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 2025-02-21.

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% 31%	107916
	Night	15% 10% 4 9% 6% 5% 5% 4 6% 7% 31%	110684
Transparency	Day	50% 6% 12% 20% 11% 2	111445
	Night	50% 6% 12% 20% 11% 1	115320
Seeing	Day	27% 20% 29% 16% 7% 2	15629
	Night	25% 18% 26% 23% 8% 1	24341

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	11% 11% 6% 12% 7% 6% 6% 4 6% 6% 25%	3597
	11th to 20th	Day	9% 11% 4 13% 7% 6% 6% 3 5% 6% 28%	3570
	21st to end	Day	8% 9% 4 12% 7% 6% 6% 4 6% 5% 33%	3960
February	1st to 10th	Day	12% 13% 4 8% 7% 6% 7% 4 6% 6% 27%	1718
	11th to 20th	Day	9% 12% 4 12% 8% 7% 5% 4 6% 6% 27%	1918
	21st to end	Day	12% 14% 4 9% 5% 6% 6% 5% 6% 6% 28%	1570
March	1st to 10th	Day	18% 17% 4 9% 5% 4 4 3 4 5% 27%	3116
	11th to 20th	Day	14% 14% 5% 12% 7% 5% 4 3 4 6% 28%	3406
	21st to end	Day	17% 14% 4 8% 5% 4 4 2 4 6% 31%	3930
April	1st to 10th	Day	17% 14% 4 9% 5% 4 4 3 5% 6% 29%	2280
	11th to 20th	Day	15% 12% 3 8% 5% 4 4 4 5% 7% 34%	2370
	21st to end	Day	20% 13% 3 9% 5% 4 4 3 4 6% 29%	2470
May	1st to 10th	Day	20% 11% 4 8% 6% 5% 5% 4 5% 6% 26%	4106
	11th to 20th	Day	19% 10% 3 9% 6% 7% 6% 5% 5% 6% 25%	4253
	21st to end	Day	12% 7% 3 7% 6% 6% 7% 5% 8% 9% 31%	4837
June	1st to 10th	Day	24% 9% 3 7% 5% 4 5% 4 6% 7% 27%	2831
	11th to 20th	Day	17% 7% 3 7% 5% 5% 5% 4 6% 8% 33%	2850
	21st to end	Day	21% 8% 3 8% 6% 5% 5% 4 6% 7% 27%	2823
July	1st to 10th	Day	12% 7% 2 7% 5% 5% 6% 5% 9% 9% 33%	4440
	11th to 20th	Day	12% 6% 2 7% 5% 5% 6% 5% 7% 10% 36%	4440
	21st to end	Day	14% 8% 4 8% 4 5% 5% 4 6% 7% 35%	4814
August	1st to 10th	Day	15% 6% 2 8% 6% 6% 7% 5% 7% 9% 29%	4206
	11th to 20th	Day	14% 10% 4 8% 6% 6% 6% 4 6% 8% 28%	4045
	21st to end	Day	12% 7% 3 7% 5% 5% 5% 5% 7% 7% 37%	4386
September	1st to 10th	Day	11% 6% 2 7% 4 4 5% 4 6% 7% 44%	2245
	11th to 20th	Day	13% 6% 3 5% 4 3 4 4 4 6% 48%	2090
	21st to end	Day	14% 7% 3 7% 5% 4 5% 5% 6% 8% 37%	2090
October	1st to 10th	Day	17% 10% 3 7% 4 4 4 3 6% 7% 35%	2088
	11th to 20th	Day	16% 11% 3 7% 5% 5% 4 3 5% 7% 33%	1798
	21st to end	Day	20% 14% 4 9% 6% 4 4 3 5% 6% 26%	1881
November	1st to 10th	Day	15% 10% 4 9% 5% 4 5% 4 5% 6% 34%	1761
	11th to 20th	Day	16% 9% 4 9% 6% 6% 5% 4 6% 6% 29%	1800
	21st to end	Day	18% 11% 3 9% 5% 4 4 3 6% 8% 28%	1615
December	1st to 10th	Day	11% 15% 4 11% 9% 7% 5% 4 4 6% 23%	2280
	11th to 20th	Day	16% 10% 3 8% 6% 5% 5% 4 5% 5% 33%	2618
	21st to end	Day	18% 12% 4 9% 5% 4 5% 4 6% 6% 27%	3714
January	1st to 10th	Night	10% 13% 4 11% 6% 6% 5% 3 6% 8% 27%	6349
	11th to 20th	Night	9% 12% 5% 13% 10% 7% 7% 5% 6% 5% 20%	6315
	21st to end	Night	9% 9% 5% 12% 7% 5% 7% 4 6% 7% 30%	6996
February	1st to 10th	Night	11% 13% 4 11% 8% 6% 5% 4 7% 7% 26%	2680
	11th to 20th	Night	9% 11% 4 10% 7% 6% 5% 5% 6% 7% 29%	2365
	21st to end	Night	14% 12% 4 8% 6% 4 5% 5% 5% 5% 34%	1885
