Mingo Creek Park Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mingo Creek Park Observatory clear sky chart from 2005-11-06 to 2026-10-29.

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	15% 10% 4 9% 5% 5% 5% 4 6% 7% 31%	149128
	Night	15% 11% 4 9% 5% 5% 4 3 5% 6% 32%	142909
Transparency	Day	50% 7% 11% 20% 11% 1	152734
	Night	51% 6% 10% 19% 11% 2	147373
Seeing	Day	22% 15% 27% 20% 12% 4	17324
	Night	21% 12% 26% 28% 12% 1	27009

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	17% 18% 7% 19% 5% 4 4 2 4 4 15%	5258
	11th to 20th	Day	13% 20% 8% 17% 9% 6% 3 2 3 3 16%	5280
	21st to end	Day	18% 16% 5% 13% 8% 6% 4 3 4 5% 18%	5780
February	1st to 10th	Day	20% 16% 6% 9% 7% 4 4 3 4 5% 23%	1890
	11th to 20th	Day	17% 16% 6% 11% 5% 4 4 3 4 6% 23%	1843
	21st to end	Day	20% 14% 4 11% 5% 3 3 4 3 5% 26%	1744
March	1st to 10th	Day	16% 14% 4 10% 5% 4 4 3 5% 5% 31%	5045
	11th to 20th	Day	13% 9% 3 8% 6% 5% 5% 3 6% 6% 37%	5090
	21st to end	Day	16% 10% 4 10% 6% 5% 5% 4 5% 6% 31%	5586
April	1st to 10th	Day	16% 11% 3 9% 6% 4 5% 4 6% 7% 29%	2420
	11th to 20th	Day	14% 10% 3 8% 5% 5% 5% 3 6% 6% 35%	2520
	21st to end	Day	19% 10% 2 7% 5% 4 4 3 5% 6% 34%	2730
May	1st to 10th	Day	19% 9% 3 8% 5% 5% 6% 4 7% 6% 28%	7616
	11th to 20th	Day	16% 8% 3 8% 5% 5% 5% 4 7% 8% 32%	7626
	21st to end	Day	21% 7% 3 7% 4 5% 4 4 6% 7% 33%	8803
June	1st to 10th	Day	12% 7% 3 6% 5% 5% 6% 5% 7% 9% 36%	2940
	11th to 20th	Day	12% 6% 2 8% 6% 5% 5% 5% 7% 9% 34%	2940
	21st to end	Day	12% 6% 3 7% 5% 5% 5% 4 6% 10% 36%	2940
July	1st to 10th	Day	9% 7% 3 8% 5% 5% 6% 4 6% 8% 39%	7928
	11th to 20th	Day	9% 6% 3 7% 6% 5% 6% 5% 8% 11% 35%	7680
	21st to end	Day	11% 7% 3 8% 5% 5% 6% 4 7% 9% 36%	8340
August	1st to 10th	Day	15% 9% 4 9% 5% 5% 7% 4 7% 8% 27%	6014
	11th to 20th	Day	16% 9% 3 7% 5% 5% 5% 4 7% 9% 31%	5951
	21st to end	Day	6% 4 2 6% 5% 5% 6% 6% 8% 11% 41%	6265
September	1st to 10th	Day	13% 6% 2 5% 4 4 4 4 6% 7% 45%	2520
	11th to 20th	Day	12% 5% 2 6% 4 4 4 4 5% 8% 45%	2315
	21st to end	Day	21% 8% 3 7% 4 4 4 3 4 6% 34%	2308
October	1st to 10th	Day	15% 7% 2 6% 5% 3 4 4 4 7% 44%	2100
	11th to 20th	Day	17% 8% 3 6% 4 5% 4 3 5% 6% 38%	2100
	21st to end	Day	20% 10% 3 7% 4 3 3 3 5% 6% 37%	2280
November	1st to 10th	Day	12% 8% 3 7% 5% 4 4 4 5% 6% 43%	1985
	11th to 20th	Day	16% 13% 4 9% 4 5% 5% 4 5% 6% 31%	1766
	21st to end	Day	18% 14% 5% 9% 6% 4 3 4 5% 5% 27%	1680
December	1st to 10th	Day	17% 14% 6% 15% 6% 5% 4 3 4 4 21%	2680
	11th to 20th	Day	23% 16% 6% 10% 5% 3 3 2 4 5% 22%	3070
	21st to end	Day	20% 19% 6% 12% 6% 4 4 3 5% 4 16%	4095
January	1st to 10th	Night	15% 17% 6% 20% 7% 5% 5% 3 4 4 15%	7635
	11th to 20th	Night	15% 17% 8% 14% 8% 6% 4 3 3 4 18%	7680
	21st to end	Night	19% 14% 5% 12% 8% 6% 4 3 4 4 23%	8401
February	1st to 10th	Night	19% 14% 5% 10% 6% 4 4 3 5% 5% 26%	2730
	11th to 20th	Night	20% 13% 5% 10% 6% 5% 4 3 5% 5% 24%	2663
