Keota Star Party
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Keota Star Party clear sky chart from 2005-11-06 to 2024-11-28.

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	5% 5% 2 5% 4 4 4 4 6% 8% 54%	105395
	Night	6% 6% 2 6% 4 4 4 4 6% 7% 52%	102861
Transparency	Day	28% 6% 11% 25% 22% 9%	105136
	Night	30% 6% 12% 25% 21% 7%	102710
Seeing	Day	9% 8% 26% 31% 20% 6%	15758
	Night	9% 8% 31% 39% 13% 1	25770

By Month

Percentage Cloud Cover SW (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	2 7% 3 6% 3 5% 3 3 3 6% 58%	2538
	11th to 20th	Day	2 7% 3 9% 6% 6% 5% 4 6% 7% 46%	2540
	21st to end	Day	2 5% 2 4 4 3 4 3 5% 7% 60%	3050
February	1st to 10th	Day	3 10% 3 9% 6% 4 4 4 5% 7% 45%	1724
	11th to 20th	Day	3 7% 2 6% 5% 4 4 4 6% 7% 50%	1849
	21st to end	Day	3 8% 3 7% 4 4 4 4 5% 6% 52%	1570
March	1st to 10th	Day	4 8% 3 6% 4 3 4 4 6% 7% 52%	3130
	11th to 20th	Day	6% 7% 2 6% 4 3 4 3 5% 5% 55%	3320
	21st to end	Day	5% 8% 2 7% 5% 5% 5% 4 7% 9% 44%	4134
April	1st to 10th	Day	8% 7% 2 5% 4 3 5% 4 5% 8% 49%	2280
	11th to 20th	Day	11% 9% 2 6% 4 4 5% 4 5% 7% 42%	2251
	21st to end	Day	10% 7% 2 5% 5% 4 5% 4 6% 8% 44%	2299
May	1st to 10th	Day	10% 8% 3 7% 5% 6% 5% 4 6% 6% 42%	4120
	11th to 20th	Day	8% 5% 2 5% 4 5% 6% 5% 7% 9% 45%	4320
	21st to end	Day	7% 4 1 5% 4 4 5% 5% 7% 9% 49%	4825
June	1st to 10th	Day	6% 3 1 3 3 4 4 5% 7% 11% 54%	2660
	11th to 20th	Day	6% 3 1 5% 4 4 5% 4 6% 8% 54%	2660
	21st to end	Day	3 3 1 4 4 4 5% 5% 7% 9% 56%	2660
July	1st to 10th	Day	7% 4 2 5% 3 3 4 4 6% 7% 55%	4430
	11th to 20th	Day	2 3 1 4 4 4 5% 5% 8% 11% 54%	4430
	21st to end	Day	3 2 2 4 4 5% 5% 4 7% 8% 56%	4802
August	1st to 10th	Day	10% 3 1 4 3 4 5% 5% 8% 11% 46%	4168
	11th to 20th	Day	3 3 2 4 4 5% 5% 4 7% 9% 55%	3726
	21st to end	Day	4 3 1 4 3 3 5% 4 6% 9% 58%	4180
September	1st to 10th	Day	5% 4 1 4 3 2 3 3 5% 7% 63%	2280
	11th to 20th	Day	6% 3 1 3 4 4 3 3 5% 7% 63%	2215
	21st to end	Day	8% 3 2 3 2 3 2 2 4 6% 65%	2090
October	1st to 10th	Day	5% 3 1 2 1 2 2 2 3 4 75%	3302
	11th to 20th	Day	4 4 3 5% 3 2 3 2 4 6% 64%	3150
	21st to end	Day	7% 6% 2 4 2 3 2 3 5% 8% 58%	3189
November	1st to 10th	Day	3 5% 2 4 4 3 3 3 5% 9% 58%	1763
	11th to 20th	Day	3 6% 2 3 3 4 3 3 6% 6% 60%	1800
	21st to end	Day	3 7% 2 5% 4 3 3 3 4 6% 59%	1700
December	1st to 10th	Day	3 5% 3 9% 4 4 4 4 4 7% 53%	1520
	11th to 20th	Day	3 8% 3 6% 4 4 4 4 5% 7% 53%	1926
	21st to end	Day	4 8% 3 8% 4 5% 4 3 6% 6% 48%	2794
January	1st to 10th	Night	3 6% 3 8% 4 3 4 3 6% 7% 53%	4417
	11th to 20th	Night	2 5% 3 7% 4 4 5% 4 6% 8% 51%	4430
	21st to end	Night	2 6% 3 8% 4 4 4 3 4 6% 55%	4645
February	1st to 10th	Night	4 9% 4 7% 5% 4 4 4 5% 7% 48%	2455
	11th to 20th	Night	3 7% 3 7% 6% 5% 5% 4 6% 6% 49%	2218
	21st to end	Night	3 8% 3 7% 4 4 4 3 4 6% 54%	1884
March	1st to 10th	Night	3 10% 3 7% 4 3 4 3 4 6% 53%	3734
