Moore-Gosch Memorial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moore-Gosch Memorial Park clear sky chart from 2005-11-06 to 2024-10-24.

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	12% 8% 3 7% 4 4 4 4 5% 7% 40%	101213
	Night	12% 8% 3 7% 4 4 4 3 5% 6% 44%	97636
Transparency	Day	23% 49% 7% 13% 8% 1	101016
	Night	23% 49% 6% 13% 8% 1	97505
Seeing	Day	15% 10% 29% 28% 15% 4	15744
	Night	15% 9% 34% 30% 12% 1	25553

By Month

Percentage Cloud Cover SE (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	12% 13% 4 15% 5% 5% 4 3 5% 6% 27%	2623
	11th to 20th	Day	10% 12% 5% 11% 6% 5% 9% 3 4 6% 28%	2850
	21st to end	Day	14% 15% 7% 17% 5% 6% 4 3 4 5% 20%	3135
February	1st to 10th	Day	13% 12% 4 10% 6% 6% 5% 3 6% 6% 30%	1710
	11th to 20th	Day	12% 11% 4 9% 5% 5% 4 3 6% 6% 35%	1664
	21st to end	Day	15% 10% 2 8% 4 4 3 4 6% 6% 38%	1550
March	1st to 10th	Day	17% 11% 4 7% 4 3 3 2 4 5% 41%	3436
	11th to 20th	Day	10% 8% 3 7% 4 4 4 3 4 6% 46%	3480
	21st to end	Day	20% 16% 5% 8% 5% 4 5% 3 5% 6% 24%	3814
April	1st to 10th	Day	16% 10% 3 6% 5% 3 3 3 6% 6% 38%	2264
	11th to 20th	Day	16% 9% 3 7% 4 4 4 3 5% 6% 39%	2254
	21st to end	Day	21% 8% 3 8% 4 4 3 3 4 6% 36%	2375
May	1st to 10th	Day	17% 7% 3 7% 4 5% 5% 4 6% 8% 35%	4082
	11th to 20th	Day	16% 8% 2 6% 5% 4 5% 4 6% 7% 37%	4238
	21st to end	Day	14% 6% 2 6% 4 4 4 3 5% 8% 45%	4824
June	1st to 10th	Day	8% 5% 2 6% 5% 5% 5% 5% 8% 8% 44%	2660
	11th to 20th	Day	8% 5% 2 5% 4 5% 5% 5% 7% 8% 47%	2660
	21st to end	Day	10% 5% 2 5% 5% 5% 5% 4 6% 8% 44%	2660
July	1st to 10th	Day	10% 7% 2 7% 5% 5% 6% 5% 8% 9% 36%	4440
	11th to 20th	Day	6% 4 1 5% 4 4 4 4 6% 8% 53%	4265
	21st to end	Day	5% 3 2 5% 5% 5% 6% 6% 8% 11% 45%	4465
August	1st to 10th	Day	6% 4 2 4 4 5% 5% 5% 7% 12% 45%	4104
	11th to 20th	Day	14% 6% 2 5% 4 4 5% 5% 6% 9% 41%	4041
	21st to end	Day	7% 4 2 6% 5% 4 5% 3 6% 9% 50%	4217
September	1st to 10th	Day	14% 4 2 4 3 3 3 2 5% 7% 54%	2280
	11th to 20th	Day	10% 3 2 6% 3 4 4 4 6% 8% 50%	2217
	21st to end	Day	11% 5% 2 4 3 4 4 3 5% 7% 51%	2018
October	1st to 10th	Day	13% 6% 2 6% 4 3 4 3 4 6% 49%	1900
	11th to 20th	Day	14% 8% 2 5% 2 3 3 2 4 6% 50%	1900
	21st to end	Day	15% 8% 3 6% 3 4 4 4 4 6% 43%	2010
November	1st to 10th	Day	10% 6% 3 4 4 4 4 4 5% 7% 50%	1797
	11th to 20th	Day	13% 9% 3 8% 4 3 4 3 4 7% 44%	1539
	21st to end	Day	16% 13% 3 6% 4 3 3 3 4 7% 40%	1520
December	1st to 10th	Day	12% 11% 3 8% 6% 5% 4 3 4 7% 37%	1520
	11th to 20th	Day	10% 11% 3 10% 6% 5% 4 4 5% 8% 34%	1918
	21st to end	Day	20% 14% 8% 14% 5% 4 3 3 4 5% 20%	2783
January	1st to 10th	Night	9% 11% 4 19% 6% 5% 4 3 4 5% 29%	4329
	11th to 20th	Night	11% 13% 6% 10% 5% 5% 6% 4 7% 5% 28%	4120
	21st to end	Night	14% 16% 7% 13% 4 5% 4 2 4 6% 26%	4532
February	1st to 10th	Night	13% 11% 4 10% 5% 5% 5% 3 5% 5% 34%	2470
