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 2024-11-05.

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 6% 7% 32%	101577
	Night	17% 11% 4 9% 5% 4 4 3 5% 6% 31%	97475
Transparency	Day	50% 6% 13% 21% 9% 1	105047
	Night	53% 6% 12% 19% 9% 1	102094
Seeing	Day	21% 12% 28% 24% 12% 4	14533
	Night	22% 9% 29% 29% 10% 1	23557

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% 17% 5% 12% 6% 4 4 3 5% 4 23%	2517
	11th to 20th	Day	14% 13% 6% 11% 7% 6% 5% 4 5% 6% 22%	2520
	21st to end	Day	14% 19% 6% 11% 7% 6% 5% 4 5% 6% 17%	2835
February	1st to 10th	Day	15% 17% 4 11% 6% 4 4 3 6% 6% 25%	1710
	11th to 20th	Day	14% 13% 5% 11% 6% 5% 5% 4 5% 5% 28%	1705
	21st to end	Day	19% 14% 4 8% 5% 4 5% 3 6% 5% 26%	1570
March	1st to 10th	Day	19% 12% 4 10% 6% 5% 4 3 4 5% 27%	3116
	11th to 20th	Day	13% 17% 4 9% 6% 5% 5% 4 4 6% 27%	3408
	21st to end	Day	15% 8% 3 8% 6% 4 4 3 5% 6% 39%	4084
April	1st to 10th	Day	22% 11% 3 8% 4 3 4 2 4 6% 33%	2280
	11th to 20th	Day	21% 8% 4 7% 5% 4 3 2 5% 6% 35%	2254
	21st to end	Day	22% 10% 4 7% 4 5% 4 3 4 5% 30%	2397
May	1st to 10th	Day	20% 9% 3 7% 5% 4 5% 4 6% 7% 30%	4426
	11th to 20th	Day	18% 9% 3 9% 5% 4 4 3 5% 7% 32%	4398
	21st to end	Day	15% 7% 2 7% 4 5% 5% 4 6% 8% 37%	4837
June	1st to 10th	Day	22% 9% 3 7% 6% 5% 4 4 5% 6% 29%	2660
	11th to 20th	Day	14% 7% 2 6% 5% 5% 5% 5% 7% 8% 37%	2660
	21st to end	Day	20% 8% 2 7% 5% 5% 4 4 6% 9% 31%	2660
July	1st to 10th	Day	11% 7% 3 7% 5% 6% 5% 5% 8% 9% 35%	4440
	11th to 20th	Day	12% 7% 3 6% 4 5% 5% 4 8% 9% 37%	4440
	21st to end	Day	11% 6% 2 5% 4 4 5% 5% 7% 8% 43%	4814
August	1st to 10th	Day	14% 7% 3 8% 5% 5% 5% 4 6% 9% 34%	4423
	11th to 20th	Day	15% 7% 2 6% 4 4 4 4 6% 9% 39%	3933
	21st to end	Day	15% 6% 2 6% 4 5% 5% 4 6% 9% 38%	4180
September	1st to 10th	Day	13% 6% 2 5% 4 4 5% 4 6% 8% 43%	2280
	11th to 20th	Day	13% 6% 2 4 4 4 4 3 5% 6% 49%	2252
	21st to end	Day	17% 7% 2 7% 3 3 4 3 6% 7% 41%	2074
October	1st to 10th	Day	20% 8% 2 7% 4 4 4 4 5% 6% 36%	1900
	11th to 20th	Day	19% 11% 3 8% 6% 4 6% 4 5% 6% 29%	1900
	21st to end	Day	24% 11% 3 8% 5% 5% 5% 4 4 5% 28%	1905
November	1st to 10th	Day	16% 9% 5% 6% 4 5% 4 5% 6% 7% 32%	1708
	11th to 20th	Day	17% 13% 4 9% 4 4 5% 4 6% 7% 28%	1573
	21st to end	Day	19% 14% 4 10% 6% 6% 6% 3 5% 7% 21%	1520
December	1st to 10th	Day	23% 15% 6% 11% 6% 4 5% 4 5% 5% 17%	1520
	11th to 20th	Day	22% 15% 5% 9% 5% 4 4 3 4 5% 22%	1906
	21st to end	Day	26% 19% 5% 10% 5% 4 3 2 3 4 20%	2772
January	1st to 10th	Night	17% 17% 6% 11% 6% 4 4 3 5% 5% 21%	4429
	11th to 20th	Night	12% 15% 6% 14% 7% 6% 5% 4 6% 6% 20%	4440
	21st to end	Night	17% 19% 7% 12% 5% 5% 4 2 4 4 21%	4820
February	1st to 10th	Night	15% 14% 5% 12% 7% 6% 5% 4 5% 5% 22%	2470
	11th to 20th	Night	14% 14% 4 12% 6% 4 4 3 5% 5% 28%	2361
	21st to end	Night	15% 15% 5% 9% 6% 5% 4 2 4 5% 29%	1884
March	1st to 10th	Night	20% 12% 4 8% 5% 4 4 3 4 4 32%	3724
	11th to 20th	Night	18% 16% 5% 10% 6% 4 4 3 4 6% 26%	3548
