A Wild Rose Cottage
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the A Wild Rose Cottage clear sky chart from 2005-11-06 to 2025-01-07.

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 4 4 6% 8% 42%	105144
	Night	14% 6% 2 5% 3 3 4 3 5% 7% 47%	104012
Transparency	Day	37% 7% 12% 19% 17% 8%	108887
	Night	35% 6% 12% 20% 18% 10%	108383
Seeing	Day	13% 7% 20% 26% 25% 10%	15012
	Night	15% 7% 23% 34% 19% 2	24987

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% 9% 2 6% 3 3 3 3 4 6% 44%	2901
	11th to 20th	Day	16% 6% 2 4 3 2 2 2 4 6% 52%	2850
	21st to end	Day	24% 9% 3 6% 3 3 3 2 5% 7% 36%	3139
February	1st to 10th	Day	23% 7% 3 6% 4 4 2 3 4 4 40%	1900
	11th to 20th	Day	20% 9% 3 6% 4 3 3 3 4 5% 41%	1849
	21st to end	Day	19% 7% 2 6% 3 3 3 3 4 6% 43%	1657
March	1st to 10th	Day	16% 7% 3 8% 5% 5% 5% 4 6% 7% 34%	3436
	11th to 20th	Day	20% 8% 3 9% 6% 5% 5% 4 5% 5% 30%	3480
	21st to end	Day	17% 7% 2 6% 4 4 4 3 5% 6% 42%	3814
April	1st to 10th	Day	14% 9% 3 6% 5% 5% 5% 3 6% 6% 39%	2090
	11th to 20th	Day	17% 6% 3 7% 5% 5% 4 3 5% 6% 39%	2130
	21st to end	Day	13% 7% 3 6% 4 5% 4 3 6% 6% 44%	2280
May	1st to 10th	Day	19% 6% 2 7% 5% 5% 6% 4 6% 8% 32%	4070
	11th to 20th	Day	14% 6% 2 8% 4 4 5% 4 5% 7% 41%	4082
	21st to end	Day	10% 5% 2 6% 5% 5% 6% 5% 8% 11% 37%	4477
June	1st to 10th	Day	5% 4 2 6% 5% 5% 5% 5% 8% 9% 47%	2470
	11th to 20th	Day	6% 4 2 4 5% 5% 5% 5% 9% 11% 45%	2470
	21st to end	Day	6% 6% 2 7% 6% 6% 8% 6% 9% 11% 33%	2470
July	1st to 10th	Day	9% 4 2 5% 5% 4 5% 5% 7% 11% 44%	4120
	11th to 20th	Day	5% 6% 3 8% 6% 6% 6% 5% 9% 11% 36%	4120
	21st to end	Day	12% 8% 3 7% 6% 5% 6% 5% 8% 10% 30%	4465
August	1st to 10th	Day	1 1 1 3 3 4 4 4 6% 10% 62%	4104
	11th to 20th	Day	3 2 1 4 3 5% 6% 6% 10% 15% 47%	4019
	21st to end	Day	5% 4 2 7% 6% 6% 6% 5% 9% 10% 40%	3835
September	1st to 10th	Day	7% 5% 2 7% 6% 5% 6% 5% 7% 9% 41%	2090
	11th to 20th	Day	10% 7% 3 8% 6% 5% 4 4 6% 6% 40%	2090
	21st to end	Day	8% 5% 2 6% 5% 5% 5% 4 6% 8% 47%	2090
October	1st to 10th	Day	5% 4 2 4 3 4 4 3 5% 8% 57%	2049
	11th to 20th	Day	11% 5% 2 5% 3 3 4 3 4 6% 52%	1900
	21st to end	Day	12% 6% 1 5% 4 2 3 3 4 5% 54%	2090
November	1st to 10th	Day	12% 6% 2 5% 4 4 5% 3 5% 8% 45%	1958
	11th to 20th	Day	11% 6% 2 5% 3 3 4 3 4 7% 52%	2000
	21st to end	Day	16% 7% 2 7% 4 4 4 3 5% 6% 42%	1830
December	1st to 10th	Day	25% 9% 2 6% 4 3 3 3 4 5% 36%	2940
	11th to 20th	Day	17% 8% 3 6% 4 4 3 3 5% 5% 43%	3391
	21st to end	Day	14% 7% 2 5% 4 3 3 3 4 6% 49%	4488
January	1st to 10th	Night	20% 7% 2 4 3 4 3 2 3 5% 47%	4187
	11th to 20th	Night	18% 7% 2 4 2 2 2 2 2 4 56%	4120
	21st to end	Night	24% 7% 2 5% 3 2 3 2 4 6% 40%	4532
February	1st to 10th	Night	21% 9% 4 5% 3 3 2 2 5% 6% 40%	2291
	11th to 20th	Night	22% 8% 2 5% 3 2 2 2 4 5% 45%	2218
	21st to end	Night	23% 8% 2 6% 3 4 3 3 4 4 41%	1795
