Kitt's Castle Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kitt's Castle Observatory clear sky chart from 2005-11-06 to 2024-01-15.

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 7% 6% 3 5% 5% 5% 7% 31%	75339
	Night	15% 10% 4 7% 6% 3 4 4 5% 7% 34%	74428
Transparency	Day	52% 5% 11% 20% 11% 1	75058
	Night	51% 5% 10% 20% 12% 2	74230
Seeing	Day	20% 9% 27% 23% 14% 6%	14142
	Night	20% 8% 28% 29% 13% 2	23859

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% 14% 8% 13% 8% 5% 5% 4 4 4 17%	1706
	11th to 20th	Day	18% 19% 8% 12% 8% 5% 5% 3 4 4 14%	1656
	21st to end	Day	15% 18% 9% 14% 9% 3 5% 4 4 5% 15%	1782
February	1st to 10th	Day	19% 17% 6% 9% 9% 4 4 4 4 5% 20%	1620
	11th to 20th	Day	15% 12% 7% 12% 8% 4 5% 4 5% 6% 21%	1704
	21st to end	Day	18% 13% 7% 9% 6% 4 5% 4 4 5% 25%	1480
March	1st to 10th	Day	18% 12% 6% 8% 7% 4 5% 4 4 6% 26%	1879
	11th to 20th	Day	16% 15% 5% 8% 6% 3 4 4 4 7% 26%	1980
	21st to end	Day	22% 11% 5% 9% 7% 3 4 4 4 6% 25%	2178
April	1st to 10th	Day	14% 13% 5% 8% 6% 2 4 5% 6% 7% 30%	2024
	11th to 20th	Day	17% 10% 4 7% 6% 3 4 4 5% 6% 34%	2284
	21st to end	Day	20% 9% 4 7% 6% 3 4 5% 5% 7% 31%	2340
May	1st to 10th	Day	17% 10% 3 8% 6% 3 5% 5% 5% 7% 31%	2340
	11th to 20th	Day	21% 7% 4 6% 6% 4 4 4 7% 8% 30%	2301
	21st to end	Day	9% 6% 2 6% 8% 5% 6% 6% 8% 9% 36%	2531
June	1st to 10th	Day	13% 6% 3 6% 7% 4 5% 5% 6% 9% 36%	2340
	11th to 20th	Day	12% 7% 3 6% 6% 4 5% 6% 6% 9% 35%	2430
	21st to end	Day	11% 5% 2 6% 6% 4 6% 7% 7% 9% 38%	2520
July	1st to 10th	Day	11% 6% 3 6% 6% 3 5% 5% 7% 10% 38%	2520
	11th to 20th	Day	11% 5% 2 4 4 3 5% 6% 7% 11% 41%	2340
	21st to end	Day	10% 4 3 6% 5% 4 6% 7% 8% 10% 38%	2547
August	1st to 10th	Day	8% 5% 2 5% 7% 5% 6% 6% 7% 10% 40%	2327
	11th to 20th	Day	11% 6% 2 5% 7% 4 6% 7% 7% 9% 37%	2303
	21st to end	Day	9% 5% 2 6% 6% 4 6% 6% 7% 9% 41%	2556
September	1st to 10th	Day	13% 6% 2 5% 5% 3 5% 5% 5% 6% 45%	1990
	11th to 20th	Day	10% 7% 3 5% 6% 3 4 5% 6% 9% 43%	1980
	21st to end	Day	19% 6% 2 6% 5% 3 3 4 5% 5% 42%	1980
October	1st to 10th	Day	15% 9% 3 6% 5% 3 3 4 5% 9% 40%	1918
	11th to 20th	Day	15% 9% 3 6% 5% 3 6% 5% 5% 8% 36%	1800
	21st to end	Day	20% 13% 4 6% 6% 4 5% 4 5% 6% 28%	1917
November	1st to 10th	Day	11% 9% 3 7% 5% 3 4 5% 5% 7% 41%	1672
	11th to 20th	Day	17% 13% 6% 6% 6% 3 4 4 4 6% 32%	1710
	21st to end	Day	18% 15% 6% 8% 5% 3 4 3 4 6% 26%	1710
December	1st to 10th	Day	17% 17% 9% 12% 8% 2 5% 3 3 5% 18%	1697
	11th to 20th	Day	16% 15% 8% 12% 7% 3 5% 5% 4 6% 19%	2153
	21st to end	Day	22% 24% 10% 11% 6% 3 4 4 3 4 10%	3124
January	1st to 10th	Night	16% 17% 7% 12% 8% 3 5% 4 4 4 20%	2459
	11th to 20th	Night	17% 18% 6% 10% 9% 4 4 4 4 3 20%	2399
	21st to end	Night	16% 16% 7% 10% 8% 4 4 4 4 5% 20%	2574
February	1st to 10th	Night	21% 13% 6% 10% 8% 3 5% 5% 4 5% 21%	2340
	11th to 20th	Night	16% 13% 5% 9% 9% 4 5% 4 5% 5% 24%	2138