	21st to end	Night	15% 12% 3 7% 4 4 4 3 4 6% 39%	3547
April	1st to 10th	Night	22% 11% 3 7% 5% 4 4 3 4 5% 31%	1900
	11th to 20th	Night	20% 9% 3 7% 5% 4 4 3 5% 5% 35%	1875
	21st to end	Night	21% 9% 3 7% 4 4 3 3 5% 6% 34%	1799
May	1st to 10th	Night	19% 9% 4 8% 5% 5% 5% 4 6% 7% 28%	2514
	11th to 20th	Night	20% 9% 3 7% 4 4 5% 3 6% 6% 36%	2495
	21st to end	Night	14% 7% 3 6% 5% 4 5% 5% 6% 7% 38%	2738
June	1st to 10th	Night	17% 7% 2 6% 6% 6% 6% 5% 6% 9% 30%	1520
	11th to 20th	Night	15% 7% 3 7% 4 4 4 3 6% 9% 39%	1520
	21st to end	Night	18% 8% 2 6% 4 4 4 5% 7% 8% 34%	1520
July	1st to 10th	Night	12% 8% 3 8% 5% 5% 5% 5% 6% 7% 35%	2520
	11th to 20th	Night	12% 6% 3 7% 4 4 4 4 7% 8% 41%	2520
	21st to end	Night	11% 7% 3 6% 4 4 5% 4 6% 8% 41%	2739
August	1st to 10th	Night	14% 7% 2 8% 4 4 4 4 6% 7% 38%	2506
	11th to 20th	Night	15% 7% 2 7% 4 4 5% 3 5% 8% 40%	2859
	21st to end	Night	12% 7% 2 7% 5% 4 5% 4 6% 8% 40%	3476
September	1st to 10th	Night	12% 5% 2 6% 6% 5% 5% 4 5% 6% 44%	1900
	11th to 20th	Night	14% 5% 2 6% 3 3 2 3 5% 7% 50%	1928
	21st to end	Night	16% 6% 2 7% 5% 3 4 4 5% 6% 43%	2104
October	1st to 10th	Night	19% 8% 2 6% 5% 4 4 3 5% 7% 37%	2280
	11th to 20th	Night	20% 9% 3 7% 4 5% 5% 3 5% 6% 33%	2280
	21st to end	Night	22% 9% 3 8% 5% 5% 5% 3 4 6% 29%	2693
November	1st to 10th	Night	19% 11% 4 8% 5% 4 3 3 4 6% 34%	2470
	11th to 20th	Night	18% 11% 3 8% 6% 5% 4 3 5% 5% 31%	2604
	21st to end	Night	22% 12% 5% 10% 5% 5% 4 3 4 6% 24%	2660
December	1st to 10th	Night	21% 15% 6% 10% 6% 5% 5% 4 5% 5% 17%	2660
	11th to 20th	Night	23% 15% 5% 8% 5% 4 4 3 4 4 25%	3288
	21st to end	Night	30% 17% 4 11% 4 3 3 2 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	55% 3 8% 19% 12% 3	2280
	11th to 20th	Day	51% 4 8% 20% 16% 2	2254
	21st to end	Day	55% 5% 8% 15% 13% 3	2397
May	1st to 10th	Day	51% 6% 10% 21% 10% 2	4440
	11th to 20th	Day	50% 7% 14% 18% 9% 1	4402
	21st to end	Day	43% 8% 12% 23% 13% 1	4837
June	1st to 10th	Day	53% 6% 11% 17% 11% 1	2660
	11th to 20th	Day	43% 7% 12% 24% 12% 2	2660
	21st to end	Day	49% 7% 13% 20% 10% 1	2660
July	1st to 10th	Day	42% 7% 13% 27% 11%	4370
	11th to 20th	Day	40% 8% 14% 30% 8%	4365
	21st to end	Day	37% 7% 14% 33% 9%	4661
August	1st to 10th	Day	45% 7% 15% 23% 9%	4409
	11th to 20th	Day	41% 7% 17% 28% 7%	3972
	21st to end	Day	41% 7% 17% 23% 11%	4180
September	1st to 10th	Day	38% 7% 15% 27% 13%	2280
	11th to 20th	Day	36% 6% 12% 32% 14%	2252
	21st to end	Day	42% 7% 14% 27% 10%	2074
October	1st to 10th	Day	47% 5% 11% 28% 8%	3160
	11th to 20th	Day	48% 5% 15% 25% 7%	3140
	21st to end	Day	48% 5% 17% 23% 6%	3117
November	1st to 10th	Day	51% 6% 14% 21% 7% 1	1708
	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	54% 4 9% 18% 13% 2	1900
	11th to 20th	Night	51% 5% 8% 19% 15% 2	1875
	21st to end	Night	51% 5% 9% 17% 15% 4	1799
May	1st to 10th	Night	52% 8% 9% 18% 9% 3	2520
	11th to 20th	Night	48% 7% 11% 18% 13% 2	2496
	21st to end	Night	40% 9% 11% 21% 17% 2	2739