March	1st to 10th	Night	21% 16% 4 7% 5% 4 4 2 4 4 27%	3724
	11th to 20th	Night	12% 13% 6% 12% 6% 6% 5% 4 6% 6% 24%	3552
	21st to end	Night	22% 14% 3 7% 5% 4 4 3 5% 7% 26%	3700
April	1st to 10th	Night	18% 13% 3 7% 5% 5% 3 4 6% 5% 30%	1900
	11th to 20th	Night	17% 9% 3 6% 4 4 5% 4 6% 6% 35%	1758
	21st to end	Night	21% 10% 3 7% 5% 4 4 4 5% 6% 30%	1710
May	1st to 10th	Night	20% 11% 3 7% 4 4 5% 4 6% 7% 28%	2834
	11th to 20th	Night	17% 11% 4 9% 5% 5% 5% 5% 6% 7% 28%	2669
	21st to end	Night	15% 6% 2 6% 4 4 5% 4 8% 9% 37%	2738
June	1st to 10th	Night	22% 8% 2 8% 5% 4 4 4 5% 8% 30%	1344
	11th to 20th	Night	17% 9% 2 5% 5% 4 4 4 5% 8% 37%	1330
	21st to end	Night	20% 9% 3 7% 5% 4 5% 4 6% 6% 32%	1352
July	1st to 10th	Night	11% 8% 2 7% 5% 5% 4 5% 7% 8% 37%	2520
	11th to 20th	Night	15% 6% 2 6% 4 4 5% 3 6% 9% 39%	2520
	21st to end	Night	13% 7% 2 7% 5% 5% 5% 4 7% 8% 38%	2739
August	1st to 10th	Night	18% 8% 3 7% 5% 5% 6% 4 5% 7% 32%	2690
	11th to 20th	Night	14% 9% 3 8% 5% 5% 5% 4 6% 8% 32%	2782
	21st to end	Night	11% 7% 2 7% 4 4 5% 4 6% 8% 44%	3268
September	1st to 10th	Night	12% 5% 2 5% 4 3 4 3 5% 7% 49%	1934
	11th to 20th	Night	13% 6% 2 5% 4 3 4 3 5% 7% 48%	2090
	21st to end	Night	15% 8% 2 6% 4 4 4 4 4 8% 41%	2090
October	1st to 10th	Night	15% 9% 3 7% 5% 4 4 4 6% 7% 36%	2091
	11th to 20th	Night	17% 9% 3 7% 4 4 5% 4 5% 7% 35%	2380
	21st to end	Night	21% 9% 3 7% 5% 5% 5% 4 5% 8% 29%	2717
November	1st to 10th	Night	16% 9% 3 9% 5% 5% 5% 4 5% 6% 32%	2537
	11th to 20th	Night	14% 10% 4 9% 7% 5% 5% 4 6% 6% 32%	2600
	21st to end	Night	16% 11% 4 9% 6% 5% 5% 4 6% 6% 29%	2777
December	1st to 10th	Night	13% 13% 5% 12% 7% 7% 6% 5% 6% 7% 19%	4910
	11th to 20th	Night	18% 12% 4 7% 5% 4 5% 4 6% 7% 27%	5591
	21st to end	Night	17% 11% 4 9% 6% 5% 4 3 5% 6% 30%	7247

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	57% 5% 9% 20% 8% 1	3598
	11th to 20th	Day	54% 5% 9% 21% 9% 2	3600
	21st to end	Day	50% 5% 9% 13% 18% 5%	3960
February	1st to 10th	Day	56% 3 10% 16% 12% 3	1718
	11th to 20th	Day	56% 4 12% 15% 10% 2	1927
	21st to end	Day	55% 4 11% 16% 10% 4	1570
March	1st to 10th	Day	59% 5% 8% 12% 13% 3	3119
	11th to 20th	Day	57% 4 9% 18% 9% 3	3406
	21st to end	Day	55% 2 6% 17% 16% 4	3930
April	1st to 10th	Day	57% 4 8% 15% 11% 4	2280
	11th to 20th	Day	50% 5% 9% 21% 14% 1	2370
	21st to end	Day	56% 5% 7% 18% 10% 4	2470
May	1st to 10th	Day	56% 8% 10% 16% 9% 1	4120
	11th to 20th	Day	57% 8% 12% 16% 7% 1	4257
	21st to end	Day	46% 8% 12% 20% 14% 1	4837
June	1st to 10th	Day	55% 6% 13% 20% 6%	2831
	11th to 20th	Day	48% 7% 11% 21% 12% 2	2850
	21st to end	Day	55% 7% 11% 18% 8% 1	2823
July	1st to 10th	Day	42% 9% 18% 21% 11%	4370
	11th to 20th	Day	41% 8% 15% 30% 5%	4365
	21st to end	Day	46% 7% 11% 27% 8% 1	4661
August	1st to 10th	Day	49% 8% 15% 22% 6%	4192
	11th to 20th	Day	51% 8% 14% 20% 6%	4084
