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 2024-12-02.

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	14% 11% 4 9% 5% 5% 5% 4 6% 7% 31%	102045
	Night	15% 11% 4 9% 5% 4 4 4 5% 6% 33%	97548
Transparency	Day	50% 5% 11% 21% 12% 1	105720
	Night	49% 5% 10% 21% 13% 2	102013
Seeing	Day	20% 9% 27% 23% 14% 6%	15369
	Night	20% 8% 28% 29% 13% 2	25002

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% 9% 17% 6% 5% 4 3 5% 5% 11%	2836
	11th to 20th	Day	14% 22% 7% 12% 5% 6% 9% 3 4 4 12%	2840
	21st to end	Day	24% 21% 10% 14% 6% 5% 3 3 2 3 9%	3124
February	1st to 10th	Day	18% 17% 5% 10% 8% 5% 4 3 4 5% 21%	1710
	11th to 20th	Day	15% 13% 6% 14% 7% 4 5% 3 5% 6% 23%	1801
	21st to end	Day	18% 14% 5% 10% 5% 6% 4 4 5% 5% 26%	1570
March	1st to 10th	Day	20% 14% 7% 11% 5% 4 4 3 4 6% 21%	3269
	11th to 20th	Day	11% 13% 5% 10% 5% 4 4 3 4 7% 32%	3480
	21st to end	Day	20% 12% 5% 11% 5% 4 4 3 4 6% 27%	3815
April	1st to 10th	Day	14% 15% 4 9% 6% 4 4 3 6% 7% 29%	2137
	11th to 20th	Day	16% 11% 3 7% 5% 4 4 3 5% 6% 35%	2413
	21st to end	Day	19% 10% 3 8% 5% 4 5% 4 5% 7% 31%	2470
May	1st to 10th	Day	19% 11% 3 8% 5% 5% 5% 4 5% 6% 29%	4082
	11th to 20th	Day	21% 8% 3 7% 5% 4 3 3 6% 7% 34%	4081
	21st to end	Day	11% 6% 2 7% 6% 6% 6% 5% 7% 9% 36%	4476
June	1st to 10th	Day	12% 7% 2 7% 6% 5% 5% 4 7% 9% 36%	2470
	11th to 20th	Day	12% 8% 2 7% 5% 5% 5% 5% 6% 9% 36%	2565
	21st to end	Day	11% 6% 2 7% 6% 5% 6% 5% 7% 10% 37%	2660
July	1st to 10th	Day	10% 7% 3 7% 5% 5% 5% 4 6% 10% 37%	4440
	11th to 20th	Day	9% 5% 2 5% 4 5% 5% 5% 8% 11% 40%	4120
	21st to end	Day	10% 6% 2 7% 5% 5% 5% 5% 7% 9% 37%	4466
August	1st to 10th	Day	9% 6% 3 8% 6% 5% 5% 5% 7% 10% 36%	4104
	11th to 20th	Day	9% 6% 3 7% 5% 5% 6% 5% 8% 11% 37%	4044
	21st to end	Day	7% 5% 2 7% 5% 5% 6% 5% 7% 10% 41%	4500
September	1st to 10th	Day	13% 6% 2 5% 5% 4 4 4 5% 7% 46%	2100
	11th to 20th	Day	9% 7% 2 5% 5% 4 4 4 6% 9% 44%	2090
	21st to end	Day	20% 7% 2 7% 4 3 3 3 5% 5% 41%	2090
October	1st to 10th	Day	14% 8% 2 6% 4 3 3 3 5% 8% 42%	2024
	11th to 20th	Day	14% 9% 3 7% 4 4 6% 4 5% 7% 37%	1900
	21st to end	Day	19% 13% 3 6% 5% 5% 5% 3 5% 6% 29%	2023
November	1st to 10th	Day	11% 10% 2 7% 4 4 4 4 5% 7% 41%	1762
	11th to 20th	Day	17% 14% 5% 7% 5% 4 4 3 4 6% 31%	1800
	21st to end	Day	17% 18% 6% 9% 5% 4 3 3 5% 6% 25%	1800
December	1st to 10th	Day	17% 19% 8% 13% 7% 4 4 3 3 5% 18%	1706
	11th to 20th	Day	16% 16% 7% 13% 5% 4 5% 4 4 6% 19%	2153
	21st to end	Day	22% 25% 9% 12% 5% 4 4 3 3 4 10%	3124
January	1st to 10th	Night	14% 22% 8% 16% 6% 4 4 3 4 4 16%	4109
	11th to 20th	Night	13% 19% 9% 18% 7% 5% 6% 5% 3 3 13%	4120
	21st to end	Night	25% 21% 7% 14% 5% 3 3 2 3 3 13%	4532
February	1st to 10th	Night	20% 14% 6% 11% 6% 4 4 4 4 5% 23%	2470