	21st to end	Night	19% 13% 5% 12% 5% 3 4 4 5% 5% 25%	2056
March	1st to 10th	Night	21% 10% 4 9% 5% 4 3 3 4 5% 33%	5028
	11th to 20th	Night	11% 8% 4 7% 5% 4 4 3 5% 6% 43%	5090
	21st to end	Night	16% 9% 3 8% 5% 4 4 4 5% 6% 35%	5588
April	1st to 10th	Night	18% 12% 3 7% 5% 5% 4 3 4 6% 33%	2200
	11th to 20th	Night	16% 8% 3 6% 5% 3 5% 4 6% 7% 37%	2067
	21st to end	Night	15% 10% 3 7% 4 3 4 4 5% 7% 38%	1890
May	1st to 10th	Night	20% 10% 4 9% 5% 4 4 4 5% 7% 27%	5237
	11th to 20th	Night	13% 8% 3 7% 5% 4 5% 4 5% 9% 37%	5234
	21st to end	Night	21% 8% 3 7% 5% 4 4 3 5% 7% 32%	5346
June	1st to 10th	Night	10% 5% 2 7% 5% 4 4 3 5% 9% 45%	1680
	11th to 20th	Night	10% 7% 2 6% 6% 4 5% 4 7% 10% 39%	1680
	21st to end	Night	10% 5% 2 6% 5% 5% 5% 5% 6% 11% 41%	1680
July	1st to 10th	Night	10% 8% 3 8% 5% 5% 4 3 5% 7% 40%	5010
	11th to 20th	Night	11% 7% 3 8% 5% 5% 5% 4 7% 9% 36%	5277
	21st to end	Night	10% 7% 3 7% 5% 5% 5% 4 6% 9% 39%	5736
August	1st to 10th	Night	14% 9% 4 9% 6% 6% 5% 4 6% 8% 29%	4135
	11th to 20th	Night	15% 9% 4 8% 5% 5% 5% 3 5% 6% 36%	4095
	21st to end	Night	7% 5% 2 7% 5% 6% 5% 5% 8% 8% 42%	4813
September	1st to 10th	Night	12% 4 2 6% 4 4 4 3 5% 7% 49%	2100
	11th to 20th	Night	10% 5% 2 5% 3 4 4 3 5% 7% 51%	2301
	21st to end	Night	17% 8% 2 7% 4 4 4 4 4 6% 39%	2310
October	1st to 10th	Night	13% 6% 2 6% 4 5% 4 3 4 7% 46%	2520
	11th to 20th	Night	16% 7% 2 7% 4 4 5% 4 5% 6% 40%	2520
	21st to end	Night	20% 8% 3 6% 4 4 4 3 4 6% 40%	2737
November	1st to 10th	Night	12% 7% 3 7% 4 4 3 3 4 6% 47%	2529
	11th to 20th	Night	18% 11% 3 8% 4 5% 4 4 5% 6% 32%	2851
	21st to end	Night	19% 14% 4 8% 5% 4 4 4 4 5% 30%	2940
December	1st to 10th	Night	18% 15% 9% 13% 5% 4 4 4 4 5% 19%	4720
	11th to 20th	Night	20% 16% 6% 10% 5% 4 4 3 4 5% 23%	5345
	21st to end	Night	20% 17% 5% 11% 6% 5% 5% 3 4 6% 18%	7085

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	72% 5% 9% 10% 3	5259
	11th to 20th	Day	74% 3 7% 8% 6% 2	5280
	21st to end	Day	68% 4 7% 15% 5%	5780
February	1st to 10th	Day	63% 5% 10% 14% 7% 1	1890
	11th to 20th	Day	63% 5% 9% 16% 7%	1852
	21st to end	Day	61% 4 11% 16% 7% 2	1744
March	1st to 10th	Day	54% 4 10% 23% 8% 1	5045
	11th to 20th	Day	47% 5% 11% 27% 9% 2	5090
	21st to end	Day	53% 6% 8% 20% 12% 1	5586
April	1st to 10th	Day	53% 5% 10% 18% 11% 2	2420
	11th to 20th	Day	48% 6% 12% 16% 16% 2	2520
	21st to end	Day	50% 6% 10% 22% 11% 2	2730
May	1st to 10th	Day	52% 8% 10% 20% 7% 2	7651
	11th to 20th	Day	47% 8% 10% 24% 10% 1	7630
	21st to end	Day	49% 8% 10% 17% 15% 2	8818
June	1st to 10th	Day	42% 9% 13% 22% 13% 1	2940
	11th to 20th	Day	44% 9% 12% 23% 12% 1	2940
	21st to end	Day	42% 8% 12% 23% 13% 1	2940
July	1st to 10th	Day	41% 8% 11% 24% 14% 1	7863
	11th to 20th	Day	40% 8% 12% 29% 10%	7611
	21st to end	Day	42% 8% 10% 22% 18% 1	8156
August	1st to 10th	Day	51% 9% 11% 17% 10% 1	6001