	21st to end	Day	41% 8% 13% 22% 14% 1	4386
September	1st to 10th	Day	37% 7% 14% 28% 13% 1	2245
	11th to 20th	Day	38% 4 11% 30% 16% 2	2090
	21st to end	Day	43% 6% 13% 24% 13% 1	2090
October	1st to 10th	Day	49% 8% 13% 19% 10%	3465
	11th to 20th	Day	44% 7% 11% 26% 11%	2962
	21st to end	Day	43% 5% 16% 20% 15% 1	3081
November	1st to 10th	Day	50% 5% 13% 19% 12% 1	1761
	11th to 20th	Day	51% 6% 10% 18% 12% 3	1800
	21st to end	Day	52% 5% 16% 19% 7% 1	1615
December	1st to 10th	Day	59% 6% 12% 14% 9% 1	2280
	11th to 20th	Day	49% 6% 11% 14% 17% 4	2618
	21st to end	Day	54% 7% 9% 15% 10% 5%	3714
January	1st to 10th	Night	54% 5% 11% 20% 10% 1	6349
	11th to 20th	Night	61% 7% 11% 15% 4 2	6360
	21st to end	Night	51% 6% 7% 18% 16% 2	6996
February	1st to 10th	Night	54% 5% 10% 17% 11% 2	2680
	11th to 20th	Night	52% 5% 11% 19% 11% 2	2367
	21st to end	Night	51% 5% 9% 20% 13% 3	1885
March	1st to 10th	Night	60% 4 9% 16% 8% 3	3734
	11th to 20th	Night	56% 7% 12% 15% 8% 2	3553
	21st to end	Night	57% 3 6% 19% 14% 2	3700
April	1st to 10th	Night	53% 4 10% 15% 15% 2	1900
	11th to 20th	Night	47% 6% 10% 21% 15% 1	1758
	21st to end	Night	53% 5% 10% 16% 12% 3	1710
May	1st to 10th	Night	51% 10% 14% 17% 8% 1	2840
	11th to 20th	Night	53% 8% 13% 17% 8% 1	2670
	21st to end	Night	40% 9% 16% 22% 12% 1	2739
June	1st to 10th	Night	52% 7% 11% 20% 9%	1344
	11th to 20th	Night	44% 7% 13% 22% 13% 2	1330
	21st to end	Night	50% 7% 13% 21% 8%	1352
July	1st to 10th	Night	41% 7% 17% 24% 10%	2480
	11th to 20th	Night	41% 7% 14% 31% 8%	2472
	21st to end	Night	41% 10% 13% 27% 9%	2651
August	1st to 10th	Night	52% 8% 13% 23% 5%	2680
	11th to 20th	Night	47% 10% 17% 16% 9%	2809
	21st to end	Night	37% 7% 16% 23% 15% 1	3268
September	1st to 10th	Night	33% 7% 14% 32% 13%	1934
	11th to 20th	Night	36% 5% 12% 30% 16% 1	2090
	21st to end	Night	42% 5% 12% 28% 12% 1	2090
October	1st to 10th	Night	47% 7% 12% 22% 12%	3494
	11th to 20th	Night	40% 7% 14% 27% 12% 1	3955
	21st to end	Night	42% 7% 18% 22% 10% 2	4467
November	1st to 10th	Night	50% 6% 13% 20% 11% 1	2537
	11th to 20th	Night	50% 6% 11% 19% 13% 2	2600
	21st to end	Night	52% 5% 13% 20% 9% 1	2777
December	1st to 10th	Night	58% 6% 12% 18% 5% 1	4910
	11th to 20th	Night	52% 6% 9% 16% 16% 1	5592
	21st to end	Night	52% 5% 12% 17% 13% 2	7247

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	32% 27% 31% 9% 2	200
	11th to 20th	Day	36% 21% 30% 11% 3 1	200
	21st to end	Day	24% 25% 35% 13% 3	220
February	1st to 10th	Day	33% 23% 29% 12% 2	318
	11th to 20th	Day	31% 30% 27% 10% 1	481
	21st to end	Day	34% 27% 23% 15% 2	382
March	1st to 10th	Day	32% 23% 32% 12% 2	460
	11th to 20th	Day	28% 29% 26% 12% 3 1	460
	21st to end	Day	34% 24% 25% 11% 5% 2	506
April	1st to 10th	Day	38% 23% 24% 10% 5% 1	460
	11th to 20th	Day	34% 26% 21% 12% 5% 2	452
