Town Creek Indian Mound
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Town Creek Indian Mound clear sky chart from 2005-11-06 to 2024-12-09.

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% 6% 2 6% 4 4 5% 4 6% 8% 42%	101488
	Night	14% 6% 2 6% 4 4 4 3 5% 7% 43%	98250
Transparency	Day	38% 7% 12% 19% 18% 6%	105138
	Night	38% 7% 11% 19% 19% 7%	102739
Seeing	Day	16% 11% 25% 25% 17% 6%	15547
	Night	16% 9% 24% 31% 18% 2	25648

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	18% 5% 2 4 3 3 3 2 3 6% 51%	2836
	11th to 20th	Day	13% 7% 2 5% 3 3 3 3 4 4 54%	2840
	21st to end	Day	19% 10% 3 6% 3 4 3 3 4 5% 41%	3124
February	1st to 10th	Day	15% 7% 2 5% 4 4 4 3 6% 7% 42%	1710
	11th to 20th	Day	21% 6% 2 4 3 3 3 3 3 5% 46%	1748
	21st to end	Day	19% 8% 2 6% 4 4 3 3 5% 6% 40%	1683
March	1st to 10th	Day	22% 8% 2 6% 4 3 4 3 5% 6% 37%	3435
	11th to 20th	Day	10% 4 2 5% 4 4 3 3 5% 7% 54%	3480
	21st to end	Day	20% 7% 2 5% 4 3 3 3 4 5% 43%	3815
April	1st to 10th	Day	11% 4 1 4 4 4 4 3 7% 7% 51%	2142
	11th to 20th	Day	12% 5% 2 6% 4 4 4 4 5% 7% 48%	2254
	21st to end	Day	12% 4 2 5% 4 5% 4 4 5% 8% 48%	2327
May	1st to 10th	Day	10% 8% 2 8% 6% 6% 6% 5% 6% 9% 35%	4082
	11th to 20th	Day	16% 7% 3 7% 5% 5% 5% 4 5% 6% 36%	4081
	21st to end	Day	6% 4 2 6% 4 5% 5% 4 6% 9% 47%	4476
June	1st to 10th	Day	9% 5% 2 6% 5% 6% 6% 4 8% 10% 38%	2470
	11th to 20th	Day	9% 5% 2 5% 6% 5% 5% 5% 7% 9% 42%	2470
	21st to end	Day	6% 5% 2 6% 6% 6% 6% 6% 9% 10% 39%	2470
July	1st to 10th	Day	9% 6% 2 8% 6% 6% 7% 5% 7% 11% 33%	4120
	11th to 20th	Day	10% 5% 2 7% 6% 7% 7% 6% 8% 12% 29%	4120
	21st to end	Day	13% 8% 3 8% 6% 7% 6% 6% 8% 10% 26%	4466
August	1st to 10th	Day	22% 7% 3 7% 5% 5% 6% 5% 8% 10% 21%	4104
	11th to 20th	Day	10% 6% 2 7% 6% 6% 7% 6% 8% 10% 33%	3994
	21st to end	Day	6% 4 2 5% 3 4 4 4 7% 11% 50%	4180
September	1st to 10th	Day	8% 5% 2 6% 5% 6% 5% 4 7% 9% 44%	2224
	11th to 20th	Day	13% 5% 2 7% 5% 5% 4 3 5% 8% 42%	2090
	21st to end	Day	18% 7% 2 7% 4 5% 4 3 6% 6% 39%	2090
October	1st to 10th	Day	14% 6% 2 5% 4 3 3 2 5% 6% 51%	1916
	11th to 20th	Day	11% 4 1 4 4 3 4 3 3 5% 58%	1900
	21st to end	Day	13% 4 2 4 3 3 3 3 3 5% 58%	2090
November	1st to 10th	Day	13% 5% 2 5% 3 3 3 3 4 5% 54%	1957
	11th to 20th	Day	15% 4 2 4 2 3 3 3 4 6% 53%	1935
	21st to end	Day	14% 5% 2 5% 4 3 4 3 5% 6% 49%	1800
December	1st to 10th	Day	18% 9% 2 5% 3 2 3 3 5% 7% 42%	1782
	11th to 20th	Day	17% 4 2 4 2 2 3 3 4 6% 54%	2153
	21st to end	Day	16% 7% 2 6% 4 4 4 3 4 6% 44%	3124
January	1st to 10th	Night	16% 7% 3 6% 4 3 3 3 4 5% 48%	4109
	11th to 20th	Night	13% 7% 2 6% 4 4 4 3 5% 6% 46%	4120
	21st to end	Night	19% 7% 2 6% 3 3 3 2 4 5% 45%	4532
February	1st to 10th	Night	16% 6% 3 6% 4 3 3 3 5% 6% 45%	2470
	11th to 20th	Night	20% 7% 2 5% 4 3 3 3 4 5% 43%	2315
	21st to end	Night	16% 7% 2 5% 3 3 4 3 6% 6% 45%	1770