	11th to 20th	Night	9% 9% 3 5% 4 3 3 3 4 5% 52%	3652
	21st to end	Night	7% 8% 3 6% 5% 5% 5% 4 6% 8% 45%	3509
April	1st to 10th	Night	8% 8% 3 6% 5% 3 3 4 5% 6% 49%	1900
	11th to 20th	Night	12% 8% 3 6% 5% 4 3 3 4 7% 45%	1877
	21st to end	Night	14% 9% 3 5% 4 4 4 4 6% 7% 41%	1881
May	1st to 10th	Night	10% 6% 3 7% 5% 5% 5% 6% 7% 8% 38%	2850
	11th to 20th	Night	10% 5% 2 6% 3 4 5% 4 7% 9% 44%	2581
	21st to end	Night	11% 6% 2 7% 5% 5% 5% 4 6% 8% 41%	2762
June	1st to 10th	Night	6% 3 2 5% 3 3 4 5% 9% 11% 50%	1520
	11th to 20th	Night	7% 4 2 4 4 3 4 4 6% 8% 54%	1520
	21st to end	Night	5% 4 2 5% 4 4 6% 4 7% 8% 50%	1520
July	1st to 10th	Night	5% 4 2 6% 4 4 5% 4 5% 7% 53%	2540
	11th to 20th	Night	2 3 2 4 4 4 6% 5% 9% 10% 52%	2540
	21st to end	Night	4 4 1 6% 4 4 5% 4 7% 9% 52%	2761
August	1st to 10th	Night	12% 4 2 6% 5% 5% 6% 5% 8% 8% 38%	2764
	11th to 20th	Night	3 6% 2 7% 5% 6% 6% 5% 7% 9% 45%	3113
	21st to end	Night	3 3 1 4 3 5% 6% 5% 9% 10% 50%	3487
September	1st to 10th	Night	6% 4 2 5% 4 3 4 4 6% 9% 54%	1900
	11th to 20th	Night	7% 3 1 4 3 3 4 4 5% 7% 59%	1963
	21st to end	Night	6% 4 1 4 3 3 3 3 5% 5% 63%	2090
October	1st to 10th	Night	6% 3 1 3 2 2 3 2 3 5% 70%	3662
	11th to 20th	Night	7% 3 2 5% 3 3 3 3 5% 6% 58%	3778
	21st to end	Night	7% 5% 2 4 3 3 3 3 5% 6% 60%	4336
November	1st to 10th	Night	4 5% 2 4 3 4 4 3 5% 8% 58%	2535
	11th to 20th	Night	4 5% 2 6% 4 3 3 3 4 7% 60%	2600
	21st to end	Night	4 7% 3 5% 4 3 4 3 5% 6% 56%	2633
December	1st to 10th	Night	3 6% 2 7% 4 4 4 3 5% 8% 55%	2660
	11th to 20th	Night	4 6% 2 5% 3 3 4 4 6% 7% 56%	3271
	21st to end	Night	6% 8% 3 7% 4 3 4 4 6% 7% 47%	4873

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	28% 4 11% 32% 19% 6%	2539
	11th to 20th	Day	36% 6% 15% 24% 15% 4	2540
	21st to end	Day	23% 5% 17% 32% 19% 4	3050
February	1st to 10th	Day	38% 4 11% 25% 17% 5%	1724
	11th to 20th	Day	33% 3 9% 28% 22% 5%	1859
	21st to end	Day	32% 4 8% 26% 22% 8%	1570
March	1st to 10th	Day	29% 5% 9% 21% 29% 7%	3130
	11th to 20th	Day	30% 5% 14% 33% 15% 3	3320
	21st to end	Day	33% 9% 13% 32% 10% 2	4134
April	1st to 10th	Day	32% 5% 13% 25% 17% 8%	2280
	11th to 20th	Day	40% 5% 10% 21% 16% 7%	2254
	21st to end	Day	36% 6% 9% 29% 18% 2	2299
May	1st to 10th	Day	39% 7% 9% 25% 14% 5%	4120
	11th to 20th	Day	30% 10% 13% 28% 17% 2	4324
	21st to end	Day	28% 9% 14% 26% 19% 4	4825
June	1st to 10th	Day	24% 7% 18% 27% 17% 7%	2660
	11th to 20th	Day	27% 6% 10% 23% 23% 11%	2660
	21st to end	Day	22% 6% 9% 25% 25% 12%	2660
July	1st to 10th	Day	26% 5% 8% 17% 29% 14%	4361
	11th to 20th	Day	21% 6% 12% 24% 22% 16%	4355
	21st to end	Day	23% 6% 10% 20% 19% 22%	4651
August	1st to 10th	Day	30% 6% 15% 25% 16% 7%	4153
	11th to 20th	Day	25% 6% 11% 21% 24% 13%	3762
	21st to end	Day	22% 5% 9% 21% 27% 16%	4179
