Kyle
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kyle clear sky chart from 2005-11-06 to 2024-12-06.

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 5% 4 4 4 4 5% 7% 45%	101320
	Night	14% 6% 2 5% 3 3 3 3 5% 7% 50%	98509
Transparency	Day	36% 5% 10% 21% 19% 9%	105126
	Night	34% 5% 11% 20% 19% 11%	102830
Seeing	Day	13% 6% 18% 27% 26% 9%	14914
	Night	16% 6% 23% 36% 18% 2	24859

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	15% 8% 2 5% 3 3 3 2 4 6% 49%	2847
	11th to 20th	Day	18% 4 1 3 2 2 2 2 4 5% 55%	2850
	21st to end	Day	19% 7% 2 5% 4 3 3 2 4 8% 42%	3327
February	1st to 10th	Day	22% 6% 2 5% 3 4 3 3 4 4 44%	1900
	11th to 20th	Day	19% 8% 2 4 3 3 3 3 5% 6% 44%	1849
	21st to end	Day	18% 7% 2 4 4 3 3 2 4 5% 47%	1570
March	1st to 10th	Day	16% 7% 3 7% 4 4 4 3 5% 5% 42%	3426
	11th to 20th	Day	21% 10% 3 8% 5% 5% 5% 3 4 5% 32%	3480
	21st to end	Day	17% 8% 2 4 4 3 4 3 4 7% 45%	3814
April	1st to 10th	Day	16% 8% 2 5% 4 4 5% 3 5% 6% 42%	2090
	11th to 20th	Day	19% 6% 2 6% 4 4 4 3 5% 5% 41%	2066
	21st to end	Day	15% 7% 2 5% 5% 5% 4 2 5% 6% 44%	2403
May	1st to 10th	Day	24% 9% 3 8% 5% 4 4 4 5% 5% 30%	4082
	11th to 20th	Day	15% 7% 3 7% 4 4 5% 3 5% 6% 42%	4082
	21st to end	Day	11% 6% 2 7% 5% 6% 6% 5% 7% 10% 35%	4477
June	1st to 10th	Day	6% 4 2 5% 4 4 6% 4 8% 9% 47%	2470
	11th to 20th	Day	7% 5% 2 6% 5% 5% 5% 5% 7% 10% 44%	2470
	21st to end	Day	6% 7% 2 6% 6% 6% 7% 5% 8% 9% 37%	2470
July	1st to 10th	Day	7% 4 2 5% 5% 5% 5% 4 6% 8% 48%	4120
	11th to 20th	Day	5% 4 2 5% 5% 5% 5% 5% 8% 11% 45%	4120
	21st to end	Day	12% 6% 2 6% 5% 5% 5% 5% 7% 11% 36%	4465
August	1st to 10th	Day	1 2 1 2 2 3 3 3 5% 9% 69%	4104
	11th to 20th	Day	3 2 1 3 3 3 4 4 8% 11% 58%	3764
	21st to end	Day	5% 3 2 5% 4 6% 5% 4 7% 12% 47%	3967
September	1st to 10th	Day	8% 6% 3 7% 6% 6% 6% 4 5% 5% 44%	2090
	11th to 20th	Day	11% 7% 3 7% 4 5% 5% 5% 6% 8% 41%	2090
	21st to end	Day	8% 4 1 4 5% 5% 6% 4 7% 7% 49%	2090
October	1st to 10th	Day	6% 4 2 5% 4 4 4 3 5% 7% 55%	2090
	11th to 20th	Day	12% 5% 1 5% 3 4 4 3 5% 6% 52%	1948
	21st to end	Day	11% 4 2 5% 3 3 3 3 4 5% 57%	2090
November	1st to 10th	Day	13% 8% 3 6% 4 3 4 3 5% 6% 45%	1958
	11th to 20th	Day	13% 5% 2 5% 4 3 4 3 5% 5% 51%	1900
	21st to end	Day	17% 8% 2 5% 4 4 3 3 4 5% 45%	1800
December	1st to 10th	Day	16% 7% 3 5% 4 3 3 4 5% 6% 45%	1755
	11th to 20th	Day	17% 7% 2 6% 4 4 4 3 5% 5% 43%	2161
	21st to end	Day	17% 6% 2 4 2 2 3 2 4 4 53%	3135
January	1st to 10th	Night	21% 6% 2 3 2 2 2 2 3 6% 52%	4108
	11th to 20th	Night	14% 4 1 3 2 2 2 2 3 4 64%	4120
	21st to end	Night	22% 7% 2 5% 4 3 3 2 4 6% 42%	4368
February	1st to 10th	Night	19% 7% 2 5% 3 3 3 3 5% 5% 46%	2280
	11th to 20th	Night	21% 7% 2 4 2 2 3 2 3 5% 49%	2218
	21st to end	Night	21% 6% 2 4 3 3 3 2 5% 5% 44%	1884
March	1st to 10th	Night	21% 8% 2 5% 4 4 5% 3 4 6% 38%	3426
