Camp No'Chimik
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp No'Chimik clear sky chart from 2005-11-06 to 2026-04-02.

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% 10% 3 8% 5% 5% 5% 4 5% 7% 32%	131595
	Night	17% 12% 4 9% 5% 5% 4 4 5% 6% 30%	130219
Transparency	Day	52% 4 12% 21% 10% 1	135060
	Night	54% 4 11% 20% 10% 1	134841
Seeing	Day	23% 14% 31% 20% 9% 3	16173
	Night	23% 12% 30% 25% 9% 1	25401

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	14% 18% 6% 14% 6% 5% 5% 3 5% 5% 20%	4661
	11th to 20th	Day	13% 17% 7% 14% 7% 5% 5% 4 4 5% 20%	4650
	21st to end	Day	10% 15% 6% 13% 8% 8% 7% 4 5% 5% 19%	5362
February	1st to 10th	Day	15% 15% 4 12% 7% 4 4 4 4 6% 24%	1890
	11th to 20th	Day	13% 15% 5% 10% 7% 5% 4 3 5% 6% 27%	1858
	21st to end	Day	19% 15% 4 10% 6% 4 4 4 5% 5% 24%	1730
March	1st to 10th	Day	18% 13% 4 11% 6% 5% 4 4 5% 6% 25%	4576
	11th to 20th	Day	11% 12% 5% 9% 6% 5% 6% 4 5% 7% 30%	5082
	21st to end	Day	18% 11% 3 8% 4 4 4 3 4 5% 37%	5908
April	1st to 10th	Day	22% 12% 3 7% 5% 3 4 3 4 6% 32%	2412
	11th to 20th	Day	21% 10% 3 7% 4 4 3 2 4 5% 36%	2374
	21st to end	Day	23% 10% 3 7% 5% 4 4 3 4 5% 32%	2528
May	1st to 10th	Day	24% 10% 3 8% 5% 4 5% 4 5% 7% 25%	6346
	11th to 20th	Day	18% 10% 4 8% 5% 5% 5% 4 5% 7% 30%	6318
	21st to end	Day	20% 9% 3 7% 5% 4 4 4 5% 7% 33%	6949
June	1st to 10th	Day	21% 9% 3 6% 5% 6% 4 4 6% 6% 30%	2800
	11th to 20th	Day	15% 6% 3 6% 4 5% 5% 5% 5% 8% 39%	2800
	21st to end	Day	18% 7% 3 7% 6% 4 5% 4 6% 6% 33%	2800
July	1st to 10th	Day	13% 6% 2 8% 5% 5% 5% 4 8% 8% 35%	6360
	11th to 20th	Day	11% 5% 2 6% 4 5% 5% 5% 6% 8% 43%	6360
	21st to end	Day	10% 6% 2 5% 4 4 5% 4 7% 10% 45%	6926
August	1st to 10th	Day	15% 7% 2 8% 4 5% 5% 4 5% 7% 37%	4484
	11th to 20th	Day	16% 7% 2 6% 4 4 5% 4 5% 8% 39%	4110
	21st to end	Day	15% 5% 2 6% 4 5% 5% 4 6% 9% 39%	4312
September	1st to 10th	Day	13% 6% 2 6% 4 4 4 4 6% 8% 43%	2400
	11th to 20th	Day	12% 5% 2 6% 4 4 4 3 5% 8% 48%	2396
	21st to end	Day	18% 6% 2 6% 4 4 4 4 5% 7% 39%	2140
October	1st to 10th	Day	19% 8% 2 6% 5% 4 5% 3 5% 6% 38%	2000
	11th to 20th	Day	20% 8% 4 9% 5% 4 5% 4 6% 7% 29%	2000
	21st to end	Day	25% 11% 3 7% 4 5% 4 3 4 5% 28%	2037
November	1st to 10th	Day	16% 10% 3 8% 5% 5% 5% 4 4 7% 32%	1851
	11th to 20th	Day	17% 14% 5% 8% 5% 4 5% 3 5% 6% 28%	1701
	21st to end	Day	22% 14% 4 8% 6% 5% 6% 4 5% 5% 21%	1680
December	1st to 10th	Day	21% 20% 5% 12% 5% 5% 5% 4 4 5% 15%	2680
	11th to 20th	Day	18% 15% 4 11% 6% 6% 4 4 4 4 24%	3066
	21st to end	Day	22% 16% 5% 11% 6% 5% 5% 3 3 4 21%	4048
January	1st to 10th	Night	14% 18% 7% 15% 6% 5% 4 3 4 4 20%	8234
	11th to 20th	Night	12% 17% 6% 15% 8% 6% 5% 3 5% 5% 18%	8235
	21st to end	Night	13% 15% 5% 12% 7% 6% 5% 4 5% 6% 23%	8817
February	1st to 10th	Night	13% 15% 5% 12% 7% 6% 4 4 5% 5% 23%	2730
	11th to 20th	Night	13% 14% 5% 12% 6% 5% 4 4 4 4 28%	2647