March	1st to 10th	Night	23% 11% 3 5% 4 3 4 3 5% 7% 33%	3419
	11th to 20th	Night	25% 9% 3 8% 5% 4 4 3 4 5% 30%	3480
	21st to end	Night	17% 7% 2 6% 4 3 4 3 5% 6% 45%	3817
April	1st to 10th	Night	13% 6% 3 5% 4 4 5% 4 6% 8% 43%	2090
	11th to 20th	Night	17% 8% 2 7% 3 3 3 3 5% 6% 43%	1997
	21st to end	Night	16% 6% 3 7% 4 3 3 3 4 7% 45%	1900
May	1st to 10th	Night	24% 8% 2 6% 4 4 4 4 5% 7% 32%	2830
	11th to 20th	Night	14% 7% 2 5% 4 4 4 3 5% 7% 46%	2823
	21st to end	Night	13% 5% 2 6% 4 4 5% 4 7% 10% 40%	3090
June	1st to 10th	Night	6% 3 1 5% 4 3 3 3 6% 10% 57%	1710
	11th to 20th	Night	5% 3 1 4 4 4 4 4 7% 9% 54%	1710
	21st to end	Night	6% 4 2 5% 5% 5% 5% 4 8% 11% 47%	1710
July	1st to 10th	Night	6% 4 1 4 3 3 4 4 7% 11% 52%	2850
	11th to 20th	Night	4 5% 2 6% 5% 4 4 4 6% 11% 49%	2850
	21st to end	Night	8% 8% 3 8% 5% 5% 5% 4 6% 11% 38%	3098
August	1st to 10th	Night	1 1 2 2 2 2 3 6% 10% 71%	2836
	11th to 20th	Night	2 2 1 3 2 3 4 4 8% 12% 59%	2815
	21st to end	Night	3 3 1 4 4 3 6% 4 8% 12% 50%	3816
September	1st to 10th	Night	5% 5% 2 7% 3 5% 5% 5% 6% 9% 50%	2090
	11th to 20th	Night	9% 6% 2 7% 4 4 4 2 6% 9% 46%	2090
	21st to end	Night	8% 4 1 5% 3 4 4 4 6% 7% 54%	2090
October	1st to 10th	Night	5% 4 1 4 2 3 3 2 4 8% 63%	2109
	11th to 20th	Night	10% 5% 1 4 3 3 3 2 4 6% 59%	2280
	21st to end	Night	12% 5% 1 3 3 2 2 2 3 5% 60%	2508
November	1st to 10th	Night	11% 6% 2 5% 4 4 4 3 5% 5% 52%	2340
	11th to 20th	Night	10% 6% 3 5% 3 4 3 3 5% 5% 52%	2400
	21st to end	Night	15% 6% 2 6% 3 3 4 3 5% 7% 47%	2565
December	1st to 10th	Night	23% 11% 4 7% 4 3 3 3 4 5% 34%	4250
	11th to 20th	Night	16% 9% 3 6% 3 3 4 2 4 5% 46%	4816
	21st to end	Night	15% 6% 2 4 3 3 3 3 3 5% 54%	6490

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	42% 4 7% 15% 21% 11%	2902
	11th to 20th	Day	34% 5% 7% 20% 25% 11%	2850
	21st to end	Day	48% 4 4 12% 21% 11%	3139
February	1st to 10th	Day	48% 4 6% 12% 17% 13%	1900
	11th to 20th	Day	47% 4 7% 14% 17% 10%	1859
	21st to end	Day	43% 5% 9% 15% 16% 12%	1657
March	1st to 10th	Day	46% 7% 10% 15% 16% 6%	3436
	11th to 20th	Day	54% 7% 9% 8% 15% 7%	3480
	21st to end	Day	41% 5% 9% 17% 21% 6%	3814
April	1st to 10th	Day	45% 6% 7% 17% 14% 11%	2090
	11th to 20th	Day	45% 6% 8% 14% 18% 10%	2130
	21st to end	Day	41% 6% 8% 19% 19% 7%	2280
May	1st to 10th	Day	47% 9% 12% 17% 10% 5%	4108
	11th to 20th	Day	41% 8% 9% 17% 21% 4	4086
	21st to end	Day	37% 9% 15% 29% 10% 1	4489
June	1st to 10th	Day	31% 8% 15% 27% 17% 2	2470
	11th to 20th	Day	29% 9% 16% 25% 18% 3	2470
	21st to end	Day	40% 11% 16% 23% 9% 1	2470
July	1st to 10th	Day	32% 9% 26% 29% 4	4056
	11th to 20th	Day	37% 10% 19% 22% 11%	4051
	21st to end	Day	45% 10% 19% 22% 4 1	4325
August	1st to 10th	Day	17% 6% 14% 42% 20%	4090
	11th to 20th	Day	22% 10% 30% 30% 6% 1	4058
	21st to end	Day	35% 12% 18% 23% 12% 1	3834
