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 2024-02-20.

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	13% 8% 3 7% 5% 3 5% 4 5% 7% 39%	78466
	Night	12% 8% 4 7% 5% 3 4 4 5% 6% 42%	80777
Transparency	Day	30% 36% 8% 16% 8% 1	78179
	Night	30% 34% 8% 16% 10% 2	80585
Seeing	Day	15% 10% 29% 28% 15% 4	14716
	Night	15% 9% 34% 30% 12% 1	24775

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% 5% 13% 7% 4 5% 4 4 6% 27%	2623
	11th to 20th	Day	10% 12% 5% 10% 7% 3 9% 6% 4 6% 28%	2850
	21st to end	Day	15% 15% 7% 15% 7% 4 5% 4 4 5% 20%	3135
February	1st to 10th	Day	13% 11% 5% 9% 7% 4 5% 4 5% 6% 30%	1710
	11th to 20th	Day	12% 10% 4 8% 6% 4 5% 4 6% 6% 35%	1655
	21st to end	Day	16% 10% 3 7% 5% 3 4 4 5% 7% 36%	1461
March	1st to 10th	Day	14% 10% 5% 9% 5% 3 4 4 4 5% 37%	1980
	11th to 20th	Day	13% 12% 5% 8% 6% 3 4 4 5% 7% 35%	1980
	21st to end	Day	21% 14% 5% 6% 6% 3 5% 4 4 5% 28%	2178
April	1st to 10th	Day	16% 9% 4 6% 5% 3 4 4 5% 7% 38%	2144
	11th to 20th	Day	16% 9% 3 6% 5% 3 4 5% 5% 6% 38%	2134
	21st to end	Day	22% 7% 3 7% 5% 3 3 4 4 6% 36%	2250
May	1st to 10th	Day	18% 7% 3 7% 6% 3 5% 5% 5% 8% 34%	2340
	11th to 20th	Day	17% 9% 3 5% 7% 3 5% 5% 5% 6% 35%	2388
	21st to end	Day	16% 6% 3 7% 6% 3 5% 5% 5% 7% 36%	2725
June	1st to 10th	Day	8% 5% 3 5% 5% 3 5% 6% 7% 9% 43%	2520
	11th to 20th	Day	7% 5% 2 5% 4 3 5% 5% 7% 9% 48%	2520
	21st to end	Day	10% 5% 2 5% 6% 4 5% 5% 6% 8% 44%	2520
July	1st to 10th	Day	7% 4 2 4 5% 3 5% 5% 7% 10% 48%	2520
	11th to 20th	Day	7% 4 1 5% 5% 3 5% 5% 6% 8% 50%	2429
	21st to end	Day	7% 4 2 4 5% 3 5% 5% 7% 10% 49%	2546
August	1st to 10th	Day	8% 5% 2 5% 6% 4 6% 6% 6% 11% 42%	2328
	11th to 20th	Day	11% 5% 2 4 4 3 5% 5% 6% 10% 46%	2301
	21st to end	Day	9% 4 2 5% 6% 3 4 4 5% 7% 52%	2399
September	1st to 10th	Day	14% 4 2 4 4 2 3 3 5% 7% 52%	2160
	11th to 20th	Day	10% 3 2 5% 4 2 4 5% 5% 9% 51%	2101
	21st to end	Day	11% 4 2 4 4 3 4 4 5% 7% 52%	1912
October	1st to 10th	Day	14% 6% 2 6% 5% 2 4 3 4 6% 47%	1800
	11th to 20th	Day	15% 8% 3 4 3 2 3 3 4 6% 48%	1800
	21st to end	Day	15% 8% 3 5% 4 3 4 5% 4 6% 43%	1980
November	1st to 10th	Day	10% 6% 3 3 5% 3 4 5% 4 7% 51%	1797
	11th to 20th	Day	13% 8% 3 7% 5% 2 3 4 4 7% 45%	1539
	21st to end	Day	16% 11% 4 5% 5% 2 2 3 4 7% 40%	1520
December	1st to 10th	Day	12% 10% 4 8% 6% 4 5% 4 3 7% 37%	1520
	11th to 20th	Day	10% 10% 4 9% 7% 4 4 4 5% 8% 34%	1918
	21st to end	Day	20% 13% 9% 13% 6% 3 4 4 4 5% 20%	2783
January	1st to 10th	Night	10% 10% 5% 17% 8% 4 4 4 4 5% 29%	4329
	11th to 20th	Night	11% 12% 6% 9% 6% 3 7% 5% 7% 5% 28%	4120
	21st to end	Night	14% 15% 7% 11% 6% 3 4 3 4 6% 26%	4532
