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 2024-09-29.

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% 11% 4 9% 6% 5% 5% 4 5% 7% 29%	101417
	Night	15% 13% 5% 10% 6% 5% 5% 4 5% 6% 27%	96877
Transparency	Day	53% 7% 12% 20% 7% 1	101161
	Night	57% 7% 11% 17% 8% 1	96754
Seeing	Day	21% 14% 30% 23% 10% 3	15065
	Night	22% 10% 30% 27% 9% 1	24020

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	13% 20% 8% 12% 6% 7% 6% 5% 5% 5% 12%	2208
	11th to 20th	Day	10% 13% 7% 17% 10% 7% 6% 5% 4 5% 16%	2210
	21st to end	Day	12% 18% 10% 16% 7% 5% 5% 3 5% 5% 13%	3032
February	1st to 10th	Day	7% 15% 7% 15% 9% 8% 6% 4 5% 6% 19%	1710
	11th to 20th	Day	10% 17% 5% 12% 8% 6% 6% 4 6% 6% 21%	1663
	21st to end	Day	12% 16% 5% 11% 7% 6% 5% 4 5% 5% 23%	1413
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%	2028
October	1st to 10th	Day	19% 11% 4 8% 5% 4 5% 4 4 6% 30%	1800
	11th to 20th	Day	23% 16% 4 10% 6% 4 5% 3 4 5% 21%	1800
	21st to end	Day	24% 17% 4 11% 5% 5% 5% 3 4 5% 16%	1895
November	1st to 10th	Day	19% 14% 5% 11% 6% 4 4 3 5% 5% 24%	1486
	11th to 20th	Day	17% 15% 5% 13% 8% 6% 5% 4 5% 5% 17%	1520
	21st to end	Day	20% 21% 5% 14% 8% 6% 4 3 4 4 11%	1520
December	1st to 10th	Day	15% 21% 7% 13% 7% 4 5% 3 5% 4 16%	1515
	11th to 20th	Day	15% 19% 6% 9% 7% 5% 5% 3 5% 5% 20%	1671
	21st to end	Day	16% 21% 7% 20% 7% 4 4 2 3 3 12%	2431
January	1st to 10th	Night	12% 17% 8% 15% 8% 7% 5% 4 5% 5% 15%	4748
	11th to 20th	Night	10% 14% 5% 15% 8% 8% 7% 5% 6% 5% 17%	4760
	21st to end	Night	12% 18% 10% 15% 8% 8% 5% 3 4 4 13%	4623
February	1st to 10th	Night	11% 15% 5% 12% 10% 7% 6% 4 5% 6% 19%	2470
	11th to 20th	Night	11% 17% 6% 12% 7% 6% 6% 3 4 5% 23%	2403
	21st to end	Night	11% 14% 5% 13% 8% 6% 5% 4 5% 6% 22%	2041
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% 38%	2120
October	1st to 10th	Night	20% 11% 3 7% 5% 3 4 3 5% 7% 32%	2160
	11th to 20th	Night	24% 14% 3 9% 5% 4 5% 4 5% 5% 23%	2160
	21st to end	Night	22% 16% 4 9% 5% 4 5% 3 4 5% 22%	2458
November	1st to 10th	Night	17% 15% 4 8% 6% 5% 5% 4 5% 6% 27%	2592
	11th to 20th	Night	17% 16% 6% 12% 7% 6% 6% 2 4 5% 19%	2660
	21st to end	Night	20% 19% 6% 11% 5% 4 4 4 5% 5% 15%	2660
December	1st to 10th	Night	16% 21% 7% 14% 7% 6% 5% 3 3 5% 13%	2664
	11th to 20th	Night	16% 19% 6% 13% 8% 6% 5% 3 3 5% 17%	3526
	21st to end	Night	19% 21% 6% 18% 7% 4 4 2 3 4 13%	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	71% 8% 12% 7% 1	2209
	11th to 20th	Day	69% 6% 8% 13% 4	2210
	21st to end	Day	71% 6% 9% 9% 4	3032
February	1st to 10th	Day	64% 7% 9% 14% 6%	1710
	11th to 20th	Day	63% 6% 9% 13% 8%	1672
	21st to end	Day	62% 5% 8% 16% 8%	1413
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%	2028