September	1st to 10th	Day	21% 4 6% 23% 28% 18%	2280
	11th to 20th	Day	22% 5% 7% 20% 30% 16%	2215
	21st to end	Day	22% 4 6% 23% 35% 11%	2090
October	1st to 10th	Day	15% 3 6% 18% 32% 26%	3302
	11th to 20th	Day	23% 3 8% 29% 27% 10%	3150
	21st to end	Day	25% 2 7% 27% 29% 9%	3189
November	1st to 10th	Day	24% 4 11% 26% 25% 10%	1763
	11th to 20th	Day	24% 3 8% 27% 29% 8%	1800
	21st to end	Day	27% 3 9% 25% 28% 8%	1700
December	1st to 10th	Day	31% 5% 11% 28% 19% 6%	1520
	11th to 20th	Day	31% 5% 9% 26% 27% 3	1924
	21st to end	Day	34% 7% 9% 27% 19% 4	2794
January	1st to 10th	Night	29% 5% 11% 30% 22% 4	4417
	11th to 20th	Night	29% 7% 14% 22% 21% 7%	4430
	21st to end	Night	30% 6% 14% 32% 16% 3	4645
February	1st to 10th	Night	36% 5% 11% 24% 18% 5%	2455
	11th to 20th	Night	34% 5% 11% 26% 20% 4	2218
	21st to end	Night	32% 3 8% 24% 24% 9%	1884
March	1st to 10th	Night	32% 5% 7% 19% 29% 8%	3734
	11th to 20th	Night	34% 5% 13% 23% 22% 3	3652
	21st to end	Night	33% 9% 15% 30% 12% 1	3509
April	1st to 10th	Night	34% 6% 9% 24% 18% 7%	1900
	11th to 20th	Night	39% 5% 12% 23% 16% 5%	1877
	21st to end	Night	41% 6% 9% 23% 19% 2	1881
May	1st to 10th	Night	38% 9% 14% 24% 10% 5%	2850
	11th to 20th	Night	33% 9% 17% 27% 10% 3	2582
	21st to end	Night	37% 11% 17% 18% 12% 5%	2762
June	1st to 10th	Night	24% 9% 23% 27% 13% 4	1520
	11th to 20th	Night	28% 8% 12% 24% 18% 10%	1520
	21st to end	Night	29% 7% 11% 26% 23% 6%	1520
July	1st to 10th	Night	28% 6% 12% 22% 26% 6%	2500
	11th to 20th	Night	23% 6% 18% 21% 25% 7%	2492
	21st to end	Night	25% 7% 13% 25% 19% 11%	2674
August	1st to 10th	Night	40% 7% 16% 20% 13% 3	2756
	11th to 20th	Night	34% 8% 14% 21% 15% 9%	3143
	21st to end	Night	25% 6% 16% 22% 22% 9%	3487
September	1st to 10th	Night	27% 5% 8% 22% 24% 14%	1900
	11th to 20th	Night	24% 5% 8% 25% 25% 13%	1963
	21st to end	Night	23% 3 8% 25% 28% 12%	2090
October	1st to 10th	Night	18% 4 6% 19% 28% 25%	3662
	11th to 20th	Night	26% 3 11% 27% 25% 8%	3778
	21st to end	Night	26% 3 9% 27% 24% 11%	4336
November	1st to 10th	Night	25% 4 10% 24% 26% 10%	2535
	11th to 20th	Night	25% 4 9% 27% 26% 9%	2600
	21st to end	Night	29% 4 8% 25% 27% 7%	2633
December	1st to 10th	Night	28% 4 13% 29% 19% 7%	2660
	11th to 20th	Night	27% 4 8% 32% 25% 3	3272
	21st to end	Night	33% 7% 9% 27% 20% 4	4873

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	6% 9% 30% 38% 13% 5%	270
	11th to 20th	Day	9% 9% 39% 34% 9% 1	270
	21st to end	Day	3 11% 43% 31% 9% 2	297
February	1st to 10th	Day	8% 14% 43% 31% 4 1	270
	11th to 20th	Day	8% 10% 37% 35% 9% 1	270
	21st to end	Day	6% 19% 37% 29% 8%	225
March	1st to 10th	Day	8% 12% 31% 30% 17% 2	270
	11th to 20th	Day	10% 13% 32% 29% 13% 2	355
	21st to end	Day	14% 14% 33% 30% 8% 1	506
April	1st to 10th	Day	15% 15% 34% 25% 9% 2	460
	11th to 20th	Day	17% 18% 32% 21% 9% 2	452