	11th to 20th	Day	46% 8% 12% 23% 10%	5990
	21st to end	Day	31% 11% 17% 27% 13% 1	6265
September	1st to 10th	Day	37% 7% 11% 21% 20% 3	2520
	11th to 20th	Day	36% 7% 13% 27% 16% 2	2315
	21st to end	Day	51% 5% 10% 19% 14% 1	2308
October	1st to 10th	Day	33% 5% 10% 30% 21% 1	3360
	11th to 20th	Day	42% 6% 11% 22% 14% 5%	3340
	21st to end	Day	36% 4 11% 28% 20% 2	3618
November	1st to 10th	Day	42% 5% 11% 22% 17% 3	1985
	11th to 20th	Day	54% 5% 9% 19% 12% 2	1766
	21st to end	Day	58% 6% 11% 17% 7% 1	1680
December	1st to 10th	Day	66% 6% 13% 12% 4	2680
	11th to 20th	Day	65% 4 10% 15% 5%	3066
	21st to end	Day	70% 5% 9% 12% 5%	4095
January	1st to 10th	Night	71% 6% 9% 10% 4	7636
	11th to 20th	Night	70% 4 7% 11% 6% 1	7680
	21st to end	Night	65% 4 9% 15% 6% 1	8401
February	1st to 10th	Night	61% 5% 9% 18% 7%	2730
	11th to 20th	Night	62% 4 10% 16% 7%	2665
	21st to end	Night	60% 6% 8% 16% 9% 1	2056
March	1st to 10th	Night	54% 5% 8% 23% 9% 1	5028
	11th to 20th	Night	41% 5% 12% 30% 9% 3	5090
	21st to end	Night	49% 5% 9% 20% 15% 2	5588
April	1st to 10th	Night	52% 5% 9% 19% 13% 2	2200
	11th to 20th	Night	45% 6% 12% 18% 15% 4	2067
	21st to end	Night	45% 6% 11% 24% 11% 3	1890
May	1st to 10th	Night	55% 8% 11% 14% 10% 2	5264
	11th to 20th	Night	44% 8% 10% 27% 10% 1	5235
	21st to end	Night	51% 7% 10% 18% 11% 2	5353
June	1st to 10th	Night	38% 8% 11% 24% 17% 2	1680
	11th to 20th	Night	40% 9% 12% 24% 14% 1	1680
	21st to end	Night	37% 9% 12% 24% 16% 1	1680
July	1st to 10th	Night	42% 8% 9% 21% 17% 2	4967
	11th to 20th	Night	41% 8% 15% 23% 12% 1	5226
	21st to end	Night	40% 9% 11% 18% 21% 2	5606
August	1st to 10th	Night	51% 9% 12% 18% 8% 2	4124
	11th to 20th	Night	48% 8% 10% 21% 13% 1	4122
	21st to end	Night	35% 9% 14% 29% 12% 2	4813
September	1st to 10th	Night	34% 7% 10% 23% 20% 5%	2100
	11th to 20th	Night	32% 6% 13% 27% 22% 1	2301
	21st to end	Night	45% 6% 10% 20% 17% 1	2310
October	1st to 10th	Night	35% 5% 8% 27% 23% 2	4040
	11th to 20th	Night	37% 5% 11% 24% 16% 8%	4019
	21st to end	Night	35% 3 9% 27% 24% 2	4349
November	1st to 10th	Night	39% 5% 10% 23% 19% 4	2529
	11th to 20th	Night	52% 5% 9% 19% 12% 2	2851
	21st to end	Night	56% 5% 9% 20% 8% 1	2940
December	1st to 10th	Night	67% 5% 9% 15% 3	4720
	11th to 20th	Night	64% 4 14% 14% 3	5348
	21st to end	Night	67% 5% 11% 14% 3	7085

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	31% 29% 24% 12% 4 1	330
	11th to 20th	Day	40% 28% 24% 7% 2	330
	21st to end	Day	30% 33% 26% 8% 2 1	363
February	1st to 10th	Day	30% 28% 29% 10% 2	330
	11th to 20th	Day	37% 29% 26% 6% 1	330
	21st to end	Day	33% 22% 36% 7% 1	312
March	1st to 10th	Day	28% 23% 29% 16% 3	540
	11th to 20th	Day	32% 22% 29% 12% 4 1	540
	21st to end	Day	31% 20% 28% 17% 4 1	594
April	1st to 10th	Day	30% 19% 27% 17% 6% 1	540
	11th to 20th	Day	24% 22% 29% 14% 9% 3	532
	21st to end	Day	25% 19% 30% 17% 8% 2	540