	21st to end	Night	15% 14% 5% 9% 7% 5% 4 3 5% 6% 28%	2076
March	1st to 10th	Night	22% 14% 4 9% 5% 4 4 2 4 4 29%	5484
	11th to 20th	Night	14% 12% 3 8% 5% 4 4 4 6% 7% 32%	5094
	21st to end	Night	19% 11% 3 7% 5% 4 3 3 5% 5% 34%	5265
April	1st to 10th	Night	20% 12% 3 7% 5% 5% 4 2 5% 6% 32%	2011
	11th to 20th	Night	20% 10% 3 8% 5% 4 3 3 4 5% 36%	1975
	21st to end	Night	22% 9% 3 7% 5% 3 4 3 4 7% 34%	1889
May	1st to 10th	Night	25% 8% 3 8% 5% 5% 6% 4 6% 6% 24%	3594
	11th to 20th	Night	16% 7% 3 7% 4 4 5% 4 5% 7% 37%	3575
	21st to end	Night	17% 10% 3 8% 4 4 5% 4 6% 7% 33%	3926
June	1st to 10th	Night	16% 8% 3 6% 6% 5% 5% 5% 6% 8% 33%	1600
	11th to 20th	Night	15% 6% 3 6% 4 4 4 4 6% 9% 41%	1600
	21st to end	Night	18% 8% 2 7% 5% 4 4 4 6% 7% 35%	1600
July	1st to 10th	Night	13% 6% 3 8% 6% 5% 5% 4 6% 9% 34%	3600
	11th to 20th	Night	12% 5% 2 6% 4 4 5% 4 5% 8% 44%	3600
	21st to end	Night	10% 5% 2 7% 4 5% 4 4 6% 7% 46%	3926
August	1st to 10th	Night	12% 7% 3 7% 4 4 5% 4 6% 8% 41%	2649
	11th to 20th	Night	13% 7% 2 7% 5% 3 5% 4 6% 7% 42%	2905
	21st to end	Night	11% 7% 2 7% 4 4 4 4 6% 9% 42%	3586
September	1st to 10th	Night	11% 6% 2 7% 4 4 5% 3 5% 6% 48%	2000
	11th to 20th	Night	14% 4 2 5% 3 3 3 3 5% 7% 51%	2003
	21st to end	Night	16% 6% 3 6% 4 4 4 3 4 6% 44%	2255
October	1st to 10th	Night	16% 8% 3 7% 4 4 4 3 5% 6% 40%	2400
	11th to 20th	Night	20% 9% 3 7% 5% 4 4 4 5% 6% 34%	2400
	21st to end	Night	23% 10% 3 7% 5% 5% 4 3 5% 6% 29%	2802
November	1st to 10th	Night	20% 10% 4 7% 4 5% 3 3 4 5% 34%	2667
	11th to 20th	Night	17% 11% 4 8% 6% 5% 5% 3 4 6% 32%	2916
	21st to end	Night	20% 14% 4 9% 6% 4 4 4 5% 5% 24%	2940
December	1st to 10th	Night	18% 17% 5% 11% 6% 6% 6% 4 5% 5% 17%	4720
	11th to 20th	Night	23% 15% 5% 10% 5% 4 4 3 4 4 25%	5348
	21st to end	Night	26% 17% 4 10% 4 3 4 3 4 4 20%	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	66% 3 13% 13% 4	4662
	11th to 20th	Day	67% 4 9% 11% 9% 1	4680
	21st to end	Day	67% 4 10% 11% 8% 1	5362
February	1st to 10th	Day	61% 4 9% 21% 4 1	1890
	11th to 20th	Day	59% 3 12% 18% 8% 1	1867
	21st to end	Day	63% 3 10% 14% 9% 1	1730
March	1st to 10th	Day	59% 4 9% 15% 11% 2	4579
	11th to 20th	Day	53% 4 16% 16% 9% 1	5082
	21st to end	Day	50% 3 7% 19% 18% 3	5908
April	1st to 10th	Day	54% 4 6% 19% 14% 3	2412
	11th to 20th	Day	52% 3 7% 21% 15% 2	2374
	21st to end	Day	55% 4 8% 16% 14% 4	2528
May	1st to 10th	Day	59% 5% 9% 18% 8% 2	6357
	11th to 20th	Day	54% 5% 12% 18% 10% 1	6322
	21st to end	Day	51% 4 12% 21% 11% 1	6949
June	1st to 10th	Day	53% 5% 10% 19% 12% 1	2800
	11th to 20th	Day	42% 5% 12% 25% 13% 2	2800
	21st to end	Day	49% 6% 12% 21% 11% 1	2800
July	1st to 10th	Day	45% 4 14% 27% 10%	6290
	11th to 20th	Day	38% 5% 14% 30% 13%	6285
	21st to end	Day	35% 5% 13% 37% 10%	6728
August	1st to 10th	Day	46% 5% 15% 25% 9%	4470
