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 2026-08-15.

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% 41%	143978
	Night	11% 8% 3 8% 4 4 4 3 5% 6% 44%	138246
Transparency	Day	28% 34% 8% 17% 11% 1	147580
	Night	28% 35% 8% 17% 12% 2	142724
Seeing	Day	15% 10% 30% 27% 14% 4	18257
	Night	15% 9% 34% 30% 11% 1	28018

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 12% 5% 5% 5% 3 5% 7% 30%	4871
	11th to 20th	Day	6% 8% 3 10% 6% 6% 9% 4 5% 6% 37%	5310
	21st to end	Day	10% 13% 6% 14% 5% 6% 4 3 4 5% 31%	5812
February	1st to 10th	Day	12% 11% 4 10% 6% 6% 5% 3 6% 8% 30%	1890
	11th to 20th	Day	12% 11% 4 9% 5% 5% 4 3 5% 6% 34%	1844
	21st to end	Day	13% 9% 2 8% 4 4 3 3 5% 6% 41%	1709
March	1st to 10th	Day	17% 10% 4 7% 3 3 3 2 3 4 44%	5046
	11th to 20th	Day	9% 7% 3 7% 4 4 4 3 4 8% 46%	5090
	21st to end	Day	16% 13% 4 7% 5% 5% 5% 4 6% 7% 29%	5583
April	1st to 10th	Day	17% 10% 3 7% 5% 3 4 3 5% 6% 37%	2502
	11th to 20th	Day	16% 9% 3 7% 4 4 4 3 5% 6% 39%	2494
	21st to end	Day	20% 8% 3 8% 4 4 4 3 4 7% 35%	2625
May	1st to 10th	Day	13% 7% 3 7% 4 4 4 4 6% 8% 39%	7617
	11th to 20th	Day	15% 6% 2 5% 4 4 4 4 6% 8% 44%	7923
	21st to end	Day	17% 8% 3 7% 4 4 4 4 5% 7% 37%	9047
June	1st to 10th	Day	8% 5% 2 6% 5% 4 5% 5% 7% 8% 43%	2940
	11th to 20th	Day	8% 5% 2 6% 4 5% 5% 4 7% 8% 46%	2940
	21st to end	Day	10% 5% 2 5% 5% 5% 5% 4 6% 8% 44%	2940
July	1st to 10th	Day	9% 6% 2 7% 4 5% 5% 4 7% 9% 42%	8280
	11th to 20th	Day	6% 4 2 5% 4 4 5% 4 5% 8% 52%	7965
	21st to end	Day	10% 5% 2 6% 4 5% 5% 5% 7% 10% 41%	8337
August	1st to 10th	Day	6% 4 2 5% 4 5% 6% 5% 7% 12% 45%	4364
	11th to 20th	Day	14% 6% 2 5% 4 4 5% 4 6% 9% 42%	4224
	21st to end	Day	7% 4 2 6% 5% 4 5% 3 6% 9% 50%	4350
September	1st to 10th	Day	13% 4 2 4 3 3 3 2 5% 7% 54%	2400
	11th to 20th	Day	10% 4 2 6% 4 4 4 4 6% 8% 49%	2333
	21st to end	Day	11% 5% 2 5% 3 3 4 3 5% 7% 51%	2124
October	1st to 10th	Day	13% 6% 2 6% 4 3 4 2 4 6% 50%	2000
	11th to 20th	Day	13% 8% 3 5% 3 3 3 3 4 6% 50%	2000
	21st to end	Day	15% 8% 3 7% 4 4 4 4 4 6% 43%	2200
November	1st to 10th	Day	10% 6% 3 4 4 4 4 4 5% 7% 49%	1989
	11th to 20th	Day	13% 9% 2 7% 4 3 4 3 4 7% 44%	1701
	21st to end	Day	16% 13% 3 6% 4 3 3 3 4 6% 39%	1680
December	1st to 10th	Day	7% 7% 3 7% 5% 4 4 3 3 7% 52%	2690
	11th to 20th	Day	12% 9% 3 11% 6% 5% 5% 3 5% 7% 35%	3088
	21st to end	Day	20% 15% 8% 14% 5% 4 4 3 4 5% 18%	4070
January	1st to 10th	Night	10% 12% 4 17% 6% 4 4 3 4 6% 29%	8035
	11th to 20th	Night	7% 8% 4 10% 6% 5% 6% 4 6% 6% 39%	7680
	21st to end	Night	10% 13% 6% 11% 5% 5% 4 2 4 5% 36%	8402
February	1st to 10th	Night	12% 11% 4 10% 5% 5% 5% 3 5% 6% 34%	2730
	11th to 20th	Night	11% 10% 4 9% 5% 4 3 3 4 6% 41%	2663
	21st to end	Night	12% 10% 3 7% 4 4 4 3 4 5% 44%	2112
March	1st to 10th	Night	17% 9% 3 6% 3 3 3 3 3 4 47%	5029