September	1st to 10th	Day	37% 10% 14% 19% 14% 6%	2090
	11th to 20th	Day	41% 9% 12% 17% 17% 4	2090
	21st to end	Day	34% 8% 11% 18% 17% 13%	2090
October	1st to 10th	Day	17% 4 7% 14% 20% 39%	3400
	11th to 20th	Day	21% 4 9% 16% 34% 17%	3140
	21st to end	Day	27% 4 6% 20% 29% 15%	3428
November	1st to 10th	Day	37% 7% 9% 17% 21% 10%	1958
	11th to 20th	Day	33% 5% 10% 16% 21% 15%	2000
	21st to end	Day	44% 5% 8% 15% 17% 12%	1830
December	1st to 10th	Day	52% 3 6% 15% 19% 5%	2940
	11th to 20th	Day	42% 5% 8% 11% 22% 11%	3389
	21st to end	Day	37% 4 6% 16% 25% 13%	4488
January	1st to 10th	Night	39% 5% 7% 16% 18% 15%	4187
	11th to 20th	Night	34% 3 6% 18% 26% 13%	4120
	21st to end	Night	46% 4 5% 14% 21% 11%	4532
February	1st to 10th	Night	46% 4 7% 11% 17% 15%	2291
	11th to 20th	Night	42% 4 7% 16% 17% 13%	2218
	21st to end	Night	47% 4 7% 12% 15% 14%	1795
March	1st to 10th	Night	50% 7% 10% 14% 14% 6%	3419
	11th to 20th	Night	55% 6% 9% 13% 11% 6%	3480
	21st to end	Night	40% 6% 9% 14% 22% 9%	3817
April	1st to 10th	Night	38% 7% 10% 18% 16% 10%	2090
	11th to 20th	Night	42% 5% 10% 15% 15% 14%	1997
	21st to end	Night	40% 5% 9% 20% 18% 8%	1900
May	1st to 10th	Night	51% 8% 10% 17% 9% 5%	2857
	11th to 20th	Night	37% 7% 11% 21% 17% 7%	2824
	21st to end	Night	37% 9% 17% 29% 8% 1	3099
June	1st to 10th	Night	23% 7% 17% 32% 19% 1	1710
	11th to 20th	Night	23% 7% 18% 31% 17% 4	1710
	21st to end	Night	29% 9% 21% 27% 12% 1	1710
July	1st to 10th	Night	25% 8% 32% 31% 4	2805
	11th to 20th	Night	29% 9% 23% 28% 11%	2796
	21st to end	Night	39% 10% 22% 23% 5%	2999
August	1st to 10th	Night	8% 5% 18% 47% 21%	2826
	11th to 20th	Night	16% 8% 33% 35% 7% 1	2842
	21st to end	Night	25% 13% 23% 27% 11% 1	3816
September	1st to 10th	Night	29% 11% 19% 21% 14% 6%	2090
	11th to 20th	Night	34% 8% 15% 24% 14% 5%	2090
	21st to end	Night	27% 8% 14% 21% 18% 13%	2090
October	1st to 10th	Night	15% 3 9% 16% 17% 40%	3512
	11th to 20th	Night	17% 3 8% 21% 32% 20%	3779
	21st to end	Night	22% 3 5% 23% 30% 17%	4120
November	1st to 10th	Night	33% 7% 10% 20% 19% 12%	2340
	11th to 20th	Night	34% 4 10% 18% 20% 14%	2400
	21st to end	Night	39% 4 9% 17% 18% 13%	2565
December	1st to 10th	Night	52% 4 6% 14% 16% 8%	4250
	11th to 20th	Night	42% 4 9% 9% 20% 16%	4817
	21st to end	Night	35% 4 6% 15% 30% 11%	6490

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	26% 9% 36% 24% 6%	288
	11th to 20th	Day	24% 11% 31% 25% 6% 2	270
	21st to end	Day	22% 16% 34% 21% 7% 1	297
February	1st to 10th	Day	29% 16% 29% 19% 8%	270
	11th to 20th	Day	27% 18% 30% 16% 8%	270
	21st to end	Day	26% 19% 37% 16% 3	225
March	1st to 10th	Day	19% 16% 37% 21% 6%	270
	11th to 20th	Day	17% 17% 39% 21% 5% 1	270
	21st to end	Day	20% 15% 35% 23% 7% 1	297
April	1st to 10th	Day	19% 19% 36% 20% 6%	270
	11th to 20th	Day	21% 16% 31% 21% 10% 1	328
	21st to end	Day	18% 9% 33% 26% 13% 1	460