	11th to 20th	Night	11% 10% 3 8% 4 4 3 3 4 6% 42%	2403
	21st to end	Night	13% 11% 4 7% 3 4 4 3 3 5% 43%	1918
March	1st to 10th	Night	14% 9% 3 7% 4 3 3 3 4 5% 45%	3419
	11th to 20th	Night	13% 8% 2 4 3 3 2 3 4 6% 52%	3480
	21st to end	Night	18% 10% 5% 12% 5% 5% 4 3 4 5% 27%	3817
April	1st to 10th	Night	12% 7% 2 6% 5% 3 4 3 5% 6% 47%	1914
	11th to 20th	Night	15% 8% 3 7% 5% 4 3 3 5% 6% 42%	1875
	21st to end	Night	17% 8% 3 6% 4 3 4 3 4 7% 41%	1802
May	1st to 10th	Night	16% 8% 2 6% 4 5% 5% 4 6% 7% 38%	2823
	11th to 20th	Night	13% 7% 2 6% 5% 4 4 4 4 6% 45%	2666
	21st to end	Night	10% 5% 2 5% 4 4 5% 4 5% 7% 49%	2743
June	1st to 10th	Night	7% 4 2 4 3 4 4 5% 8% 8% 51%	1520
	11th to 20th	Night	6% 5% 2 5% 4 3 5% 3 7% 11% 49%	1520
	21st to end	Night	6% 4 2 5% 4 4 4 4 7% 7% 51%	1520
July	1st to 10th	Night	10% 5% 2 6% 4 4 5% 4 5% 8% 48%	2530
	11th to 20th	Night	3 2 1 4 3 3 3 3 6% 9% 63%	2687
	21st to end	Night	6% 4 2 5% 4 4 5% 4 7% 9% 50%	3098
August	1st to 10th	Night	3 3 1 4 3 3 4 4 6% 10% 58%	2836
	11th to 20th	Night	10% 6% 2 5% 3 4 4 3 5% 7% 52%	2798
	21st to end	Night	5% 4 1 4 3 3 3 3 5% 8% 59%	3438
September	1st to 10th	Night	10% 4 2 5% 3 3 3 3 5% 5% 58%	1900
	11th to 20th	Night	10% 5% 1 4 4 4 3 3 5% 7% 54%	1961
	21st to end	Night	8% 5% 2 5% 4 3 3 4 5% 6% 57%	2142
October	1st to 10th	Night	13% 6% 2 4 3 3 3 2 4 6% 53%	2280
	11th to 20th	Night	14% 6% 2 5% 3 3 3 3 4 5% 53%	2280
	21st to end	Night	16% 8% 2 6% 4 3 4 2 3 5% 47%	2413
November	1st to 10th	Night	8% 4 2 4 3 3 3 3 6% 8% 56%	2281
	11th to 20th	Night	11% 7% 3 6% 4 3 3 3 5% 7% 49%	2638
	21st to end	Night	16% 11% 3 5% 4 3 3 3 4 4 44%	2660
December	1st to 10th	Night	11% 12% 3 7% 5% 4 3 3 5% 7% 40%	2660
	11th to 20th	Night	11% 10% 3 10% 5% 3 3 3 5% 5% 42%	3279
	21st to end	Night	19% 16% 7% 13% 5% 4 4 2 3 4 23%	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	38% 38% 9% 9% 4 1	2624
	11th to 20th	Day	38% 37% 7% 14% 4	2850
	21st to end	Day	45% 40% 5% 7% 3	3135
February	1st to 10th	Day	22% 65% 3 6% 4	1710
	11th to 20th	Day	18% 64% 4 7% 6%	1673
	21st to end	Day	17% 65% 3 7% 7% 1	1550
March	1st to 10th	Day	28% 42% 5% 12% 13% 1	3436
	11th to 20th	Day	19% 40% 8% 17% 15% 1	3480
	21st to end	Day	37% 42% 11% 8% 2	3814
April	1st to 10th	Day	19% 65% 4 9% 4	2264
	11th to 20th	Day	15% 66% 6% 8% 5%	2254
	21st to end	Day	19% 65% 3 7% 5%	2375
May	1st to 10th	Day	26% 44% 7% 13% 10%	4120
	11th to 20th	Day	27% 43% 6% 19% 6%	4242
	21st to end	Day	20% 41% 7% 18% 13% 1	4837
June	1st to 10th	Day	9% 66% 6% 10% 7% 2	2660
	11th to 20th	Day	13% 66% 5% 10% 6% 1	2660
	21st to end	Day	13% 65% 8% 10% 4	2660
July	1st to 10th	Day	32% 38% 9% 15% 6% 1	4371
	11th to 20th	Day	18% 37% 10% 23% 12% 1	4191
	21st to end	Day	19% 39% 13% 19% 9% 1	4325
August	1st to 10th	Day	19% 40% 9% 22% 10%	4090
	11th to 20th	Day	28% 38% 8% 16% 10%	4080
