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 2024-12-09.

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% 10% 3 8% 5% 5% 5% 4 5% 7% 33%	101856
	Night	17% 11% 4 8% 5% 4 4 3 5% 6% 32%	97920
Transparency	Day	50% 5% 12% 22% 10% 1	105339
	Night	52% 4 12% 21% 10% 1	102526
Seeing	Day	22% 14% 31% 21% 9% 3	14576
	Night	23% 12% 30% 25% 9% 1	23704

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% 17% 5% 12% 7% 5% 5% 3 4 5% 22%	2517
	11th to 20th	Day	14% 14% 5% 12% 7% 6% 5% 4 4 5% 22%	2520
	21st to end	Day	16% 17% 6% 12% 6% 7% 6% 4 5% 5% 17%	2898
February	1st to 10th	Day	15% 16% 4 12% 7% 4 4 4 4 5% 24%	1710
	11th to 20th	Day	13% 16% 5% 10% 7% 5% 4 3 5% 6% 27%	1676
	21st to end	Day	20% 14% 3 9% 6% 4 5% 4 6% 5% 25%	1570
March	1st to 10th	Day	20% 14% 3 9% 6% 5% 4 3 4 5% 27%	3116
	11th to 20th	Day	12% 15% 5% 9% 6% 5% 5% 3 5% 6% 29%	3472
	21st to end	Day	14% 9% 3 6% 4 4 4 3 5% 6% 42%	4032
April	1st to 10th	Day	22% 11% 3 8% 5% 3 4 3 4 6% 32%	2280
	11th to 20th	Day	21% 10% 3 6% 5% 4 3 2 4 5% 36%	2254
	21st to end	Day	23% 10% 3 7% 5% 4 4 3 4 6% 32%	2401
May	1st to 10th	Day	20% 8% 3 7% 5% 4 4 4 5% 7% 31%	4426
	11th to 20th	Day	18% 10% 3 7% 5% 5% 5% 3 5% 6% 33%	4398
	21st to end	Day	15% 7% 2 6% 5% 4 5% 4 6% 8% 38%	4837
June	1st to 10th	Day	22% 9% 3 6% 5% 6% 4 4 6% 6% 29%	2660
	11th to 20th	Day	15% 6% 3 6% 4 4 5% 5% 6% 8% 38%	2660
	21st to end	Day	19% 7% 3 7% 6% 4 5% 4 6% 6% 32%	2660
July	1st to 10th	Day	12% 6% 2 7% 5% 5% 5% 5% 8% 9% 35%	4440
	11th to 20th	Day	13% 6% 2 6% 4 5% 5% 5% 6% 9% 40%	4440
	21st to end	Day	10% 6% 2 6% 4 4 5% 4 7% 9% 43%	4814
August	1st to 10th	Day	15% 8% 3 8% 4 5% 5% 4 5% 8% 36%	4346
	11th to 20th	Day	17% 7% 2 6% 4 4 5% 4 6% 8% 39%	3982
	21st to end	Day	15% 5% 2 6% 4 4 5% 4 6% 9% 39%	4180
September	1st to 10th	Day	13% 6% 2 6% 4 4 4 4 6% 8% 42%	2280
	11th to 20th	Day	13% 5% 2 6% 4 4 4 4 4 8% 47%	2276
	21st to end	Day	17% 6% 2 5% 4 4 4 4 5% 7% 40%	2033
October	1st to 10th	Day	20% 8% 2 6% 5% 4 5% 3 5% 6% 36%	1900
	11th to 20th	Day	20% 9% 4 9% 5% 4 5% 4 6% 6% 28%	1900
	21st to end	Day	25% 11% 3 7% 4 5% 4 3 4 5% 28%	1935
November	1st to 10th	Day	16% 9% 3 8% 5% 6% 6% 4 4 7% 33%	1761
	11th to 20th	Day	17% 13% 4 8% 5% 4 4 3 5% 6% 29%	1620
	21st to end	Day	21% 14% 4 8% 6% 5% 6% 4 5% 5% 21%	1600
December	1st to 10th	Day	22% 17% 4 11% 6% 5% 4 4 5% 5% 17%	1584
	11th to 20th	Day	22% 15% 4 9% 5% 5% 4 4 4 4 24%	1906
	21st to end	Day	27% 17% 5% 11% 5% 4 4 2 2 3 20%	2772
January	1st to 10th	Night	17% 16% 6% 11% 6% 5% 4 4 5% 5% 21%	4429
	11th to 20th	Night	13% 15% 5% 13% 7% 6% 5% 4 5% 5% 21%	4440
	21st to end	Night	18% 19% 6% 11% 5% 4 4 3 3 5% 21%	4756
February	1st to 10th	Night	14% 16% 5% 12% 7% 5% 4 4 5% 6% 22%	2470
