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 2024-11-03.

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 8% 5% 5% 5% 4 6% 7% 32%	101074
	Night	16% 11% 4 8% 5% 4 4 3 5% 6% 33%	97854
Transparency	Day	50% 7% 11% 20% 11% 1	100886
	Night	51% 6% 10% 20% 11% 2	97712
Seeing	Day	21% 14% 27% 21% 13% 5%	14740
	Night	21% 12% 26% 28% 12% 1	24447

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	20% 19% 7% 11% 5% 3 4 2 4 5% 20%	2836
	11th to 20th	Day	14% 22% 8% 16% 7% 5% 3 1 3 4 18%	2840
	21st to end	Day	24% 21% 6% 13% 6% 4 4 3 2 4 14%	3124
February	1st to 10th	Day	21% 16% 5% 9% 7% 4 4 3 4 5% 23%	1710
	11th to 20th	Day	16% 16% 7% 11% 5% 4 4 3 5% 6% 23%	1663
	21st to end	Day	21% 15% 4 10% 5% 4 3 4 4 5% 26%	1582
March	1st to 10th	Day	20% 14% 4 9% 4 4 4 3 5% 5% 29%	3435
	11th to 20th	Day	14% 9% 4 9% 6% 6% 5% 3 5% 5% 33%	3480
	21st to end	Day	18% 10% 3 8% 5% 5% 4 4 5% 6% 31%	3815
April	1st to 10th	Day	15% 12% 3 9% 6% 4 5% 4 6% 7% 29%	2190
	11th to 20th	Day	15% 10% 4 8% 5% 4 4 3 5% 6% 35%	2278
	21st to end	Day	20% 10% 2 7% 5% 4 4 3 5% 6% 33%	2470
May	1st to 10th	Day	23% 9% 3 7% 5% 5% 5% 3 6% 6% 28%	4082
	11th to 20th	Day	18% 9% 3 7% 5% 5% 4 4 6% 8% 30%	4081
	21st to end	Day	11% 6% 3 7% 5% 5% 5% 4 8% 9% 37%	4692
June	1st to 10th	Day	13% 7% 3 6% 5% 5% 6% 5% 7% 9% 34%	2660
	11th to 20th	Day	12% 6% 2 7% 6% 5% 6% 5% 7% 9% 35%	2660
	21st to end	Day	12% 6% 3 6% 5% 5% 5% 4 6% 10% 36%	2660
July	1st to 10th	Day	9% 6% 2 7% 5% 5% 6% 5% 6% 8% 40%	4256
	11th to 20th	Day	10% 6% 3 6% 5% 5% 5% 5% 7% 10% 38%	4120
	21st to end	Day	12% 7% 3 8% 5% 5% 6% 4 6% 9% 34%	4466
August	1st to 10th	Day	13% 8% 4 8% 6% 5% 7% 5% 7% 8% 30%	4104
	11th to 20th	Day	10% 7% 2 7% 5% 5% 6% 5% 7% 9% 37%	4044
	21st to end	Day	7% 4 2 7% 5% 5% 6% 6% 8% 10% 40%	4308
September	1st to 10th	Day	14% 6% 2 5% 4 4 4 4 6% 6% 45%	2280
	11th to 20th	Day	12% 6% 2 6% 4 4 4 4 5% 8% 45%	2095
	21st to end	Day	20% 9% 3 7% 4 4 4 3 4 6% 36%	2088
October	1st to 10th	Day	16% 7% 2 6% 5% 4 4 4 5% 8% 40%	1900
	11th to 20th	Day	17% 9% 3 7% 4 5% 4 3 5% 6% 37%	1900
	21st to end	Day	21% 10% 3 8% 4 4 3 3 5% 6% 36%	2090
November	1st to 10th	Day	12% 8% 3 7% 4 4 4 4 5% 6% 43%	1813
	11th to 20th	Day	16% 13% 4 8% 4 5% 5% 4 4 6% 31%	1598
	21st to end	Day	18% 13% 5% 8% 5% 4 3 5% 5% 5% 28%	1520
December	1st to 10th	Day	21% 17% 6% 11% 6% 5% 4 3 4 4 19%	1520
	11th to 20th	Day	20% 16% 6% 10% 5% 3 3 3 5% 6% 21%	1910
	21st to end	Day	22% 22% 7% 11% 5% 3 3 3 5% 4 15%	2804
January	1st to 10th	Night	16% 19% 7% 13% 6% 4 4 3 4 4 20%	4109
	11th to 20th	Night	18% 18% 7% 13% 6% 6% 4 3 3 4 17%	4120
	21st to end	Night	26% 16% 6% 13% 6% 4 3 2 3 3 18%	4532
February	1st to 10th	Night	19% 14% 4 10% 6% 4 4 3 5% 5% 26%	2470
	11th to 20th	Night	19% 13% 4 10% 6% 4 4 3 5% 5% 26%	2403
	21st to end	Night	20% 13% 5% 11% 5% 3 5% 3 5% 4 25%	1866
