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 2025-04-11.

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%	113671
	Night	11% 8% 3 8% 4 4 4 3 5% 6% 44%	114802
Transparency	Day	25% 42% 7% 15% 10% 1	117314
	Night	26% 41% 7% 15% 11% 2	119302
Seeing	Day	15% 10% 29% 27% 14% 4	16260
	Night	15% 9% 34% 30% 11% 1	26291

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% 12% 4 14% 5% 5% 5% 3 5% 7% 27%	3755
	11th to 20th	Day	7% 9% 4 11% 5% 6% 9% 4 4 5% 36%	4080
	21st to end	Day	11% 13% 6% 14% 5% 6% 5% 3 4 5% 28%	4488
February	1st to 10th	Day	13% 11% 4 10% 6% 6% 5% 3 6% 7% 30%	1800
	11th to 20th	Day	12% 12% 4 9% 5% 5% 4 3 6% 6% 34%	1754
	21st to end	Day	14% 9% 2 8% 4 4 3 4 6% 6% 40%	1630
March	1st to 10th	Day	17% 10% 4 6% 3 3 3 2 3 4 45%	4936
	11th to 20th	Day	9% 7% 3 7% 4 4 4 3 4 8% 47%	4980
	21st to end	Day	16% 13% 4 7% 5% 5% 5% 4 6% 7% 28%	5462
April	1st to 10th	Day	16% 10% 3 6% 5% 3 3 3 5% 6% 38%	2383
	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%	2090
November	1st to 10th	Day	11% 6% 3 4 4 4 4 4 5% 7% 49%	1893
	11th to 20th	Day	13% 9% 3 7% 4 3 4 3 4 7% 44%	1620
	21st to end	Day	15% 13% 3 6% 4 3 3 3 4 6% 40%	1600
December	1st to 10th	Day	7% 7% 2 7% 5% 4 4 3 3 7% 52%	2610
	11th to 20th	Day	11% 8% 3 11% 6% 5% 5% 3 5% 7% 35%	3008
	21st to end	Day	20% 15% 8% 14% 4 5% 4 3 4 5% 18%	3982
January	1st to 10th	Night	10% 11% 5% 19% 7% 5% 4 3 4 5% 26%	6193
	11th to 20th	Night	9% 11% 5% 11% 6% 5% 6% 4 6% 5% 33%	5900
	21st to end	Night	12% 13% 5% 11% 4 5% 4 2 4 5% 34%	6490
February	1st to 10th	Night	13% 11% 4 10% 5% 5% 5% 3 5% 6% 34%	2600
	11th to 20th	Night	11% 10% 4 8% 5% 4 4 3 4 6% 41%	2533
	21st to end	Night	12% 11% 4 7% 3 4 4 3 3 5% 44%	2015
March	1st to 10th	Night	17% 9% 3 6% 3 3 3 3 3 4 47%	4919
	11th to 20th	Night	11% 7% 2 5% 3 3 3 3 4 6% 53%	4980
	21st to end	Night	15% 11% 4 11% 4 5% 4 3 5% 5% 31%	5467
April	1st to 10th	Night	12% 7% 2 6% 5% 3 4 3 6% 6% 47%	2015
	11th to 20th	Night	15% 8% 3 7% 5% 4 3 3 5% 6% 42%	1881
	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% 46%	2508
November	1st to 10th	Night	9% 5% 2 4 3 3 3 3 6% 7% 55%	2405
	11th to 20th	Night	11% 7% 3 6% 4 3 3 3 5% 7% 49%	2777
	21st to end	Night	15% 11% 3 6% 4 3 3 3 4 5% 43%	2800
December	1st to 10th	Night	7% 9% 3 7% 4 3 3 3 4 6% 51%	4580
	11th to 20th	Night	12% 9% 3 10% 4 3 3 3 5% 7% 40%	5199
	21st to end	Night	20% 17% 6% 11% 4 4 4 3 3 4 23%	6996

