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 2024-10-24.

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	18% 13% 4 10% 6% 5% 5% 4 5% 6% 27%	102072
	Night	17% 14% 5% 10% 6% 5% 4 3 4 5% 25%	96686
Transparency	Day	58% 5% 10% 18% 8% 1	101828
	Night	61% 5% 10% 16% 7% 1	96552
Seeing	Day	25% 16% 32% 19% 7% 2	14705
	Night	25% 13% 30% 22% 8% 1	23298

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	15% 21% 8% 15% 8% 5% 6% 3 4 4 11%	2517
	11th to 20th	Day	12% 14% 8% 20% 8% 6% 5% 3 5% 4 15%	2520
	21st to end	Day	12% 20% 9% 16% 6% 6% 5% 3 4 5% 14%	2868
February	1st to 10th	Day	7% 20% 7% 14% 11% 8% 5% 4 4 5% 15%	1710
	11th to 20th	Day	11% 19% 8% 15% 8% 5% 5% 4 4 4 19%	1663
	21st to end	Day	15% 19% 6% 10% 7% 5% 4 5% 4 5% 19%	1499
March	1st to 10th	Day	20% 19% 4 9% 4 4 4 3 3 4 25%	3180
	11th to 20th	Day	11% 18% 7% 16% 6% 4 3 2 3 4 25%	3480
	21st to end	Day	12% 10% 5% 11% 6% 7% 5% 3 4 5% 31%	3969
April	1st to 10th	Day	22% 17% 4 8% 4 3 3 3 4 5% 28%	2280
	11th to 20th	Day	23% 12% 4 8% 4 4 3 2 4 5% 31%	2258
	21st to end	Day	20% 13% 4 7% 6% 4 3 3 4 5% 32%	2522
May	1st to 10th	Day	21% 12% 3 8% 4 4 4 3 5% 6% 29%	4426
	11th to 20th	Day	19% 10% 3 8% 5% 5% 4 4 6% 6% 30%	4398
	21st to end	Day	19% 8% 3 6% 4 5% 5% 4 5% 7% 33%	4837
June	1st to 10th	Day	22% 10% 3 7% 5% 5% 5% 4 5% 6% 26%	2660
	11th to 20th	Day	16% 7% 2 7% 5% 4 5% 5% 6% 9% 33%	2774
	21st to end	Day	20% 9% 3 8% 6% 5% 5% 4 7% 8% 26%	2850
July	1st to 10th	Day	17% 8% 3 8% 5% 5% 5% 4 7% 8% 29%	4696
	11th to 20th	Day	17% 8% 3 7% 5% 5% 5% 5% 7% 8% 32%	4440
	21st to end	Day	15% 6% 3 6% 5% 5% 5% 4 6% 7% 38%	4814
August	1st to 10th	Day	16% 7% 3 9% 7% 5% 6% 5% 6% 7% 29%	4370
	11th to 20th	Day	17% 8% 3 7% 4 5% 5% 4 6% 7% 33%	4044
	21st to end	Day	15% 7% 3 7% 4 5% 5% 4 6% 8% 36%	4258
September	1st to 10th	Day	19% 8% 3 7% 5% 4 4 3 5% 6% 36%	2280
	11th to 20th	Day	19% 8% 3 6% 3 5% 5% 3 4 6% 38%	2280
	21st to end	Day	22% 11% 3 6% 4 4 3 3 5% 7% 32%	2004
October	1st to 10th	Day	22% 14% 4 8% 4 4 3 3 4 6% 29%	1900
	11th to 20th	Day	29% 18% 5% 9% 4 3 3 2 4 5% 19%	1900
	21st to end	Day	28% 18% 4 8% 4 4 4 2 4 5% 18%	1874
November	1st to 10th	Day	17% 22% 7% 9% 3 4 3 2 4 5% 24%	1563
	11th to 20th	Day	18% 18% 8% 15% 7% 4 4 2 3 4 16%	1520
	21st to end	Day	23% 22% 8% 14% 8% 5% 3 2 3 3 9%	1520
December	1st to 10th	Day	19% 23% 8% 13% 8% 6% 3 3 3 3 10%	1520
	11th to 20th	Day	18% 18% 6% 16% 9% 6% 6% 4 3 3 12%	1906
	21st to end	Day	19% 21% 9% 14% 7% 3 3 2 3 4 13%	2772
January	1st to 10th	Night	14% 20% 8% 16% 9% 6% 4 3 3 4 13%	4429
	11th to 20th	Night	12% 16% 6% 16% 10% 6% 6% 4 5% 5% 13%	4440
	21st to end	Night	9% 20% 11% 15% 7% 8% 6% 4 5% 4 12%	4787
February	1st to 10th	Night	11% 15% 6% 11% 11% 8% 6% 4 5% 5% 18%	2470
	11th to 20th	Night	12% 18% 6% 13% 9% 6% 5% 3 4 5% 18%	2403