May	1st to 10th	Day	12% 11% 38% 26% 12%	641
	11th to 20th	Day	14% 8% 26% 30% 18% 3	675
	21st to end	Day	11% 5% 24% 36% 21% 3	734
June	1st to 10th	Day	7% 1 12% 35% 35% 10%	680
	11th to 20th	Day	6% 1 13% 39% 33% 9%	680
	21st to end	Day	7% 1 10% 29% 37% 15%	680
July	1st to 10th	Day	7% 2 7% 27% 37% 20%	671
	11th to 20th	Day	4 4 25% 45% 22%	668
	21st to end	Day	4 1 5% 27% 44% 19%	739
August	1st to 10th	Day	2 4 22% 49% 22%	676
	11th to 20th	Day	4 1 5% 20% 47% 23%	656
	21st to end	Day	9% 1 3 18% 31% 39%	337
September	1st to 10th	Day	9% 1 6% 21% 35% 28%	300
	11th to 20th	Day	8% 2 6% 22% 40% 23%	300
	21st to end	Day	9% 2 6% 24% 37% 21%	300
October	1st to 10th	Day	5% 3 10% 34% 36% 13%	300
	11th to 20th	Day	11% 2 18% 34% 24% 11%	300
	21st to end	Day	20% 9% 19% 25% 20% 7%	330
November	1st to 10th	Day	15% 5% 20% 34% 19% 6%	300
	11th to 20th	Day	17% 7% 22% 34% 17% 3	300
	21st to end	Day	20% 14% 31% 21% 12% 3	300
December	1st to 10th	Day	20% 8% 33% 22% 12% 4	300
	11th to 20th	Day	23% 16% 27% 25% 6% 2	300
	21st to end	Day	20% 9% 38% 22% 8% 2	330
January	1st to 10th	Night	21% 10% 30% 30% 8%	981
	11th to 20th	Night	23% 12% 27% 30% 7%	950
	21st to end	Night	22% 10% 30% 31% 6%	1045
February	1st to 10th	Night	26% 12% 31% 27% 5%	771
	11th to 20th	Night	27% 11% 29% 27% 5%	744
	21st to end	Night	25% 14% 38% 20% 3	539
March	1st to 10th	Night	24% 9% 37% 26% 4	570
	11th to 20th	Night	21% 10% 33% 30% 6%	570
	21st to end	Night	17% 9% 41% 27% 5% 1	627
April	1st to 10th	Night	16% 10% 40% 32% 3	570
	11th to 20th	Night	20% 10% 36% 27% 7%	563
	21st to end	Night	16% 11% 37% 27% 7% 1	570
May	1st to 10th	Night	16% 11% 34% 33% 5% 1	570
	11th to 20th	Night	11% 5% 30% 40% 12% 1	561
	21st to end	Night	9% 4 28% 40% 18%	617
June	1st to 10th	Night	6% 2 12% 50% 28% 1	570
	11th to 20th	Night	5% 1 21% 50% 23% 1	570
	21st to end	Night	5% 1 12% 42% 35% 5%	570
July	1st to 10th	Night	7% 1 7% 42% 37% 6%	555
	11th to 20th	Night	4 1 5% 41% 45% 4	552
	21st to end	Night	4 1 6% 41% 44% 5%	624
August	1st to 10th	Night	2 5% 46% 42% 5%	567
	11th to 20th	Night	3 1 4 42% 44% 6%	564
	21st to end	Night	4 5% 31% 53% 7%	627
September	1st to 10th	Night	7% 1 8% 29% 48% 6%	570
	11th to 20th	Night	10% 1 8% 32% 46% 4	570
	21st to end	Night	8% 1 12% 33% 39% 7%	570
October	1st to 10th	Night	6% 1 9% 43% 36% 5%	589
	11th to 20th	Night	10% 3 23% 41% 20% 2	760
	21st to end	Night	13% 7% 22% 35% 21% 2	836
November	1st to 10th	Night	12% 4 23% 39% 20% 2	780
	11th to 20th	Night	13% 8% 24% 38% 16% 1	800
	21st to end	Night	18% 10% 28% 30% 13% 1	965
December	1st to 10th	Night	22% 9% 25% 30% 13% 1	1000
	11th to 20th	Night	25% 12% 26% 30% 7% 1	1000
	21st to end	Night	21% 10% 30% 31% 8% 1	1100

Page generated at 2025-01-04 02:24:00. Version ac07

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