OAOG Moose Creek
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the OAOG Moose Creek clear sky chart from 2005-11-06 to 2024-04-10.

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% 4 7% 6% 3 5% 5% 5% 7% 32%	82962
	Night	18% 11% 4 8% 6% 3 4 4 5% 6% 31%	85817
Transparency	Day	51% 6% 12% 19% 10% 1	82667
	Night	54% 6% 11% 18% 9% 1	85646
Seeing	Day	21% 12% 28% 24% 12% 4	13711
	Night	22% 9% 29% 29% 10% 1	22938

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% 16% 6% 11% 7% 3 4 4 5% 4 23%	2517
	11th to 20th	Day	14% 13% 7% 10% 8% 5% 6% 5% 5% 6% 22%	2520
	21st to end	Day	14% 18% 6% 9% 8% 4 6% 5% 5% 6% 18%	2835
February	1st to 10th	Day	15% 15% 4 10% 7% 3 4 5% 5% 6% 25%	1710
	11th to 20th	Day	14% 12% 5% 11% 7% 3 5% 5% 4 5% 28%	1705
	21st to end	Day	19% 13% 5% 8% 5% 3 6% 4 5% 6% 27%	1570
March	1st to 10th	Day	19% 12% 5% 9% 7% 3 5% 4 4 5% 27%	3116
	11th to 20th	Day	13% 16% 5% 8% 7% 4 5% 5% 4 6% 27%	3408
	21st to end	Day	15% 7% 3 6% 7% 3 4 4 5% 7% 39%	4084
April	1st to 10th	Day	22% 11% 3 7% 5% 3 4 3 4 6% 32%	2270
	11th to 20th	Day	21% 7% 5% 6% 6% 3 3 3 5% 6% 35%	2134
	21st to end	Day	23% 9% 5% 7% 5% 4 4 4 4 6% 30%	2270
May	1st to 10th	Day	20% 8% 3 6% 5% 3 5% 4 5% 7% 34%	2520
	11th to 20th	Day	17% 7% 3 6% 6% 3 4 4 5% 7% 39%	2478
	21st to end	Day	16% 7% 2 6% 5% 4 5% 6% 6% 7% 37%	2725
June	1st to 10th	Day	23% 8% 3 6% 6% 3 5% 5% 5% 7% 29%	2520
	11th to 20th	Day	15% 6% 2 5% 6% 3 5% 6% 6% 8% 38%	2520
	21st to end	Day	19% 7% 2 6% 5% 3 5% 5% 6% 9% 31%	2520
July	1st to 10th	Day	11% 7% 3 5% 5% 3 5% 5% 7% 8% 42%	2520
	11th to 20th	Day	12% 6% 3 5% 6% 3 6% 6% 8% 9% 37%	2520
	21st to end	Day	12% 6% 2 4 6% 3 5% 6% 7% 9% 38%	2744
August	1st to 10th	Day	12% 6% 2 6% 6% 4 6% 5% 6% 8% 39%	2506
	11th to 20th	Day	11% 5% 2 6% 6% 3 5% 6% 6% 9% 40%	2248
	21st to end	Day	13% 6% 2 5% 5% 3 5% 5% 6% 9% 41%	2376
September	1st to 10th	Day	13% 6% 3 5% 5% 3 5% 5% 6% 8% 42%	2160
	11th to 20th	Day	14% 5% 2 4 4 3 4 4 5% 7% 48%	2134
	21st to end	Day	17% 7% 2 6% 4 3 4 4 6% 7% 40%	1965
October	1st to 10th	Day	20% 7% 3 6% 5% 3 5% 5% 5% 6% 36%	1800
	11th to 20th	Day	20% 10% 3 7% 7% 3 6% 5% 5% 6% 28%	1800
	21st to end	Day	26% 10% 3 6% 6% 4 4 5% 4 5% 27%	1805
November	1st to 10th	Day	17% 8% 5% 6% 5% 4 5% 5% 6% 7% 32%	1671
	11th to 20th	Day	17% 12% 4 7% 6% 3 5% 4 5% 7% 28%	1573
	21st to end	Day	20% 13% 4 9% 7% 4 6% 4 5% 7% 21%	1520
December	1st to 10th	Day	24% 13% 6% 9% 7% 3 5% 5% 5% 5% 17%	1520
	11th to 20th	Day	22% 14% 6% 8% 6% 3 4 4 4 6% 23%	1906
	21st to end	Day	26% 18% 5% 9% 6% 3 4 3 3 4 20%	2772
January	1st to 10th	Night	18% 16% 6% 10% 8% 3 5% 3 5% 5% 21%	4429
	11th to 20th	Night	13% 14% 6% 12% 9% 4 6% 5% 6% 6% 20%	4440
	21st to end	Night	17% 18% 8% 11% 7% 4 4 3 4 4 21%	4820
February	1st to 10th	Night	15% 13% 6% 12% 7% 4 6% 5% 5% 5% 22%	2470
	11th to 20th	Night	14% 13% 5% 11% 7% 3 4 4 5% 5% 28%	2361