March	1st to 10th	Night	23% 10% 3 7% 4 3 3 3 4 5% 33%	3418
	11th to 20th	Night	14% 11% 5% 9% 5% 4 3 3 4 6% 36%	3480
	21st to end	Night	17% 9% 3 7% 4 4 4 3 5% 6% 39%	3817
April	1st to 10th	Night	17% 12% 3 7% 5% 5% 4 3 4 6% 34%	1990
	11th to 20th	Night	16% 8% 3 6% 5% 3 5% 4 5% 7% 38%	1868
	21st to end	Night	15% 10% 3 7% 4 3 5% 4 5% 7% 38%	1710
May	1st to 10th	Night	23% 11% 4 9% 5% 4 3 4 6% 6% 25%	2813
	11th to 20th	Night	16% 10% 3 7% 5% 4 4 3 4 7% 37%	2812
	21st to end	Night	10% 7% 3 7% 4 4 5% 4 8% 10% 38%	2858
June	1st to 10th	Night	10% 5% 2 7% 5% 4 4 3 5% 9% 44%	1520
	11th to 20th	Night	10% 6% 2 6% 5% 4 5% 4 8% 11% 40%	1520
	21st to end	Night	10% 5% 2 6% 5% 5% 5% 5% 6% 11% 41%	1520
July	1st to 10th	Night	10% 7% 3 7% 5% 5% 4 3 5% 8% 42%	2698
	11th to 20th	Night	10% 6% 2 7% 5% 5% 5% 4 6% 9% 42%	2840
	21st to end	Night	9% 8% 3 8% 5% 6% 6% 4 6% 8% 38%	3087
August	1st to 10th	Night	12% 8% 3 8% 5% 5% 6% 5% 7% 9% 33%	2825
	11th to 20th	Night	10% 8% 3 7% 5% 5% 5% 4 5% 7% 42%	2785
	21st to end	Night	8% 6% 2 6% 4 5% 5% 4 7% 8% 44%	3315
September	1st to 10th	Night	12% 4 3 5% 4 4 4 3 5% 7% 49%	1900
	11th to 20th	Night	10% 5% 2 4 3 4 5% 3 6% 7% 52%	2081
	21st to end	Night	16% 8% 2 6% 4 4 4 3 4 6% 42%	2090
October	1st to 10th	Night	14% 6% 2 6% 5% 5% 4 3 4 7% 45%	2280
	11th to 20th	Night	16% 7% 2 7% 4 4 5% 4 5% 6% 39%	2280
	21st to end	Night	21% 8% 3 6% 4 4 3 3 4 6% 38%	2508
November	1st to 10th	Night	12% 7% 3 7% 4 4 3 3 4 6% 47%	2307
	11th to 20th	Night	17% 11% 3 8% 4 5% 4 4 6% 6% 33%	2579
	21st to end	Night	19% 13% 4 8% 4 4 4 4 4 5% 31%	2660
December	1st to 10th	Night	22% 17% 6% 9% 5% 3 3 4 4 5% 22%	2660
	11th to 20th	Night	18% 17% 5% 11% 5% 4 4 3 4 5% 24%	3285
	21st to end	Night	22% 18% 5% 11% 6% 5% 5% 3 4 6% 16%	4848

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	68% 5% 11% 12% 4	2837
	11th to 20th	Day	73% 3 8% 11% 5% 1	2840
	21st to end	Day	75% 5% 6% 11% 3	3124
February	1st to 10th	Day	65% 4 10% 13% 7% 1	1710
	11th to 20th	Day	62% 5% 10% 16% 7%	1672
	21st to end	Day	62% 3 11% 15% 7% 2	1582
March	1st to 10th	Day	56% 4 10% 22% 7%	3435
	11th to 20th	Day	51% 6% 10% 24% 8% 1	3480
	21st to end	Day	52% 6% 9% 21% 11% 1	3815
April	1st to 10th	Day	53% 5% 10% 18% 10% 2	2190
	11th to 20th	Day	49% 6% 11% 15% 16% 3	2278
	21st to end	Day	51% 6% 10% 21% 11% 2	2470
May	1st to 10th	Day	55% 7% 9% 20% 8% 1	4120
	11th to 20th	Day	50% 9% 9% 23% 8% 1	4085
	21st to end	Day	39% 10% 15% 22% 12% 3	4706
June	1st to 10th	Day	43% 9% 13% 22% 11% 1	2660
	11th to 20th	Day	43% 9% 12% 23% 12% 1	2660
	21st to end	Day	42% 8% 13% 24% 13% 1	2660
July	1st to 10th	Day	40% 8% 12% 23% 15% 2	4191
	11th to 20th	Day	38% 8% 12% 26% 15% 1	4051
	21st to end	Day	45% 7% 10% 20% 16% 1	4324
August	1st to 10th	Day	47% 10% 13% 21% 9%	4091
	11th to 20th	Day	39% 9% 12% 27% 13%	4083
