Camping Portage (Laverendrie)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camping Portage (Laverendrie) clear sky chart from 2005-11-06 to 2026-08-15.

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% 5% 10% 6% 5% 5% 4 5% 6% 26%	145195
	Night	16% 14% 5% 11% 6% 5% 5% 3 4 5% 24%	136671
Transparency	Day	58% 5% 10% 18% 8% 1	148674
	Night	62% 4 9% 16% 8% 1	141284
Seeing	Day	25% 16% 32% 18% 7% 2	16977
	Night	25% 14% 30% 22% 8% 1	25489

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% 17% 8% 20% 10% 7% 6% 3 4 4 8%	4661
	11th to 20th	Day	9% 19% 10% 21% 8% 5% 4 4 5% 4 12%	4650
	21st to end	Day	7% 13% 7% 20% 9% 6% 7% 5% 6% 5% 16%	5304
February	1st to 10th	Day	7% 19% 7% 15% 11% 8% 5% 3 4 5% 16%	1890
	11th to 20th	Day	10% 19% 8% 15% 7% 5% 5% 4 4 4 19%	1843
	21st to end	Day	14% 19% 6% 12% 7% 5% 4 4 4 5% 19%	1653
March	1st to 10th	Day	20% 17% 5% 13% 5% 4 4 3 4 4 22%	4670
	11th to 20th	Day	15% 15% 6% 14% 7% 5% 4 3 4 5% 23%	5090
	21st to end	Day	15% 13% 6% 10% 6% 6% 4 2 3 4 29%	5815
April	1st to 10th	Day	21% 17% 4 9% 4 3 4 3 4 5% 27%	2520
	11th to 20th	Day	23% 13% 4 8% 4 4 3 2 4 5% 30%	2498
	21st to end	Day	21% 13% 4 7% 5% 4 3 3 4 5% 32%	2788
May	1st to 10th	Day	18% 13% 4 8% 5% 5% 5% 4 6% 7% 26%	8237
	11th to 20th	Day	18% 11% 3 9% 6% 6% 5% 4 5% 6% 27%	8221
	21st to end	Day	20% 11% 4 8% 4 4 4 4 5% 6% 31%	9060
June	1st to 10th	Day	22% 10% 3 7% 5% 5% 5% 4 5% 6% 28%	2940
	11th to 20th	Day	16% 7% 3 8% 5% 4 6% 5% 7% 8% 32%	3066
	21st to end	Day	19% 9% 3 8% 6% 5% 5% 4 7% 8% 27%	3150
July	1st to 10th	Day	15% 7% 3 7% 5% 5% 5% 4 7% 10% 33%	8759
	11th to 20th	Day	14% 6% 2 6% 4 5% 5% 5% 7% 9% 37%	8280
	21st to end	Day	15% 7% 3 7% 5% 5% 5% 4 7% 9% 34%	8993
August	1st to 10th	Day	15% 7% 3 9% 7% 5% 6% 4 6% 7% 31%	4646
	11th to 20th	Day	17% 8% 3 7% 4 5% 5% 4 6% 7% 33%	4226
	21st to end	Day	15% 7% 3 7% 4 5% 5% 4 6% 8% 36%	4393
September	1st to 10th	Day	18% 8% 3 7% 5% 4 4 3 5% 6% 35%	2400
	11th to 20th	Day	18% 8% 3 6% 3 5% 5% 3 4 6% 39%	2400
	21st to end	Day	22% 11% 3 6% 4 4 4 3 5% 7% 33%	2109
October	1st to 10th	Day	21% 13% 4 7% 4 4 4 3 4 6% 30%	2000
	11th to 20th	Day	28% 18% 4 9% 3 3 3 2 4 5% 20%	2000
	21st to end	Day	28% 18% 5% 8% 4 4 5% 2 4 5% 17%	2048
November	1st to 10th	Day	18% 22% 7% 9% 3 4 3 3 4 4 23%	1731
	11th to 20th	Day	17% 19% 8% 16% 7% 4 4 2 3 3 15%	1680
	21st to end	Day	23% 23% 9% 15% 8% 4 3 2 2 3 8%	1680
December	1st to 10th	Day	15% 27% 10% 16% 8% 6% 3 2 3 3 7%	2680
	11th to 20th	Day	16% 20% 6% 15% 11% 8% 4 3 2 2 13%	3066
	21st to end	Day	16% 22% 9% 13% 9% 4 4 4 3 4 13%	4048
January	1st to 10th	Night	10% 19% 10% 19% 9% 6% 5% 3 3 3 11%	8234
	11th to 20th	Night	10% 19% 8% 18% 10% 7% 6% 4 4 4 10%	8235
	21st to end	Night	5% 14% 9% 16% 9% 8% 7% 5% 7% 4 15%	8862
February	1st to 10th	Night	10% 15% 6% 12% 10% 8% 6% 5% 5% 5% 19%	2730