	21st to end	Night	15% 14% 6% 8% 6% 4 5% 3 4 5% 29%	1884
March	1st to 10th	Night	20% 11% 5% 7% 6% 3 4 4 4 4 32%	3724
	11th to 20th	Night	18% 15% 5% 9% 7% 3 4 3 4 6% 26%	3548
	21st to end	Night	15% 12% 3 6% 5% 3 4 3 4 6% 39%	3547
April	1st to 10th	Night	22% 10% 4 6% 6% 3 4 4 5% 5% 32%	1900
	11th to 20th	Night	20% 8% 3 6% 5% 3 4 4 5% 5% 36%	1775
	21st to end	Night	22% 9% 3 7% 5% 3 4 4 5% 6% 33%	1705
May	1st to 10th	Night	21% 7% 3 5% 6% 3 5% 4 5% 6% 35%	1440
	11th to 20th	Night	18% 7% 3 6% 4 3 4 4 5% 5% 40%	1415
	21st to end	Night	13% 6% 3 4 6% 4 5% 6% 6% 6% 43%	1550
June	1st to 10th	Night	18% 6% 3 5% 7% 4 6% 6% 6% 9% 30%	1440
	11th to 20th	Night	15% 6% 3 6% 5% 3 4 5% 5% 8% 40%	1440
	21st to end	Night	17% 7% 3 6% 4 3 5% 5% 7% 8% 35%	1440
July	1st to 10th	Night	9% 5% 2 5% 6% 3 5% 6% 8% 8% 44%	1440
	11th to 20th	Night	11% 5% 3 5% 5% 3 4 6% 7% 9% 42%	1440
	21st to end	Night	9% 6% 3 5% 6% 3 5% 6% 7% 10% 40%	1574
August	1st to 10th	Night	11% 6% 2 6% 6% 2 5% 5% 6% 9% 43%	1432
	11th to 20th	Night	12% 5% 2 6% 5% 4 4 4 6% 8% 43%	1630
	21st to end	Night	12% 7% 2 5% 5% 3 4 5% 5% 8% 43%	1980
September	1st to 10th	Night	12% 5% 2 6% 7% 3 5% 6% 5% 7% 43%	1800
	11th to 20th	Night	15% 5% 2 5% 4 2 3 3 5% 7% 48%	1826
	21st to end	Night	16% 5% 2 6% 6% 3 4 5% 5% 7% 42%	1993
October	1st to 10th	Night	20% 8% 2 5% 6% 2 5% 4 5% 7% 36%	2160
	11th to 20th	Night	20% 8% 3 6% 6% 4 5% 4 5% 6% 32%	2160
	21st to end	Night	23% 9% 4 7% 6% 4 5% 5% 4 5% 28%	2551
November	1st to 10th	Night	20% 10% 4 7% 5% 3 4 3 4 7% 34%	2407
	11th to 20th	Night	18% 10% 3 7% 7% 3 5% 5% 5% 5% 31%	2604
	21st to end	Night	22% 11% 6% 9% 6% 3 4 4 4 6% 24%	2660
December	1st to 10th	Night	21% 14% 7% 9% 8% 4 5% 5% 5% 6% 18%	2660
	11th to 20th	Night	23% 14% 5% 7% 6% 3 5% 4 4 4 25%	3288
	21st to end	Night	30% 16% 5% 10% 5% 2 3 3 4 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	64% 6% 14% 10% 5% 1	2518
	11th to 20th	Day	62% 6% 12% 12% 6%	2520
	21st to end	Day	66% 8% 13% 9% 4	2835
February	1st to 10th	Day	60% 6% 9% 20% 3 2	1710
	11th to 20th	Day	58% 4 13% 17% 7% 1	1714
	21st to end	Day	60% 4 12% 14% 9% 2	1570
March	1st to 10th	Day	59% 5% 10% 18% 8% 1	3119
	11th to 20th	Day	58% 4 14% 13% 9% 2	3408
	21st to end	Day	45% 4 9% 22% 17% 2	4084
April	1st to 10th	Day	54% 3 8% 19% 12% 3	2270
	11th to 20th	Day	50% 4 8% 20% 16% 2	2134
	21st to end	Day	55% 5% 9% 14% 13% 4	2270
May	1st to 10th	Day	50% 4 8% 20% 14% 4	2520
	11th to 20th	Day	45% 6% 10% 21% 16% 2	2482
	21st to end	Day	45% 7% 12% 20% 13% 2	2725
June	1st to 10th	Day	53% 6% 11% 17% 11% 1	2520
	11th to 20th	Day	43% 7% 12% 24% 12% 2	2520
	21st to end	Day	49% 7% 14% 19% 10% 1	2520
July	1st to 10th	Day	38% 7% 12% 28% 14% 1	2450
	11th to 20th	Day	39% 8% 15% 28% 10%	2445
	21st to end	Day	40% 8% 17% 25% 10%	2591
August	1st to 10th	Day	41% 9% 16% 25% 9%	2492