March	1st to 10th	Night	24% 9% 3 7% 4 4 4 3 3 5% 34%	3418
	11th to 20th	Night	12% 5% 2 5% 4 4 4 3 5% 7% 51%	3480
	21st to end	Night	19% 4 2 5% 4 4 4 3 5% 5% 46%	3817
April	1st to 10th	Night	13% 5% 2 4 4 3 3 4 6% 6% 50%	2036
	11th to 20th	Night	12% 5% 2 5% 4 4 4 3 5% 6% 50%	1875
	21st to end	Night	12% 4 1 5% 5% 5% 4 4 5% 7% 49%	1869
May	1st to 10th	Night	13% 7% 3 7% 4 4 4 3 5% 8% 42%	2813
	11th to 20th	Night	16% 7% 3 7% 5% 4 4 3 5% 7% 37%	2812
	21st to end	Night	7% 4 2 6% 5% 5% 5% 4 7% 11% 44%	3079
June	1st to 10th	Night	10% 6% 2 7% 7% 5% 5% 6% 8% 9% 35%	1710
	11th to 20th	Night	9% 6% 2 7% 7% 6% 6% 5% 6% 8% 37%	1710
	21st to end	Night	8% 5% 3 7% 6% 5% 5% 5% 9% 12% 36%	1710
July	1st to 10th	Night	11% 6% 3 9% 6% 5% 6% 4 8% 10% 32%	2840
	11th to 20th	Night	12% 7% 3 8% 6% 6% 6% 4 8% 10% 31%	2840
	21st to end	Night	16% 9% 3 9% 6% 5% 6% 5% 6% 9% 25%	3087
August	1st to 10th	Night	23% 8% 3 7% 5% 5% 6% 4 6% 9% 25%	2825
	11th to 20th	Night	11% 5% 2 8% 6% 6% 6% 5% 8% 10% 34%	2800
	21st to end	Night	5% 4 1 5% 4 5% 4 4 7% 10% 51%	3476
September	1st to 10th	Night	9% 5% 2 5% 4 5% 5% 4 6% 8% 47%	1951
	11th to 20th	Night	13% 8% 3 7% 4 4 3 4 5% 7% 42%	2090
	21st to end	Night	17% 6% 2 7% 5% 5% 4 4 5% 7% 38%	2090
October	1st to 10th	Night	13% 6% 2 6% 4 3 4 3 4 6% 50%	2262
	11th to 20th	Night	12% 5% 2 4 3 3 3 3 4 5% 55%	2280
	21st to end	Night	11% 6% 2 5% 3 2 3 3 4 5% 57%	2508
November	1st to 10th	Night	13% 5% 2 5% 3 3 3 2 4 5% 53%	2341
	11th to 20th	Night	12% 6% 3 5% 4 3 3 2 5% 6% 51%	2460
	21st to end	Night	14% 5% 2 4 3 3 3 4 5% 6% 51%	2600
December	1st to 10th	Night	17% 8% 2 6% 4 3 4 3 5% 5% 42%	2581
	11th to 20th	Night	18% 5% 2 5% 3 3 3 3 3 5% 50%	3042
	21st to end	Night	19% 5% 2 4 3 4 4 3 5% 6% 44%	4532

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	36% 4 6% 24% 24% 6%	2837
	11th to 20th	Day	35% 4 6% 17% 32% 7%	2840
	21st to end	Day	45% 4 5% 16% 23% 6%	3124
February	1st to 10th	Day	40% 5% 10% 20% 20% 5%	1710
	11th to 20th	Day	41% 4 7% 18% 23% 7%	1757
	21st to end	Day	46% 4 7% 17% 18% 7%	1683
March	1st to 10th	Day	47% 6% 8% 16% 15% 8%	3435
	11th to 20th	Day	30% 5% 9% 15% 27% 13%	3480
	21st to end	Day	44% 4 7% 19% 21% 5%	3815
April	1st to 10th	Day	30% 5% 11% 20% 27% 7%	2142
	11th to 20th	Day	35% 5% 11% 19% 21% 9%	2254
	21st to end	Day	33% 7% 13% 22% 20% 4	2327
May	1st to 10th	Day	42% 11% 15% 18% 12% 2	4120
	11th to 20th	Day	46% 7% 11% 20% 15% 1	4085
	21st to end	Day	30% 9% 16% 20% 22% 4	4489
June	1st to 10th	Day	37% 11% 17% 21% 14% 1	2470
	11th to 20th	Day	36% 9% 17% 21% 15% 2	2470
	21st to end	Day	34% 13% 16% 21% 15% 2	2470
July	1st to 10th	Day	41% 12% 18% 17% 11% 2	4055
	11th to 20th	Day	43% 14% 24% 15% 4 1	4051
	21st to end	Day	49% 13% 15% 15% 8%	4324
August	1st to 10th	Day	55% 10% 17% 12% 5%	4091
	11th to 20th	Day	41% 12% 17% 20% 9% 1	4033
	21st to end	Day	27% 8% 14% 33% 16% 2	4180
