West Carry Pond
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the West Carry Pond clear sky chart from 2005-11-06 to 2026-06-16.

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	15% 10% 3 9% 6% 5% 5% 4 6% 7% 30%	136780
	Night	14% 10% 4 9% 6% 5% 5% 4 6% 7% 30%	135289
Transparency	Day	50% 6% 11% 20% 11% 2	140263
	Night	50% 6% 12% 20% 11% 1	139896
Seeing	Day	27% 21% 28% 16% 6% 2	17398
	Night	25% 18% 27% 23% 8% 1	25985

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	10% 10% 5% 11% 7% 7% 6% 4 5% 6% 29%	4661
	11th to 20th	Day	8% 12% 6% 14% 7% 7% 6% 3 5% 6% 25%	4650
	21st to end	Day	6% 8% 4 10% 6% 6% 7% 5% 7% 6% 35%	5124
February	1st to 10th	Day	11% 12% 4 9% 7% 6% 7% 4 6% 6% 28%	1804
	11th to 20th	Day	9% 12% 4 12% 8% 7% 5% 4 6% 6% 28%	2017
	21st to end	Day	11% 13% 4 10% 5% 5% 6% 5% 6% 6% 29%	1730
March	1st to 10th	Day	15% 16% 5% 12% 6% 4 4 3 4 5% 26%	4576
	11th to 20th	Day	14% 11% 4 10% 7% 5% 5% 4 5% 6% 30%	4986
	21st to end	Day	18% 13% 4 8% 5% 5% 4 3 4 6% 29%	5760
April	1st to 10th	Day	17% 14% 4 9% 5% 4 4 3 5% 6% 29%	2520
	11th to 20th	Day	16% 12% 3 8% 5% 4 4 4 5% 7% 33%	2622
	21st to end	Day	20% 12% 3 9% 5% 4 4 4 4 6% 30%	2730
May	1st to 10th	Day	24% 12% 4 9% 5% 5% 5% 4 5% 5% 21%	7639
	11th to 20th	Day	17% 11% 3 8% 6% 6% 6% 5% 6% 7% 26%	7937
	21st to end	Day	17% 9% 3 8% 5% 5% 5% 4 6% 7% 29%	9060
June	1st to 10th	Day	23% 9% 3 7% 5% 4 5% 4 6% 7% 28%	3129
	11th to 20th	Day	16% 7% 3 7% 6% 5% 5% 4 6% 8% 33%	3075
	21st to end	Day	21% 8% 3 8% 6% 5% 5% 4 6% 7% 28%	2971
July	1st to 10th	Day	13% 8% 3 7% 5% 6% 6% 5% 9% 10% 28%	6360
	11th to 20th	Day	12% 6% 3 8% 5% 5% 5% 5% 6% 9% 36%	6360
	21st to end	Day	11% 7% 3 7% 4 4 5% 4 6% 8% 39%	6926
August	1st to 10th	Day	14% 6% 2 8% 6% 6% 7% 6% 7% 9% 30%	4339
	11th to 20th	Day	14% 9% 4 8% 6% 6% 6% 4 6% 8% 29%	4175
	21st to end	Day	12% 7% 3 7% 5% 5% 5% 5% 7% 7% 37%	4524
September	1st to 10th	Day	11% 5% 2 7% 4 4 5% 4 6% 7% 44%	2363
	11th to 20th	Day	12% 6% 3 5% 4 3 4 4 4 6% 49%	2200
	21st to end	Day	14% 7% 3 7% 5% 4 5% 4 6% 8% 38%	2200
October	1st to 10th	Day	16% 9% 3 7% 4 4 4 3 6% 7% 37%	2198
	11th to 20th	Day	16% 11% 3 8% 5% 5% 4 3 5% 7% 33%	1892
	21st to end	Day	20% 14% 4 9% 6% 4 4 3 5% 6% 26%	1980
November	1st to 10th	Day	15% 11% 4 9% 5% 4 5% 3 5% 6% 33%	1851
	11th to 20th	Day	16% 9% 5% 8% 6% 6% 5% 4 5% 6% 30%	1890
	21st to end	Day	18% 11% 3 9% 5% 4 4 4 6% 8% 27%	1696
December	1st to 10th	Day	10% 15% 4 11% 9% 7% 5% 5% 4 6% 23%	2350
	11th to 20th	Day	16% 10% 3 9% 6% 5% 5% 4 6% 5% 33%	2688
	21st to end	Day	17% 12% 4 9% 5% 4 5% 4 6% 6% 27%	3797
January	1st to 10th	Night	9% 11% 4 11% 6% 6% 6% 4 6% 8% 28%	8234
	11th to 20th	Night	9% 13% 6% 14% 10% 7% 7% 5% 6% 5% 18%	8235
	21st to end	Night	8% 8% 4 11% 7% 6% 8% 5% 7% 8% 29%	9057
February	1st to 10th	Night	10% 12% 3 11% 8% 6% 5% 3 7% 7% 28%	2814
	11th to 20th	Night	9% 11% 4 10% 7% 6% 5% 5% 6% 7% 29%	2486