	11th to 20th	Night	23% 10% 3 7% 5% 4 4 3 5% 5% 32%	3480
	21st to end	Night	17% 8% 2 6% 4 3 4 3 4 5% 43%	3817
April	1st to 10th	Night	15% 7% 2 4 4 4 4 3 5% 7% 45%	2090
	11th to 20th	Night	19% 6% 2 5% 4 4 4 3 5% 6% 43%	2063
	21st to end	Night	17% 8% 2 6% 4 3 3 2 3 6% 46%	1768
May	1st to 10th	Night	27% 9% 3 5% 3 3 3 3 4 5% 35%	2823
	11th to 20th	Night	14% 5% 2 5% 4 3 4 3 5% 6% 49%	2823
	21st to end	Night	14% 7% 2 5% 3 4 4 4 6% 9% 42%	3090
June	1st to 10th	Night	6% 3 2 3 3 3 3 3 6% 9% 60%	1710
	11th to 20th	Night	5% 3 2 4 3 4 4 3 6% 10% 56%	1710
	21st to end	Night	7% 4 2 5% 4 4 5% 4 7% 9% 50%	1710
July	1st to 10th	Night	6% 4 1 4 4 3 4 4 6% 10% 55%	2850
	11th to 20th	Night	5% 3 2 5% 4 4 4 4 6% 11% 53%	2850
	21st to end	Night	12% 6% 2 6% 4 4 4 4 6% 9% 41%	3098
August	1st to 10th	Night	2 2 1 2 2 2 2 2 5% 8% 74%	2836
	11th to 20th	Night	3 2 1 3 3 3 4 4 7% 12% 58%	3071
	21st to end	Night	6% 3 1 4 3 3 4 3 7% 11% 55%	3690
September	1st to 10th	Night	8% 5% 2 6% 4 4 5% 3 5% 8% 50%	2090
	11th to 20th	Night	10% 5% 2 5% 4 4 5% 4 6% 7% 46%	2090
	21st to end	Night	7% 4 2 4 3 4 4 4 7% 7% 52%	2090
October	1st to 10th	Night	6% 3 1 4 3 3 4 3 5% 7% 61%	2090
	11th to 20th	Night	14% 5% 2 4 3 3 3 3 4 6% 53%	2213
	21st to end	Night	14% 5% 2 4 2 2 2 2 3 4 60%	2508
November	1st to 10th	Night	15% 6% 2 4 3 3 3 3 4 5% 51%	2340
	11th to 20th	Night	11% 5% 2 5% 4 3 3 3 4 6% 55%	2495
	21st to end	Night	18% 6% 2 4 3 3 4 2 5% 6% 47%	2600
December	1st to 10th	Night	15% 7% 2 5% 4 3 3 3 4 5% 49%	2542
	11th to 20th	Night	17% 9% 3 5% 3 3 3 2 4 5% 46%	3036
	21st to end	Night	20% 6% 2 3 2 2 2 2 3 5% 53%	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	38% 3 3 17% 25% 14%	2848
	11th to 20th	Day	33% 2 7% 16% 27% 15%	2850
	21st to end	Day	42% 3 4 12% 29% 11%	3327
February	1st to 10th	Day	44% 4 5% 12% 21% 15%	1900
	11th to 20th	Day	42% 4 7% 17% 19% 12%	1859
	21st to end	Day	41% 4 6% 17% 17% 15%	1570
March	1st to 10th	Day	44% 5% 6% 16% 20% 9%	3426
	11th to 20th	Day	55% 4 7% 9% 16% 8%	3480
	21st to end	Day	40% 4 8% 16% 22% 9%	3814
April	1st to 10th	Day	44% 5% 7% 16% 15% 13%	2090
	11th to 20th	Day	44% 4 7% 15% 19% 11%	2066
	21st to end	Day	42% 4 6% 20% 19% 9%	2403
May	1st to 10th	Day	54% 6% 9% 13% 13% 5%	4120
	11th to 20th	Day	42% 6% 8% 18% 20% 6%	4086
	21st to end	Day	40% 7% 13% 28% 11% 1	4489
June	1st to 10th	Day	31% 6% 13% 27% 19% 4	2470
	11th to 20th	Day	34% 7% 12% 26% 17% 5%	2470
	21st to end	Day	39% 8% 11% 24% 15% 3	2470
July	1st to 10th	Day	31% 7% 17% 37% 6% 1	4056
	11th to 20th	Day	30% 7% 18% 29% 16% 1	4051
	21st to end	Day	38% 8% 17% 28% 8%	4325
August	1st to 10th	Day	13% 4 12% 43% 26% 1	4090
	11th to 20th	Day	20% 6% 23% 38% 11% 2	3801
	21st to end	Day	28% 9% 20% 24% 17% 2	3966
September	1st to 10th	Day	40% 6% 9% 21% 16% 8%	2090