	11th to 20th	Night	15% 13% 5% 11% 8% 5% 5% 3 5% 5% 25%	2261
	21st to end	Night	19% 14% 5% 12% 6% 5% 4 3 4 4 25%	1884
March	1st to 10th	Night	18% 15% 6% 8% 5% 3 3 3 3 5% 30%	3583
	11th to 20th	Night	13% 10% 3 8% 4 4 4 4 5% 7% 39%	3480
	21st to end	Night	17% 9% 3 9% 5% 4 4 3 5% 6% 36%	3817
April	1st to 10th	Night	15% 12% 3 7% 5% 4 4 5% 5% 7% 32%	2058
	11th to 20th	Night	16% 8% 3 7% 5% 5% 4 3 6% 7% 36%	1716
	21st to end	Night	14% 10% 3 7% 5% 5% 4 4 6% 6% 36%	1710
May	1st to 10th	Night	23% 11% 3 8% 5% 5% 4 3 5% 6% 27%	2813
	11th to 20th	Night	17% 9% 2 7% 4 3 3 3 6% 7% 38%	2812
	21st to end	Night	10% 5% 2 5% 4 4 4 4 7% 9% 44%	3079
June	1st to 10th	Night	9% 8% 2 6% 5% 5% 5% 4 5% 7% 45%	1710
	11th to 20th	Night	9% 5% 2 5% 4 4 6% 6% 8% 9% 43%	1607
	21st to end	Night	9% 5% 2 7% 5% 3 4 4 6% 10% 43%	1520
July	1st to 10th	Night	10% 5% 2 6% 4 5% 4 4 6% 8% 45%	2530
	11th to 20th	Night	9% 3 2 5% 4 5% 5% 4 7% 9% 48%	2835
	21st to end	Night	7% 6% 2 6% 5% 5% 4 5% 7% 9% 43%	3087
August	1st to 10th	Night	9% 7% 3 7% 5% 5% 5% 5% 6% 11% 36%	2825
	11th to 20th	Night	10% 9% 3 7% 5% 4 3 4 5% 7% 43%	2785
	21st to end	Night	5% 4 2 5% 4 5% 6% 4 6% 8% 51%	3151
September	1st to 10th	Night	11% 6% 2 5% 4 3 4 4 5% 6% 51%	2061
	11th to 20th	Night	10% 6% 2 4 3 3 4 3 5% 7% 55%	2090
	21st to end	Night	15% 8% 2 6% 4 3 3 3 6% 6% 43%	2090
October	1st to 10th	Night	10% 5% 2 5% 4 4 5% 4 5% 7% 48%	2154
	11th to 20th	Night	16% 9% 3 7% 4 4 4 2 4 6% 40%	2280
	21st to end	Night	21% 9% 3 6% 4 4 4 4 5% 6% 34%	2574
November	1st to 10th	Night	13% 9% 2 7% 4 4 4 3 5% 7% 43%	2536
	11th to 20th	Night	16% 12% 5% 8% 5% 3 4 2 5% 7% 33%	2600
	21st to end	Night	18% 15% 4 9% 5% 4 4 4 5% 6% 26%	2600
December	1st to 10th	Night	18% 17% 6% 11% 6% 4 4 3 4 6% 20%	2495
	11th to 20th	Night	17% 16% 7% 11% 5% 4 3 3 5% 5% 24%	3042
	21st to end	Night	21% 21% 9% 11% 5% 4 4 3 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	75% 5% 6% 11% 3	2837
	11th to 20th	Day	77% 4 7% 9% 4	2840
	21st to end	Day	83% 3 4 7% 3 1	3124
February	1st to 10th	Day	66% 4 9% 14% 7% 1	1710
	11th to 20th	Day	63% 4 7% 17% 9% 1	1811
	21st to end	Day	61% 4 11% 15% 7% 2	1570
March	1st to 10th	Day	65% 4 8% 18% 5%	3269
	11th to 20th	Day	52% 6% 9% 25% 8% 1	3480
	21st to end	Day	58% 6% 10% 19% 7%	3815
April	1st to 10th	Day	54% 4 13% 18% 11% 1	2137
	11th to 20th	Day	50% 5% 11% 18% 13% 2	2413
	21st to end	Day	52% 5% 10% 21% 11% 2	2470
May	1st to 10th	Day	54% 6% 11% 21% 7% 1	4120
	11th to 20th	Day	49% 6% 12% 24% 8% 1	4085
	21st to end	Day	40% 8% 13% 21% 14% 4	4489
June	1st to 10th	Day	43% 6% 11% 25% 14% 1	2470
	11th to 20th	Day	43% 6% 13% 23% 14% 1	2565
	21st to end	Day	39% 8% 14% 21% 15% 3	2660
July	1st to 10th	Day	42% 5% 11% 22% 17% 2	4371
	11th to 20th	Day	34% 7% 13% 25% 19% 2	4051