	11th to 20th	Night	11% 18% 6% 13% 10% 6% 5% 4 4 5% 17%	2663
	21st to end	Night	11% 17% 6% 12% 9% 6% 6% 3 5% 5% 20%	2152
March	1st to 10th	Night	17% 20% 6% 10% 6% 4 4 3 4 4 22%	5372
	11th to 20th	Night	15% 16% 5% 13% 7% 5% 5% 4 4 6% 20%	5089
	21st to end	Night	14% 12% 5% 12% 6% 6% 5% 4 4 5% 27%	5359
April	1st to 10th	Night	20% 15% 6% 10% 5% 3 3 3 4 5% 28%	2100
	11th to 20th	Night	17% 12% 4 9% 5% 3 5% 3 5% 5% 33%	2075
	21st to end	Night	22% 12% 3 7% 4 4 3 3 5% 5% 32%	1847
May	1st to 10th	Night	17% 12% 4 7% 5% 5% 5% 4 6% 7% 30%	4660
	11th to 20th	Night	19% 8% 3 8% 4 4 4 3 5% 6% 36%	4639
	21st to end	Night	18% 11% 4 8% 5% 5% 4 4 5% 6% 32%	5114
June	1st to 10th	Night	18% 10% 3 7% 5% 5% 5% 3 6% 7% 31%	1680
	11th to 20th	Night	18% 9% 3 7% 4 4 5% 4 4 7% 36%	1547
	21st to end	Night	18% 7% 3 6% 5% 4 4 4 6% 8% 35%	1470
July	1st to 10th	Night	15% 8% 3 8% 5% 6% 5% 4 5% 8% 32%	4219
	11th to 20th	Night	13% 7% 3 6% 6% 5% 5% 5% 6% 8% 37%	4680
	21st to end	Night	15% 8% 3 7% 4 4 4 3 5% 6% 40%	5084
August	1st to 10th	Night	13% 7% 2 7% 4 4 5% 4 6% 8% 39%	2720
	11th to 20th	Night	18% 9% 3 7% 4 4 4 4 5% 5% 37%	2911
	21st to end	Night	18% 7% 2 7% 4 4 5% 4 6% 8% 36%	3472
September	1st to 10th	Night	17% 9% 2 6% 4 4 4 4 5% 7% 40%	2000
	11th to 20th	Night	19% 7% 2 7% 3 4 4 3 4 6% 41%	2000
	21st to end	Night	21% 9% 3 6% 4 3 3 3 4 6% 37%	2286
October	1st to 10th	Night	21% 11% 4 6% 3 4 4 4 5% 6% 32%	2400
	11th to 20th	Night	25% 17% 3 9% 4 4 3 3 3 5% 24%	2400
	21st to end	Night	26% 19% 5% 8% 5% 3 3 2 4 5% 20%	2791
November	1st to 10th	Night	19% 18% 6% 10% 5% 4 3 3 4 4 24%	2782
	11th to 20th	Night	19% 19% 6% 14% 5% 4 4 3 4 5% 16%	2940
	21st to end	Night	23% 22% 8% 14% 7% 4 3 2 3 3 11%	2940
December	1st to 10th	Night	16% 22% 8% 19% 10% 6% 4 3 2 3 8%	4720
	11th to 20th	Night	20% 18% 5% 14% 8% 5% 5% 3 3 3 15%	5348
	21st to end	Night	19% 21% 6% 14% 9% 4 5% 2 3 4 13%	7150

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% 7% 3	4662
	11th to 20th	Day	77% 2 4 9% 7%	4680
	21st to end	Day	68% 4 6% 13% 10%	5304
February	1st to 10th	Day	71% 4 5% 12% 7% 1	1890
	11th to 20th	Day	69% 3 7% 12% 9%	1852
	21st to end	Day	67% 3 6% 14% 9%	1653
March	1st to 10th	Day	67% 3 5% 12% 11% 2	4673
	11th to 20th	Day	64% 3 9% 14% 8% 1	5090
	21st to end	Day	59% 4 5% 18% 13% 2	5815
April	1st to 10th	Day	60% 3 8% 15% 11% 2	2520
	11th to 20th	Day	57% 3 7% 20% 11% 1	2498
	21st to end	Day	56% 4 7% 16% 15% 2	2788
May	1st to 10th	Day	55% 6% 7% 19% 9% 3	8249
	11th to 20th	Day	55% 6% 10% 20% 8%	8225
	21st to end	Day	53% 5% 9% 18% 14% 1	9061
June	1st to 10th	Day	55% 6% 9% 19% 11% 1	2940
	11th to 20th	Day	46% 7% 12% 23% 11% 1	3066
	21st to end	Day	52% 8% 12% 19% 9%	3150
July	1st to 10th	Day	44% 6% 13% 26% 10%	8688
	11th to 20th	Day	40% 6% 18% 26% 8% 1	8205
	21st to end	Day	45% 7% 15% 25% 8%	8795