	11th to 20th	Night	11% 7% 2 5% 3 4 3 3 4 6% 52%	5090
	21st to end	Night	15% 11% 4 11% 4 5% 4 3 5% 6% 32%	5588
April	1st to 10th	Night	13% 7% 3 6% 4 3 4 3 6% 6% 46%	2116
	11th to 20th	Night	14% 8% 3 7% 5% 4 3 3 5% 6% 43%	2075
	21st to end	Night	16% 9% 3 6% 4 4 4 3 5% 8% 40%	1992
May	1st to 10th	Night	11% 6% 2 6% 4 5% 5% 4 5% 7% 45%	5266
	11th to 20th	Night	13% 5% 2 6% 4 3 4 3 5% 7% 47%	4968
	21st to end	Night	15% 7% 3 7% 4 4 4 3 5% 6% 41%	5139
June	1st to 10th	Night	8% 4 2 4 3 4 4 5% 8% 8% 51%	1680
	11th to 20th	Night	5% 5% 2 5% 4 4 5% 3 7% 11% 49%	1680
	21st to end	Night	7% 4 2 6% 4 4 4 4 7% 7% 51%	1680
July	1st to 10th	Night	7% 3 2 5% 4 4 5% 4 6% 10% 50%	4708
	11th to 20th	Night	5% 3 2 5% 4 4 4 4 5% 8% 56%	5004
	21st to end	Night	9% 5% 2 5% 4 4 5% 4 7% 10% 45%	5770
August	1st to 10th	Night	4 3 1 4 3 4 4 4 6% 10% 57%	3016
	11th to 20th	Night	10% 6% 2 5% 3 4 4 3 5% 7% 52%	2924
	21st to end	Night	6% 4 1 4 3 3 3 3 5% 8% 59%	3547
September	1st to 10th	Night	10% 4 2 5% 3 3 3 3 5% 5% 58%	2000
	11th to 20th	Night	10% 5% 1 5% 4 4 3 3 5% 7% 52%	2064
	21st to end	Night	8% 5% 2 5% 4 3 3 4 5% 6% 56%	2255
October	1st to 10th	Night	13% 6% 2 4 3 3 3 2 4 6% 53%	2400
	11th to 20th	Night	14% 6% 2 5% 3 3 3 2 4 5% 52%	2400
	21st to end	Night	16% 8% 2 6% 4 4 4 2 3 5% 46%	2640
November	1st to 10th	Night	8% 5% 2 5% 3 3 3 3 6% 7% 55%	2528
	11th to 20th	Night	11% 7% 3 6% 4 3 3 3 5% 7% 49%	2916
	21st to end	Night	16% 11% 3 6% 4 3 3 3 4 5% 42%	2940
December	1st to 10th	Night	7% 9% 3 7% 4 3 4 3 4 6% 50%	4720
	11th to 20th	Night	12% 9% 3 10% 4 4 3 3 5% 7% 40%	5339
	21st to end	Night	20% 17% 6% 11% 4 4 4 3 4 4 23%	7150

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% 22% 10% 13% 9% 1	4872
	11th to 20th	Day	38% 21% 6% 17% 14% 3	5310
	21st to end	Day	45% 22% 8% 18% 6% 1	5812
February	1st to 10th	Day	24% 59% 5% 8% 4	1890
	11th to 20th	Day	23% 58% 4 8% 6% 1	1853
	21st to end	Day	18% 59% 4 10% 9% 1	1709
March	1st to 10th	Day	32% 29% 4 18% 16% 2	5046
	11th to 20th	Day	23% 28% 6% 20% 20% 2	5090
	21st to end	Day	38% 30% 14% 13% 3 1	5585
April	1st to 10th	Day	23% 59% 4 10% 4	2502
	11th to 20th	Day	18% 60% 6% 9% 5% 1	2494
	21st to end	Day	22% 59% 4 9% 5%	2625
May	1st to 10th	Day	31% 25% 8% 20% 16%	7655
	11th to 20th	Day	29% 25% 9% 24% 12% 2	7927
	21st to end	Day	37% 23% 7% 19% 13%	9061
June	1st to 10th	Day	12% 61% 6% 12% 7% 2	2940
	11th to 20th	Day	15% 60% 6% 11% 8% 1	2940
	21st to end	Day	16% 59% 9% 12% 4	2940
July	1st to 10th	Day	31% 22% 13% 24% 10% 1	8211
	11th to 20th	Day	25% 22% 12% 23% 15% 3	7891
	21st to end	Day	31% 23% 16% 24% 6%	8155
August	1st to 10th	Day	20% 37% 10% 22% 10%	4350
	11th to 20th	Day	28% 37% 8% 17% 10%	4263
	21st to end	Day	22% 37% 13% 19% 7% 1	4349
September	1st to 10th	Day	12% 58% 8% 12% 9% 1	2400