	21st to end	Day	40% 7% 13% 18% 19% 3	4324
August	1st to 10th	Day	41% 7% 15% 23% 14% 1	4091
	11th to 20th	Day	38% 6% 12% 30% 13% 1	4083
	21st to end	Day	36% 6% 14% 29% 12% 3	4499
September	1st to 10th	Day	38% 5% 11% 23% 19% 4	2100
	11th to 20th	Day	37% 5% 11% 26% 19% 3	2090
	21st to end	Day	45% 5% 9% 21% 19% 1	2090
October	1st to 10th	Day	29% 4 12% 32% 22% 1	3362
	11th to 20th	Day	40% 4 9% 24% 20% 2	3140
	21st to end	Day	44% 4 11% 22% 18% 1	3312
November	1st to 10th	Day	42% 5% 10% 24% 17% 2	1762
	11th to 20th	Day	56% 3 8% 20% 11% 2	1800
	21st to end	Day	61% 3 10% 16% 9% 1	1800
December	1st to 10th	Day	70% 3 8% 14% 4 1	1706
	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	72% 4 6% 12% 5%	4109
	11th to 20th	Night	76% 4 7% 9% 3	4120
	21st to end	Night	77% 2 6% 11% 3 1	4532
February	1st to 10th	Night	64% 4 9% 15% 7% 1	2470
	11th to 20th	Night	60% 5% 8% 17% 9% 1	2262
	21st to end	Night	63% 4 8% 15% 9% 2	1884
March	1st to 10th	Night	57% 4 9% 20% 9% 1	3583
	11th to 20th	Night	43% 6% 11% 27% 11% 2	3480
	21st to end	Night	49% 5% 9% 26% 11% 1	3817
April	1st to 10th	Night	50% 5% 12% 17% 15% 2	2058
	11th to 20th	Night	47% 5% 10% 18% 17% 3	1716
	21st to end	Night	47% 5% 11% 20% 15% 2	1710
May	1st to 10th	Night	56% 6% 9% 19% 9% 2	2840
	11th to 20th	Night	44% 6% 11% 24% 12% 2	2813
	21st to end	Night	32% 7% 13% 29% 16% 3	3087
June	1st to 10th	Night	39% 5% 11% 25% 18% 2	1710
	11th to 20th	Night	34% 8% 15% 25% 16% 3	1607
	21st to end	Night	36% 6% 14% 25% 15% 4	1520
July	1st to 10th	Night	36% 5% 12% 25% 16% 6%	2490
	11th to 20th	Night	30% 6% 13% 31% 18% 1	2782
	21st to end	Night	35% 5% 15% 21% 20% 3	2988
August	1st to 10th	Night	41% 6% 14% 23% 14% 1	2814
	11th to 20th	Night	40% 5% 10% 27% 18% 1	2812
	21st to end	Night	30% 6% 13% 31% 16% 3	3151
September	1st to 10th	Night	34% 5% 12% 26% 17% 6%	2061
	11th to 20th	Night	30% 4 10% 28% 26% 3	2090
	21st to end	Night	40% 5% 10% 22% 22% 2	2090
October	1st to 10th	Night	26% 4 7% 31% 31% 2	3596
	11th to 20th	Night	36% 3 9% 26% 21% 4	3779
	21st to end	Night	38% 3 8% 28% 19% 4	4235
November	1st to 10th	Night	42% 4 10% 23% 18% 3	2536
	11th to 20th	Night	52% 3 9% 21% 13% 3	2600
	21st to end	Night	59% 4 12% 17% 8% 1	2600
December	1st to 10th	Night	66% 4 7% 16% 7%	2495
	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% 16% 43% 9% 5%	270
	21st to end	Day	29% 17% 32% 19% 3	297
February	1st to 10th	Day	29% 17% 36% 16% 2	270
	11th to 20th	Day	25% 21% 34% 17% 2	270
	21st to end	Day	27% 24% 36% 12% 1	225
March	1st to 10th	Day	25% 16% 35% 19% 4	354
	11th to 20th	Day	24% 15% 36% 19% 4 1	460
	21st to end	Day	30% 13% 31% 22% 5% 1	506
April	1st to 10th	Day	23% 12% 35% 20% 8% 2	460
	11th to 20th	Day	21% 17% 29% 20% 9% 4	452
	21st to end	Day	26% 11% 34% 20% 7% 2	460
