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 2024-01-16.

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% 9% 4 7% 6% 3 5% 5% 5% 7% 33%	74760
	Night	18% 10% 4 7% 6% 3 4 4 5% 6% 33%	75039
Transparency	Day	51% 5% 12% 21% 10% 1	74465
	Night	53% 4 11% 20% 10% 1	74868
Seeing	Day	22% 14% 31% 21% 9% 3	13386
	Night	23% 12% 30% 25% 9% 1	22610

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% 18% 7% 10% 7% 3 5% 4 4 4 21%	1517
	11th to 20th	Day	19% 16% 5% 9% 7% 3 5% 3 4 5% 24%	1480
	21st to end	Day	13% 13% 5% 9% 8% 5% 6% 6% 6% 6% 24%	1654
February	1st to 10th	Day	16% 15% 5% 11% 8% 3 4 5% 4 6% 23%	1620
	11th to 20th	Day	14% 15% 5% 8% 7% 4 4 4 4 7% 28%	1586
	21st to end	Day	20% 14% 4 8% 7% 3 5% 5% 5% 5% 24%	1480
March	1st to 10th	Day	15% 12% 5% 10% 7% 3 5% 5% 4 5% 30%	1797
	11th to 20th	Day	17% 11% 5% 7% 6% 3 5% 4 4 6% 32%	1972
	21st to end	Day	20% 10% 4 5% 4 2 3 4 4 5% 37%	2298
April	1st to 10th	Day	22% 10% 4 6% 6% 3 4 3 4 6% 33%	2160
	11th to 20th	Day	21% 9% 3 5% 5% 3 4 3 4 5% 37%	2134
	21st to end	Day	23% 10% 3 7% 5% 3 4 4 4 6% 32%	2274
May	1st to 10th	Day	21% 8% 3 6% 6% 3 4 4 5% 7% 34%	2520
	11th to 20th	Day	17% 7% 3 5% 5% 3 4 4 5% 6% 40%	2478
	21st to end	Day	16% 6% 3 5% 6% 3 5% 5% 5% 7% 38%	2725
June	1st to 10th	Day	22% 7% 4 6% 6% 4 5% 5% 6% 7% 29%	2520
	11th to 20th	Day	16% 5% 3 5% 4 3 5% 6% 5% 8% 39%	2520
	21st to end	Day	18% 7% 3 7% 7% 3 5% 5% 6% 6% 33%	2520
July	1st to 10th	Day	12% 5% 2 5% 5% 3 5% 6% 7% 8% 41%	2520
	11th to 20th	Day	12% 6% 3 5% 5% 3 5% 6% 6% 10% 39%	2520
	21st to end	Day	11% 5% 3 5% 6% 3 6% 6% 7% 10% 38%	2744
August	1st to 10th	Day	12% 6% 3 6% 5% 4 5% 5% 6% 8% 40%	2471
	11th to 20th	Day	13% 6% 2 5% 5% 3 6% 5% 6% 8% 40%	2269
	21st to end	Day	13% 5% 2 6% 5% 4 5% 5% 6% 8% 41%	2376
September	1st to 10th	Day	14% 6% 2 6% 5% 3 5% 5% 6% 8% 41%	2160
	11th to 20th	Day	14% 5% 2 6% 5% 3 4 4 5% 8% 46%	2157
	21st to end	Day	17% 6% 3 5% 5% 3 4 6% 5% 7% 39%	1926
October	1st to 10th	Day	20% 8% 3 5% 6% 3 4 5% 5% 6% 35%	1800
	11th to 20th	Day	21% 8% 4 7% 7% 3 5% 5% 6% 7% 27%	1800
	21st to end	Day	26% 11% 3 6% 5% 3 5% 5% 4 5% 27%	1834
November	1st to 10th	Day	16% 9% 3 6% 6% 4 6% 6% 4 7% 33%	1671
	11th to 20th	Day	19% 13% 5% 7% 6% 3 5% 5% 5% 6% 28%	1539
	21st to end	Day	21% 13% 4 7% 7% 4 6% 5% 5% 5% 21%	1520
December	1st to 10th	Day	23% 15% 5% 10% 6% 4 6% 4 5% 5% 17%	1520
	11th to 20th	Day	22% 15% 4 9% 5% 3 4 4 4 5% 24%	1906
	21st to end	Day	27% 17% 5% 10% 6% 3 4 3 2 3 20%	2772
January	1st to 10th	Night	17% 16% 6% 11% 8% 4 5% 5% 4 5% 19%	2649
	11th to 20th	Night	19% 16% 5% 11% 7% 5% 4 3 4 4 22%	2602
	21st to end	Night	13% 14% 6% 9% 7% 4 4 4 4 6% 29%	2700
February	1st to 10th	Night	15% 14% 6% 11% 8% 4 5% 5% 4 6% 22%	2340
	11th to 20th	Night	14% 13% 5% 10% 7% 3 5% 5% 4 5% 29%	2259
	21st to end	Night	16% 13% 5% 7% 8% 4 4 4 5% 5% 29%	1776