	21st to end	Day	22% 38% 13% 19% 6% 1	4216
September	1st to 10th	Day	12% 60% 7% 10% 9% 1	2280
	11th to 20th	Day	12% 61% 6% 13% 8% 1	2217
	21st to end	Day	14% 60% 5% 13% 8%	2018
October	1st to 10th	Day	19% 60% 3 9% 9% 1	1900
	11th to 20th	Day	12% 59% 3 12% 11% 2	1900
	21st to end	Day	17% 61% 3 9% 8% 1	2010
November	1st to 10th	Day	16% 60% 6% 9% 8% 1	1797
	11th to 20th	Day	17% 59% 4 11% 9%	1539
	21st to end	Day	21% 60% 4 10% 5%	1520
December	1st to 10th	Day	21% 60% 5% 8% 4 1	1520
	11th to 20th	Day	22% 48% 9% 17% 4	1915
	21st to end	Day	49% 37% 4 6% 3	2783
January	1st to 10th	Night	41% 38% 6% 10% 5%	4329
	11th to 20th	Night	38% 36% 7% 10% 8% 1	4120
	21st to end	Night	41% 39% 7% 8% 4 1	4532
February	1st to 10th	Night	19% 65% 5% 7% 3 1	2470
	11th to 20th	Night	17% 64% 3 10% 6%	2404
	21st to end	Night	16% 65% 3 6% 8% 2	1918
March	1st to 10th	Night	28% 42% 4 12% 13% 1	3419
	11th to 20th	Night	17% 40% 5% 22% 11% 4	3480
	21st to end	Night	34% 42% 11% 9% 2	3817
April	1st to 10th	Night	15% 66% 5% 9% 5% 1	1914
	11th to 20th	Night	14% 67% 5% 8% 5% 1	1875
	21st to end	Night	15% 65% 4 8% 6% 1	1802
May	1st to 10th	Night	27% 43% 7% 11% 12%	2850
	11th to 20th	Night	24% 42% 8% 17% 9%	2667
	21st to end	Night	19% 42% 6% 14% 17% 1	2751
June	1st to 10th	Night	8% 66% 6% 11% 8% 2	1520
	11th to 20th	Night	10% 66% 4 13% 6% 1	1520
	21st to end	Night	10% 65% 7% 12% 5% 1	1520
July	1st to 10th	Night	27% 37% 6% 18% 10% 3	2490
	11th to 20th	Night	11% 37% 12% 24% 15% 1	2639
	21st to end	Night	19% 39% 15% 14% 13% 1	2999
August	1st to 10th	Night	13% 39% 10% 25% 13%	2826
	11th to 20th	Night	23% 38% 8% 17% 14% 1	2825
	21st to end	Night	17% 38% 13% 22% 8% 2	3438
September	1st to 10th	Night	12% 61% 5% 10% 9% 3	1900
	11th to 20th	Night	10% 60% 6% 14% 8% 2	1961
	21st to end	Night	14% 60% 4 12% 10% 1	2142
October	1st to 10th	Night	19% 60% 3 8% 10% 1	2280
	11th to 20th	Night	11% 60% 4 11% 12% 3	2280
	21st to end	Night	16% 61% 4 8% 10% 1	2413
November	1st to 10th	Night	12% 60% 6% 12% 9% 2	2281
	11th to 20th	Night	13% 60% 3 12% 10% 2	2638
	21st to end	Night	20% 59% 3 11% 6%	2660
December	1st to 10th	Night	19% 60% 4 9% 7% 1	2660
	11th to 20th	Night	20% 49% 6% 17% 7% 1	3281
	21st to end	Night	48% 37% 3 8% 4 1	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	21% 16% 33% 23% 7% 1	270
	11th to 20th	Day	21% 16% 40% 19% 3	270
	21st to end	Day	19% 12% 44% 22% 4	297
February	1st to 10th	Day	21% 17% 37% 19% 4	270
	11th to 20th	Day	19% 17% 34% 21% 7% 1	270
	21st to end	Day	19% 15% 44% 18% 4	225
March	1st to 10th	Day	19% 19% 42% 16% 4	270
	11th to 20th	Day	21% 14% 37% 23% 5%	270
	21st to end	Day	38% 18% 26% 14% 4	297
April	1st to 10th	Day	26% 15% 34% 19% 6% 1	444
	11th to 20th	Day	21% 15% 33% 22% 7% 1	452
	21st to end	Day	22% 16% 35% 19% 7% 1	555