	11th to 20th	Day	39% 8% 11% 19% 18% 5%	2090
	21st to end	Day	31% 7% 11% 20% 17% 13%	2090
October	1st to 10th	Day	18% 3 6% 12% 23% 37%	3480
	11th to 20th	Day	22% 4 8% 19% 27% 20%	3214
	21st to end	Day	27% 4 5% 19% 31% 15%	3428
November	1st to 10th	Day	40% 5% 8% 18% 18% 11%	1958
	11th to 20th	Day	35% 4 8% 17% 21% 15%	1900
	21st to end	Day	42% 4 6% 16% 19% 14%	1800
December	1st to 10th	Day	40% 4 8% 19% 21% 8%	1755
	11th to 20th	Day	43% 4 7% 11% 21% 13%	2159
	21st to end	Day	36% 3 5% 16% 27% 14%	3135
January	1st to 10th	Night	36% 3 5% 15% 22% 18%	4108
	11th to 20th	Night	27% 2 4 17% 32% 18%	4120
	21st to end	Night	45% 3 4 12% 25% 11%	4368
February	1st to 10th	Night	41% 4 6% 12% 19% 17%	2280
	11th to 20th	Night	40% 3 6% 16% 20% 15%	2218
	21st to end	Night	42% 4 6% 16% 16% 16%	1884
March	1st to 10th	Night	46% 5% 7% 16% 17% 9%	3426
	11th to 20th	Night	55% 4 9% 10% 13% 9%	3480
	21st to end	Night	42% 5% 9% 14% 20% 9%	3817
April	1st to 10th	Night	38% 6% 8% 18% 16% 14%	2090
	11th to 20th	Night	42% 4 9% 13% 16% 15%	2063
	21st to end	Night	41% 4 9% 20% 17% 9%	1768
May	1st to 10th	Night	52% 4 9% 17% 13% 6%	2850
	11th to 20th	Night	36% 7% 10% 22% 18% 7%	2824
	21st to end	Night	37% 6% 15% 29% 12% 1	3099
June	1st to 10th	Night	22% 5% 17% 30% 23% 3	1710
	11th to 20th	Night	24% 6% 15% 31% 20% 5%	1710
	21st to end	Night	30% 7% 18% 27% 16% 3	1710
July	1st to 10th	Night	24% 8% 23% 38% 6% 1	2805
	11th to 20th	Night	26% 8% 20% 31% 14% 1	2796
	21st to end	Night	37% 7% 23% 26% 6%	2999
August	1st to 10th	Night	10% 5% 17% 46% 22% 1	2826
	11th to 20th	Night	19% 7% 31% 31% 10% 2	3100
	21st to end	Night	23% 11% 21% 27% 15% 2	3690
September	1st to 10th	Night	32% 7% 16% 22% 15% 8%	2090
	11th to 20th	Night	36% 8% 14% 22% 15% 6%	2090
	21st to end	Night	29% 6% 15% 20% 17% 13%	2090
October	1st to 10th	Night	18% 3 7% 16% 19% 37%	3480
	11th to 20th	Night	21% 3 9% 17% 29% 20%	3673
	21st to end	Night	26% 3 6% 20% 30% 16%	4120
November	1st to 10th	Night	36% 5% 8% 18% 20% 14%	2340
	11th to 20th	Night	32% 5% 8% 18% 21% 16%	2495
	21st to end	Night	39% 3 8% 17% 18% 15%	2600
December	1st to 10th	Night	39% 3 7% 21% 19% 11%	2542
	11th to 20th	Night	43% 3 5% 11% 21% 17%	3037
	21st to end	Night	37% 3 4 14% 29% 13%	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	19% 12% 33% 27% 9% 1	270
	11th to 20th	Day	23% 13% 27% 25% 10% 1	270
	21st to end	Day	19% 10% 35% 26% 9% 1	297
February	1st to 10th	Day	29% 9% 32% 19% 11%	270
	11th to 20th	Day	24% 14% 34% 21% 7%	270
	21st to end	Day	27% 11% 38% 22% 3	225
March	1st to 10th	Day	21% 13% 34% 24% 7%	270
	11th to 20th	Day	18% 14% 37% 22% 7% 1	270
	21st to end	Day	19% 11% 34% 29% 7% 1	297
April	1st to 10th	Day	21% 12% 34% 23% 9%	270
	11th to 20th	Day	21% 13% 32% 23% 11%	264
	21st to end	Day	16% 12% 35% 26% 10% 1	583