June	1st to 10th	Night	48% 8% 13% 19% 11% 1	1520
	11th to 20th	Night	42% 5% 13% 22% 17% 2	1520
	21st to end	Night	46% 7% 15% 19% 12% 1	1520
July	1st to 10th	Night	46% 8% 12% 20% 14% 1	2480
	11th to 20th	Night	38% 7% 15% 32% 8%	2472
	21st to end	Night	38% 9% 15% 22% 15%	2651
August	1st to 10th	Night	43% 7% 15% 26% 9%	2496
	11th to 20th	Night	43% 6% 15% 28% 7%	2886
	21st to end	Night	40% 7% 15% 25% 12% 1	3476
September	1st to 10th	Night	40% 7% 10% 27% 16% 1	1900
	11th to 20th	Night	34% 6% 13% 34% 12% 1	1928
	21st to end	Night	41% 6% 12% 27% 13%	2104
October	1st to 10th	Night	44% 6% 13% 28% 10%	3800
	11th to 20th	Night	46% 5% 14% 26% 9%	3779
	21st to end	Night	48% 6% 17% 20% 10%	4431
November	1st to 10th	Night	52% 5% 13% 21% 8% 1	2470
	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% 16% 29% 21% 8% 1	460
	11th to 20th	Day	27% 18% 25% 16% 11% 2	452
	21st to end	Day	27% 14% 29% 17% 10% 2	460
May	1st to 10th	Day	24% 11% 30% 24% 8% 3	463
	11th to 20th	Day	17% 12% 33% 23% 12% 4	487
	21st to end	Day	17% 12% 30% 25% 13% 2	529
June	1st to 10th	Day	26% 10% 24% 26% 9% 4	490
	11th to 20th	Day	15% 11% 27% 30% 13% 4	490
	21st to end	Day	23% 11% 26% 23% 13% 4	490
July	1st to 10th	Day	14% 8% 23% 32% 18% 5%	485
	11th to 20th	Day	12% 9% 28% 29% 19% 4	484
	21st to end	Day	14% 6% 26% 33% 18% 3	532
August	1st to 10th	Day	16% 7% 19% 35% 19% 5%	486
	11th to 20th	Day	14% 5% 20% 31% 20% 9%	479
	21st to end	Day	16% 7% 24% 29% 16% 9%	539
September	1st to 10th	Day	15% 7% 28% 22% 18% 11%	490
	11th to 20th	Day	12% 6% 23% 23% 23% 13%	490
	21st to end	Day	18% 11% 29% 19% 18% 6%	490
October	1st to 10th	Day	23% 12% 25% 19% 15% 6%	490
	11th to 20th	Day	24% 14% 31% 20% 8% 2	490
	21st to end	Day	31% 13% 25% 22% 8%	442
November	1st to 10th	Day	24% 16% 27% 22% 9% 1	378
	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% 29% 28% 5%	760
	11th to 20th	Night	23% 13% 33% 23% 8%	751
	21st to end	Night	27% 8% 29% 27% 8% 1	659
May	1st to 10th	Night	24% 8% 29% 29% 8% 3	380
	11th to 20th	Night	23% 6% 31% 30% 10% 1	374
	21st to end	Night	16% 3 36% 32% 13%	411
June	1st to 10th	Night	18% 4 28% 40% 10%	380
	11th to 20th	Night	16% 6% 28% 37% 12% 1	380
	21st to end	Night	18% 6% 27% 34% 16% 1	380
July	1st to 10th	Night	11% 6% 25% 41% 18%	370
	11th to 20th	Night	13% 2 24% 43% 18% 1	368
	21st to end	Night	12% 4 23% 46% 14% 1	416
August	1st to 10th	Night	14% 3 19% 45% 19% 1	378
	11th to 20th	Night	15% 4 17% 37% 26% 2	599
	21st to end	Night	14% 5% 23% 38% 19% 2	836
September	1st to 10th	Night	13% 7% 23% 39% 17% 1	760
	11th to 20th	Night	17% 5% 18% 33% 24% 3	760
	21st to end	Night	18% 6% 26% 27% 21% 2	760
October	1st to 10th	Night	24% 5% 26% 29% 14% 1	760
	11th to 20th	Night	25% 7% 29% 28% 10%	760
	21st to end	Night	28% 11% 28% 28% 6%	836
November	1st to 10th	Night	27% 10% 26% 28% 9% 1	760
	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 2024-11-03 02:11:25. Version ac07

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