September	1st to 10th	Day	35% 10% 15% 18% 17% 5%	2224
	11th to 20th	Day	40% 7% 13% 16% 21% 4	2090
	21st to end	Day	43% 8% 9% 19% 16% 6%	2090
October	1st to 10th	Day	31% 5% 7% 20% 27% 10%	3176
	11th to 20th	Day	19% 4 5% 20% 27% 27%	3140
	21st to end	Day	25% 3 6% 24% 24% 18%	3428
November	1st to 10th	Day	33% 4 7% 20% 28% 9%	1957
	11th to 20th	Day	33% 4 8% 21% 27% 8%	1935
	21st to end	Day	35% 5% 8% 21% 24% 8%	1800
December	1st to 10th	Day	43% 4 10% 20% 19% 4	1782
	11th to 20th	Day	32% 3 7% 21% 26% 9%	2150
	21st to end	Day	41% 5% 8% 22% 21% 3	3124
January	1st to 10th	Night	37% 6% 7% 18% 26% 6%	4109
	11th to 20th	Night	38% 5% 8% 15% 26% 7%	4120
	21st to end	Night	43% 4 5% 16% 25% 7%	4532
February	1st to 10th	Night	41% 4 9% 19% 20% 7%	2470
	11th to 20th	Night	44% 3 9% 16% 22% 8%	2317
	21st to end	Night	38% 5% 10% 18% 21% 8%	1770
March	1st to 10th	Night	52% 5% 8% 13% 15% 6%	3418
	11th to 20th	Night	33% 5% 8% 13% 24% 16%	3480
	21st to end	Night	40% 5% 9% 19% 21% 7%	3817
April	1st to 10th	Night	33% 5% 10% 21% 24% 8%	2036
	11th to 20th	Night	34% 5% 9% 21% 21% 9%	1875
	21st to end	Night	34% 6% 13% 22% 20% 5%	1869
May	1st to 10th	Night	39% 8% 15% 23% 13% 2	2840
	11th to 20th	Night	44% 8% 12% 18% 16% 1	2813
	21st to end	Night	29% 10% 16% 27% 15% 2	3087
June	1st to 10th	Night	41% 10% 15% 20% 12% 2	1710
	11th to 20th	Night	40% 10% 16% 20% 12% 1	1710
	21st to end	Night	35% 14% 16% 21% 11% 3	1710
July	1st to 10th	Night	44% 12% 18% 14% 10% 2	2795
	11th to 20th	Night	45% 13% 23% 14% 4 1	2786
	21st to end	Night	56% 10% 13% 15% 6%	2988
August	1st to 10th	Night	55% 9% 18% 14% 4 1	2814
	11th to 20th	Night	40% 11% 22% 20% 7% 1	2827
	21st to end	Night	27% 8% 14% 28% 20% 4	3476
September	1st to 10th	Night	35% 8% 14% 21% 16% 6%	1951
	11th to 20th	Night	41% 8% 13% 15% 20% 3	2090
	21st to end	Night	45% 7% 12% 15% 16% 4	2090
October	1st to 10th	Night	34% 6% 9% 20% 26% 6%	3782
	11th to 20th	Night	22% 4 6% 17% 29% 23%	3779
	21st to end	Night	26% 3 6% 23% 25% 18%	4120
November	1st to 10th	Night	33% 5% 7% 19% 24% 12%	2341
	11th to 20th	Night	35% 4 7% 17% 26% 12%	2460
	21st to end	Night	33% 4 7% 22% 25% 8%	2600
December	1st to 10th	Night	43% 6% 9% 17% 20% 6%	2581
	11th to 20th	Night	39% 4 7% 18% 24% 8%	3044
	21st to end	Night	40% 5% 8% 21% 23% 3	4532

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% 24% 39% 15% 1	270
	11th to 20th	Day	24% 24% 36% 12% 4	270
	21st to end	Day	20% 26% 38% 13% 3	297
February	1st to 10th	Day	20% 21% 40% 15% 3	270
	11th to 20th	Day	33% 23% 34% 8% 1	270
	21st to end	Day	27% 23% 31% 17% 2	338
March	1st to 10th	Day	21% 20% 30% 23% 6%	460
	11th to 20th	Day	20% 22% 38% 14% 5%	460
	21st to end	Day	22% 21% 32% 18% 6% 1	506
April	1st to 10th	Day	22% 20% 30% 18% 9% 1	460
	11th to 20th	Day	14% 19% 31% 21% 14% 2	452
	21st to end	Day	16% 12% 30% 27% 12% 3	460