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	44% 28% 9% 12% 7% 1	3756
	11th to 20th	Day	37% 27% 6% 15% 12% 3	4080
	21st to end	Day	43% 29% 7% 15% 5% 1	4488
February	1st to 10th	Day	23% 62% 4 7% 4	1800
	11th to 20th	Day	21% 61% 4 7% 6% 1	1763
	21st to end	Day	16% 62% 3 8% 9% 1	1630
March	1st to 10th	Day	31% 30% 4 18% 16% 2	4936
	11th to 20th	Day	23% 29% 6% 20% 20% 2	4980
	21st to end	Day	38% 30% 14% 13% 3 1	5464
April	1st to 10th	Day	21% 62% 4 9% 4	2383
	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	12% 36% 2 10% 38% 2	3160
	11th to 20th	Day	8% 36% 4 19% 25% 7%	3140
	21st to end	Day	23% 37% 5% 19% 15% 2	3428
November	1st to 10th	Day	17% 57% 7% 9% 8% 1	1893
	11th to 20th	Day	19% 56% 4 11% 10%	1620
	21st to end	Day	22% 57% 5% 11% 5%	1600
December	1st to 10th	Day	19% 36% 13% 22% 10% 1	2610
	11th to 20th	Day	33% 32% 9% 18% 8%	3005
	21st to end	Day	57% 27% 8% 6% 2	3982
January	1st to 10th	Night	50% 27% 7% 11% 5% 1	6193
	11th to 20th	Night	39% 26% 8% 12% 13% 2	5900
	21st to end	Night	40% 28% 6% 12% 11% 2	6490
February	1st to 10th	Night	20% 62% 6% 7% 4 1	2600
	11th to 20th	Night	20% 60% 4 9% 6% 1	2534
	21st to end	Night	16% 62% 3 7% 10% 2	2015
March	1st to 10th	Night	32% 29% 3 16% 17% 2	4919
	11th to 20th	Night	21% 29% 4 23% 18% 5%	4980
	21st to end	Night	38% 31% 11% 14% 5% 2	5467
April	1st to 10th	Night	16% 63% 5% 10% 5% 1	2015
	11th to 20th	Night	14% 67% 5% 8% 5% 1	1881
	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	14% 36% 2 9% 38% 1	3800
	11th to 20th	Night	12% 36% 4 16% 26% 6%	3779
	21st to end	Night	25% 36% 5% 16% 15% 2	4120
November	1st to 10th	Night	14% 57% 6% 13% 9% 2	2405
	11th to 20th	Night	15% 57% 4 12% 10% 2	2777
	21st to end	Night	22% 56% 4 12% 6%	2800
December	1st to 10th	Night	21% 35% 6% 29% 9%	4580
	11th to 20th	Night	29% 34% 9% 18% 10%	5201
	21st to end	Night	54% 27% 6% 10% 3 1	6996

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% 14% 33% 24% 6% 1	300
	11th to 20th	Day	20% 18% 41% 18% 3	300
	21st to end	Day	18% 13% 45% 22% 3	330
February	1st to 10th	Day	20% 17% 39% 19% 4	300
	11th to 20th	Day	20% 18% 35% 20% 7% 1	300
	21st to end	Day	18% 16% 43% 18% 4	249
March	1st to 10th	Day	19% 19% 43% 16% 3	300
	11th to 20th	Day	21% 15% 36% 23% 4	300
	21st to end	Day	37% 17% 28% 14% 4	330
April	1st to 10th	Day	26% 14% 34% 19% 6% 1	483
	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	22% 15% 31% 22% 9% 2	330
November	1st to 10th	Day	17% 10% 42% 22% 7% 2	300
	11th to 20th	Day	20% 17% 34% 20% 7% 2	300
	21st to end	Day	22% 14% 36% 22% 5%	300
December	1st to 10th	Day	8% 18% 42% 21% 7% 3	300
	11th to 20th	Day	19% 15% 38% 21% 6% 2	300
	21st to end	Day	24% 18% 36% 19% 2	330
January	1st to 10th	Night	14% 13% 42% 23% 8%	1000
	11th to 20th	Night	14% 15% 42% 22% 6% 1	1000
	21st to end	Night	17% 11% 42% 26% 4	1100
February	1st to 10th	Night	19% 13% 40% 25% 4	1000
	11th to 20th	Night	17% 13% 41% 25% 4	979
	21st to end	Night	18% 14% 42% 21% 4 1	695
March	1st to 10th	Night	16% 13% 40% 24% 7%	600
	11th to 20th	Night	21% 11% 37% 25% 6%	600
	21st to end	Night	25% 12% 39% 20% 4	660
April	1st to 10th	Night	16% 16% 41% 25% 4	600
	11th to 20th	Night	19% 15% 36% 23% 6%	565
	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% 25% 7%	836
November	1st to 10th	Night	11% 10% 38% 31% 9% 1	780
	11th to 20th	Night	15% 15% 41% 22% 7%	977
	21st to end	Night	20% 11% 38% 25% 6%	1000
December	1st to 10th	Night	17% 13% 38% 25% 6% 1	1000
	11th to 20th	Night	19% 10% 38% 27% 5% 1	1000
	21st to end	Night	22% 15% 36% 24% 3	1100

Page generated at 2025-04-08 08:17:28. Version ac07

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