May	1st to 10th	Day	20% 15% 33% 23% 7% 2	653
	11th to 20th	Day	20% 10% 29% 27% 11% 3	675
	21st to end	Day	16% 11% 25% 28% 17% 3	734
June	1st to 10th	Day	8% 4 23% 33% 25% 6%	680
	11th to 20th	Day	10% 5% 26% 37% 19% 4	680
	21st to end	Day	10% 8% 33% 31% 15% 3	680
July	1st to 10th	Day	9% 3 19% 31% 25% 12%	671
	11th to 20th	Day	8% 4 24% 37% 22% 6%	668
	21st to end	Day	7% 1 21% 39% 28% 4	739
August	1st to 10th	Day	7% 3 19% 39% 25% 6%	676
	11th to 20th	Day	12% 3 18% 36% 24% 6%	665
	21st to end	Day	9% 2 17% 36% 28% 8%	563
September	1st to 10th	Day	13% 4 20% 30% 26% 8%	490
	11th to 20th	Day	8% 3 24% 33% 25% 7%	427
	21st to end	Day	14% 6% 29% 27% 18% 5%	300
October	1st to 10th	Day	18% 7% 29% 25% 14% 7%	300
	11th to 20th	Day	12% 23% 35% 22% 7% 1	300
	21st to end	Day	23% 15% 30% 22% 9% 2	306
November	1st to 10th	Day	16% 10% 44% 20% 8% 2	270
	11th to 20th	Day	18% 17% 34% 22% 7% 2	270
	21st to end	Day	23% 13% 36% 23% 6%	270
December	1st to 10th	Day	9% 18% 41% 21% 8% 3	270
	11th to 20th	Day	19% 13% 37% 23% 6% 2	270
	21st to end	Day	23% 20% 36% 19% 2	297
January	1st to 10th	Night	14% 13% 42% 23% 8%	950
	11th to 20th	Night	15% 15% 41% 22% 6% 1	950
	21st to end	Night	17% 12% 41% 26% 5%	1045
February	1st to 10th	Night	19% 12% 39% 25% 4	950
	11th to 20th	Night	17% 12% 40% 26% 5%	929
	21st to end	Night	19% 14% 42% 20% 4 1	662
March	1st to 10th	Night	15% 13% 41% 24% 7%	570
	11th to 20th	Night	21% 11% 36% 25% 6%	570
	21st to end	Night	26% 11% 38% 21% 4	627
April	1st to 10th	Night	15% 16% 41% 24% 4	570
	11th to 20th	Night	19% 15% 36% 23% 6%	563
	21st to end	Night	20% 10% 38% 24% 8% 1	570
May	1st to 10th	Night	17% 9% 35% 32% 7%	570
	11th to 20th	Night	17% 8% 30% 33% 11%	561
	21st to end	Night	14% 5% 28% 36% 17%	617
June	1st to 10th	Night	8% 3 25% 40% 21% 2	570
	11th to 20th	Night	8% 5% 27% 40% 18% 1	570
	21st to end	Night	7% 2 33% 40% 17%	570
July	1st to 10th	Night	6% 2 17% 38% 34% 3	555
	11th to 20th	Night	5% 2 19% 45% 26% 3	552
	21st to end	Night	6% 1 17% 46% 28% 1	624
August	1st to 10th	Night	4 1 20% 49% 24% 3	567
	11th to 20th	Night	8% 3 17% 40% 29% 3	564
	21st to end	Night	8% 2 15% 42% 30% 3	627
September	1st to 10th	Night	12% 3 19% 37% 26% 4	570
	11th to 20th	Night	13% 2 22% 37% 24% 2	570
	21st to end	Night	9% 6% 26% 37% 21% 1	622
October	1st to 10th	Night	16% 6% 28% 32% 15% 2	760
	11th to 20th	Night	16% 9% 39% 28% 8%	760
	21st to end	Night	21% 10% 37% 24% 7%	805
November	1st to 10th	Night	10% 10% 39% 31% 9% 1	740
	11th to 20th	Night	14% 15% 41% 22% 7%	928
	21st to end	Night	21% 11% 37% 25% 6%	950
December	1st to 10th	Night	17% 13% 38% 25% 6% 1	950
	11th to 20th	Night	19% 10% 38% 28% 5% 1	950
	21st to end	Night	21% 15% 37% 23% 3	1045

Page generated at 2024-10-21 01:20:04. Version ac07

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