Camden Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camden Lake clear sky chart from 2005-11-06 to 2024-01-31.

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% 9% 3 7% 6% 3 5% 5% 5% 7% 34%	74866
	Night	18% 9% 4 7% 5% 3 4 5% 5% 6% 34%	75259
Transparency	Day	50% 7% 12% 20% 11% 1	74571
	Night	50% 6% 12% 20% 11% 1	75088
Seeing	Day	22% 17% 31% 19% 9% 3	13419
	Night	22% 13% 31% 23% 9% 1	22769

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	17% 16% 4 8% 7% 3 5% 4 5% 6% 25%	1517
	11th to 20th	Day	18% 17% 6% 8% 7% 3 5% 4 4 5% 24%	1520
	21st to end	Day	14% 14% 7% 11% 8% 4 5% 4 4 5% 24%	1829
February	1st to 10th	Day	16% 16% 4 10% 8% 4 5% 4 5% 6% 21%	1620
	11th to 20th	Day	13% 16% 5% 10% 7% 3 6% 4 3 4 28%	1573
	21st to end	Day	21% 14% 5% 7% 7% 5% 5% 4 4 4 25%	1453
March	1st to 10th	Day	15% 12% 5% 10% 7% 4 5% 3 4 5% 29%	1859
	11th to 20th	Day	16% 13% 5% 8% 6% 4 4 4 3 5% 31%	1980
	21st to end	Day	21% 10% 3 6% 5% 2 3 4 4 4 38%	2250
April	1st to 10th	Day	20% 13% 4 6% 5% 3 4 4 3 5% 34%	2160
	11th to 20th	Day	21% 9% 2 4 4 2 4 4 4 6% 40%	2134
	21st to end	Day	22% 9% 4 7% 6% 3 4 4 4 5% 32%	2270
May	1st to 10th	Day	19% 8% 3 6% 5% 3 5% 5% 5% 7% 34%	2492
	11th to 20th	Day	16% 7% 3 6% 6% 3 4 5% 5% 7% 40%	2478
	21st to end	Day	14% 5% 3 5% 6% 3 5% 5% 6% 8% 40%	2725
June	1st to 10th	Day	20% 7% 3 6% 5% 4 5% 5% 5% 6% 34%	2520
	11th to 20th	Day	16% 5% 3 6% 4 3 5% 5% 6% 9% 40%	2520
	21st to end	Day	17% 8% 3 5% 5% 3 5% 5% 6% 8% 36%	2520
July	1st to 10th	Day	12% 5% 2 5% 5% 3 5% 6% 5% 9% 43%	2520
	11th to 20th	Day	13% 6% 2 4 5% 4 5% 6% 6% 10% 39%	2520
	21st to end	Day	12% 5% 3 5% 6% 4 6% 7% 7% 9% 37%	2744
August	1st to 10th	Day	12% 6% 3 6% 5% 3 5% 5% 7% 9% 40%	2368
	11th to 20th	Day	12% 5% 2 6% 5% 4 5% 6% 7% 7% 41%	2303
	21st to end	Day	14% 5% 2 5% 5% 3 4 5% 7% 8% 41%	2376
September	1st to 10th	Day	14% 5% 3 4 5% 3 5% 5% 5% 8% 43%	2160
	11th to 20th	Day	12% 5% 3 5% 4 3 3 4 4 8% 49%	2160
	21st to end	Day	18% 6% 3 5% 4 3 4 5% 5% 8% 39%	1901
October	1st to 10th	Day	21% 7% 3 6% 5% 4 4 4 4 7% 36%	1800
	11th to 20th	Day	23% 7% 2 7% 5% 4 5% 4 5% 8% 30%	1800
	21st to end	Day	28% 10% 4 6% 5% 3 4 5% 4 6% 26%	1903
November	1st to 10th	Day	17% 8% 3 6% 5% 3 6% 5% 5% 8% 34%	1653
	11th to 20th	Day	18% 11% 4 7% 6% 3 4 5% 5% 5% 31%	1520
	21st to end	Day	21% 13% 4 7% 6% 3 4 5% 4 6% 25%	1520
December	1st to 10th	Day	22% 15% 5% 8% 6% 3 6% 5% 5% 6% 21%	1520
	11th to 20th	Day	20% 15% 4 8% 5% 3 4 4 5% 5% 26%	1906
	21st to end	Day	29% 14% 5% 10% 6% 3 3 3 2 4 21%	2772
January	1st to 10th	Night	20% 14% 6% 10% 7% 3 4 5% 4 5% 22%	2649
	11th to 20th	Night	18% 15% 5% 10% 7% 4 5% 5% 4 5% 23%	2660
	21st to end	Night	14% 14% 6% 10% 7% 4 5% 5% 5% 5% 27%	2753
February	1st to 10th	Night	17% 12% 5% 9% 8% 4 6% 5% 5% 6% 24%	2340
	11th to 20th	Night	15% 12% 6% 8% 6% 4 4 4 5% 5% 30%	2273