	11th to 20th	Day	14% 58% 6% 14% 7% 1	2333
	21st to end	Day	15% 57% 5% 13% 9%	2124
October	1st to 10th	Day	13% 35% 2 10% 38% 2	3260
	11th to 20th	Day	9% 35% 5% 18% 25% 7%	3240
	21st to end	Day	23% 35% 6% 19% 15% 2	3538
November	1st to 10th	Day	18% 54% 7% 11% 9% 1	1989
	11th to 20th	Day	20% 54% 4 12% 10%	1701
	21st to end	Day	24% 54% 5% 11% 6%	1680
December	1st to 10th	Day	20% 35% 13% 22% 10% 1	2690
	11th to 20th	Day	33% 31% 9% 18% 8%	3085
	21st to end	Day	56% 26% 8% 7% 2	4070
January	1st to 10th	Night	49% 22% 11% 12% 6% 1	8036
	11th to 20th	Night	36% 21% 7% 17% 16% 3	7680
	21st to end	Night	42% 22% 9% 15% 10% 2	8402
February	1st to 10th	Night	21% 59% 6% 9% 4 1	2730
	11th to 20th	Night	21% 58% 4 11% 6% 1	2664
	21st to end	Night	17% 59% 4 8% 10% 2	2112
March	1st to 10th	Night	33% 28% 3 16% 17% 2	5029
	11th to 20th	Night	22% 28% 4 23% 18% 5%	5090
	21st to end	Night	37% 30% 11% 15% 5% 2	5588
April	1st to 10th	Night	18% 60% 5% 10% 6% 1	2116
	11th to 20th	Night	16% 61% 6% 10% 6% 1	2075
	21st to end	Night	19% 60% 5% 9% 6% 1	1992
May	1st to 10th	Night	29% 25% 6% 22% 16% 2	5293
	11th to 20th	Night	28% 24% 11% 19% 15% 4	4969
	21st to end	Night	36% 25% 6% 17% 16% 1	5149
June	1st to 10th	Night	11% 60% 7% 13% 8% 2	1680
	11th to 20th	Night	13% 60% 4 14% 7% 2	1680
	21st to end	Night	13% 59% 8% 13% 7% 1	1680
July	1st to 10th	Night	24% 22% 13% 24% 15% 2	4670
	11th to 20th	Night	22% 23% 14% 22% 16% 3	4959
	21st to end	Night	29% 23% 17% 24% 7%	5641
August	1st to 10th	Night	14% 37% 10% 26% 13%	3006
	11th to 20th	Night	23% 37% 9% 18% 13% 1	2951
	21st to end	Night	17% 37% 13% 22% 9% 2	3547
September	1st to 10th	Night	13% 58% 6% 11% 10% 3	2000
	11th to 20th	Night	13% 57% 6% 14% 8% 2	2064
	21st to end	Night	15% 57% 4 12% 11% 1	2255
October	1st to 10th	Night	14% 35% 2 9% 38% 1	3920
	11th to 20th	Night	13% 35% 4 16% 25% 6%	3899
	21st to end	Night	26% 35% 5% 16% 16% 2	4252
November	1st to 10th	Night	15% 54% 6% 14% 9% 2	2528
	11th to 20th	Night	16% 54% 4 14% 10% 2	2916
	21st to end	Night	24% 54% 4 12% 6%	2940
December	1st to 10th	Night	23% 34% 6% 28% 9%	4720
	11th to 20th	Night	30% 33% 9% 18% 10%	5341
	21st to end	Night	53% 26% 6% 10% 3 1	7150

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	20% 14% 35% 24% 6% 1	330
	11th to 20th	Day	19% 18% 42% 18% 3	330
	21st to end	Day	18% 13% 45% 21% 3	363
February	1st to 10th	Day	19% 18% 39% 20% 4 1	330
	11th to 20th	Day	20% 19% 34% 20% 6% 1	330
	21st to end	Day	17% 18% 44% 18% 4	273
March	1st to 10th	Day	20% 18% 43% 16% 3	330
	11th to 20th	Day	22% 16% 35% 23% 5%	330
	21st to end	Day	35% 18% 31% 13% 4	363
April	1st to 10th	Day	27% 15% 34% 18% 6% 1	522
	11th to 20th	Day	21% 17% 34% 20% 6% 1	532
	21st to end	Day	22% 16% 37% 19% 6% 1	645
May	1st to 10th	Day	20% 14% 33% 23% 8% 2	753