	21st to end	Night	20% 12% 6% 11% 6% 4 4 4 4 4 25%	1776
March	1st to 10th	Night	16% 11% 5% 9% 7% 4 4 4 4 5% 31%	2080
	11th to 20th	Night	14% 10% 4 7% 5% 3 4 5% 5% 8% 36%	1980
	21st to end	Night	19% 10% 4 8% 6% 3 4 4 5% 6% 31%	2178
April	1st to 10th	Night	15% 11% 4 6% 5% 3 4 5% 5% 7% 33%	1950
	11th to 20th	Night	16% 8% 3 6% 6% 3 5% 4 5% 7% 36%	1625
	21st to end	Night	15% 9% 4 6% 5% 4 4 5% 6% 6% 36%	1620
May	1st to 10th	Night	17% 10% 3 7% 7% 4 5% 4 6% 7% 30%	1620
	11th to 20th	Night	18% 8% 3 7% 4 3 3 4 5% 7% 37%	1592
	21st to end	Night	8% 5% 2 5% 5% 3 5% 5% 8% 11% 41%	1744
June	1st to 10th	Night	9% 6% 3 5% 5% 4 5% 5% 5% 6% 46%	1620
	11th to 20th	Night	9% 5% 2 5% 4 2 6% 7% 8% 9% 43%	1523
	21st to end	Night	10% 4 2 6% 6% 3 4 6% 6% 10% 44%	1440
July	1st to 10th	Night	8% 4 3 5% 6% 4 5% 5% 6% 8% 46%	1440
	11th to 20th	Night	8% 3 2 4 5% 4 6% 5% 7% 10% 48%	1615
	21st to end	Night	7% 6% 3 4 6% 4 4 6% 7% 8% 45%	1771
August	1st to 10th	Night	6% 5% 2 4 5% 4 5% 7% 7% 12% 43%	1611
	11th to 20th	Night	8% 6% 3 5% 5% 3 5% 5% 6% 8% 46%	1598
	21st to end	Night	7% 4 1 5% 5% 3 4 5% 6% 9% 52%	1795
September	1st to 10th	Night	12% 5% 3 4 4 2 4 5% 5% 6% 49%	1952
	11th to 20th	Night	10% 5% 2 4 3 2 4 4 4 7% 54%	1980
	21st to end	Night	13% 7% 2 5% 5% 2 4 4 6% 7% 45%	1980
October	1st to 10th	Night	11% 6% 2 5% 5% 3 4 5% 5% 7% 47%	2040
	11th to 20th	Night	17% 9% 3 6% 6% 3 4 3 4 6% 39%	2160
	21st to end	Night	23% 9% 3 5% 5% 3 4 4 4 6% 33%	2438
November	1st to 10th	Night	13% 8% 3 6% 5% 3 4 4 5% 7% 42%	2406
	11th to 20th	Night	16% 11% 5% 7% 6% 3 3 4 5% 7% 33%	2470
	21st to end	Night	18% 14% 4 9% 5% 3 4 5% 5% 6% 27%	2470
December	1st to 10th	Night	19% 16% 7% 10% 6% 3 4 4 4 6% 20%	2470
	11th to 20th	Night	17% 15% 8% 10% 6% 3 4 3 4 5% 24%	3042
	21st to end	Night	21% 21% 10% 10% 6% 3 4 4 4 5% 13%	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	71% 3 7% 12% 5% 1	1707
	11th to 20th	Day	75% 3 10% 9% 3	1656
	21st to end	Day	72% 5% 6% 12% 4 1	1782
February	1st to 10th	Day	68% 3 9% 13% 6% 1	1620
	11th to 20th	Day	65% 4 7% 15% 8% 1	1714
	21st to end	Day	62% 3 11% 15% 7% 2	1480
March	1st to 10th	Day	60% 5% 10% 19% 7%	1879
	11th to 20th	Day	59% 4 9% 18% 9% 2	1980
	21st to end	Day	61% 4 9% 18% 6% 1	2178
April	1st to 10th	Day	53% 4 13% 18% 11% 1	2024
	11th to 20th	Day	51% 5% 11% 18% 13% 2	2284
	21st to end	Day	53% 5% 10% 20% 11% 2	2340
May	1st to 10th	Day	51% 5% 13% 20% 9% 1	2340
	11th to 20th	Day	52% 5% 13% 17% 12% 1	2305
	21st to end	Day	42% 7% 14% 24% 12% 1	2531
June	1st to 10th	Day	44% 6% 11% 24% 14% 1	2340
	11th to 20th	Day	44% 6% 13% 22% 13% 1	2430
	21st to end	Day	39% 8% 14% 21% 15% 3	2520
July	1st to 10th	Day	41% 6% 12% 23% 16% 2	2451
	11th to 20th	Day	35% 7% 13% 27% 16% 2	2271
	21st to end	Day	36% 8% 13% 26% 14% 2	2405
August	1st to 10th	Day	37% 7% 13% 27% 14% 1	2314