	21st to end	Night	13% 11% 4 8% 5% 4 5% 4 5% 5% 34%	2076
March	1st to 10th	Night	19% 15% 5% 10% 5% 5% 5% 3 5% 5% 25%	5484
	11th to 20th	Night	13% 11% 5% 10% 5% 6% 5% 5% 7% 8% 25%	5192
	21st to end	Night	19% 14% 3 7% 5% 4 5% 4 5% 7% 27%	5412
April	1st to 10th	Night	18% 13% 3 8% 5% 5% 4 4 6% 5% 30%	2100
	11th to 20th	Night	18% 9% 3 6% 4 4 5% 4 6% 6% 33%	1946
	21st to end	Night	20% 10% 3 7% 5% 4 4 4 5% 6% 31%	1890
May	1st to 10th	Night	24% 12% 3 8% 4 4 4 4 5% 6% 26%	5259
	11th to 20th	Night	18% 11% 3 7% 4 4 5% 4 6% 7% 31%	4979
	21st to end	Night	18% 9% 3 6% 4 4 4 4 7% 7% 35%	5114
June	1st to 10th	Night	21% 8% 2 9% 4 4 4 4 5% 7% 31%	1486
	11th to 20th	Night	17% 9% 2 6% 5% 4 4 4 5% 8% 36%	1435
	21st to end	Night	19% 9% 3 6% 5% 4 5% 4 6% 6% 33%	1423
July	1st to 10th	Night	11% 8% 3 7% 5% 5% 5% 5% 7% 9% 35%	3600
	11th to 20th	Night	13% 7% 3 7% 4 5% 5% 4 6% 8% 38%	3600
	21st to end	Night	10% 5% 2 6% 5% 5% 5% 4 7% 10% 41%	3926
August	1st to 10th	Night	18% 8% 3 7% 4 5% 6% 4 5% 7% 34%	2776
	11th to 20th	Night	14% 9% 3 8% 5% 5% 5% 4 6% 8% 33%	2872
	21st to end	Night	11% 7% 2 7% 4 4 5% 4 6% 8% 44%	3371
September	1st to 10th	Night	11% 5% 2 5% 4 3 4 3 5% 7% 50%	2036
	11th to 20th	Night	13% 6% 2 5% 3 3 4 4 5% 7% 49%	2200
	21st to end	Night	15% 8% 2 6% 4 4 4 4 4 8% 41%	2200
October	1st to 10th	Night	15% 9% 3 7% 4 4 4 4 6% 7% 38%	2201
	11th to 20th	Night	16% 10% 3 7% 4 4 5% 4 5% 6% 35%	2505
	21st to end	Night	21% 9% 3 7% 5% 5% 5% 4 5% 8% 29%	2860
November	1st to 10th	Night	16% 10% 3 9% 5% 5% 6% 4 5% 6% 32%	2667
	11th to 20th	Night	13% 10% 4 9% 7% 5% 5% 4 6% 6% 31%	2730
	21st to end	Night	15% 10% 4 9% 6% 5% 5% 4 7% 6% 28%	2916
December	1st to 10th	Night	12% 13% 5% 12% 7% 7% 6% 5% 6% 7% 19%	5060
	11th to 20th	Night	18% 12% 4 7% 5% 4 5% 4 6% 7% 27%	5741
	21st to end	Night	17% 11% 4 9% 6% 5% 4 3 5% 6% 29%	7406

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	54% 4 11% 20% 9% 1	4662
	11th to 20th	Day	57% 5% 8% 18% 10% 2	4680
	21st to end	Day	46% 5% 11% 17% 17% 4	5124
February	1st to 10th	Day	55% 3 10% 18% 12% 2	1804
	11th to 20th	Day	55% 5% 12% 16% 11% 2	2026
	21st to end	Day	54% 5% 11% 16% 11% 4	1730
March	1st to 10th	Day	59% 6% 7% 10% 13% 5%	4579
	11th to 20th	Day	54% 6% 13% 16% 9% 2	4986
	21st to end	Day	56% 3 6% 17% 15% 3	5760
April	1st to 10th	Day	56% 4 8% 15% 12% 4	2520
	11th to 20th	Day	51% 5% 9% 20% 14% 1	2622
	21st to end	Day	55% 5% 7% 19% 11% 3	2730
May	1st to 10th	Day	61% 7% 9% 14% 8% 1	7651
	11th to 20th	Day	54% 8% 13% 17% 6% 2	7941
	21st to end	Day	52% 6% 9% 21% 11% 1	9061
June	1st to 10th	Day	54% 6% 12% 20% 7%	3129
	11th to 20th	Day	47% 7% 12% 21% 12% 1	3075
	21st to end	Day	54% 7% 11% 19% 8% 1	2971
July	1st to 10th	Day	46% 9% 18% 18% 9%	6290
	11th to 20th	Day	42% 8% 13% 28% 8%	6285
	21st to end	Day	41% 6% 12% 30% 10%	6728