	21st to end	Day	16% 15% 25% 27% 13% 4	479
May	1st to 10th	Day	16% 12% 27% 27% 15% 3	653
	11th to 20th	Day	16% 8% 24% 28% 20% 5%	675
	21st to end	Day	11% 9% 26% 27% 21% 6%	734
June	1st to 10th	Day	6% 5% 21% 32% 26% 11%	680
	11th to 20th	Day	7% 6% 29% 33% 21% 4	680
	21st to end	Day	4 4 24% 39% 23% 5%	680
July	1st to 10th	Day	8% 3 15% 30% 34% 10%	671
	11th to 20th	Day	4 2 16% 33% 36% 9%	668
	21st to end	Day	4 1 16% 31% 36% 10%	739
August	1st to 10th	Day	6% 2 15% 34% 36% 7%	565
	11th to 20th	Day	3 4 22% 33% 26% 13%	477
	21st to end	Day	4 2 19% 36% 29% 9%	539
September	1st to 10th	Day	6% 3 21% 32% 27% 11%	490
	11th to 20th	Day	5% 4 20% 28% 32% 11%	425
	21st to end	Day	12% 2 21% 27% 22% 16%	300
October	1st to 10th	Day	9% 6% 23% 24% 25% 13%	300
	11th to 20th	Day	5% 8% 33% 30% 16% 8%	300
	21st to end	Day	12% 8% 31% 31% 14% 4	330
November	1st to 10th	Day	7% 9% 29% 34% 14% 6%	300
	11th to 20th	Day	6% 10% 35% 34% 13% 2	300
	21st to end	Day	10% 8% 26% 41% 12% 3	291
December	1st to 10th	Day	7% 13% 33% 31% 15%	270
	11th to 20th	Day	8% 8% 44% 33% 7%	270
	21st to end	Day	9% 13% 36% 31% 10%	297
January	1st to 10th	Night	7% 10% 33% 38% 10% 2	950
	11th to 20th	Night	6% 11% 40% 34% 8% 1	950
	21st to end	Night	7% 8% 43% 34% 8% 1	908
February	1st to 10th	Night	9% 9% 43% 32% 7%	760
	11th to 20th	Night	7% 9% 43% 35% 6%	744
	21st to end	Night	7% 12% 46% 31% 4	628
March	1st to 10th	Night	6% 11% 35% 40% 8%	760
	11th to 20th	Night	10% 8% 34% 37% 11% 1	760
	21st to end	Night	11% 10% 40% 32% 7% 1	646
April	1st to 10th	Night	14% 11% 38% 31% 5%	570
	11th to 20th	Night	17% 11% 35% 31% 6% 1	563
	21st to end	Night	19% 11% 27% 32% 10% 1	570
May	1st to 10th	Night	14% 12% 28% 32% 13% 1	570
	11th to 20th	Night	17% 7% 27% 34% 14% 1	561
	21st to end	Night	13% 5% 32% 34% 15% 1	617
June	1st to 10th	Night	6% 3 24% 44% 21% 1	570
	11th to 20th	Night	7% 6% 30% 45% 11% 1	570
	21st to end	Night	7% 4 25% 47% 17%	570
July	1st to 10th	Night	8% 2 17% 47% 25% 1	555
	11th to 20th	Night	5% 1 15% 49% 27% 2	552
	21st to end	Night	6% 2 13% 49% 29% 1	624
August	1st to 10th	Night	7% 2 16% 44% 29% 2	567
	11th to 20th	Night	5% 1 19% 50% 24%	564
	21st to end	Night	5% 2 18% 49% 24% 1	627
September	1st to 10th	Night	7% 3 18% 49% 21% 2	570
	11th to 20th	Night	8% 4 21% 44% 20% 3	570
	21st to end	Night	8% 3 27% 44% 17% 1	570
October	1st to 10th	Night	14% 7% 24% 36% 18% 2	674
	11th to 20th	Night	8% 7% 34% 35% 16% 1	760
	21st to end	Night	10% 9% 29% 39% 11% 1	964
November	1st to 10th	Night	7% 6% 34% 41% 11% 2	975
	11th to 20th	Night	7% 10% 33% 41% 8% 1	1000
	21st to end	Night	8% 9% 31% 41% 10% 1	986
December	1st to 10th	Night	6% 10% 41% 37% 6%	950
	11th to 20th	Night	8% 9% 37% 39% 7% 1	950
	21st to end	Night	9% 12% 36% 37% 7% 1	1045

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