	11th to 20th	Day	38% 9% 18% 25% 9% 1	2248
	21st to end	Day	40% 7% 14% 26% 12% 1	2376
September	1st to 10th	Day	39% 7% 15% 27% 13%	2160
	11th to 20th	Day	37% 6% 12% 31% 13% 1	2134
	21st to end	Day	43% 7% 14% 28% 9%	1965
October	1st to 10th	Day	49% 6% 11% 22% 11% 1	1800
	11th to 20th	Day	56% 7% 14% 16% 7% 1	1800
	21st to end	Day	60% 6% 10% 16% 7% 1	1805
November	1st to 10th	Day	51% 6% 14% 20% 7% 1	1671
	11th to 20th	Day	55% 6% 12% 16% 10% 1	1573
	21st to end	Day	62% 7% 13% 12% 5%	1520
December	1st to 10th	Day	68% 7% 12% 9% 3	1520
	11th to 20th	Day	64% 6% 13% 13% 4	1906
	21st to end	Day	71% 4 7% 14% 3	2772
January	1st to 10th	Night	66% 6% 15% 10% 4	4429
	11th to 20th	Night	64% 8% 14% 9% 4	4440
	21st to end	Night	67% 5% 11% 10% 5% 1	4820
February	1st to 10th	Night	63% 5% 10% 15% 6% 1	2470
	11th to 20th	Night	58% 4 11% 19% 8%	2363
	21st to end	Night	58% 4 8% 18% 11% 1	1884
March	1st to 10th	Night	55% 5% 8% 20% 10% 2	3734
	11th to 20th	Night	60% 5% 12% 14% 8% 2	3549
	21st to end	Night	47% 3 7% 23% 17% 3	3547
April	1st to 10th	Night	55% 4 9% 17% 13% 2	1900
	11th to 20th	Night	50% 5% 8% 19% 16% 2	1775
	21st to end	Night	51% 5% 8% 17% 15% 4	1705
May	1st to 10th	Night	50% 6% 7% 17% 15% 5%	1440
	11th to 20th	Night	45% 4 8% 19% 20% 3	1416
	21st to end	Night	38% 9% 14% 20% 17% 3	1551
June	1st to 10th	Night	48% 8% 13% 19% 11% 1	1440
	11th to 20th	Night	42% 5% 13% 21% 17% 2	1440
	21st to end	Night	44% 8% 15% 20% 12%	1440
July	1st to 10th	Night	34% 10% 12% 26% 17% 1	1400
	11th to 20th	Night	35% 8% 14% 31% 12%	1392
	21st to end	Night	36% 11% 15% 25% 13%	1486
August	1st to 10th	Night	37% 9% 19% 24% 11% 1	1422
	11th to 20th	Night	39% 7% 15% 26% 12% 1	1630
	21st to end	Night	38% 7% 15% 28% 11% 1	1980
September	1st to 10th	Night	41% 7% 10% 26% 15% 1	1800
	11th to 20th	Night	35% 6% 13% 34% 11% 1	1826
	21st to end	Night	42% 6% 12% 28% 11% 1	1993
October	1st to 10th	Night	48% 7% 10% 23% 12% 1	2160
	11th to 20th	Night	52% 6% 12% 21% 8%	2160
	21st to end	Night	58% 6% 13% 15% 8% 1	2551
November	1st to 10th	Night	52% 5% 13% 21% 8% 1	2407
	11th to 20th	Night	54% 6% 12% 18% 9% 1	2604
	21st to end	Night	62% 6% 12% 15% 5%	2660
December	1st to 10th	Night	68% 6% 10% 13% 3	2660
	11th to 20th	Night	64% 4 10% 15% 6% 1	3288
	21st to end	Night	71% 5% 8% 13% 4	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	27% 14% 26% 24% 8%	180
	11th to 20th	Day	23% 18% 34% 18% 6% 1	180
	21st to end	Day	18% 14% 33% 26% 8%	216
February	1st to 10th	Day	29% 19% 36% 13% 4	270
	11th to 20th	Day	22% 18% 36% 21% 2	312
	21st to end	Day	28% 13% 34% 24% 2	382
March	1st to 10th	Day	23% 13% 32% 25% 6%	460
	11th to 20th	Day	20% 18% 35% 22% 4 1	460
	21st to end	Day	27% 12% 33% 18% 9% 2	506
April	1st to 10th	Day	26% 15% 29% 21% 9% 1	457
	11th to 20th	Day	27% 17% 24% 18% 12% 3	412
	21st to end	Day	28% 13% 29% 19% 10% 2	420