	11th to 20th	Night	13% 14% 5% 12% 6% 5% 4 4 5% 5% 29%	2389
	21st to end	Night	16% 14% 4 8% 7% 5% 4 3 5% 5% 29%	1884
March	1st to 10th	Night	21% 12% 4 8% 4 4 4 2 4 4 32%	3724
	11th to 20th	Night	18% 16% 4 9% 5% 4 3 3 5% 5% 27%	3484
	21st to end	Night	16% 10% 3 6% 4 4 3 3 5% 5% 41%	3599
April	1st to 10th	Night	20% 11% 3 7% 5% 5% 4 2 5% 5% 33%	1900
	11th to 20th	Night	19% 9% 3 8% 5% 4 3 3 5% 5% 36%	1875
	21st to end	Night	22% 9% 3 7% 5% 3 4 3 4 7% 33%	1795
May	1st to 10th	Night	21% 8% 3 7% 4 5% 6% 4 6% 6% 29%	2514
	11th to 20th	Night	20% 8% 3 6% 4 4 4 4 5% 6% 35%	2495
	21st to end	Night	13% 7% 2 6% 4 4 4 4 6% 8% 40%	2738
June	1st to 10th	Night	16% 8% 3 7% 6% 5% 5% 5% 6% 8% 32%	1520
	11th to 20th	Night	15% 6% 3 5% 4 4 4 4 6% 9% 40%	1520
	21st to end	Night	18% 8% 2 7% 5% 4 4 4 6% 8% 35%	1520
July	1st to 10th	Night	12% 7% 4 8% 6% 5% 5% 5% 6% 8% 36%	2520
	11th to 20th	Night	14% 5% 2 6% 4 4 5% 4 5% 8% 43%	2520
	21st to end	Night	11% 6% 2 7% 4 4 4 4 6% 7% 43%	2739
August	1st to 10th	Night	12% 7% 3 7% 4 4 5% 4 5% 8% 40%	2567
	11th to 20th	Night	13% 7% 2 7% 5% 3 5% 4 6% 7% 41%	2814
	21st to end	Night	11% 7% 2 7% 4 4 4 4 6% 9% 42%	3476
September	1st to 10th	Night	12% 6% 2 7% 4 4 5% 3 4 6% 47%	1900
	11th to 20th	Night	14% 4 2 5% 3 3 3 3 5% 7% 50%	1903
	21st to end	Night	16% 6% 3 6% 4 4 4 3 4 6% 44%	2142
October	1st to 10th	Night	17% 8% 3 7% 4 4 4 3 6% 7% 38%	2280
	11th to 20th	Night	20% 10% 3 7% 5% 4 4 4 4 6% 33%	2280
	21st to end	Night	23% 10% 3 8% 5% 5% 4 3 4 6% 28%	2662
November	1st to 10th	Night	20% 10% 4 7% 4 5% 3 3 4 5% 35%	2537
	11th to 20th	Night	17% 11% 4 8% 6% 5% 5% 3 4 6% 32%	2777
	21st to end	Night	21% 14% 4 9% 6% 4 4 4 5% 6% 24%	2800
December	1st to 10th	Night	20% 17% 5% 10% 6% 6% 5% 4 5% 4 17%	2779
	11th to 20th	Night	22% 15% 5% 9% 5% 4 3 3 3 4 26%	3288
	21st to end	Night	30% 17% 4 11% 4 4 3 3 3 3 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	65% 4 15% 9% 5% 1	2518
	11th to 20th	Day	63% 5% 12% 13% 7% 1	2520
	21st to end	Day	69% 5% 11% 9% 5%	2898
February	1st to 10th	Day	62% 4 9% 21% 4 1	1710
	11th to 20th	Day	58% 3 12% 17% 8% 1	1685
	21st to end	Day	61% 3 11% 14% 10% 1	1570
March	1st to 10th	Day	59% 4 9% 18% 9%	3119
	11th to 20th	Day	56% 4 12% 16% 9% 2	3472
	21st to end	Day	43% 4 9% 23% 18% 3	4032
April	1st to 10th	Day	53% 4 6% 20% 13% 3	2280
	11th to 20th	Day	51% 4 7% 21% 15% 2	2254
	21st to end	Day	55% 3 8% 16% 14% 4	2401
May	1st to 10th	Day	51% 5% 10% 21% 10% 2	4440
	11th to 20th	Day	51% 5% 12% 20% 10% 1	4402
	21st to end	Day	43% 5% 12% 23% 15% 1	4837
June	1st to 10th	Day	54% 5% 10% 19% 12% 1	2660
	11th to 20th	Day	43% 5% 12% 25% 13% 2	2660
	21st to end	Day	50% 7% 12% 20% 11% 1	2660
July	1st to 10th	Day	42% 5% 14% 26% 12% 1	4370
	11th to 20th	Day	39% 5% 15% 32% 8%	4365
