11th to 20th	Night	39% 7% 12% 24% 15% 2	1330
	21st to end	Night	43% 8% 12% 23% 12% 1	1330
July	1st to 10th	Night	41% 7% 14% 26% 11%	2175
	11th to 20th	Night	42% 8% 16% 25% 9% 1	2168
	21st to end	Night	39% 6% 14% 26% 14%	2554
August	1st to 10th	Night	39% 8% 15% 30% 8%	2811
	11th to 20th	Night	41% 8% 16% 29% 6%	2812
	21st to end	Night	39% 7% 15% 26% 10% 2	3153
September	1st to 10th	Night	41% 8% 17% 24% 9% 2	1900
	11th to 20th	Night	43% 6% 17% 26% 8%	1998
	21st to end	Night	45% 7% 16% 24% 8%	2133
October	1st to 10th	Night	48% 7% 12% 23% 10%	3800
	11th to 20th	Night	56% 6% 14% 19% 6%	3779
	21st to end	Night	58% 8% 17% 12% 6%	4268
November	1st to 10th	Night	58% 7% 14% 16% 4	2732
	11th to 20th	Night	67% 7% 12% 11% 4	2800
	21st to end	Night	72% 7% 10% 8% 2	2800
December	1st to 10th	Night	78% 6% 6% 8% 2	4598
	11th to 20th	Night	69% 6% 8% 11% 6%	5585
	21st to end	Night	74% 4 6% 13% 3	7502

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	20% 17% 38% 19% 7% 1	200
	11th to 20th	Day	17% 18% 34% 22% 9% 1	200
	21st to end	Day	20% 11% 35% 23% 10% 1	320
February	1st to 10th	Day	19% 23% 38% 16% 3 1	300
	11th to 20th	Day	18% 20% 38% 19% 5%	300
	21st to end	Day	26% 24% 35% 14% 1	237
March	1st to 10th	Day	17% 17% 40% 21% 6%	427
	11th to 20th	Day	18% 19% 31% 23% 7%	460
	21st to end	Day	23% 17% 34% 19% 7% 1	506
April	1st to 10th	Day	23% 16% 30% 21% 8% 1	460
	11th to 20th	Day	28% 17% 24% 21% 7% 3	452
	21st to end	Day	29% 17% 25% 17% 10% 3	460
May	1st to 10th	Day	24% 11% 29% 23% 10% 3	463
	11th to 20th	Day	22% 11% 32% 21% 11% 3	487
	21st to end	Day	20% 14% 32% 23% 11% 1	577
June	1st to 10th	Day	19% 12% 33% 25% 8% 2	680
	11th to 20th	Day	16% 14% 30% 26% 12% 2	680
	21st to end	Day	19% 9% 26% 30% 12% 3	680
July	1st to 10th	Day	15% 9% 30% 29% 14% 3	671
	11th to 20th	Day	14% 11% 29% 27% 16% 3	668
	21st to end	Day	12% 10% 26% 32% 17% 5%	597
August	1st to 10th	Day	14% 8% 28% 28% 17% 5%	486
	11th to 20th	Day	16% 6% 24% 27% 17% 11%	479
	21st to end	Day	16% 12% 26% 23% 14% 9%	539
September	1st to 10th	Day	19% 8% 29% 25% 15% 4	490
	11th to 20th	Day	19% 9% 23% 30% 12% 6%	490
	21st to end	Day	25% 11% 25% 21% 15% 3	490
October	1st to 10th	Day	26% 14% 27% 20% 12% 2	490
	11th to 20th	Day	28% 19% 31% 17% 4 1	490
	21st to end	Day	29% 17% 33% 16% 3 1	458
November	1st to 10th	Day	33% 17% 37% 11% 4	200
	11th to 20th	Day	23% 22% 31% 19% 6% 1	200
	21st to end	Day	32% 19% 34% 11% 5% 1	200
December	1st to 10th	Day	22% 17% 35% 20% 7%	200
	11th to 20th	Day	24% 17% 33% 17% 9% 2	200
	21st to end	Day	23% 15% 36% 19% 5% 2	220
January	1st to 10th	Night	23% 11% 35% 25% 6% 1	1000
	11th to 20th	Night	24% 11% 32% 26% 7%	1000
	21st to end	Night	18% 9% 30% 30% 12% 1	915
February	1st to 10th	Night	19% 12% 36% 26% 8%	800
	11th to 20th	Night	20% 11% 36% 27% 5%	783
	21st to end	Night	19% 15% 35% 25% 6%	647
March	1st to 10th	Night	19% 13% 38% 25% 5%	760
	11th to 20th	Night	22% 13% 34% 24% 6%	760
	21st to end	Night	20% 12% 35% 26% 6% 1	836
April	1st to 10th	Night	26% 12% 29% 27% 6%	760
	11th to 20th	Night	25% 13% 29% 25% 8%	601
	21st to end	Night	23% 11% 28% 31% 7% 1	570
May	1st to 10th	Night	18% 9% 31% 34% 8%	456
	11th to 20th	Night	21% 8% 29% 32% 9% 1	374
	21st to end	Night	20% 7% 30% 38% 5%	411
June	1st to 10th	Night	19% 9% 29% 36% 7%	380
	11th to 20th	Night	19% 7% 31% 31% 12%	380
	21st to end	Night	17% 5% 27% 35% 15% 1	380
July	1st to 10th	Night	14% 4 30% 41% 10%	370
	11th to 20th	Night	17% 5% 23% 41% 13%	368
	21st to end	Night	14% 6% 22% 42% 15% 1	416
August	1st to 10th	Night	13% 5% 26% 36% 18% 2	563
	11th to 20th	Night	16% 6% 19% 37% 21% 2	564
	21st to end	Night	20% 6% 26% 29% 17% 2	643
September	1st to 10th	Night	19% 6% 29% 31% 15% 1	760
	11th to 20th	Night	19% 7% 27% 26% 18% 1	760
	21st to end	Night	22% 8% 25% 30% 13% 2	760
October	1st to 10th	Night	26% 8% 32% 25% 9% 1	760
	11th to 20th	Night	29% 14% 29% 21% 7% 1	760
	21st to end	Night	31% 10% 31% 23% 5% 1	836
November	1st to 10th	Night	25% 13% 33% 22% 6% 1	780
	11th to 20th	Night	25% 17% 32% 19% 7%	800
	21st to end	Night	32% 13% 32% 19% 4	800
December	1st to 10th	Night	28% 13% 32% 20% 7% 1	805
	11th to 20th	Night	27% 13% 31% 23% 5% 1	1000
	21st to end	Night	28% 12% 28% 24% 8% 1	1100

Page generated at 2025-02-22 06:51:39. Version ac07

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