	21st to end	Night	18% 12% 4 6% 7% 4 5% 4 5% 6% 30%	1801
March	1st to 10th	Night	14% 11% 5% 7% 6% 3 5% 5% 5% 6% 32%	2086
	11th to 20th	Night	18% 12% 5% 6% 5% 2 4 4 4 5% 34%	1979
	21st to end	Night	19% 8% 4 6% 5% 2 4 3 5% 5% 40%	2105
April	1st to 10th	Night	21% 9% 4 6% 5% 2 4 4 5% 6% 35%	1800
	11th to 20th	Night	19% 7% 4 5% 5% 3 4 4 5% 5% 38%	1775
	21st to end	Night	20% 8% 2 7% 5% 3 5% 4 7% 6% 33%	1706
May	1st to 10th	Night	22% 7% 3 4 5% 2 5% 4 4 7% 37%	1468
	11th to 20th	Night	13% 6% 3 5% 5% 3 4 5% 6% 7% 44%	1415
	21st to end	Night	11% 5% 2 5% 5% 3 5% 4 6% 9% 46%	1550
June	1st to 10th	Night	17% 5% 2 6% 5% 4 6% 5% 7% 8% 35%	1440
	11th to 20th	Night	13% 6% 2 5% 5% 2 5% 4 6% 8% 44%	1440
	21st to end	Night	15% 5% 2 5% 6% 3 5% 6% 7% 7% 39%	1440
July	1st to 10th	Night	10% 4 2 5% 5% 3 4 5% 5% 8% 48%	1440
	11th to 20th	Night	11% 5% 2 5% 4 3 4 6% 6% 10% 43%	1440
	21st to end	Night	11% 5% 2 4 4 3 5% 4 7% 9% 48%	1574
August	1st to 10th	Night	10% 5% 2 5% 5% 3 4 4 6% 9% 47%	1566
	11th to 20th	Night	10% 5% 3 5% 5% 3 4 5% 7% 8% 46%	1598
	21st to end	Night	10% 5% 3 4 5% 3 4 5% 7% 8% 46%	1961
September	1st to 10th	Night	13% 5% 3 5% 5% 3 3 4 5% 9% 47%	1800
	11th to 20th	Night	14% 4 1 4 4 2 4 4 5% 6% 52%	1800
	21st to end	Night	17% 5% 3 5% 4 4 4 4 5% 6% 43%	2055
October	1st to 10th	Night	17% 7% 3 6% 6% 3 5% 5% 5% 5% 38%	2160
	11th to 20th	Night	22% 7% 3 7% 6% 3 5% 5% 5% 6% 31%	2160
	21st to end	Night	23% 10% 4 7% 5% 3 4 5% 5% 6% 29%	2452
November	1st to 10th	Night	19% 9% 3 5% 4 2 4 4 4 6% 38%	2421
	11th to 20th	Night	20% 9% 3 6% 5% 3 5% 5% 5% 7% 33%	2660
	21st to end	Night	22% 10% 3 7% 5% 4 5% 5% 4 6% 28%	2660
December	1st to 10th	Night	21% 15% 5% 8% 6% 3 4 5% 5% 5% 22%	2660
	11th to 20th	Night	21% 16% 4 7% 5% 3 4 3 4 4 28%	3288
	21st to end	Night	30% 15% 4 8% 5% 3 4 4 4 5% 17%	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	60% 7% 11% 16% 5% 1	1518
	11th to 20th	Day	64% 5% 10% 11% 10% 1	1520
	21st to end	Day	63% 5% 10% 12% 8% 2	1829
February	1st to 10th	Day	63% 6% 10% 15% 5% 1	1620
	11th to 20th	Day	61% 5% 9% 15% 9% 1	1582
	21st to end	Day	63% 4 10% 12% 10% 1	1453
March	1st to 10th	Day	59% 3 12% 15% 9% 2	1862
	11th to 20th	Day	57% 5% 10% 15% 11% 2	1980
	21st to end	Day	51% 4 7% 19% 14% 5%	2250
April	1st to 10th	Day	55% 4 7% 19% 13% 3	2160
	11th to 20th	Day	47% 4 8% 23% 16% 2	2134
	21st to end	Day	54% 4 9% 16% 13% 4	2270
May	1st to 10th	Day	49% 6% 9% 17% 14% 3	2492
	11th to 20th	Day	44% 7% 10% 22% 15% 3	2482
	21st to end	Day	41% 8% 15% 20% 12% 3	2725
June	1st to 10th	Day	49% 8% 11% 18% 13% 1	2520
	11th to 20th	Day	41% 7% 12% 25% 14% 2	2520
	21st to end	Day	44% 8% 14% 20% 12% 1	2520
July	1st to 10th	Day	36% 8% 13% 26% 16% 1	2450
	11th to 20th	Day	38% 8% 17% 28% 9%	2445
	21st to end	Day	40% 9% 17% 23% 10%	2591
August	1st to 10th	Day	38% 9% 16% 25% 11% 1	2354