	21st to end	Day	37% 6% 13% 33% 11%	4661
August	1st to 10th	Day	47% 5% 14% 24% 9%	4332
	11th to 20th	Day	43% 5% 14% 29% 8%	4021
	21st to end	Day	41% 4 16% 26% 12%	4180
September	1st to 10th	Day	40% 6% 14% 28% 12%	2280
	11th to 20th	Day	37% 4 12% 32% 14% 1	2276
	21st to end	Day	42% 7% 14% 27% 10%	2033
October	1st to 10th	Day	47% 4 11% 30% 8%	3160
	11th to 20th	Day	47% 4 15% 26% 8%	3140
	21st to end	Day	50% 3 18% 22% 7%	3160
November	1st to 10th	Day	49% 6% 14% 23% 7% 1	1761
	11th to 20th	Day	56% 5% 11% 17% 10% 1	1620
	21st to end	Day	64% 6% 12% 12% 6%	1600
December	1st to 10th	Day	70% 4 13% 11% 2 1	1584
	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	65% 4 15% 12% 4	4429
	11th to 20th	Night	65% 4 15% 11% 5%	4440
	21st to end	Night	67% 4 10% 11% 6% 1	4756
February	1st to 10th	Night	62% 4 11% 16% 7% 1	2470
	11th to 20th	Night	58% 4 10% 20% 8% 1	2391
	21st to end	Night	57% 3 9% 19% 10% 1	1884
March	1st to 10th	Night	55% 4 9% 21% 9% 2	3734
	11th to 20th	Night	59% 3 13% 15% 8% 1	3485
	21st to end	Night	45% 3 6% 23% 19% 3	3599
April	1st to 10th	Night	53% 3 7% 20% 14% 2	1900
	11th to 20th	Night	51% 4 7% 21% 16% 1	1875
	21st to end	Night	51% 4 8% 17% 16% 3	1795
May	1st to 10th	Night	53% 5% 10% 20% 9% 3	2520
	11th to 20th	Night	48% 6% 12% 21% 12% 1	2496
	21st to end	Night	40% 6% 14% 21% 17% 2	2739
June	1st to 10th	Night	48% 6% 13% 21% 11% 1	1520
	11th to 20th	Night	40% 5% 13% 23% 17% 2	1520
	21st to end	Night	48% 6% 13% 20% 13% 1	1520
July	1st to 10th	Night	45% 5% 14% 21% 14% 1	2480
	11th to 20th	Night	39% 5% 14% 34% 8%	2472
	21st to end	Night	40% 6% 14% 24% 15% 1	2651
August	1st to 10th	Night	42% 5% 15% 26% 11% 1	2557
	11th to 20th	Night	42% 4 17% 30% 7%	2841
	21st to end	Night	38% 5% 16% 27% 12% 1	3476
September	1st to 10th	Night	38% 5% 12% 29% 15% 1	1900
	11th to 20th	Night	33% 5% 14% 36% 11% 1	1903
	21st to end	Night	42% 4 12% 30% 12%	2142
October	1st to 10th	Night	42% 4 13% 30% 11%	3800
	11th to 20th	Night	44% 4 15% 27% 9%	3779
	21st to end	Night	50% 4 16% 21% 8%	4387
November	1st to 10th	Night	52% 3 13% 22% 9% 1	2537
	11th to 20th	Night	54% 4 12% 18% 10% 1	2777
	21st to end	Night	61% 4 13% 16% 5%	2800
December	1st to 10th	Night	69% 5% 9% 13% 4	2779
	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	31% 17% 33% 13% 6% 1	180
	21st to end	Day	21% 18% 37% 17% 6%	234
February	1st to 10th	Day	30% 22% 34% 12% 1	270
	11th to 20th	Day	28% 24% 39% 9%	283
	21st to end	Day	28% 18% 35% 15% 3	382
March	1st to 10th	Day	26% 17% 33% 18% 6%	460
	11th to 20th	Day	26% 18% 35% 17% 3 1	460
	21st to end	Day	29% 21% 27% 15% 6% 2	506
April	1st to 10th	Day	29% 18% 32% 15% 5% 1	460
	11th to 20th	Day	32% 19% 23% 16% 8% 2	452
	21st to end	Day	33% 15% 29% 15% 6% 2	460