	11th to 20th	Day	41% 7% 13% 26% 11% 2	2303
	21st to end	Day	37% 7% 13% 21% 16% 5%	2556
September	1st to 10th	Day	40% 5% 11% 23% 18% 3	1990
	11th to 20th	Day	38% 5% 12% 26% 17% 2	1980
	21st to end	Day	43% 5% 10% 22% 20% 1	1980
October	1st to 10th	Day	43% 5% 10% 24% 17% 1	1918
	11th to 20th	Day	46% 5% 11% 21% 15% 2	1800
	21st to end	Day	57% 5% 11% 17% 9% 1	1917
November	1st to 10th	Day	42% 5% 10% 23% 17% 2	1672
	11th to 20th	Day	55% 3 9% 20% 11% 2	1710
	21st to end	Day	60% 3 10% 17% 9% 1	1710
December	1st to 10th	Day	70% 3 8% 15% 4 1	1697
	11th to 20th	Day	66% 4 9% 16% 6%	2150
	21st to end	Day	80% 4 6% 7% 3	3124
January	1st to 10th	Night	68% 3 7% 15% 6%	2459
	11th to 20th	Night	70% 4 9% 12% 5% 1	2399
	21st to end	Night	67% 3 8% 15% 6% 1	2574
February	1st to 10th	Night	66% 4 9% 14% 6% 1	2340
	11th to 20th	Night	61% 5% 8% 16% 9% 1	2139
	21st to end	Night	64% 3 8% 15% 8% 2	1776
March	1st to 10th	Night	57% 4 9% 19% 11% 1	2080
	11th to 20th	Night	47% 4 10% 24% 12% 3	1980
	21st to end	Night	54% 4 8% 21% 12% 2	2178
April	1st to 10th	Night	49% 5% 12% 17% 15% 2	1950
	11th to 20th	Night	47% 5% 10% 18% 17% 3	1625
	21st to end	Night	48% 5% 11% 20% 14% 2	1620
May	1st to 10th	Night	53% 5% 11% 17% 11% 3	1620
	11th to 20th	Night	47% 5% 11% 18% 17% 3	1593
	21st to end	Night	35% 7% 16% 27% 14% 2	1745
June	1st to 10th	Night	38% 5% 12% 25% 18% 2	1620
	11th to 20th	Night	34% 8% 15% 25% 16% 3	1523
	21st to end	Night	35% 6% 14% 26% 16% 4	1440
July	1st to 10th	Night	35% 6% 13% 23% 18% 5%	1400
	11th to 20th	Night	31% 7% 13% 28% 19% 2	1562
	21st to end	Night	34% 6% 14% 27% 16% 4	1672
August	1st to 10th	Night	32% 7% 16% 28% 17% 1	1600
	11th to 20th	Night	35% 6% 15% 27% 16% 1	1598
	21st to end	Night	29% 6% 15% 25% 21% 5%	1795
September	1st to 10th	Night	35% 5% 13% 26% 16% 6%	1952
	11th to 20th	Night	31% 4 10% 28% 25% 3	1980
	21st to end	Night	38% 5% 10% 23% 23% 2	1980
October	1st to 10th	Night	36% 5% 11% 26% 21% 2	2040
	11th to 20th	Night	48% 3 7% 25% 15% 1	2160
	21st to end	Night	53% 4 8% 21% 11% 2	2438
November	1st to 10th	Night	43% 4 10% 23% 17% 3	2406
	11th to 20th	Night	52% 3 9% 21% 13% 2	2470
	21st to end	Night	58% 4 12% 18% 8% 1	2470
December	1st to 10th	Night	66% 4 7% 16% 7%	2470
	11th to 20th	Night	63% 4 10% 18% 5%	3044
	21st to end	Night	74% 5% 8% 10% 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	28% 17% 35% 14% 6% 1	270
	11th to 20th	Day	28% 14% 42% 10% 5%	252
	21st to end	Day	26% 18% 34% 18% 3	264
February	1st to 10th	Day	31% 18% 35% 16%	240
	11th to 20th	Day	25% 23% 36% 14% 2	240
	21st to end	Day	27% 24% 37% 11% 1	198
March	1st to 10th	Day	23% 17% 37% 19% 4	319
	11th to 20th	Day	25% 14% 36% 19% 4 1	420
	21st to end	Day	31% 13% 30% 21% 5% 1	462
April	1st to 10th	Day	23% 11% 34% 20% 9% 2	420
	11th to 20th	Day	21% 17% 28% 20% 10% 5%	412
	21st to end	Day	28% 10% 33% 19% 7% 3	420