	21st to end	Night	12% 18% 6% 12% 8% 5% 6% 3 5% 5% 20%	1954
March	1st to 10th	Night	16% 20% 5% 7% 5% 4 4 3 4 5% 27%	3642
	11th to 20th	Night	16% 19% 5% 13% 6% 4 4 3 4 5% 21%	3479
	21st to end	Night	12% 10% 5% 13% 6% 5% 5% 4 5% 5% 31%	3663
April	1st to 10th	Night	19% 15% 6% 10% 5% 3 3 3 4 5% 29%	1900
	11th to 20th	Night	17% 11% 4 9% 5% 3 5% 3 5% 5% 34%	1875
	21st to end	Night	22% 12% 3 7% 4 4 4 4 4 5% 31%	1672
May	1st to 10th	Night	20% 10% 3 8% 5% 5% 5% 4 4 6% 30%	2514
	11th to 20th	Night	19% 9% 3 9% 5% 5% 4 3 4 6% 33%	2495
	21st to end	Night	17% 9% 3 7% 4 5% 5% 4 5% 8% 33%	2738
June	1st to 10th	Night	18% 10% 3 8% 5% 5% 5% 4 6% 7% 30%	1520
	11th to 20th	Night	17% 9% 3 7% 4 4 5% 4 4 7% 37%	1400
	21st to end	Night	18% 7% 3 6% 4 4 5% 4 6% 8% 35%	1330
July	1st to 10th	Night	18% 9% 3 9% 6% 6% 5% 4 5% 6% 29%	2267
	11th to 20th	Night	17% 8% 3 6% 5% 4 4 4 6% 7% 34%	2520
	21st to end	Night	12% 8% 2 7% 4 4 4 4 5% 7% 43%	2739
August	1st to 10th	Night	14% 8% 2 6% 5% 4 5% 4 6% 8% 39%	2557
	11th to 20th	Night	19% 9% 3 7% 4 4 4 4 5% 5% 36%	2785
	21st to end	Night	18% 7% 2 6% 4 4 5% 4 6% 8% 37%	3366
September	1st to 10th	Night	17% 9% 2 6% 4 3 4 3 5% 7% 40%	1900
	11th to 20th	Night	20% 7% 2 7% 3 3 4 3 4 6% 40%	1900
	21st to end	Night	22% 10% 3 5% 4 3 3 3 4 7% 36%	2171
October	1st to 10th	Night	22% 11% 4 6% 3 4 4 4 5% 5% 31%	2280
	11th to 20th	Night	25% 17% 3 9% 4 4 3 3 3 5% 24%	2280
	21st to end	Night	27% 19% 5% 8% 5% 3 3 2 4 5% 19%	2548
November	1st to 10th	Night	18% 18% 5% 10% 5% 4 3 3 4 4 25%	2510
	11th to 20th	Night	20% 18% 6% 14% 6% 4 4 3 4 5% 17%	2660
	21st to end	Night	23% 21% 6% 14% 7% 4 3 2 3 3 12%	2660
December	1st to 10th	Night	19% 21% 6% 15% 9% 4 4 3 3 4 11%	2660
	11th to 20th	Night	20% 19% 6% 13% 6% 5% 6% 3 4 3 15%	3288
	21st to end	Night	20% 21% 6% 16% 8% 4 4 2 3 3 13%	4884

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% 3 9% 7% 2	2518
	11th to 20th	Day	73% 3 6% 13% 5%	2520
	21st to end	Day	73% 4 6% 11% 6% 1	2868
February	1st to 10th	Day	71% 4 5% 12% 7% 1	1710
	11th to 20th	Day	70% 3 7% 11% 9% 1	1672
	21st to end	Day	66% 3 7% 15% 8%	1499
March	1st to 10th	Day	64% 3 6% 15% 11% 1	3183
	11th to 20th	Day	64% 3 8% 14% 9% 1	3480
	21st to end	Day	54% 5% 6% 19% 14% 2	3969
April	1st to 10th	Day	60% 3 9% 15% 11% 2	2280
	11th to 20th	Day	56% 3 8% 21% 10% 2	2258
	21st to end	Day	56% 4 8% 15% 15% 2	2522
May	1st to 10th	Day	55% 6% 7% 21% 9% 2	4440
	11th to 20th	Day	51% 7% 10% 22% 9% 1	4402
	21st to end	Day	49% 5% 11% 18% 16% 1	4837
June	1st to 10th	Day	57% 6% 9% 19% 9% 1	2660
	11th to 20th	Day	45% 7% 12% 23% 11% 1	2774
	21st to end	Day	54% 8% 12% 18% 9%	2850
July	1st to 10th	Day	49% 7% 15% 24% 5%	4624
	11th to 20th	Day	47% 7% 15% 24% 7%	4365
	21st to end	Day	45% 7% 14% 25% 9%	4661
August	1st to 10th	Day	52% 6% 13% 24% 5%	4356