August	1st to 10th	Day	50% 6% 13% 25% 5%	4632
	11th to 20th	Day	48% 6% 16% 23% 7%	4265
	21st to end	Day	44% 6% 11% 28% 10% 1	4393
September	1st to 10th	Day	48% 5% 12% 22% 12% 1	2400
	11th to 20th	Day	45% 5% 17% 24% 9% 1	2400
	21st to end	Day	51% 6% 14% 20% 9%	2109
October	1st to 10th	Day	57% 5% 10% 23% 5% 1	3260
	11th to 20th	Day	60% 4 14% 16% 6% 1	3240
	21st to end	Day	68% 5% 13% 9% 4	3286
November	1st to 10th	Day	64% 3 12% 14% 6%	1731
	11th to 20th	Day	75% 3 8% 10% 5%	1680
	21st to end	Day	83% 4 6% 4 3	1680
December	1st to 10th	Day	83% 3 6% 7% 1	2680
	11th to 20th	Day	79% 3 3 11% 3	3066
	21st to end	Day	77% 2 5% 13% 3	4048
January	1st to 10th	Night	79% 2 8% 8% 3	8234
	11th to 20th	Night	79% 3 6% 7% 5%	8280
	21st to end	Night	70% 4 5% 13% 9%	8862
February	1st to 10th	Night	66% 5% 7% 14% 7% 1	2730
	11th to 20th	Night	68% 4 7% 12% 7% 1	2665
	21st to end	Night	64% 4 8% 15% 8% 1	2152
March	1st to 10th	Night	66% 3 7% 10% 12% 3	5382
	11th to 20th	Night	65% 4 11% 12% 7% 1	5090
	21st to end	Night	59% 4 6% 19% 9% 2	5359
April	1st to 10th	Night	60% 3 8% 15% 12% 2	2100
	11th to 20th	Night	52% 5% 7% 21% 13% 2	2075
	21st to end	Night	55% 4 7% 18% 15% 2	1847
May	1st to 10th	Night	51% 6% 9% 21% 10% 3	4666
	11th to 20th	Night	50% 5% 11% 21% 11% 1	4640
	21st to end	Night	52% 5% 10% 19% 12% 1	5115
June	1st to 10th	Night	50% 7% 9% 21% 11% 1	1680
	11th to 20th	Night	48% 5% 11% 21% 13% 2	1547
	21st to end	Night	46% 6% 14% 22% 11% 1	1470
July	1st to 10th	Night	50% 6% 12% 20% 11% 1	4183
	11th to 20th	Night	43% 6% 18% 25% 8%	4632
	21st to end	Night	45% 5% 14% 26% 10%	4967
August	1st to 10th	Night	42% 7% 19% 24% 7%	2710
	11th to 20th	Night	47% 6% 15% 24% 8%	2938
	21st to end	Night	45% 7% 15% 24% 8% 2	3472
September	1st to 10th	Night	43% 5% 17% 25% 9% 1	2000
	11th to 20th	Night	44% 5% 16% 26% 9%	2000
	21st to end	Night	49% 5% 13% 25% 8%	2286
October	1st to 10th	Night	52% 4 11% 21% 12%	3920
	11th to 20th	Night	60% 4 11% 19% 5% 1	3899
	21st to end	Night	62% 3 16% 11% 7% 1	4503
November	1st to 10th	Night	65% 4 11% 16% 4	2782
	11th to 20th	Night	71% 5% 9% 10% 5%	2940
	21st to end	Night	80% 4 8% 7% 2	2940
December	1st to 10th	Night	83% 4 6% 5% 2	4720
	11th to 20th	Night	74% 3 5% 12% 5%	5348
	21st to end	Night	78% 3 3 11% 6%	7150

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	22% 20% 42% 13% 2 1	220
	11th to 20th	Day	23% 19% 34% 18% 5% 1	220
	21st to end	Day	17% 24% 31% 23% 6%	275
February	1st to 10th	Day	25% 25% 36% 8% 5% 1	330
	11th to 20th	Day	24% 28% 34% 12% 1	330
	21st to end	Day	29% 21% 38% 11% 2	369
March	1st to 10th	Day	25% 21% 34% 16% 4	540
	11th to 20th	Day	28% 22% 33% 13% 3 1	540
	21st to end	Day	29% 18% 35% 13% 4 1	594
April	1st to 10th	Day	35% 19% 25% 14% 6%	540
	11th to 20th	Day	33% 19% 25% 14% 6% 3	532
	21st to end	Day	29% 19% 31% 15% 4 1	540