	11th to 20th	Day	39% 9% 16% 25% 10% 1	2303
	21st to end	Day	39% 8% 13% 27% 12% 1	2376
September	1st to 10th	Day	38% 8% 15% 26% 12% 1	2160
	11th to 20th	Day	34% 6% 13% 30% 16% 1	2160
	21st to end	Day	43% 7% 12% 28% 9%	1901
October	1st to 10th	Day	48% 6% 12% 22% 12% 1	1800
	11th to 20th	Day	52% 7% 15% 19% 6% 1	1800
	21st to end	Day	60% 6% 10% 17% 8%	1903
November	1st to 10th	Day	47% 7% 15% 22% 9% 1	1653
	11th to 20th	Day	54% 6% 11% 18% 10% 1	1520
	21st to end	Day	59% 8% 12% 12% 8%	1520
December	1st to 10th	Day	63% 7% 12% 13% 5% 1	1520
	11th to 20th	Day	61% 6% 14% 13% 5%	1906
	21st to end	Day	69% 5% 7% 15% 5%	2772
January	1st to 10th	Night	63% 6% 10% 14% 6%	2649
	11th to 20th	Night	64% 6% 10% 12% 7% 1	2660
	21st to end	Night	59% 6% 10% 16% 9% 1	2753
February	1st to 10th	Night	61% 6% 11% 16% 5% 1	2340
	11th to 20th	Night	57% 4 9% 20% 9% 1	2275
	21st to end	Night	55% 6% 11% 17% 10% 1	1801
March	1st to 10th	Night	52% 5% 11% 20% 11% 1	2096
	11th to 20th	Night	52% 5% 10% 20% 12% 1	1980
	21st to end	Night	48% 4 8% 20% 17% 3	2105
April	1st to 10th	Night	50% 4 7% 22% 14% 2	1800
	11th to 20th	Night	47% 5% 9% 19% 17% 2	1775
	21st to end	Night	50% 6% 9% 16% 16% 3	1706
May	1st to 10th	Night	48% 4 9% 18% 17% 4	1468
	11th to 20th	Night	38% 7% 11% 27% 15% 3	1416
	21st to end	Night	35% 7% 16% 20% 19% 3	1551
June	1st to 10th	Night	45% 7% 13% 22% 12% 1	1440
	11th to 20th	Night	38% 7% 13% 20% 20% 2	1440
	21st to end	Night	41% 7% 16% 23% 12% 1	1440
July	1st to 10th	Night	31% 9% 12% 23% 22% 2	1400
	11th to 20th	Night	34% 8% 13% 31% 14%	1392
	21st to end	Night	32% 7% 15% 31% 13% 1	1486
August	1st to 10th	Night	33% 9% 17% 29% 12% 1	1556
	11th to 20th	Night	34% 8% 16% 28% 13% 1	1598
	21st to end	Night	34% 8% 14% 30% 14%	1961
September	1st to 10th	Night	36% 7% 15% 28% 13% 1	1800
	11th to 20th	Night	32% 6% 14% 33% 14% 1	1800
	21st to end	Night	40% 6% 11% 30% 11% 1	2055
October	1st to 10th	Night	47% 7% 11% 20% 14% 1	2160
	11th to 20th	Night	52% 6% 13% 20% 8% 1	2160
	21st to end	Night	55% 7% 13% 14% 10%	2452
November	1st to 10th	Night	46% 6% 14% 22% 11% 1	2421
	11th to 20th	Night	50% 6% 12% 19% 11% 2	2660
	21st to end	Night	56% 7% 13% 17% 6%	2660
December	1st to 10th	Night	62% 6% 12% 15% 4	2660
	11th to 20th	Night	60% 5% 11% 16% 7% 1	3288
	21st to end	Night	69% 6% 10% 12% 3	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	31% 19% 31% 15% 4	180
	11th to 20th	Day	29% 20% 34% 15% 2	180
	21st to end	Day	26% 21% 33% 17% 3	273
February	1st to 10th	Day	33% 31% 30% 6%	240
	11th to 20th	Day	26% 33% 34% 6%	240
	21st to end	Day	35% 23% 32% 8% 2	319
March	1st to 10th	Day	24% 22% 33% 16% 5%	420
	11th to 20th	Day	29% 22% 30% 15% 5%	420
	21st to end	Day	34% 18% 27% 13% 6% 1	462
April	1st to 10th	Day	29% 22% 31% 13% 5%	420
	11th to 20th	Day	30% 23% 21% 14% 9% 3	412