	21st to end	Day	34% 11% 13% 26% 14% 2	4308
September	1st to 10th	Day	38% 8% 11% 20% 20% 4	2280
	11th to 20th	Day	36% 7% 13% 28% 15% 2	2095
	21st to end	Day	50% 5% 11% 20% 14% 1	2088
October	1st to 10th	Day	42% 6% 13% 22% 16% 1	1900
	11th to 20th	Day	47% 5% 12% 24% 11% 1	1900
	21st to end	Day	50% 4 10% 21% 13% 1	2090
November	1st to 10th	Day	42% 5% 11% 22% 16% 3	1813
	11th to 20th	Day	53% 5% 9% 19% 12% 2	1598
	21st to end	Day	57% 6% 11% 18% 8% 1	1520
December	1st to 10th	Day	69% 5% 9% 13% 4	1520
	11th to 20th	Day	64% 5% 10% 16% 5%	1906
	21st to end	Day	72% 4 10% 10% 3	2804
January	1st to 10th	Night	67% 5% 10% 13% 4	4109
	11th to 20th	Night	71% 4 11% 11% 3	4120
	21st to end	Night	73% 4 6% 13% 3 1	4532
February	1st to 10th	Night	61% 5% 9% 18% 7%	2470
	11th to 20th	Night	61% 4 10% 17% 8%	2405
	21st to end	Night	61% 5% 9% 15% 8% 2	1866
March	1st to 10th	Night	53% 5% 9% 24% 8% 1	3418
	11th to 20th	Night	49% 6% 11% 27% 7% 1	3480
	21st to end	Night	46% 5% 9% 24% 14% 2	3817
April	1st to 10th	Night	51% 5% 9% 18% 13% 2	1990
	11th to 20th	Night	44% 6% 11% 18% 16% 4	1868
	21st to end	Night	44% 6% 11% 23% 11% 4	1710
May	1st to 10th	Night	57% 7% 8% 16% 10% 2	2840
	11th to 20th	Night	47% 9% 10% 23% 9% 1	2813
	21st to end	Night	38% 10% 15% 22% 11% 4	2865
June	1st to 10th	Night	38% 8% 12% 25% 16% 2	1520
	11th to 20th	Night	38% 9% 12% 25% 14% 2	1520
	21st to end	Night	36% 10% 13% 24% 16% 2	1520
July	1st to 10th	Night	40% 7% 9% 23% 16% 4	2653
	11th to 20th	Night	36% 8% 15% 24% 15% 1	2786
	21st to end	Night	42% 9% 11% 17% 18% 3	2988
August	1st to 10th	Night	45% 10% 13% 22% 10%	2814
	11th to 20th	Night	40% 8% 9% 25% 17% 1	2812
	21st to end	Night	34% 9% 12% 30% 12% 2	3315
September	1st to 10th	Night	35% 7% 10% 23% 20% 5%	1900
	11th to 20th	Night	31% 6% 13% 26% 23% 1	2081
	21st to end	Night	43% 6% 11% 21% 18% 1	2090
October	1st to 10th	Night	40% 7% 11% 25% 14% 3	2280
	11th to 20th	Night	44% 5% 10% 24% 14% 2	2280
	21st to end	Night	48% 4 10% 22% 14% 2	2508
November	1st to 10th	Night	40% 5% 10% 22% 18% 4	2307
	11th to 20th	Night	51% 5% 10% 19% 12% 2	2579
	21st to end	Night	55% 5% 9% 21% 8% 1	2660
December	1st to 10th	Night	64% 6% 10% 15% 5% 1	2660
	11th to 20th	Night	63% 4 11% 17% 4	3288
	21st to end	Night	70% 5% 10% 12% 3	4848

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	29% 27% 26% 12% 5% 1	270
	11th to 20th	Day	35% 28% 26% 8% 2	270
	21st to end	Day	28% 32% 28% 8% 3 1	297
February	1st to 10th	Day	32% 26% 30% 11% 1	270
	11th to 20th	Day	34% 31% 27% 6% 1	270
	21st to end	Day	37% 22% 32% 8% 1	260
March	1st to 10th	Day	27% 23% 29% 17% 3	460
	11th to 20th	Day	31% 21% 30% 13% 4 1	460
	21st to end	Day	31% 17% 28% 18% 5% 1	506
April	1st to 10th	Day	28% 19% 27% 18% 7% 1	460
	11th to 20th	Day	22% 20% 30% 14% 10% 4	452
	21st to end	Day	26% 19% 29% 17% 7% 2	460