August	1st to 10th	Day	48% 8% 15% 23% 6%	4325
	11th to 20th	Day	50% 8% 14% 21% 6%	4214
	21st to end	Day	41% 8% 14% 22% 14% 1	4524
September	1st to 10th	Day	37% 7% 14% 28% 13% 1	2363
	11th to 20th	Day	37% 4 11% 30% 16% 2	2200
	21st to end	Day	42% 6% 12% 25% 14% 1	2200
October	1st to 10th	Day	48% 8% 12% 21% 11%	3575
	11th to 20th	Day	45% 7% 11% 26% 11%	3056
	21st to end	Day	43% 5% 16% 20% 15% 1	3180
November	1st to 10th	Day	50% 5% 12% 19% 12% 1	1851
	11th to 20th	Day	51% 6% 10% 18% 11% 3	1890
	21st to end	Day	53% 5% 16% 18% 7% 1	1696
December	1st to 10th	Day	58% 6% 12% 14% 9% 1	2350
	11th to 20th	Day	49% 6% 10% 15% 17% 3	2688
	21st to end	Day	54% 7% 9% 15% 10% 5%	3797
January	1st to 10th	Night	52% 5% 11% 20% 11% 1	8234
	11th to 20th	Night	62% 6% 10% 13% 6% 2	8280
	21st to end	Night	49% 6% 9% 19% 16% 2	9057
February	1st to 10th	Night	53% 5% 10% 18% 12% 2	2814
	11th to 20th	Night	51% 5% 11% 20% 12% 2	2488
	21st to end	Night	50% 5% 8% 21% 13% 3	2076
March	1st to 10th	Night	60% 4 8% 13% 12% 3	5494
	11th to 20th	Night	53% 9% 14% 16% 8% 1	5193
	21st to end	Night	54% 4 7% 18% 16% 1	5412
April	1st to 10th	Night	53% 4 10% 16% 15% 2	2100
	11th to 20th	Night	49% 6% 9% 20% 14% 1	1946
	21st to end	Night	52% 5% 10% 18% 13% 2	1890
May	1st to 10th	Night	57% 7% 11% 14% 11%	5265
	11th to 20th	Night	51% 7% 12% 22% 7%	4980
	21st to end	Night	45% 7% 13% 22% 13%	5115
June	1st to 10th	Night	51% 7% 11% 21% 10%	1486
	11th to 20th	Night	45% 7% 13% 21% 12% 2	1435
	21st to end	Night	50% 7% 13% 21% 9%	1423
July	1st to 10th	Night	43% 7% 18% 24% 8%	3560
	11th to 20th	Night	43% 7% 12% 30% 8%	3552
	21st to end	Night	36% 8% 17% 30% 8%	3809
August	1st to 10th	Night	50% 7% 13% 24% 5%	2766
	11th to 20th	Night	46% 10% 17% 17% 9% 1	2899
	21st to end	Night	37% 7% 16% 23% 15% 1	3371
September	1st to 10th	Night	33% 6% 14% 33% 13%	2036
	11th to 20th	Night	35% 5% 12% 31% 16% 1	2200
	21st to end	Night	41% 5% 13% 28% 12% 1	2200
October	1st to 10th	Night	46% 7% 12% 23% 12%	3604
	11th to 20th	Night	41% 7% 14% 27% 12% 1	4080
	21st to end	Night	42% 7% 17% 22% 9% 2	4610
November	1st to 10th	Night	50% 6% 12% 20% 11% 1	2667
	11th to 20th	Night	50% 6% 11% 19% 12% 2	2730
	21st to end	Night	52% 5% 13% 20% 8% 1	2916
December	1st to 10th	Night	57% 7% 12% 18% 5% 1	5060
	11th to 20th	Night	51% 6% 9% 16% 16% 1	5742
	21st to end	Night	52% 5% 12% 17% 13% 2	7406

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	33% 26% 30% 9% 2	220
	11th to 20th	Day	36% 22% 30% 10% 2	220
	21st to end	Day	24% 26% 35% 12% 3	242
February	1st to 10th	Day	32% 23% 28% 14% 2	344
	11th to 20th	Day	30% 29% 29% 10% 1	520
	21st to end	Day	33% 27% 25% 13% 2	446
March	1st to 10th	Day	32% 26% 30% 11% 1	540
	11th to 20th	Day	31% 29% 25% 12% 3 1	540
	21st to end	Day	36% 24% 25% 10% 5% 2	594
April	1st to 10th	Day	39% 22% 24% 9% 4 1	540
	11th to 20th	Day	36% 27% 20% 11% 4 2	532