	11th to 20th	Day	43% 5% 14% 29% 9% 1	4149
	21st to end	Day	41% 4 16% 27% 11%	4312
September	1st to 10th	Day	39% 6% 14% 30% 12%	2400
	11th to 20th	Day	36% 4 12% 33% 14% 1	2396
	21st to end	Day	43% 6% 14% 26% 11%	2140
October	1st to 10th	Day	46% 4 11% 31% 8%	3260
	11th to 20th	Day	47% 4 15% 25% 8% 1	3240
	21st to end	Day	50% 3 17% 22% 7%	3262
November	1st to 10th	Day	50% 6% 13% 23% 7% 1	1851
	11th to 20th	Day	57% 5% 12% 16% 10% 1	1701
	21st to end	Day	65% 6% 12% 11% 6%	1680
December	1st to 10th	Day	72% 3 12% 10% 2	2680
	11th to 20th	Day	64% 4 10% 15% 6%	3066
	21st to end	Day	69% 4 8% 15% 4	4048
January	1st to 10th	Night	68% 3 11% 13% 5% 1	8234
	11th to 20th	Night	69% 3 9% 12% 6%	8280
	21st to end	Night	62% 4 7% 14% 11% 1	8817
February	1st to 10th	Night	61% 4 10% 17% 7% 1	2730
	11th to 20th	Night	59% 4 10% 20% 7%	2649
	21st to end	Night	58% 3 9% 19% 10% 1	2076
March	1st to 10th	Night	60% 3 6% 16% 12% 3	5494
	11th to 20th	Night	52% 4 18% 16% 8% 3	5095
	21st to end	Night	52% 3 6% 22% 14% 2	5265
April	1st to 10th	Night	54% 3 7% 20% 13% 2	2011
	11th to 20th	Night	51% 4 7% 21% 16% 1	1975
	21st to end	Night	51% 4 8% 18% 16% 3	1889
May	1st to 10th	Night	58% 5% 9% 18% 8% 3	3600
	11th to 20th	Night	45% 6% 14% 19% 15% 1	3576
	21st to end	Night	50% 5% 12% 18% 13% 1	3927
June	1st to 10th	Night	48% 5% 13% 21% 11% 1	1600
	11th to 20th	Night	40% 5% 13% 23% 17% 2	1600
	21st to end	Night	48% 6% 12% 20% 13% 1	1600
July	1st to 10th	Night	45% 4 17% 20% 13% 1	3560
	11th to 20th	Night	39% 4 13% 31% 12%	3552
	21st to end	Night	37% 5% 11% 30% 16%	3809
August	1st to 10th	Night	41% 5% 16% 26% 11% 1	2639
	11th to 20th	Night	42% 4 16% 29% 8% 1	2932
	21st to end	Night	39% 5% 15% 28% 12% 1	3586
September	1st to 10th	Night	38% 5% 12% 30% 15% 1	2000
	11th to 20th	Night	33% 5% 14% 36% 12% 1	2003
	21st to end	Night	42% 4 11% 29% 13%	2255
October	1st to 10th	Night	41% 4 13% 30% 12% 1	3920
	11th to 20th	Night	44% 4 15% 27% 10%	3899
	21st to end	Night	50% 4 16% 22% 8%	4527
November	1st to 10th	Night	52% 3 13% 22% 9% 1	2667
	11th to 20th	Night	54% 4 12% 18% 10% 1	2916
	21st to end	Night	62% 4 12% 16% 5%	2940
December	1st to 10th	Night	69% 3 12% 12% 3	4720
	11th to 20th	Night	64% 4 7% 15% 10% 1	5348
	21st to end	Night	69% 3 6% 13% 9%	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	25% 16% 35% 20% 4 1	220
	11th to 20th	Day	30% 17% 35% 12% 5% 1	220
	21st to end	Day	20% 20% 38% 15% 6%	286
February	1st to 10th	Day	29% 21% 34% 14% 2	330
	11th to 20th	Day	27% 25% 37% 11% 1	345
	21st to end	Day	28% 18% 36% 15% 2	446
March	1st to 10th	Day	26% 19% 33% 16% 5%	540
	11th to 20th	Day	29% 17% 33% 16% 3 1	540
	21st to end	Day	30% 21% 28% 14% 6% 2	594
April	1st to 10th	Day	30% 19% 30% 14% 5% 1	504
	11th to 20th	Day	33% 19% 24% 15% 8% 3	492
	21st to end	Day	34% 15% 31% 13% 6% 2	500