May	1st to 10th	Day	25% 18% 28% 16% 9% 3	463
	11th to 20th	Day	21% 14% 29% 20% 11% 6%	487
	21st to end	Day	14% 9% 26% 26% 18% 7%	529
June	1st to 10th	Day	15% 9% 30% 27% 16% 3	490
	11th to 20th	Day	15% 9% 27% 25% 19% 4	490
	21st to end	Day	14% 11% 28% 27% 16% 4	490
July	1st to 10th	Day	12% 7% 23% 26% 20% 12%	485
	11th to 20th	Day	11% 7% 24% 30% 19% 9%	484
	21st to end	Day	14% 7% 25% 28% 19% 8%	532
August	1st to 10th	Day	12% 6% 23% 27% 23% 10%	486
	11th to 20th	Day	16% 5% 19% 27% 22% 11%	479
	21st to end	Day	11% 4 23% 26% 23% 13%	539
September	1st to 10th	Day	16% 6% 22% 27% 19% 11%	490
	11th to 20th	Day	13% 4 16% 30% 25% 12%	490
	21st to end	Day	24% 11% 25% 21% 14% 6%	490
October	1st to 10th	Day	17% 9% 26% 23% 21% 5%	490
	11th to 20th	Day	21% 16% 27% 23% 10% 3	490
	21st to end	Day	25% 17% 29% 19% 9% 1	539
November	1st to 10th	Day	20% 16% 30% 22% 10% 4	399
	11th to 20th	Day	28% 19% 29% 14% 9% 1	216
	21st to end	Day	26% 18% 42% 11% 4	180
December	1st to 10th	Day	30% 24% 30% 10% 4 1	180
	11th to 20th	Day	31% 24% 28% 15% 2	180
	21st to end	Day	35% 25% 24% 11% 5%	207
January	1st to 10th	Night	29% 21% 30% 16% 3	760
	11th to 20th	Night	34% 15% 30% 17% 3	760
	21st to end	Night	29% 20% 29% 19% 3	836
February	1st to 10th	Night	28% 18% 27% 25% 2	760
	11th to 20th	Night	30% 20% 32% 16% 1	743
	21st to end	Night	30% 17% 32% 18% 3	628
March	1st to 10th	Night	25% 18% 30% 24% 4	760
	11th to 20th	Night	26% 18% 28% 21% 6% 1	760
	21st to end	Night	24% 14% 32% 24% 4 1	836
April	1st to 10th	Night	26% 16% 30% 23% 5%	760
	11th to 20th	Night	21% 13% 31% 25% 9% 1	744
	21st to end	Night	21% 9% 33% 30% 7%	570
May	1st to 10th	Night	21% 9% 24% 33% 13% 1	570
	11th to 20th	Night	20% 9% 26% 32% 12% 1	561
	21st to end	Night	10% 3 24% 36% 25% 2	486
June	1st to 10th	Night	10% 6% 24% 39% 21% 1	380
	11th to 20th	Night	12% 6% 22% 39% 20% 1	380
	21st to end	Night	11% 3 28% 35% 22% 1	380
July	1st to 10th	Night	11% 2 18% 40% 23% 6%	465
	11th to 20th	Night	9% 4 18% 38% 28% 4	552
	21st to end	Night	12% 4 16% 37% 30% 2	624
August	1st to 10th	Night	10% 2 18% 40% 29% 2	567
	11th to 20th	Night	10% 4 14% 37% 30% 4	564
	21st to end	Night	11% 4 16% 34% 29% 5%	740
September	1st to 10th	Night	15% 3 16% 36% 27% 4	760
	11th to 20th	Night	12% 5% 15% 35% 29% 4	760
	21st to end	Night	19% 7% 22% 29% 20% 3	760
October	1st to 10th	Night	17% 8% 21% 31% 21% 2	760
	11th to 20th	Night	20% 9% 29% 29% 11% 1	760
	21st to end	Night	25% 13% 25% 29% 8% 1	836
November	1st to 10th	Night	17% 11% 28% 31% 13% 1	749
	11th to 20th	Night	25% 14% 27% 25% 7% 1	760
	21st to end	Night	28% 14% 29% 23% 6% 1	760
December	1st to 10th	Night	33% 16% 28% 19% 5%	760
	11th to 20th	Night	27% 19% 29% 22% 4	760
	21st to end	Night	28% 16% 31% 23% 2	836

Page generated at 2024-10-31 03:39:25. Version ac07

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