May	1st to 10th	Day	25% 11% 30% 23% 9% 3	423
	11th to 20th	Day	17% 12% 33% 23% 12% 3	447
	21st to end	Day	18% 10% 32% 26% 12% 2	485
June	1st to 10th	Day	27% 10% 25% 25% 9% 4	450
	11th to 20th	Day	15% 10% 27% 30% 13% 4	450
	21st to end	Day	21% 11% 25% 25% 14% 4	450
July	1st to 10th	Day	14% 6% 22% 32% 20% 6%	445
	11th to 20th	Day	11% 8% 28% 30% 19% 4	444
	21st to end	Day	14% 6% 26% 33% 18% 3	488
August	1st to 10th	Day	15% 6% 19% 35% 20% 6%	446
	11th to 20th	Day	14% 5% 20% 30% 21% 10%	439
	21st to end	Day	15% 7% 24% 28% 16% 9%	495
September	1st to 10th	Day	14% 6% 27% 22% 18% 12%	450
	11th to 20th	Day	13% 6% 24% 23% 22% 12%	450
	21st to end	Day	18% 11% 28% 19% 18% 6%	450
October	1st to 10th	Day	24% 12% 24% 19% 15% 6%	450
	11th to 20th	Day	24% 14% 32% 20% 8% 2	450
	21st to end	Day	32% 13% 25% 23% 9%	408
November	1st to 10th	Day	24% 16% 27% 22% 9% 1	365
	11th to 20th	Day	26% 14% 33% 19% 8%	233
	21st to end	Day	27% 17% 27% 22% 6% 2	180
December	1st to 10th	Day	30% 14% 28% 21% 7%	180
	11th to 20th	Day	27% 21% 33% 17% 2 1	180
	21st to end	Day	31% 21% 30% 13% 5% 1	198
January	1st to 10th	Night	26% 13% 31% 26% 4	760
	11th to 20th	Night	28% 11% 30% 24% 6% 1	760
	21st to end	Night	20% 7% 35% 31% 6%	836
February	1st to 10th	Night	21% 10% 38% 26% 5%	760
	11th to 20th	Night	21% 12% 38% 24% 4	743
	21st to end	Night	23% 10% 35% 28% 3	628
March	1st to 10th	Night	25% 10% 31% 28% 6%	760
	11th to 20th	Night	23% 13% 34% 26% 4	760
	21st to end	Night	23% 10% 28% 30% 8%	836
April	1st to 10th	Night	28% 9% 30% 28% 5%	760
	11th to 20th	Night	22% 12% 33% 24% 8%	711
	21st to end	Night	27% 9% 29% 27% 8% 1	625
May	1st to 10th	Night	24% 8% 29% 28% 8% 3	360
	11th to 20th	Night	22% 6% 32% 29% 10% 1	354
	21st to end	Night	16% 3 36% 32% 13%	389
June	1st to 10th	Night	19% 4 28% 40% 9%	360
	11th to 20th	Night	16% 6% 28% 37% 12% 1	360
	21st to end	Night	16% 5% 26% 35% 16% 1	360
July	1st to 10th	Night	11% 5% 23% 41% 19%	350
	11th to 20th	Night	12% 2 25% 43% 18% 1	348
	21st to end	Night	12% 3 24% 46% 14% 1	394
August	1st to 10th	Night	14% 3 18% 45% 20% 1	358
	11th to 20th	Night	14% 3 17% 38% 26% 2	566
	21st to end	Night	14% 5% 23% 37% 19% 2	792
September	1st to 10th	Night	13% 7% 23% 39% 18% 1	720
	11th to 20th	Night	18% 5% 19% 34% 22% 3	720
	21st to end	Night	18% 6% 26% 26% 21% 2	720
October	1st to 10th	Night	25% 5% 26% 29% 14% 1	720
	11th to 20th	Night	25% 8% 29% 27% 11%	720
	21st to end	Night	28% 9% 28% 28% 6%	792
November	1st to 10th	Night	26% 10% 26% 28% 9% 1	740
	11th to 20th	Night	24% 12% 33% 22% 9% 1	760
	21st to end	Night	26% 11% 31% 24% 8%	760
December	1st to 10th	Night	29% 10% 33% 22% 5%	760
	11th to 20th	Night	28% 12% 32% 22% 5% 1	760
	21st to end	Night	34% 10% 32% 20% 4	836

Page generated at 2024-04-07 09:28:12. Version ac07

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