May	1st to 10th	Day	26% 14% 31% 20% 6% 2	503
	11th to 20th	Day	19% 16% 36% 18% 9% 2	527
	21st to end	Day	20% 14% 32% 24% 9% 1	573
June	1st to 10th	Day	24% 13% 29% 24% 9% 1	530
	11th to 20th	Day	16% 13% 35% 23% 10% 3	530
	21st to end	Day	22% 13% 34% 20% 9% 3	530
July	1st to 10th	Day	13% 7% 33% 30% 13% 3	525
	11th to 20th	Day	12% 9% 34% 29% 13% 3	524
	21st to end	Day	12% 10% 33% 27% 15% 3	576
August	1st to 10th	Day	13% 8% 27% 33% 15% 4	526
	11th to 20th	Day	15% 8% 23% 30% 16% 7%	519
	21st to end	Day	15% 9% 31% 26% 13% 7%	583
September	1st to 10th	Day	16% 11% 30% 21% 14% 8%	530
	11th to 20th	Day	12% 5% 26% 26% 19% 12%	530
	21st to end	Day	19% 9% 33% 19% 16% 4	530
October	1st to 10th	Day	22% 13% 26% 22% 11% 6%	530
	11th to 20th	Day	25% 18% 29% 21% 6% 2	530
	21st to end	Day	31% 16% 25% 24% 5%	492
November	1st to 10th	Day	27% 18% 30% 18% 7% 1	425
	11th to 20th	Day	26% 22% 33% 13% 4 2	241
	21st to end	Day	32% 19% 33% 12% 3 1	220
December	1st to 10th	Day	30% 19% 35% 13% 3	220
	11th to 20th	Day	32% 21% 34% 9% 4	220
	21st to end	Day	32% 19% 31% 13% 3 1	242
January	1st to 10th	Night	25% 15% 36% 19% 5%	840
	11th to 20th	Night	28% 17% 29% 20% 5%	840
	21st to end	Night	21% 13% 35% 25% 6% 1	924
February	1st to 10th	Night	22% 17% 35% 21% 4	840
	11th to 20th	Night	21% 18% 38% 19% 4	823
	21st to end	Night	23% 17% 34% 22% 3	692
March	1st to 10th	Night	25% 15% 35% 22% 4	840
	11th to 20th	Night	24% 19% 32% 19% 5%	840
	21st to end	Night	25% 15% 29% 24% 7%	924
April	1st to 10th	Night	27% 15% 29% 23% 5%	805
	11th to 20th	Night	25% 18% 27% 22% 8%	791
	21st to end	Night	27% 13% 29% 24% 6% 1	689
May	1st to 10th	Night	27% 8% 28% 28% 9% 1	400
	11th to 20th	Night	20% 11% 31% 27% 11%	394
	21st to end	Night	14% 8% 38% 28% 12%	433
June	1st to 10th	Night	18% 6% 32% 36% 8% 1	400
	11th to 20th	Night	16% 9% 31% 33% 12% 1	400
	21st to end	Night	20% 8% 32% 28% 13%	400
July	1st to 10th	Night	10% 7% 27% 44% 12% 1	390
	11th to 20th	Night	13% 4 26% 41% 15% 1	388
	21st to end	Night	10% 4 30% 43% 12% 1	438
August	1st to 10th	Night	13% 3 24% 41% 19%	435
	11th to 20th	Night	13% 3 22% 36% 23% 2	611
	21st to end	Night	14% 6% 29% 30% 19% 2	880
September	1st to 10th	Night	15% 5% 30% 33% 17% 1	800
	11th to 20th	Night	15% 5% 22% 31% 23% 4	800
	21st to end	Night	19% 8% 26% 26% 19% 2	800
October	1st to 10th	Night	20% 10% 28% 26% 16% 1	800
	11th to 20th	Night	24% 13% 29% 26% 7% 1	800
	21st to end	Night	28% 13% 27% 25% 6%	880
November	1st to 10th	Night	29% 13% 28% 22% 8% 1	820
	11th to 20th	Night	23% 18% 32% 17% 9% 1	840
	21st to end	Night	29% 17% 26% 21% 6%	840
December	1st to 10th	Night	29% 15% 30% 22% 4	840
	11th to 20th	Night	29% 17% 30% 19% 5% 1	840
	21st to end	Night	33% 15% 30% 18% 4	924

Page generated at 2026-03-30 02:18:43. Version ac07

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