March	1st to 10th	Night	17% 14% 5% 8% 7% 3 5% 4 4 5% 29%	2150
	11th to 20th	Night	17% 13% 4 7% 5% 3 3 3 4 5% 35%	1984
	21st to end	Night	19% 8% 3 6% 6% 4 4 3 4 4 40%	2057
April	1st to 10th	Night	21% 10% 4 6% 5% 4 4 3 4 6% 34%	1800
	11th to 20th	Night	20% 8% 3 6% 6% 3 4 3 4 5% 37%	1775
	21st to end	Night	23% 9% 3 6% 6% 2 4 3 4 7% 32%	1701
May	1st to 10th	Night	23% 6% 3 5% 4 3 5% 5% 5% 5% 36%	1440
	11th to 20th	Night	18% 8% 3 4 5% 2 4 5% 5% 7% 40%	1415
	21st to end	Night	13% 7% 2 4 4 3 4 4 6% 8% 44%	1550
June	1st to 10th	Night	17% 7% 3 5% 6% 4 5% 6% 6% 8% 33%	1440
	11th to 20th	Night	15% 6% 3 5% 5% 3 4 5% 6% 9% 41%	1440
	21st to end	Night	17% 7% 2 6% 6% 3 4 5% 5% 8% 36%	1440
July	1st to 10th	Night	10% 5% 3 5% 6% 3 5% 5% 5% 8% 45%	1440
	11th to 20th	Night	12% 4 3 5% 4 3 5% 6% 5% 9% 44%	1440
	21st to end	Night	10% 4 3 5% 5% 3 5% 6% 7% 9% 44%	1574
August	1st to 10th	Night	9% 6% 3 7% 5% 3 4 5% 5% 9% 43%	1465
	11th to 20th	Night	10% 6% 3 6% 6% 3 4 4 6% 7% 45%	1613
	21st to end	Night	11% 6% 2 5% 4 3 4 5% 6% 8% 45%	1980
September	1st to 10th	Night	12% 5% 2 7% 5% 3 5% 4 4 6% 47%	1800
	11th to 20th	Night	15% 4 2 4 4 2 3 4 5% 7% 49%	1802
	21st to end	Night	16% 6% 3 5% 5% 3 4 4 4 6% 44%	2029
October	1st to 10th	Night	17% 8% 3 6% 5% 3 4 4 5% 7% 37%	2160
	11th to 20th	Night	21% 9% 3 6% 6% 3 4 5% 4 6% 32%	2160
	21st to end	Night	24% 9% 4 7% 5% 4 4 4 4 6% 28%	2521
November	1st to 10th	Night	20% 10% 4 6% 5% 3 4 3 4 5% 36%	2407
	11th to 20th	Night	18% 10% 4 7% 7% 3 6% 4 4 6% 32%	2638
	21st to end	Night	21% 12% 4 8% 7% 3 4 4 5% 5% 25%	2660
December	1st to 10th	Night	21% 16% 5% 8% 7% 5% 5% 5% 5% 5% 17%	2660
	11th to 20th	Night	23% 14% 5% 8% 6% 3 3 3 3 4 26%	3288
	21st to end	Night	31% 16% 4 10% 5% 3 3 4 3 4 18%	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	67% 4 10% 13% 5%	1518
	11th to 20th	Day	65% 4 9% 12% 10% 1	1480
	21st to end	Day	61% 5% 12% 14% 8% 1	1654
February	1st to 10th	Day	63% 3 9% 20% 4 2	1620
	11th to 20th	Day	58% 3 12% 17% 8% 1	1595
	21st to end	Day	62% 3 11% 14% 9% 1	1480
March	1st to 10th	Day	57% 3 10% 18% 10% 1	1800
	11th to 20th	Day	54% 3 12% 16% 11% 3	1972
	21st to end	Day	49% 4 9% 19% 14% 5%	2298
April	1st to 10th	Day	53% 4 7% 20% 13% 3	2160
	11th to 20th	Day	50% 4 7% 22% 15% 2	2134
	21st to end	Day	55% 3 8% 16% 14% 4	2274
May	1st to 10th	Day	50% 4 8% 20% 15% 4	2520
	11th to 20th	Day	45% 4 9% 22% 17% 3	2482
	21st to end	Day	45% 5% 13% 21% 14% 2	2725
June	1st to 10th	Day	54% 5% 10% 18% 12% 1	2520
	11th to 20th	Day	43% 6% 11% 25% 13% 2	2520
	21st to end	Day	50% 7% 12% 20% 11% 1	2520
July	1st to 10th	Day	37% 6% 12% 28% 15% 1	2450
	11th to 20th	Day	39% 6% 17% 28% 10%	2445
	21st to end	Day	41% 8% 15% 26% 10%	2591
August	1st to 10th	Day	42% 6% 15% 26% 10%	2457
	11th to 20th	Day	40% 6% 16% 26% 11% 1	2269