May	1st to 10th	Day	29% 6% 30% 23% 9% 3	463
	11th to 20th	Day	23% 6% 29% 24% 13% 6%	487
	21st to end	Day	12% 5% 26% 28% 21% 9%	529
June	1st to 10th	Day	16% 5% 21% 34% 18% 5%	490
	11th to 20th	Day	16% 5% 23% 29% 22% 5%	585
	21st to end	Day	14% 6% 27% 29% 17% 6%	680
July	1st to 10th	Day	14% 3 18% 27% 23% 15%	671
	11th to 20th	Day	12% 2 20% 30% 23% 13%	484
	21st to end	Day	13% 3 19% 25% 27% 13%	532
August	1st to 10th	Day	12% 3 14% 28% 28% 15%	486
	11th to 20th	Day	15% 2 18% 29% 25% 11%	479
	21st to end	Day	12% 2 15% 29% 27% 14%	539
September	1st to 10th	Day	15% 2 18% 26% 26% 13%	490
	11th to 20th	Day	11% 2 13% 27% 30% 18%	490
	21st to end	Day	22% 8% 18% 26% 19% 9%	490
October	1st to 10th	Day	14% 5% 26% 28% 19% 8%	490
	11th to 20th	Day	16% 12% 33% 24% 11% 3	490
	21st to end	Day	29% 10% 32% 22% 6% 1	472
November	1st to 10th	Day	16% 15% 35% 21% 10% 3	300
	11th to 20th	Day	25% 15% 32% 18% 9% 1	300
	21st to end	Day	27% 15% 39% 16% 2	300
December	1st to 10th	Day	24% 20% 35% 15% 5% 2	261
	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% 15% 36% 17% 3 1	760
	21st to end	Night	25% 14% 35% 21% 4	836
February	1st to 10th	Night	27% 10% 40% 20% 3	760
	11th to 20th	Night	24% 15% 35% 23% 3	743
	21st to end	Night	28% 12% 40% 18% 3	628
March	1st to 10th	Night	24% 12% 33% 24% 7%	760
	11th to 20th	Night	21% 12% 36% 24% 6% 1	760
	21st to end	Night	25% 9% 33% 26% 7%	836
April	1st to 10th	Night	23% 10% 35% 27% 5% 1	728
	11th to 20th	Night	21% 9% 35% 23% 10% 2	563
	21st to end	Night	21% 5% 38% 26% 7% 1	570
May	1st to 10th	Night	24% 5% 31% 31% 9% 1	570
	11th to 20th	Night	24% 3 25% 33% 13% 2	561
	21st to end	Night	11% 2 21% 40% 22% 3	617
June	1st to 10th	Night	11% 3 23% 43% 18% 2	570
	11th to 20th	Night	12% 3 19% 43% 22% 1	570
	21st to end	Night	12% 2 21% 41% 22% 2	570
July	1st to 10th	Night	12% 1 13% 42% 28% 5%	555
	11th to 20th	Night	11% 1 15% 40% 28% 5%	552
	21st to end	Night	9% 1 13% 43% 31% 3	624
August	1st to 10th	Night	10% 1 9% 47% 29% 4	567
	11th to 20th	Night	12% 2 10% 41% 29% 5%	564
	21st to end	Night	7% 2 12% 40% 33% 6%	627
September	1st to 10th	Night	14% 3 14% 36% 27% 6%	731
	11th to 20th	Night	12% 2 13% 35% 33% 5%	760
	21st to end	Night	19% 4 21% 32% 19% 4	760
October	1st to 10th	Night	13% 3 26% 35% 19% 4	760
	11th to 20th	Night	22% 8% 30% 29% 10% 2	760
	21st to end	Night	27% 9% 30% 25% 9%	836
November	1st to 10th	Night	19% 7% 33% 29% 12% 1	780
	11th to 20th	Night	23% 13% 32% 24% 7% 1	800
	21st to end	Night	26% 12% 33% 24% 5% 1	800
December	1st to 10th	Night	28% 13% 32% 23% 4	768
	11th to 20th	Night	26% 11% 35% 23% 4 1	760
	21st to end	Night	30% 13% 33% 21% 3	836

Page generated at 2024-11-29 10:43:10. Version ac07

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