	21st to end	Day	36% 21% 29% 8% 4 2	540
May	1st to 10th	Day	38% 21% 28% 9% 3 1	543
	11th to 20th	Day	28% 21% 31% 14% 5% 1	567
	21st to end	Day	24% 23% 34% 15% 4	617
June	1st to 10th	Day	27% 18% 30% 18% 6% 1	759
	11th to 20th	Day	23% 18% 28% 19% 11% 1	755
	21st to end	Day	26% 15% 29% 21% 8% 1	701
July	1st to 10th	Day	19% 19% 34% 19% 8% 1	525
	11th to 20th	Day	16% 17% 37% 20% 8% 2	524
	21st to end	Day	17% 13% 41% 22% 5% 2	576
August	1st to 10th	Day	15% 11% 35% 26% 11% 2	526
	11th to 20th	Day	18% 15% 27% 22% 14% 4	519
	21st to end	Day	17% 17% 30% 22% 11% 3	583
September	1st to 10th	Day	15% 16% 29% 23% 12% 4	530
	11th to 20th	Day	18% 15% 26% 18% 14% 8%	530
	21st to end	Day	19% 16% 28% 22% 10% 5%	530
October	1st to 10th	Day	23% 19% 25% 19% 11% 3	528
	11th to 20th	Day	30% 19% 25% 17% 7% 2	420
	21st to end	Day	33% 25% 20% 18% 4	462
November	1st to 10th	Day	33% 20% 23% 17% 6% 1	425
	11th to 20th	Day	31% 23% 25% 13% 7% 1	430
	21st to end	Day	34% 24% 24% 14% 3 1	388
December	1st to 10th	Day	27% 29% 29% 12% 3	220
	11th to 20th	Day	40% 25% 25% 7% 3	220
	21st to end	Day	36% 24% 26% 12% 2	242
January	1st to 10th	Night	26% 23% 28% 19% 3	840
	11th to 20th	Night	28% 20% 29% 19% 4	840
	21st to end	Night	20% 24% 35% 17% 3	924
February	1st to 10th	Night	24% 22% 31% 19% 4	840
	11th to 20th	Night	25% 26% 28% 18% 2	823
	21st to end	Night	25% 23% 34% 16% 2	692
March	1st to 10th	Night	28% 21% 32% 18% 1	840
	11th to 20th	Night	28% 24% 23% 20% 5%	840
	21st to end	Night	26% 23% 24% 20% 6%	924
April	1st to 10th	Night	32% 21% 27% 16% 4	840
	11th to 20th	Night	28% 19% 26% 22% 5%	702
	21st to end	Night	30% 20% 25% 18% 7%	630
May	1st to 10th	Night	27% 17% 27% 23% 6%	630
	11th to 20th	Night	24% 16% 31% 20% 8%	535
	21st to end	Night	21% 13% 29% 28% 9%	455
June	1st to 10th	Night	26% 11% 27% 27% 8%	420
	11th to 20th	Night	22% 12% 23% 29% 14%	410
	21st to end	Night	23% 12% 25% 32% 8%	400
July	1st to 10th	Night	20% 8% 26% 34% 11% 1	390
	11th to 20th	Night	18% 9% 23% 34% 16% 1	388
	21st to end	Night	15% 6% 23% 40% 15%	438
August	1st to 10th	Night	17% 6% 24% 35% 16% 1	510
	11th to 20th	Night	17% 6% 27% 32% 17% 1	592
	21st to end	Night	16% 10% 24% 32% 16% 2	743
September	1st to 10th	Night	15% 10% 26% 32% 15% 1	800
	11th to 20th	Night	17% 12% 21% 29% 19% 3	800
	21st to end	Night	19% 14% 25% 28% 14% 1	800
October	1st to 10th	Night	21% 15% 22% 28% 13% 1	800
	11th to 20th	Night	27% 18% 23% 22% 9% 2	800
	21st to end	Night	33% 16% 26% 21% 4	880
November	1st to 10th	Night	28% 18% 24% 23% 6% 1	820
	11th to 20th	Night	28% 19% 25% 19% 8% 1	840
	21st to end	Night	29% 21% 23% 20% 6% 1	917
December	1st to 10th	Night	28% 20% 31% 16% 5%	950
	11th to 20th	Night	31% 24% 25% 16% 4	950
	21st to end	Night	32% 22% 28% 16% 3	982

Page generated at 2026-06-13 02:31:38. Version ac07

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