February	1st to 10th	Night	13% 10% 5% 9% 6% 4 5% 4 5% 6% 34%	2470
	11th to 20th	Night	11% 9% 4 7% 6% 3 4 4 4 6% 42%	2397
	21st to end	Night	13% 10% 4 6% 4 3 4 5% 3 5% 41%	1808
March	1st to 10th	Night	11% 8% 3 6% 5% 3 3 4 4 5% 48%	1980
	11th to 20th	Night	16% 10% 3 5% 5% 3 4 4 4 6% 39%	1980
	21st to end	Night	21% 11% 4 8% 6% 4 5% 4 5% 5% 26%	2178
April	1st to 10th	Night	12% 6% 2 5% 6% 2 4 4 5% 6% 47%	1814
	11th to 20th	Night	15% 8% 3 6% 6% 3 4 4 4 6% 42%	1775
	21st to end	Night	17% 8% 3 5% 5% 3 4 3 5% 7% 40%	1708
May	1st to 10th	Night	15% 6% 3 5% 5% 4 5% 5% 6% 7% 38%	1620
	11th to 20th	Night	14% 6% 2 5% 5% 3 5% 5% 5% 7% 43%	1506
	21st to end	Night	11% 5% 3 5% 5% 4 5% 6% 5% 8% 45%	1551
June	1st to 10th	Night	7% 3 2 4 4 2 4 6% 8% 9% 52%	1440
	11th to 20th	Night	6% 5% 2 4 5% 2 5% 4 7% 11% 50%	1440
	21st to end	Night	6% 3 3 5% 4 3 4 6% 6% 8% 52%	1440
July	1st to 10th	Night	6% 3 2 4 3 3 5% 4 5% 9% 58%	1440
	11th to 20th	Night	4 2 1 4 5% 2 3 4 5% 10% 60%	1527
	21st to end	Night	6% 3 2 3 4 3 4 5% 6% 10% 53%	1772
August	1st to 10th	Night	4 3 1 5% 5% 3 5% 6% 8% 12% 49%	1611
	11th to 20th	Night	7% 4 3 4 4 3 4 4 6% 8% 54%	1600
	21st to end	Night	6% 3 1 3 3 2 4 5% 5% 7% 60%	1955
September	1st to 10th	Night	10% 4 2 4 4 2 3 4 5% 5% 56%	1800
	11th to 20th	Night	10% 4 2 4 4 3 3 4 5% 7% 53%	1857
	21st to end	Night	8% 4 2 4 4 2 3 4 5% 6% 57%	2029
October	1st to 10th	Night	14% 6% 3 4 4 2 3 3 4 6% 51%	2160
	11th to 20th	Night	14% 6% 2 4 4 3 3 3 4 5% 51%	2160
	21st to end	Night	16% 7% 2 5% 4 3 4 3 3 5% 47%	2376
November	1st to 10th	Night	8% 4 2 4 4 2 3 4 6% 8% 57%	2281
	11th to 20th	Night	11% 6% 4 5% 4 2 3 3 4 7% 49%	2638
	21st to end	Night	16% 10% 3 5% 4 2 3 3 4 5% 44%	2660
December	1st to 10th	Night	11% 11% 3 6% 6% 3 3 4 4 7% 40%	2660
	11th to 20th	Night	12% 10% 4 8% 6% 2 3 4 4 6% 42%	3279
	21st to end	Night	19% 15% 8% 11% 6% 3 4 3 3 4 24%	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	46% 26% 11% 12% 4 1	2624
	11th to 20th	Day	44% 25% 10% 15% 6%	2850
	21st to end	Day	57% 23% 7% 9% 3	3135
February	1st to 10th	Day	33% 35% 9% 13% 7% 2	1710
	11th to 20th	Day	32% 35% 8% 17% 7% 1	1664
	21st to end	Day	31% 36% 11% 17% 5%	1461
March	1st to 10th	Day	32% 36% 7% 16% 8%	1980
	11th to 20th	Day	35% 37% 8% 14% 6% 1	1980
	21st to end	Day	38% 38% 9% 11% 4 1	2178
April	1st to 10th	Day	29% 37% 7% 19% 7%	2144
	11th to 20th	Day	31% 36% 6% 17% 9% 1	2134
	21st to end	Day	32% 37% 9% 15% 7%	2250
May	1st to 10th	Day	33% 38% 8% 13% 7% 1	2340
	11th to 20th	Day	31% 38% 8% 15% 8%	2392
	21st to end	Day	33% 39% 7% 14% 7% 1	2725