	21st to end	Day	40% 5% 14% 28% 12% 1	2376
September	1st to 10th	Day	40% 6% 14% 28% 12%	2160
	11th to 20th	Day	38% 5% 12% 32% 13% 1	2157
	21st to end	Day	43% 7% 14% 28% 9%	1926
October	1st to 10th	Day	50% 5% 11% 23% 11% 1	1800
	11th to 20th	Day	56% 5% 15% 17% 6% 1	1800
	21st to end	Day	61% 4 11% 16% 8%	1834
November	1st to 10th	Day	49% 6% 14% 23% 7% 1	1671
	11th to 20th	Day	57% 5% 12% 16% 10% 1	1539
	21st to end	Day	64% 6% 12% 12% 6%	1520
December	1st to 10th	Day	70% 4 12% 11% 3 1	1520
	11th to 20th	Day	64% 4 13% 15% 4	1906
	21st to end	Day	72% 4 7% 14% 3	2772
January	1st to 10th	Night	67% 4 10% 12% 6%	2649
	11th to 20th	Night	67% 3 9% 12% 8% 1	2602
	21st to end	Night	57% 4 9% 18% 10% 1	2700
February	1st to 10th	Night	63% 4 10% 15% 7% 1	2340
	11th to 20th	Night	58% 4 10% 20% 7% 1	2261
	21st to end	Night	57% 3 9% 19% 11% 1	1776
March	1st to 10th	Night	58% 4 10% 16% 10% 2	2160
	11th to 20th	Night	53% 3 10% 20% 12% 2	1985
	21st to end	Night	49% 4 7% 20% 16% 4	2057
April	1st to 10th	Night	53% 3 8% 21% 14% 2	1800
	11th to 20th	Night	50% 4 8% 21% 16% 2	1775
	21st to end	Night	52% 4 8% 16% 16% 3	1701
May	1st to 10th	Night	48% 5% 7% 20% 15% 5%	1440
	11th to 20th	Night	44% 5% 7% 22% 19% 2	1416
	21st to end	Night	37% 5% 17% 21% 17% 2	1551
June	1st to 10th	Night	48% 6% 14% 21% 10% 1	1440
	11th to 20th	Night	40% 5% 13% 22% 17% 3	1440
	21st to end	Night	47% 6% 13% 20% 13% 1	1440
July	1st to 10th	Night	35% 6% 11% 28% 17% 2	1400
	11th to 20th	Night	37% 5% 14% 32% 13%	1392
	21st to end	Night	36% 7% 15% 27% 14% 1	1486
August	1st to 10th	Night	38% 7% 18% 24% 13% 1	1455
	11th to 20th	Night	39% 5% 16% 28% 12% 1	1613
	21st to end	Night	36% 6% 16% 29% 13% 1	1980
September	1st to 10th	Night	39% 5% 12% 28% 15% 1	1800
	11th to 20th	Night	34% 5% 14% 35% 10% 1	1802
	21st to end	Night	42% 4 11% 31% 11%	2029
October	1st to 10th	Night	47% 4 11% 24% 13% 1	2160
	11th to 20th	Night	53% 5% 12% 21% 9%	2160
	21st to end	Night	58% 4 13% 16% 9%	2521
November	1st to 10th	Night	51% 3 14% 22% 9% 1	2407
	11th to 20th	Night	54% 4 13% 18% 10% 1	2638
	21st to end	Night	61% 4 13% 16% 5%	2660
December	1st to 10th	Night	68% 5% 9% 13% 4	2660
	11th to 20th	Night	62% 4 9% 16% 8% 1	3288
	21st to end	Night	73% 3 7% 13% 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	24% 18% 31% 21% 4 1	180
	11th to 20th	Day	32% 17% 32% 14% 5% 1	170
	21st to end	Day	22% 20% 36% 15% 7%	208
February	1st to 10th	Day	33% 24% 34% 9%	240
	11th to 20th	Day	29% 23% 40% 8%	253
	21st to end	Day	29% 18% 35% 16% 3	346
March	1st to 10th	Day	25% 17% 33% 18% 6%	420
	11th to 20th	Day	27% 16% 35% 17% 4 1	420
	21st to end	Day	29% 20% 27% 16% 7% 2	462
April	1st to 10th	Day	28% 18% 32% 15% 6% 1	420
	11th to 20th	Day	30% 18% 23% 17% 9% 3	412
	21st to end	Day	33% 15% 29% 15% 6% 2	420
May	1st to 10th	Day	25% 14% 32% 20% 7% 2	423