	21st to end	Day	27% 21% 32% 12% 5% 2	420
May	1st to 10th	Day	24% 18% 28% 19% 8% 2	423
	11th to 20th	Day	21% 14% 38% 17% 8% 2	447
	21st to end	Day	16% 15% 34% 21% 11% 3	485
June	1st to 10th	Day	21% 14% 35% 21% 8% 2	450
	11th to 20th	Day	16% 15% 33% 23% 11% 2	450
	21st to end	Day	20% 13% 32% 21% 11% 2	450
July	1st to 10th	Day	12% 9% 30% 31% 15% 4	445
	11th to 20th	Day	15% 10% 30% 27% 14% 4	444
	21st to end	Day	14% 7% 38% 27% 10% 4	488
August	1st to 10th	Day	14% 8% 30% 28% 15% 5%	446
	11th to 20th	Day	11% 7% 29% 31% 16% 6%	439
	21st to end	Day	13% 12% 32% 25% 11% 8%	495
September	1st to 10th	Day	14% 11% 33% 24% 12% 7%	450
	11th to 20th	Day	12% 10% 28% 24% 18% 9%	450
	21st to end	Day	17% 12% 30% 23% 13% 4	450
October	1st to 10th	Day	25% 16% 27% 15% 13% 4	450
	11th to 20th	Day	25% 23% 29% 18% 4 2	450
	21st to end	Day	33% 18% 27% 18% 4	456
November	1st to 10th	Day	26% 18% 26% 20% 9% 1	347
	11th to 20th	Day	32% 19% 31% 13% 4 1	180
	21st to end	Day	24% 23% 37% 11% 4 1	180
December	1st to 10th	Day	28% 25% 33% 10% 3 1	180
	11th to 20th	Day	33% 26% 27% 11% 3	180
	21st to end	Day	34% 22% 31% 11% 2	198
January	1st to 10th	Night	28% 18% 32% 19% 3	760
	11th to 20th	Night	29% 17% 30% 19% 4	760
	21st to end	Night	21% 16% 36% 23% 4	835
February	1st to 10th	Night	26% 20% 34% 18% 2	720
	11th to 20th	Night	24% 16% 39% 17% 4	703
	21st to end	Night	25% 20% 34% 17% 3	592
March	1st to 10th	Night	23% 17% 37% 20% 4	720
	11th to 20th	Night	25% 19% 31% 20% 4 1	720
	21st to end	Night	23% 15% 33% 20% 7% 1	792
April	1st to 10th	Night	26% 16% 34% 21% 3	720
	11th to 20th	Night	22% 19% 32% 19% 8% 1	711
	21st to end	Night	24% 12% 31% 23% 10%	626
May	1st to 10th	Night	26% 7% 28% 27% 11% 1	388
	11th to 20th	Night	15% 9% 35% 32% 8%	354
	21st to end	Night	12% 9% 38% 29% 12% 1	389
June	1st to 10th	Night	16% 7% 36% 31% 10% 1	360
	11th to 20th	Night	14% 8% 35% 30% 13% 1	360
	21st to end	Night	16% 7% 26% 38% 13%	360
July	1st to 10th	Night	8% 7% 29% 37% 19%	350
	11th to 20th	Night	13% 4 28% 34% 20% 1	348
	21st to end	Night	12% 3 31% 39% 14% 1	394
August	1st to 10th	Night	11% 4 26% 34% 23% 1	492
	11th to 20th	Night	12% 5% 23% 35% 23% 3	534
	21st to end	Night	12% 6% 31% 31% 17% 2	773
September	1st to 10th	Night	14% 7% 30% 30% 16% 3	720
	11th to 20th	Night	14% 7% 24% 27% 24% 4	720
	21st to end	Night	20% 10% 21% 28% 18% 2	720
October	1st to 10th	Night	22% 13% 28% 21% 16% 2	720
	11th to 20th	Night	26% 15% 30% 21% 8% 1	720
	21st to end	Night	27% 15% 29% 22% 5%	792
November	1st to 10th	Night	26% 12% 30% 23% 8% 1	740
	11th to 20th	Night	26% 16% 33% 17% 7% 1	760
	21st to end	Night	30% 17% 28% 18% 7%	760
December	1st to 10th	Night	31% 20% 29% 18% 3	760
	11th to 20th	Night	27% 20% 34% 16% 3 1	760
	21st to end	Night	34% 16% 32% 16% 2	836

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