	11th to 20th	Day	20% 11% 29% 26% 11% 3	775
	21st to end	Day	17% 10% 26% 26% 16% 3	844
June	1st to 10th	Day	9% 4 24% 33% 24% 6%	780
	11th to 20th	Day	10% 5% 27% 36% 18% 4	780
	21st to end	Day	11% 7% 35% 30% 14% 3	780
July	1st to 10th	Day	9% 3 19% 32% 25% 12%	771
	11th to 20th	Day	8% 4 23% 37% 22% 8%	768
	21st to end	Day	8% 2 20% 39% 27% 4	849
August	1st to 10th	Day	8% 3 21% 38% 25% 5%	776
	11th to 20th	Day	12% 3 18% 38% 24% 6%	736
	21st to end	Day	9% 2 17% 36% 28% 8%	608
September	1st to 10th	Day	13% 4 20% 30% 25% 8%	530
	11th to 20th	Day	8% 3 23% 34% 25% 7%	463
	21st to end	Day	14% 6% 27% 26% 21% 6%	330
October	1st to 10th	Day	18% 6% 30% 25% 14% 7%	330
	11th to 20th	Day	13% 22% 35% 22% 7% 1	330
	21st to end	Day	22% 14% 33% 21% 8% 1	363
November	1st to 10th	Day	16% 11% 42% 22% 7% 2	330
	11th to 20th	Day	19% 16% 35% 22% 6% 2	330
	21st to end	Day	24% 14% 35% 22% 6%	330
December	1st to 10th	Day	10% 18% 42% 21% 7% 2	330
	11th to 20th	Day	20% 15% 37% 21% 6% 2	330
	21st to end	Day	23% 18% 36% 20% 2	363
January	1st to 10th	Night	15% 13% 42% 23% 7%	1050
	11th to 20th	Night	14% 16% 42% 21% 5% 1	1050
	21st to end	Night	16% 12% 43% 25% 4	1155
February	1st to 10th	Night	18% 13% 40% 25% 4	1050
	11th to 20th	Night	17% 13% 40% 25% 4	1029
	21st to end	Night	18% 14% 43% 21% 3 1	728
March	1st to 10th	Night	16% 13% 40% 24% 7%	630
	11th to 20th	Night	21% 11% 38% 24% 6%	630
	21st to end	Night	24% 12% 40% 20% 4	693
April	1st to 10th	Night	17% 15% 41% 24% 3	630
	11th to 20th	Night	18% 16% 37% 23% 6%	623
	21st to end	Night	20% 10% 38% 24% 7% 1	630
May	1st to 10th	Night	16% 8% 34% 34% 7%	630
	11th to 20th	Night	17% 9% 30% 32% 11%	621
	21st to end	Night	15% 4 28% 37% 16%	683
June	1st to 10th	Night	9% 3 25% 40% 21% 2	630
	11th to 20th	Night	8% 5% 28% 40% 17% 1	630
	21st to end	Night	8% 3 33% 40% 16%	630
July	1st to 10th	Night	6% 2 18% 39% 34% 3	615
	11th to 20th	Night	6% 2 18% 45% 27% 3	612
	21st to end	Night	8% 1 16% 47% 27% 1	690
August	1st to 10th	Night	5% 1 19% 48% 24% 3	627
	11th to 20th	Night	8% 2 17% 40% 30% 3	606
	21st to end	Night	8% 2 15% 42% 31% 3	660
September	1st to 10th	Night	12% 3 19% 37% 26% 3	600
	11th to 20th	Night	13% 2 22% 37% 24% 2	600
	21st to end	Night	9% 5% 25% 37% 22% 1	655
October	1st to 10th	Night	16% 6% 28% 32% 15% 2	800
	11th to 20th	Night	17% 8% 39% 27% 8%	800
	21st to end	Night	21% 10% 37% 25% 7%	880
November	1st to 10th	Night	11% 10% 40% 30% 8% 1	820
	11th to 20th	Night	15% 15% 41% 23% 7%	1026
	21st to end	Night	21% 11% 37% 24% 6%	1050
December	1st to 10th	Night	17% 13% 39% 25% 5% 1	1050
	11th to 20th	Night	19% 11% 39% 26% 5% 1	1050
	21st to end	Night	22% 14% 36% 24% 3	1155

Page generated at 2026-08-12 02:37:18. Version ac07

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