	21st to end	Day	36% 21% 29% 9% 3 2	460
May	1st to 10th	Day	35% 20% 31% 10% 3 1	463
	11th to 20th	Day	26% 20% 33% 14% 6% 1	487
	21st to end	Day	22% 22% 35% 16% 5% 1	529
June	1st to 10th	Day	28% 19% 30% 17% 6% 1	661
	11th to 20th	Day	23% 16% 28% 20% 11% 1	680
	21st to end	Day	27% 14% 28% 21% 8% 2	653
July	1st to 10th	Day	18% 18% 34% 20% 8% 1	485
	11th to 20th	Day	15% 17% 36% 20% 9% 2	484
	21st to end	Day	17% 12% 40% 23% 5% 2	532
August	1st to 10th	Day	16% 12% 35% 24% 11% 2	486
	11th to 20th	Day	19% 15% 28% 21% 13% 4	479
	21st to end	Day	17% 17% 28% 23% 11% 4	539
September	1st to 10th	Day	16% 17% 28% 23% 12% 4	490
	11th to 20th	Day	19% 14% 27% 18% 13% 8%	490
	21st to end	Day	18% 16% 27% 22% 10% 6%	490
October	1st to 10th	Day	23% 19% 26% 18% 11% 3	488
	11th to 20th	Day	29% 20% 25% 16% 8% 3	390
	21st to end	Day	34% 24% 20% 18% 4	429
November	1st to 10th	Day	32% 19% 23% 18% 7% 1	395
	11th to 20th	Day	32% 22% 25% 13% 7% 1	400
	21st to end	Day	34% 23% 24% 14% 4 1	360
December	1st to 10th	Day	27% 30% 27% 13% 4	200
	11th to 20th	Day	41% 24% 25% 8% 3	200
	21st to end	Day	34% 24% 27% 12% 3	220
January	1st to 10th	Night	26% 24% 28% 19% 3	800
	11th to 20th	Night	29% 20% 29% 19% 4	800
	21st to end	Night	20% 24% 35% 17% 4	880
February	1st to 10th	Night	25% 22% 30% 20% 3	800
	11th to 20th	Night	26% 26% 28% 18% 2	783
	21st to end	Night	26% 23% 33% 17% 2	629
March	1st to 10th	Night	28% 20% 31% 19% 1	760
	11th to 20th	Night	26% 25% 24% 21% 5%	760
	21st to end	Night	26% 23% 23% 20% 7%	836
April	1st to 10th	Night	31% 20% 27% 17% 4	760
	11th to 20th	Night	26% 18% 27% 23% 5%	634
	21st to end	Night	30% 19% 25% 19% 7%	570
May	1st to 10th	Night	26% 16% 28% 24% 6% 1	570
	11th to 20th	Night	24% 16% 30% 22% 9%	483
	21st to end	Night	20% 12% 30% 29% 9%	411
June	1st to 10th	Night	28% 11% 26% 26% 9% 1	380
	11th to 20th	Night	22% 11% 23% 29% 15%	380
	21st to end	Night	24% 11% 24% 32% 9%	380
July	1st to 10th	Night	20% 8% 25% 35% 11% 1	370
	11th to 20th	Night	18% 7% 23% 35% 16% 1	368
	21st to end	Night	16% 6% 23% 39% 16%	416
August	1st to 10th	Night	18% 7% 24% 35% 17% 1	484
	11th to 20th	Night	17% 6% 27% 32% 16% 1	562
	21st to end	Night	16% 10% 24% 32% 16% 2	706
September	1st to 10th	Night	15% 10% 27% 32% 15% 1	760
	11th to 20th	Night	18% 12% 22% 28% 18% 3	760
	21st to end	Night	20% 13% 24% 27% 14% 1	760
October	1st to 10th	Night	22% 14% 22% 28% 13% 1	760
	11th to 20th	Night	26% 18% 23% 22% 9% 2	760
	21st to end	Night	33% 17% 26% 19% 4	836
November	1st to 10th	Night	26% 18% 25% 23% 6% 1	780
	11th to 20th	Night	27% 19% 26% 19% 8% 1	800
	21st to end	Night	30% 21% 23% 20% 5% 1	870
December	1st to 10th	Night	28% 20% 30% 16% 5%	900
	11th to 20th	Night	31% 23% 24% 16% 5%	900
	21st to end	Night	31% 21% 28% 16% 3	933

Page generated at 2025-02-18 03:26:26. Version ac07

Copyright © 2025 Attilla Danko.