May	1st to 10th	Day	29% 6% 30% 24% 9% 3	423
	11th to 20th	Day	23% 6% 29% 25% 12% 5%	447
	21st to end	Day	12% 5% 25% 28% 21% 9%	485
June	1st to 10th	Day	16% 4 21% 35% 18% 5%	450
	11th to 20th	Day	17% 5% 23% 28% 23% 5%	540
	21st to end	Day	14% 6% 27% 29% 18% 6%	630
July	1st to 10th	Day	14% 3 16% 27% 24% 16%	621
	11th to 20th	Day	12% 1 19% 30% 24% 13%	444
	21st to end	Day	13% 3 18% 25% 27% 13%	488
August	1st to 10th	Day	12% 2 12% 28% 29% 17%	446
	11th to 20th	Day	16% 2 16% 28% 26% 12%	439
	21st to end	Day	13% 3 17% 28% 26% 14%	495
September	1st to 10th	Day	16% 2 17% 26% 26% 13%	450
	11th to 20th	Day	12% 2 13% 26% 29% 17%	450
	21st to end	Day	19% 8% 18% 26% 20% 10%	450
October	1st to 10th	Day	15% 5% 26% 27% 19% 8%	450
	11th to 20th	Day	17% 13% 34% 24% 10% 2	450
	21st to end	Day	31% 10% 32% 21% 4 1	432
November	1st to 10th	Day	16% 16% 33% 22% 11% 3	270
	11th to 20th	Day	25% 16% 30% 20% 9% 1	270
	21st to end	Day	27% 13% 40% 17% 3	270
December	1st to 10th	Day	24% 20% 34% 15% 5% 2	258
	11th to 20th	Day	24% 19% 38% 17% 2	270
	21st to end	Day	34% 14% 33% 15% 2	297
January	1st to 10th	Night	25% 15% 37% 20% 3	760
	11th to 20th	Night	29% 14% 36% 17% 3 1	739
	21st to end	Night	24% 14% 36% 21% 4	792
February	1st to 10th	Night	28% 10% 40% 19% 3	720
	11th to 20th	Night	25% 14% 35% 23% 3	703
	21st to end	Night	29% 11% 40% 17% 3	592
March	1st to 10th	Night	24% 13% 34% 22% 7%	720
	11th to 20th	Night	21% 11% 36% 25% 6% 1	720
	21st to end	Night	25% 9% 32% 26% 7%	792
April	1st to 10th	Night	22% 10% 35% 27% 5% 1	690
	11th to 20th	Night	20% 9% 35% 23% 11% 2	533
	21st to end	Night	21% 5% 39% 26% 8% 1	540
May	1st to 10th	Night	23% 5% 32% 30% 9% 1	540
	11th to 20th	Night	25% 3 24% 33% 12% 2	531
	21st to end	Night	11% 3 21% 39% 23% 3	584
June	1st to 10th	Night	11% 3 22% 44% 19% 2	540
	11th to 20th	Night	13% 3 19% 42% 22% 1	540
	21st to end	Night	12% 2 20% 41% 22% 3	540
July	1st to 10th	Night	11% 13% 42% 29% 5%	525
	11th to 20th	Night	11% 1 14% 39% 29% 5%	522
	21st to end	Night	9% 1 13% 42% 31% 3	591
August	1st to 10th	Night	9% 1 8% 47% 30% 5%	537
	11th to 20th	Night	11% 2 10% 40% 31% 6%	534
	21st to end	Night	8% 2 12% 39% 33% 6%	594
September	1st to 10th	Night	15% 2 14% 35% 28% 6%	692
	11th to 20th	Night	13% 2 13% 33% 33% 6%	720
	21st to end	Night	17% 4 21% 33% 21% 4	720
October	1st to 10th	Night	14% 3 25% 35% 19% 4	720
	11th to 20th	Night	23% 8% 30% 29% 9% 1	720
	21st to end	Night	28% 9% 30% 25% 8%	792
November	1st to 10th	Night	19% 7% 32% 28% 12% 1	740
	11th to 20th	Night	23% 13% 31% 24% 7% 1	760
	21st to end	Night	25% 11% 33% 24% 6% 1	760
December	1st to 10th	Night	28% 13% 32% 22% 4	760
	11th to 20th	Night	26% 11% 35% 23% 4 1	760
	21st to end	Night	30% 13% 33% 21% 3	836

Page generated at 2024-01-12 07:31:48. Version ac07

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