May	1st to 10th	Day	13% 17% 32% 24% 10% 4	463
	11th to 20th	Day	16% 9% 23% 27% 21% 5%	487
	21st to end	Day	15% 7% 20% 26% 25% 8%	529
June	1st to 10th	Day	11% 4 22% 35% 23% 6%	490
	11th to 20th	Day	10% 5% 22% 27% 25% 11%	490
	21st to end	Day	8% 3 18% 35% 28% 8%	490
July	1st to 10th	Day	9% 2 13% 27% 31% 17%	485
	11th to 20th	Day	10% 1 12% 30% 33% 14%	484
	21st to end	Day	8% 1 13% 35% 30% 12%	532
August	1st to 10th	Day	17% 3 15% 28% 23% 12%	486
	11th to 20th	Day	11% 3 13% 34% 24% 15%	479
	21st to end	Day	13% 1 13% 28% 27% 18%	539
September	1st to 10th	Day	13% 2 14% 29% 27% 15%	490
	11th to 20th	Day	16% 4 14% 28% 27% 10%	490
	21st to end	Day	19% 8% 19% 31% 19% 4	490
October	1st to 10th	Day	16% 7% 21% 27% 21% 7%	490
	11th to 20th	Day	11% 10% 27% 30% 18% 5%	490
	21st to end	Day	14% 10% 27% 28% 16% 5%	539
November	1st to 10th	Day	17% 9% 31% 28% 12% 2	495
	11th to 20th	Day	18% 16% 32% 22% 11% 1	435
	21st to end	Day	14% 17% 34% 23% 10% 2	300
December	1st to 10th	Day	25% 15% 40% 16% 4	294
	11th to 20th	Day	22% 16% 33% 21% 8% 1	270
	21st to end	Day	25% 15% 33% 18% 7% 2	297
January	1st to 10th	Night	23% 14% 30% 27% 5% 1	760
	11th to 20th	Night	20% 14% 32% 30% 5%	760
	21st to end	Night	20% 13% 33% 31% 3	836
February	1st to 10th	Night	19% 13% 35% 29% 4	760
	11th to 20th	Night	26% 17% 36% 19% 2	743
	21st to end	Night	19% 17% 34% 25% 4	628
March	1st to 10th	Night	19% 14% 34% 29% 5%	760
	11th to 20th	Night	18% 17% 32% 24% 8% 1	760
	21st to end	Night	19% 15% 35% 26% 5%	836
April	1st to 10th	Night	17% 16% 33% 26% 7% 1	760
	11th to 20th	Night	16% 14% 31% 27% 13%	751
	21st to end	Night	15% 8% 30% 36% 11%	729
May	1st to 10th	Night	12% 11% 32% 34% 12% 1	570
	11th to 20th	Night	14% 7% 22% 35% 21% 1	561
	21st to end	Night	12% 3 15% 40% 30% 1	617
June	1st to 10th	Night	10% 2 21% 38% 25% 3	570
	11th to 20th	Night	12% 4 15% 32% 32% 5%	570
	21st to end	Night	10% 2 14% 38% 32% 3	570
July	1st to 10th	Night	10% 2 11% 31% 40% 6%	555
	11th to 20th	Night	10% 2 8% 33% 40% 8%	552
	21st to end	Night	7% 1 13% 36% 38% 5%	624
August	1st to 10th	Night	12% 3 11% 32% 36% 6%	567
	11th to 20th	Night	13% 1 10% 34% 36% 6%	566
	21st to end	Night	10% 1 13% 31% 39% 5%	836
September	1st to 10th	Night	10% 3 12% 32% 38% 6%	760
	11th to 20th	Night	16% 4 15% 28% 33% 5%	760
	21st to end	Night	19% 5% 19% 33% 22% 2	760
October	1st to 10th	Night	15% 6% 19% 27% 28% 5%	760
	11th to 20th	Night	14% 7% 24% 33% 19% 3	760
	21st to end	Night	15% 10% 21% 31% 22% 2	836
November	1st to 10th	Night	15% 8% 24% 33% 17% 2	780
	11th to 20th	Night	15% 13% 29% 32% 12%	800
	21st to end	Night	16% 11% 29% 31% 13% 1	800
December	1st to 10th	Night	22% 11% 28% 33% 6%	795
	11th to 20th	Night	19% 10% 28% 33% 10%	760
	21st to end	Night	25% 11% 25% 30% 9%	836

Page generated at 2024-12-06 03:54:53. Version ac07

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