October	1st to 10th	Day	55% 6% 13% 18% 8% 1	1800
	11th to 20th	Day	65% 7% 9% 14% 4 1	1800
	21st to end	Day	69% 8% 9% 10% 4	1895
November	1st to 10th	Day	63% 6% 14% 12% 4	1486
	11th to 20th	Day	68% 7% 9% 11% 4	1520
	21st to end	Day	78% 5% 8% 7% 2	1520
December	1st to 10th	Day	70% 6% 10% 10% 3	1515
	11th to 20th	Day	65% 7% 9% 15% 3	1671
	21st to end	Day	78% 4 7% 9% 2	2431
January	1st to 10th	Night	69% 9% 12% 8% 2	4748
	11th to 20th	Night	66% 8% 9% 13% 4	4760
	21st to end	Night	73% 7% 7% 9% 4	4623
February	1st to 10th	Night	64% 7% 9% 12% 7%	2470
	11th to 20th	Night	63% 5% 12% 13% 6% 1	2405
	21st to end	Night	62% 6% 9% 14% 8% 1	2041
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%	2120
October	1st to 10th	Night	52% 7% 12% 18% 10%	2160
	11th to 20th	Night	63% 7% 12% 15% 3	2160
	21st to end	Night	63% 6% 11% 13% 5%	2458
November	1st to 10th	Night	57% 7% 14% 16% 4	2592
	11th to 20th	Night	67% 7% 12% 10% 4	2660
	21st to end	Night	71% 7% 11% 8% 2	2660
December	1st to 10th	Night	74% 6% 8% 9% 3	2664
	11th to 20th	Night	70% 6% 9% 11% 4	3525
	21st to end	Night	77% 4 5% 10% 3	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% 17% 38% 17% 7% 1	180
	11th to 20th	Day	17% 17% 36% 21% 8% 1	180
	21st to end	Day	22% 10% 35% 23% 10% 1	288
February	1st to 10th	Day	20% 22% 36% 17% 3 1	270
	11th to 20th	Day	19% 20% 36% 19% 5%	270
	21st to end	Day	27% 25% 35% 12% 1	225
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	26% 11% 25% 20% 15% 3	483
October	1st to 10th	Day	26% 14% 26% 20% 12% 2	450
	11th to 20th	Day	29% 19% 31% 16% 4 1	450
	21st to end	Day	30% 17% 33% 16% 3 1	419
November	1st to 10th	Day	33% 17% 37% 9% 3	180
	11th to 20th	Day	23% 23% 30% 18% 6% 1	180
	21st to end	Day	31% 18% 36% 10% 4 1	180
December	1st to 10th	Day	23% 17% 32% 20% 8%	180
	11th to 20th	Day	26% 16% 34% 14% 7% 2	180
	21st to end	Day	23% 16% 36% 18% 5% 3	198
January	1st to 10th	Night	23% 11% 34% 25% 6% 1	950
	11th to 20th	Night	24% 11% 32% 25% 7%	950
	21st to end	Night	18% 9% 29% 30% 12% 1	870
February	1st to 10th	Night	19% 12% 35% 26% 8%	760
	11th to 20th	Night	21% 11% 35% 27% 5%	743
	21st to end	Night	19% 15% 36% 23% 7%	628
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	756
October	1st to 10th	Night	27% 8% 31% 25% 9% 1	720
	11th to 20th	Night	29% 15% 29% 19% 7% 1	720
	21st to end	Night	32% 10% 30% 23% 5% 1	792
November	1st to 10th	Night	25% 13% 34% 22% 6% 1	740
	11th to 20th	Night	25% 17% 32% 19% 6%	760
	21st to end	Night	32% 13% 32% 19% 4	760
December	1st to 10th	Night	29% 13% 32% 19% 6% 1	764
	11th to 20th	Night	27% 13% 31% 23% 5% 1	950
	21st to end	Night	28% 12% 28% 24% 7% 1	1045

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