	11th to 20th	Day	49% 6% 16% 23% 7%	4083
	21st to end	Day	44% 6% 10% 28% 10% 1	4258
September	1st to 10th	Day	48% 5% 12% 22% 12% 1	2280
	11th to 20th	Day	46% 5% 17% 22% 9% 1	2280
	21st to end	Day	52% 5% 14% 20% 8%	2004
October	1st to 10th	Day	57% 4 11% 19% 8% 1	1900
	11th to 20th	Day	69% 4 10% 12% 3 1	1900
	21st to end	Day	70% 5% 9% 11% 5% 1	1874
November	1st to 10th	Day	63% 3 13% 15% 6%	1563
	11th to 20th	Day	74% 3 8% 10% 5%	1520
	21st to end	Day	81% 4 7% 4 3	1520
December	1st to 10th	Day	80% 3 7% 8% 2	1520
	11th to 20th	Day	77% 4 4 9% 5% 1	1906
	21st to end	Day	77% 2 6% 12% 2	2772
January	1st to 10th	Night	77% 3 12% 7% 2	4429
	11th to 20th	Night	72% 4 9% 11% 3 1	4440
	21st to end	Night	75% 5% 6% 9% 6%	4787
February	1st to 10th	Night	66% 5% 7% 14% 7% 1	2470
	11th to 20th	Night	68% 4 7% 12% 7% 1	2405
	21st to end	Night	64% 5% 9% 14% 9% 1	1954
March	1st to 10th	Night	61% 3 9% 13% 12% 2	3652
	11th to 20th	Night	66% 4 9% 14% 6% 1	3480
	21st to end	Night	53% 5% 8% 21% 10% 3	3663
April	1st to 10th	Night	59% 3 8% 15% 12% 2	1900
	11th to 20th	Night	52% 5% 7% 22% 12% 2	1875
	21st to end	Night	56% 4 7% 17% 15% 2	1672
May	1st to 10th	Night	53% 6% 12% 17% 10% 2	2520
	11th to 20th	Night	53% 5% 11% 19% 11% 1	2496
	21st to end	Night	49% 5% 11% 20% 12% 2	2739
June	1st to 10th	Night	52% 7% 10% 21% 9% 1	1520
	11th to 20th	Night	47% 5% 11% 21% 14% 2	1400
	21st to end	Night	46% 7% 14% 21% 11% 1	1330
July	1st to 10th	Night	55% 5% 12% 19% 8% 1	2231
	11th to 20th	Night	47% 7% 19% 21% 5%	2472
	21st to end	Night	41% 5% 14% 27% 12%	2651
August	1st to 10th	Night	42% 7% 20% 25% 6%	2547
	11th to 20th	Night	48% 6% 14% 23% 8%	2812
	21st to end	Night	45% 7% 15% 24% 8% 2	3366
September	1st to 10th	Night	43% 5% 17% 25% 10% 1	1900
	11th to 20th	Night	45% 5% 16% 25% 8%	1900
	21st to end	Night	49% 5% 13% 25% 8%	2171
October	1st to 10th	Night	55% 5% 11% 17% 11% 1	2280
	11th to 20th	Night	65% 5% 10% 16% 4 1	2280
	21st to end	Night	68% 4 10% 13% 4 1	2548
November	1st to 10th	Night	63% 4 12% 16% 5%	2510
	11th to 20th	Night	70% 5% 9% 10% 5%	2660
	21st to end	Night	78% 4 8% 7% 2	2660
December	1st to 10th	Night	78% 5% 7% 7% 3	2660
	11th to 20th	Night	73% 4 7% 10% 5%	3288
	21st to end	Night	78% 3 4 11% 4	4884

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% 23% 40% 12% 2 1	180
	11th to 20th	Day	24% 18% 34% 18% 5% 1	180
	21st to end	Day	19% 21% 29% 23% 7%	225
February	1st to 10th	Day	26% 25% 38% 7% 4	270
	11th to 20th	Day	26% 26% 35% 12% 1	270
	21st to end	Day	31% 21% 38% 8% 2	311
March	1st to 10th	Day	23% 20% 34% 18% 4	460
	11th to 20th	Day	24% 22% 35% 15% 4 1	460
	21st to end	Day	28% 17% 36% 13% 4 1	506
April	1st to 10th	Day	33% 18% 27% 15% 7%	460
	11th to 20th	Day	31% 19% 26% 16% 6% 2	452
	21st to end	Day	27% 20% 31% 16% 5% 2	460
May	1st to 10th	Day	25% 17% 33% 16% 6% 2	463