June	1st to 10th	Day	26% 40% 10% 18% 6%	2520
	11th to 20th	Day	21% 39% 10% 16% 14% 1	2520
	21st to end	Day	25% 38% 8% 16% 11% 2	2520
July	1st to 10th	Day	20% 40% 11% 18% 8% 2	2451
	11th to 20th	Day	22% 38% 9% 17% 11% 3	2355
	21st to end	Day	21% 38% 9% 22% 10% 1	2405
August	1st to 10th	Day	22% 40% 10% 17% 10% 1	2314
	11th to 20th	Day	21% 37% 10% 20% 11% 1	2301
	21st to end	Day	17% 36% 7% 20% 15% 5%	2399
September	1st to 10th	Day	22% 36% 7% 17% 15% 4	2160
	11th to 20th	Day	21% 38% 7% 20% 13% 2	2101
	21st to end	Day	20% 37% 7% 21% 14% 1	1912
October	1st to 10th	Day	20% 36% 6% 21% 15% 2	1800
	11th to 20th	Day	29% 35% 6% 17% 11% 2	1800
	21st to end	Day	28% 38% 7% 14% 11% 2	1980
November	1st to 10th	Day	19% 41% 9% 17% 12% 2	1797
	11th to 20th	Day	26% 39% 8% 16% 10% 1	1539
	21st to end	Day	28% 39% 9% 15% 8%	1520
December	1st to 10th	Day	30% 39% 10% 15% 7%	1520
	11th to 20th	Day	32% 32% 12% 22% 3	1915
	21st to end	Day	54% 26% 7% 10% 3	2783
January	1st to 10th	Night	46% 26% 8% 15% 5%	4329
	11th to 20th	Night	44% 24% 9% 12% 10% 1	4120
	21st to end	Night	52% 22% 10% 11% 4 1	4532
February	1st to 10th	Night	34% 34% 6% 14% 9% 2	2470
	11th to 20th	Night	28% 35% 8% 17% 10% 2	2398
	21st to end	Night	29% 36% 7% 16% 9% 2	1808
March	1st to 10th	Night	26% 36% 8% 20% 10% 1	1980
	11th to 20th	Night	31% 37% 8% 15% 8% 1	1980
	21st to end	Night	40% 38% 8% 8% 5% 1	2178
April	1st to 10th	Night	24% 36% 8% 18% 12% 2	1814
	11th to 20th	Night	30% 36% 5% 17% 10% 3	1775
	21st to end	Night	30% 37% 8% 17% 9%	1708
May	1st to 10th	Night	28% 38% 8% 16% 8% 2	1620
	11th to 20th	Night	27% 38% 8% 14% 11% 1	1507
	21st to end	Night	25% 40% 8% 18% 7% 2	1552
June	1st to 10th	Night	19% 40% 14% 17% 8% 2	1440
	11th to 20th	Night	19% 39% 10% 16% 14% 3	1440
	21st to end	Night	20% 37% 10% 15% 15% 3	1440
July	1st to 10th	Night	16% 39% 10% 21% 11% 3	1400
	11th to 20th	Night	15% 38% 10% 21% 13% 2	1479
	21st to end	Night	18% 40% 8% 21% 12% 2	1673
August	1st to 10th	Night	17% 40% 11% 19% 11% 2	1601
	11th to 20th	Night	19% 37% 7% 21% 14% 1	1600
	21st to end	Night	13% 36% 8% 19% 17% 7%	1955
September	1st to 10th	Night	17% 36% 5% 19% 17% 6%	1800
	11th to 20th	Night	23% 37% 6% 18% 15% 1	1857
	21st to end	Night	17% 36% 7% 21% 16% 2	2029
October	1st to 10th	Night	16% 36% 8% 19% 18% 4	2160
	11th to 20th	Night	27% 37% 7% 15% 12% 3	2160
	21st to end	Night	29% 37% 6% 15% 13% 1	2376
November	1st to 10th	Night	15% 41% 11% 16% 13% 3	2281
	11th to 20th	Night	23% 39% 7% 20% 9% 2	2638
	21st to end	Night	27% 39% 6% 17% 10% 2	2660
December	1st to 10th	Night	29% 39% 9% 17% 6% 1	2660