	11th to 20th	Day	18% 17% 38% 18% 8% 3	447
	21st to end	Day	18% 14% 34% 23% 9% 1	485
June	1st to 10th	Day	25% 12% 29% 24% 9% 2	450
	11th to 20th	Day	17% 13% 32% 24% 10% 3	450
	21st to end	Day	21% 10% 34% 21% 11% 3	450
July	1st to 10th	Day	13% 6% 30% 32% 15% 4	445
	11th to 20th	Day	13% 8% 33% 28% 14% 4	444
	21st to end	Day	13% 8% 32% 29% 15% 3	488
August	1st to 10th	Day	13% 9% 28% 30% 16% 4	446
	11th to 20th	Day	14% 8% 23% 30% 17% 8%	439
	21st to end	Day	14% 9% 30% 25% 13% 8%	495
September	1st to 10th	Day	15% 11% 30% 21% 14% 9%	450
	11th to 20th	Day	14% 6% 29% 23% 18% 10%	450
	21st to end	Day	18% 9% 32% 19% 16% 5%	450
October	1st to 10th	Day	24% 13% 26% 20% 11% 6%	450
	11th to 20th	Day	26% 18% 27% 21% 6% 2	450
	21st to end	Day	31% 16% 24% 24% 4	421
November	1st to 10th	Day	25% 18% 30% 18% 8% 1	365
	11th to 20th	Day	28% 21% 33% 12% 5% 3	199
	21st to end	Day	27% 19% 34% 14% 4 1	180
December	1st to 10th	Day	30% 18% 37% 12% 2 1	180
	11th to 20th	Day	31% 23% 32% 10% 3 1	180
	21st to end	Day	33% 21% 29% 14% 2 1	198
January	1st to 10th	Night	26% 16% 35% 19% 5%	760
	11th to 20th	Night	28% 17% 30% 20% 5%	744
	21st to end	Night	20% 13% 35% 25% 6% 1	792
February	1st to 10th	Night	25% 17% 35% 19% 4	720
	11th to 20th	Night	21% 18% 38% 19% 4	703
	21st to end	Night	24% 17% 33% 21% 4	592
March	1st to 10th	Night	25% 14% 35% 23% 3	720
	11th to 20th	Night	24% 19% 32% 19% 6%	720
	21st to end	Night	24% 14% 28% 26% 8%	792
April	1st to 10th	Night	26% 15% 29% 24% 6%	720
	11th to 20th	Night	24% 18% 28% 22% 8%	711
	21st to end	Night	27% 13% 28% 25% 7% 1	621
May	1st to 10th	Night	27% 8% 28% 27% 9% 1	360
	11th to 20th	Night	21% 11% 31% 26% 11%	354
	21st to end	Night	14% 8% 37% 27% 13%	389
June	1st to 10th	Night	19% 5% 32% 35% 8% 1	360
	11th to 20th	Night	16% 9% 29% 33% 13% 1	360
	21st to end	Night	17% 8% 31% 30% 14%	360
July	1st to 10th	Night	9% 7% 27% 43% 13% 1	350
	11th to 20th	Night	14% 3 25% 41% 16% 1	348
	21st to end	Night	10% 4 31% 42% 12% 2	394
August	1st to 10th	Night	13% 4 25% 39% 19% 1	391
	11th to 20th	Night	13% 3 22% 36% 23% 3	549
	21st to end	Night	14% 6% 28% 30% 19% 2	792
September	1st to 10th	Night	16% 5% 30% 32% 16% 1	720
	11th to 20th	Night	17% 6% 24% 31% 20% 3	720
	21st to end	Night	18% 8% 26% 26% 19% 2	720
October	1st to 10th	Night	21% 10% 27% 25% 15% 1	720
	11th to 20th	Night	25% 13% 28% 25% 8% 1	720
	21st to end	Night	29% 14% 28% 24% 6%	792
November	1st to 10th	Night	28% 13% 29% 21% 9% 1	740
	11th to 20th	Night	23% 18% 32% 17% 9% 1	760
	21st to end	Night	30% 16% 26% 21% 6%	760
December	1st to 10th	Night	30% 14% 30% 21% 4 1	760
	11th to 20th	Night	29% 16% 30% 19% 5% 1	760
	21st to end	Night	33% 15% 30% 18% 3	836

Page generated at 2024-01-13 09:37:54. Version ac07

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