	11th to 20th	Day	26% 15% 31% 19% 8% 2	487
	21st to end	Day	26% 16% 31% 19% 7% 1	529
June	1st to 10th	Day	27% 13% 31% 22% 6% 1	490
	11th to 20th	Day	20% 16% 34% 19% 10% 2	604
	21st to end	Day	22% 14% 29% 23% 10% 2	680
July	1st to 10th	Day	15% 9% 39% 28% 8%	635
	11th to 20th	Day	19% 10% 36% 22% 12% 2	484
	21st to end	Day	19% 10% 32% 27% 11% 2	532
August	1st to 10th	Day	19% 10% 31% 27% 9% 3	486
	11th to 20th	Day	19% 7% 28% 24% 15% 6%	479
	21st to end	Day	20% 14% 31% 20% 11% 4	539
September	1st to 10th	Day	23% 11% 32% 20% 11% 3	490
	11th to 20th	Day	21% 10% 29% 22% 13% 5%	490
	21st to end	Day	26% 13% 25% 20% 11% 4	490
October	1st to 10th	Day	29% 14% 25% 22% 8% 2	490
	11th to 20th	Day	34% 22% 26% 14% 3 1	490
	21st to end	Day	37% 15% 28% 17% 3	438
November	1st to 10th	Day	32% 19% 33% 12% 4 1	257
	11th to 20th	Day	27% 22% 36% 9% 4 1	180
	21st to end	Day	36% 23% 28% 11% 2 1	180
December	1st to 10th	Day	31% 16% 33% 15% 3 2	180
	11th to 20th	Day	30% 19% 36% 12% 1 2	180
	21st to end	Day	30% 18% 35% 12% 4 2	198
January	1st to 10th	Night	29% 16% 33% 19% 3	760
	11th to 20th	Night	28% 16% 29% 22% 5%	760
	21st to end	Night	19% 12% 36% 24% 9%	836
February	1st to 10th	Night	18% 17% 37% 22% 5% 1	760
	11th to 20th	Night	23% 16% 37% 19% 4	743
	21st to end	Night	22% 20% 33% 20% 4 1	628
March	1st to 10th	Night	24% 19% 30% 20% 5% 1	760
	11th to 20th	Night	26% 20% 31% 16% 6% 1	760
	21st to end	Night	22% 15% 34% 21% 7% 1	836
April	1st to 10th	Night	27% 15% 30% 22% 5%	760
	11th to 20th	Night	24% 17% 29% 21% 8%	751
	21st to end	Night	28% 13% 29% 23% 7% 1	532
May	1st to 10th	Night	24% 7% 33% 25% 10% 1	380
	11th to 20th	Night	23% 9% 29% 29% 9% 1	374
	21st to end	Night	20% 10% 38% 25% 8%	411
June	1st to 10th	Night	23% 8% 38% 25% 7%	380
	11th to 20th	Night	20% 11% 28% 28% 12% 1	380
	21st to end	Night	20% 7% 28% 33% 12% 1	380
July	1st to 10th	Night	17% 6% 32% 34% 9% 1	370
	11th to 20th	Night	16% 5% 27% 38% 13% 1	368
	21st to end	Night	13% 6% 27% 38% 14%	416
August	1st to 10th	Night	17% 7% 26% 32% 18%	403
	11th to 20th	Night	17% 6% 22% 30% 21% 3	564
	21st to end	Night	20% 7% 28% 26% 16% 2	765
September	1st to 10th	Night	21% 8% 30% 27% 13% 1	760
	11th to 20th	Night	24% 8% 27% 24% 16% 3	760
	21st to end	Night	26% 8% 27% 26% 12% 1	760
October	1st to 10th	Night	27% 11% 31% 19% 11% 1	760
	11th to 20th	Night	35% 14% 27% 17% 6% 1	760
	21st to end	Night	37% 14% 27% 19% 3	805
November	1st to 10th	Night	30% 15% 31% 18% 5% 1	740
	11th to 20th	Night	30% 19% 31% 15% 6% 1	760
	21st to end	Night	35% 17% 27% 16% 4 1	760
December	1st to 10th	Night	32% 18% 29% 14% 5% 1	760
	11th to 20th	Night	29% 18% 31% 16% 5% 1	760
	21st to end	Night	34% 18% 25% 18% 5%	836

Page generated at 2024-10-21 02:20:00. Version ac07

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