May	1st to 10th	Day	26% 20% 28% 15% 8% 2	543
	11th to 20th	Day	21% 15% 30% 19% 10% 5%	567
	21st to end	Day	18% 11% 26% 24% 16% 6%	617
June	1st to 10th	Day	14% 10% 32% 26% 16% 3	570
	11th to 20th	Day	16% 12% 27% 24% 17% 3	570
	21st to end	Day	14% 11% 28% 26% 18% 4	570
July	1st to 10th	Day	12% 7% 21% 27% 22% 12%	565
	11th to 20th	Day	11% 7% 25% 31% 18% 9%	564
	21st to end	Day	14% 7% 24% 28% 20% 8%	620
August	1st to 10th	Day	11% 6% 24% 27% 22% 9%	566
	11th to 20th	Day	17% 5% 19% 27% 22% 10%	559
	21st to end	Day	10% 4 25% 27% 22% 12%	627
September	1st to 10th	Day	14% 8% 22% 27% 18% 11%	570
	11th to 20th	Day	12% 4 16% 31% 25% 12%	570
	21st to end	Day	25% 10% 25% 21% 15% 5%	570
October	1st to 10th	Day	16% 9% 26% 24% 20% 5%	570
	11th to 20th	Day	21% 16% 28% 22% 10% 3	570
	21st to end	Day	24% 18% 28% 19% 9% 2	615
November	1st to 10th	Day	21% 17% 31% 20% 9% 3	463
	11th to 20th	Day	30% 17% 32% 12% 8% 1	264
	21st to end	Day	31% 18% 37% 10% 3	220
December	1st to 10th	Day	29% 28% 29% 9% 4 1	220
	11th to 20th	Day	31% 26% 28% 14% 1	220
	21st to end	Day	37% 23% 24% 11% 5%	253
January	1st to 10th	Night	29% 22% 30% 16% 3	840
	11th to 20th	Night	33% 18% 30% 16% 3	840
	21st to end	Night	29% 21% 29% 19% 3	924
February	1st to 10th	Night	28% 18% 27% 25% 2	840
	11th to 20th	Night	30% 20% 32% 16% 1	823
	21st to end	Night	29% 18% 33% 18% 2	692
March	1st to 10th	Night	26% 18% 30% 23% 3	840
	11th to 20th	Night	26% 18% 28% 21% 6% 1	840
	21st to end	Night	24% 16% 32% 23% 4 1	924
April	1st to 10th	Night	26% 16% 30% 23% 4	840
	11th to 20th	Night	22% 14% 30% 25% 9% 1	823
	21st to end	Night	21% 9% 32% 30% 7%	630
May	1st to 10th	Night	21% 9% 25% 32% 12%	630
	11th to 20th	Night	20% 9% 27% 33% 11% 1	621
	21st to end	Night	13% 4 25% 33% 23% 2	538
June	1st to 10th	Night	10% 6% 24% 39% 20% 1	420
	11th to 20th	Night	11% 6% 23% 40% 18% 1	420
	21st to end	Night	11% 3 27% 34% 23% 1	420
July	1st to 10th	Night	10% 3 17% 39% 25% 6%	516
	11th to 20th	Night	10% 4 17% 37% 29% 3	612
	21st to end	Night	11% 3 17% 38% 29% 2	690
August	1st to 10th	Night	10% 2 17% 41% 28% 2	627
	11th to 20th	Night	10% 5% 14% 37% 30% 4	624
	21st to end	Night	11% 5% 16% 35% 29% 4	818
September	1st to 10th	Night	14% 3 16% 37% 26% 4	840
	11th to 20th	Night	12% 5% 14% 35% 29% 4	840
	21st to end	Night	20% 7% 22% 29% 20% 2	840
October	1st to 10th	Night	16% 7% 21% 32% 21% 3	840
	11th to 20th	Night	20% 9% 29% 29% 11% 2	840
	21st to end	Night	23% 13% 24% 30% 9% 1	913
November	1st to 10th	Night	17% 12% 29% 31% 12%	820
	11th to 20th	Night	27% 15% 27% 25% 6% 1	840
	21st to end	Night	29% 14% 29% 23% 5% 1	840
December	1st to 10th	Night	31% 16% 29% 19% 5%	840
	11th to 20th	Night	29% 18% 29% 21% 3	840
	21st to end	Night	28% 16% 31% 23% 2	924

Page generated at 2026-10-26 04:37:50. Version ac07

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