May	1st to 10th	Day	25% 14% 31% 21% 7% 2	463
	11th to 20th	Day	18% 16% 36% 18% 9% 2	487
	21st to end	Day	19% 15% 33% 24% 10% 1	529
June	1st to 10th	Day	25% 12% 28% 25% 9% 1	490
	11th to 20th	Day	17% 13% 33% 24% 10% 3	490
	21st to end	Day	23% 12% 33% 20% 10% 3	490
July	1st to 10th	Day	13% 7% 32% 31% 14% 4	485
	11th to 20th	Day	13% 9% 33% 29% 13% 4	484
	21st to end	Day	13% 8% 32% 29% 15% 3	532
August	1st to 10th	Day	14% 9% 28% 30% 15% 4	486
	11th to 20th	Day	15% 8% 22% 30% 17% 8%	479
	21st to end	Day	14% 9% 30% 26% 13% 8%	539
September	1st to 10th	Day	16% 11% 31% 21% 13% 8%	490
	11th to 20th	Day	13% 6% 27% 23% 19% 12%	490
	21st to end	Day	19% 9% 32% 19% 17% 5%	490
October	1st to 10th	Day	24% 13% 26% 21% 11% 5%	490
	11th to 20th	Day	25% 18% 28% 21% 6% 2	490
	21st to end	Day	31% 16% 25% 23% 4	456
November	1st to 10th	Day	26% 17% 31% 18% 7% 1	395
	11th to 20th	Day	26% 22% 32% 12% 5% 2	220
	21st to end	Day	30% 20% 33% 14% 4 1	200
December	1st to 10th	Day	29% 18% 37% 12% 3 1	196
	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	27% 17% 30% 21% 5%	760
	21st to end	Night	21% 13% 34% 26% 6% 1	836
February	1st to 10th	Night	24% 17% 35% 21% 4	760
	11th to 20th	Night	21% 18% 37% 20% 4	743
	21st to end	Night	24% 18% 33% 21% 4	628
March	1st to 10th	Night	25% 14% 35% 23% 3	760
	11th to 20th	Night	24% 19% 32% 19% 6%	760
	21st to end	Night	24% 15% 28% 26% 7%	836
April	1st to 10th	Night	26% 15% 29% 24% 6%	760
	11th to 20th	Night	25% 18% 27% 22% 8%	751
	21st to end	Night	27% 13% 29% 24% 7% 1	655
May	1st to 10th	Night	26% 8% 28% 27% 9% 1	380
	11th to 20th	Night	21% 11% 30% 27% 11%	374
	21st to end	Night	14% 8% 39% 27% 12%	411
June	1st to 10th	Night	18% 6% 32% 36% 8% 1	380
	11th to 20th	Night	16% 9% 29% 34% 12% 1	380
	21st to end	Night	19% 8% 31% 28% 13%	380
July	1st to 10th	Night	10% 7% 26% 44% 12% 1	370
	11th to 20th	Night	14% 4 25% 40% 16% 1	368
	21st to end	Night	10% 4 30% 42% 13% 1	416
August	1st to 10th	Night	14% 3 24% 40% 18%	413
	11th to 20th	Night	13% 3 22% 36% 24% 2	580
	21st to end	Night	14% 6% 28% 30% 19% 2	836
September	1st to 10th	Night	16% 5% 30% 33% 16% 1	760
	11th to 20th	Night	16% 5% 23% 31% 22% 4	760
	21st to end	Night	18% 8% 26% 26% 19% 2	760
October	1st to 10th	Night	20% 10% 28% 25% 16% 1	760
	11th to 20th	Night	25% 13% 28% 25% 8% 1	760
	21st to end	Night	28% 14% 28% 24% 6%	836
November	1st to 10th	Night	28% 14% 28% 22% 8% 1	780
	11th to 20th	Night	23% 18% 32% 18% 9% 1	800
	21st to end	Night	30% 17% 27% 21% 6%	800
December	1st to 10th	Night	30% 14% 30% 21% 4 1	795
	11th to 20th	Night	29% 16% 30% 19% 5% 1	760
	21st to end	Night	33% 15% 30% 18% 3	836

Page generated at 2024-12-06 03:54:50. Version ac07

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