May	1st to 10th	Day	24% 18% 33% 17% 6% 2	543
	11th to 20th	Day	26% 16% 31% 18% 8% 2	567
	21st to end	Day	27% 18% 30% 18% 6% 1	617
June	1st to 10th	Day	27% 13% 31% 22% 5% 1	570
	11th to 20th	Day	21% 16% 34% 19% 9% 1	696
	21st to end	Day	21% 15% 29% 23% 9% 2	780
July	1st to 10th	Day	15% 10% 39% 27% 8% 1	731
	11th to 20th	Day	19% 12% 35% 21% 12% 2	564
	21st to end	Day	18% 11% 33% 25% 10% 2	620
August	1st to 10th	Day	18% 10% 31% 27% 10% 3	566
	11th to 20th	Day	18% 9% 28% 25% 15% 5%	535
	21st to end	Day	20% 13% 32% 20% 11% 4	583
September	1st to 10th	Day	23% 11% 31% 20% 11% 3	530
	11th to 20th	Day	20% 9% 28% 23% 15% 6%	530
	21st to end	Day	25% 14% 26% 20% 11% 4	530
October	1st to 10th	Day	27% 14% 26% 23% 8% 2	530
	11th to 20th	Day	33% 22% 27% 14% 3 1	530
	21st to end	Day	37% 14% 28% 18% 3	498
November	1st to 10th	Day	34% 19% 31% 11% 3 1	305
	11th to 20th	Day	26% 22% 37% 10% 4 1	220
	21st to end	Day	37% 24% 26% 10% 2	220
December	1st to 10th	Day	30% 18% 32% 15% 4 1	220
	11th to 20th	Day	30% 17% 38% 11% 2 1	220
	21st to end	Day	30% 20% 33% 11% 5% 2	242
January	1st to 10th	Night	28% 16% 34% 19% 3	840
	11th to 20th	Night	28% 16% 28% 22% 5%	840
	21st to end	Night	18% 13% 36% 24% 9%	924
February	1st to 10th	Night	17% 18% 38% 22% 5% 1	840
	11th to 20th	Night	22% 16% 37% 20% 4	823
	21st to end	Night	21% 19% 34% 21% 4 1	692
March	1st to 10th	Night	26% 19% 30% 20% 4 1	840
	11th to 20th	Night	27% 21% 32% 16% 5% 1	840
	21st to end	Night	23% 15% 34% 21% 6% 1	924
April	1st to 10th	Night	29% 15% 30% 22% 5%	840
	11th to 20th	Night	24% 17% 28% 21% 8% 1	831
	21st to end	Night	28% 13% 30% 22% 7% 1	587
May	1st to 10th	Night	23% 8% 33% 25% 10%	420
	11th to 20th	Night	23% 9% 28% 30% 9%	414
	21st to end	Night	20% 11% 36% 26% 7%	455
June	1st to 10th	Night	22% 8% 37% 25% 7%	420
	11th to 20th	Night	21% 11% 27% 28% 12%	420
	21st to end	Night	19% 7% 28% 33% 12%	420
July	1st to 10th	Night	17% 7% 32% 34% 9%	410
	11th to 20th	Night	16% 8% 28% 36% 12% 1	408
	21st to end	Night	15% 7% 27% 37% 13%	460
August	1st to 10th	Night	17% 7% 26% 33% 17%	446
	11th to 20th	Night	17% 6% 24% 30% 21% 3	606
	21st to end	Night	20% 7% 29% 26% 16% 2	805
September	1st to 10th	Night	20% 8% 31% 27% 13% 1	800
	11th to 20th	Night	23% 7% 27% 24% 16% 3	800
	21st to end	Night	25% 8% 27% 26% 13% 1	800
October	1st to 10th	Night	26% 11% 31% 20% 11% 1	800
	11th to 20th	Night	35% 14% 27% 17% 6% 1	800
	21st to end	Night	36% 13% 26% 21% 3	880
November	1st to 10th	Night	31% 15% 32% 17% 4 1	820
	11th to 20th	Night	30% 18% 31% 15% 6%	840
	21st to end	Night	35% 18% 27% 17% 4 1	840
December	1st to 10th	Night	30% 19% 30% 15% 5% 1	840
	11th to 20th	Night	29% 18% 31% 16% 5% 1	840
	21st to end	Night	33% 18% 26% 18% 5%	924

Page generated at 2026-08-12 03:37:20. Version ac07

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