	11th to 20th	Night	31% 32% 8% 22% 6%	3281
	21st to end	Night	54% 25% 6% 11% 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	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% 18% 34% 20% 8% 1	267
	21st to end	Day	21% 16% 43% 17% 3	198
March	1st to 10th	Day	18% 19% 43% 16% 3	240
	11th to 20th	Day	23% 13% 37% 23% 5%	240
	21st to end	Day	40% 17% 25% 14% 5%	264
April	1st to 10th	Day	25% 14% 34% 20% 6% 1	404
	11th to 20th	Day	21% 15% 33% 23% 8% 1	412
	21st to end	Day	23% 15% 35% 19% 7% 1	510
May	1st to 10th	Day	21% 14% 33% 23% 7% 2	603
	11th to 20th	Day	21% 10% 30% 25% 10% 3	625
	21st to end	Day	17% 11% 23% 27% 17% 4	679
June	1st to 10th	Day	9% 4 21% 33% 27% 7%	630
	11th to 20th	Day	9% 4 26% 38% 20% 4	630
	21st to end	Day	10% 8% 32% 31% 15% 3	630
July	1st to 10th	Day	8% 3 18% 32% 26% 13%	621
	11th to 20th	Day	8% 4 23% 37% 21% 6%	618
	21st to end	Day	7% 2 20% 40% 27% 4	684
August	1st to 10th	Day	7% 3 18% 39% 27% 6%	626
	11th to 20th	Day	11% 4 17% 37% 26% 6%	615
	21st to end	Day	9% 2 18% 35% 28% 8%	518
September	1st to 10th	Day	15% 4 21% 29% 24% 8%	450
	11th to 20th	Day	7% 3 25% 33% 24% 7%	391
	21st to end	Day	13% 7% 29% 27% 18% 6%	270
October	1st to 10th	Day	20% 7% 30% 24% 12% 7%	270
	11th to 20th	Day	13% 24% 36% 19% 8% 1	270
	21st to end	Day	23% 15% 29% 22% 10% 2	297
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% 41% 25% 5%	927
	21st to end	Night	20% 14% 41% 20% 4 1	624
March	1st to 10th	Night	15% 13% 40% 24% 7%	540
	11th to 20th	Night	21% 11% 35% 26% 7%	540
	21st to end	Night	26% 11% 37% 21% 5%	594
April	1st to 10th	Night	15% 15% 41% 24% 4	540
	11th to 20th	Night	20% 14% 36% 24% 6%	533
	21st to end	Night	20% 9% 38% 24% 8% 1	540
May	1st to 10th	Night	17% 8% 35% 33% 7%	540
	11th to 20th	Night	17% 8% 31% 33% 12%	531
	21st to end	Night	14% 4 28% 37% 17%	584
June	1st to 10th	Night	8% 3 24% 41% 22% 2	540
	11th to 20th	Night	8% 5% 26% 40% 19% 1	540
	21st to end	Night	7% 2 32% 41% 17%	540
July	1st to 10th	Night	6% 2 16% 38% 35% 3	525
	11th to 20th	Night	5% 2 20% 44% 26% 3	522
	21st to end	Night	6% 1 17% 47% 28% 1	591
August	1st to 10th	Night	3 1 20% 49% 25% 3	537
	11th to 20th	Night	7% 3 17% 40% 31% 3	534
	21st to end	Night	8% 2 15% 41% 30% 3	594
September	1st to 10th	Night	13% 3 19% 37% 25% 4	540
	11th to 20th	Night	13% 2 23% 36% 25% 2	540
	21st to end	Night	9% 6% 26% 37% 21% 1	589
October	1st to 10th	Night	17% 6% 29% 32% 14% 2	720
	11th to 20th	Night	17% 9% 40% 26% 8%	720
	21st to end	Night	21% 10% 37% 24% 7%	792
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

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