May	1st to 10th	Day	18% 8% 31% 30% 12%	653
	11th to 20th	Day	18% 5% 25% 31% 18% 2	675
	21st to end	Day	16% 5% 21% 33% 23% 2	734
June	1st to 10th	Day	8% 2 10% 37% 33% 9%	680
	11th to 20th	Day	8% 2 9% 44% 30% 7%	680
	21st to end	Day	8% 3 9% 31% 36% 14%	680
July	1st to 10th	Day	8% 4 7% 28% 38% 16%	671
	11th to 20th	Day	4 1 4 24% 53% 14%	668
	21st to end	Day	5% 1 4 27% 46% 17%	739
August	1st to 10th	Day	4 1 2 21% 53% 19%	676
	11th to 20th	Day	6% 1 2 24% 48% 19%	503
	21st to end	Day	6% 1 5% 19% 37% 34%	417
September	1st to 10th	Day	9% 2 4 21% 40% 25%	300
	11th to 20th	Day	7% 1 2 23% 41% 26%	300
	21st to end	Day	10% 1 6% 22% 36% 25%	300
October	1st to 10th	Day	4 2 8% 30% 40% 15%	300
	11th to 20th	Day	12% 2 14% 34% 28% 11%	300
	21st to end	Day	16% 9% 21% 26% 18% 9%	330
November	1st to 10th	Day	17% 9% 21% 29% 19% 5%	300
	11th to 20th	Day	18% 6% 23% 28% 21% 3	300
	21st to end	Day	18% 14% 31% 22% 12% 3	300
December	1st to 10th	Day	21% 5% 31% 27% 11% 6%	285
	11th to 20th	Day	22% 12% 29% 26% 10% 1	270
	21st to end	Day	21% 8% 31% 27% 12% 1	297
January	1st to 10th	Night	21% 7% 29% 33% 9% 1	950
	11th to 20th	Night	21% 8% 30% 33% 8%	950
	21st to end	Night	22% 9% 28% 33% 8%	946
February	1st to 10th	Night	25% 9% 29% 30% 7%	760
	11th to 20th	Night	25% 9% 34% 28% 4	744
	21st to end	Night	25% 12% 39% 21% 2	628
March	1st to 10th	Night	22% 10% 36% 28% 4	577
	11th to 20th	Night	22% 9% 33% 31% 5%	570
	21st to end	Night	17% 9% 39% 30% 4	627
April	1st to 10th	Night	17% 7% 41% 31% 5%	570
	11th to 20th	Night	20% 9% 40% 27% 4	563
	21st to end	Night	20% 8% 36% 28% 8% 1	570
May	1st to 10th	Night	20% 6% 38% 30% 6%	570
	11th to 20th	Night	17% 3 31% 37% 12%	561
	21st to end	Night	13% 4 30% 37% 15%	617
June	1st to 10th	Night	6% 2 17% 48% 26% 1	570
	11th to 20th	Night	5% 2 24% 52% 15% 2	570
	21st to end	Night	6% 3 12% 46% 28% 4	570
July	1st to 10th	Night	9% 2 7% 47% 32% 3	555
	11th to 20th	Night	3 1 9% 48% 35% 3	552
	21st to end	Night	4 1 6% 49% 37% 4	624
August	1st to 10th	Night	2 7% 48% 39% 4	567
	11th to 20th	Night	5% 1 5% 49% 35% 4	564
	21st to end	Night	6% 1 5% 34% 48% 6%	627
September	1st to 10th	Night	9% 2 6% 37% 41% 5%	570
	11th to 20th	Night	12% 3 5% 34% 43% 3	570
	21st to end	Night	8% 2 11% 34% 42% 3	570
October	1st to 10th	Night	6% 2 8% 44% 35% 4	570
	11th to 20th	Night	14% 3 16% 41% 24% 2	693
	21st to end	Night	15% 5% 22% 33% 22% 2	836
November	1st to 10th	Night	17% 5% 17% 39% 21% 1	780
	11th to 20th	Night	13% 5% 26% 38% 17% 1	895
	21st to end	Night	21% 9% 27% 30% 13% 1	1000
December	1st to 10th	Night	20% 7% 25% 35% 12% 1	978
	11th to 20th	Night	24% 8% 26% 34% 8%	950
	21st to end	Night	22% 6% 28% 37% 7%	1045

Page generated at 2024-12-03 05:45:13. Version ac07

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