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 2024-08-15.

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	13% 6% 2 6% 5% 4 5% 4 6% 8% 41%	95371
	Night	14% 6% 2 5% 4 3 4 3 5% 7% 46%	93402
Transparency	Day	40% 7% 12% 19% 16% 7%	95147
	Night	37% 6% 12% 20% 16% 9%	93232
Seeing	Day	12% 7% 19% 26% 25% 10%	14568
	Night	15% 7% 23% 34% 19% 2	24419

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 4 3 3 4 6% 44%	2847
	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	2 2 1 5% 5% 5% 5% 5% 7% 10% 51%	2458
	11th to 20th	Day	5% 3 1 6% 5% 6% 6% 5% 8% 11% 43%	2347
	21st to end	Day	6% 4 1 7% 6% 7% 6% 5% 8% 10% 39%	2185
September	1st to 10th	Day	6% 5% 2 7% 6% 5% 6% 5% 7% 9% 41%	1980
	11th to 20th	Day	11% 7% 3 8% 6% 6% 4 4 6% 6% 39%	1980
	21st to end	Day	8% 5% 2 6% 5% 6% 5% 4 6% 8% 45%	1980
October	1st to 10th	Day	6% 4 2 4 4 5% 4 3 5% 8% 55%	1942
	11th to 20th	Day	12% 5% 2 6% 3 4 4 3 4 6% 50%	1800
	21st to end	Day	13% 6% 1 5% 4 2 3 3 4 5% 55%	1980
November	1st to 10th	Day	11% 6% 2 5% 4 4 5% 4 5% 8% 46%	1858
	11th to 20th	Day	11% 6% 2 5% 3 3 4 3 4 6% 52%	1900
	21st to end	Day	16% 7% 2 7% 4 4 4 3 5% 6% 41%	1739
December	1st to 10th	Day	16% 9% 3 7% 4 3 4 3 4 5% 42%	1710
	11th to 20th	Day	17% 7% 2 7% 5% 4 3 3 5% 5% 42%	2161
	21st to end	Day	16% 7% 3 5% 4 3 3 3 4 5% 48%	3135
January	1st to 10th	Night	20% 7% 2 4 3 4 3 2 3 5% 47%	4108
	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	2 1 1 2 2 2 2 3 6% 12% 66%	1701
	11th to 20th	Night	3 4 1 4 3 3 4 4 7% 12% 54%	1649
	21st to end	Night	5% 3 2 5% 5% 4 6% 4 8% 13% 46%	2166
September	1st to 10th	Night	5% 4 2 6% 3 4 5% 5% 6% 9% 50%	1980
	11th to 20th	Night	10% 6% 2 7% 4 5% 4 2 6% 9% 45%	1980
	21st to end	Night	8% 4 2 5% 3 3 4 4 6% 7% 53%	1980
October	1st to 10th	Night	5% 4 1 4 2 3 3 2 5% 9% 62%	1998
	11th to 20th	Night	11% 5% 1 4 3 3 4 2 4 6% 57%	2160
	21st to end	Night	13% 5% 1 3 3 2 2 2 3 5% 60%	2376
November	1st to 10th	Night	10% 6% 1 5% 4 4 4 3 5% 5% 54%	2220
	11th to 20th	Night	10% 6% 3 5% 4 3 3 3 5% 5% 51%	2280
	21st to end	Night	16% 6% 2 6% 3 3 4 3 5% 7% 45%	2436
December	1st to 10th	Night	19% 8% 2 4 4 3 3 3 5% 5% 45%	2470
	11th to 20th	Night	17% 8% 3 6% 3 4 4 3 5% 5% 42%	3036
	21st to end	Night	17% 7% 2 4 3 3 3 3 3 5% 49%	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	42% 5% 7% 15% 21% 11%	2848
	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	26% 9% 18% 33% 13% 1	2444
	11th to 20th	Day	31% 12% 21% 25% 9% 2	2347
	21st to end	Day	36% 11% 18% 22% 10% 2	2185
September	1st to 10th	Day	36% 11% 15% 20% 14% 5%	1980
	11th to 20th	Day	42% 9% 13% 16% 16% 4	1980
	21st to end	Day	35% 8% 12% 18% 16% 11%	1980
October	1st to 10th	Day	27% 6% 11% 23% 21% 13%	1942
	11th to 20th	Day	34% 6% 9% 15% 20% 16%	1800
	21st to end	Day	32% 5% 6% 16% 22% 19%	1980
November	1st to 10th	Day	36% 7% 10% 17% 21% 10%	1858
	11th to 20th	Day	34% 5% 11% 17% 20% 13%	1900
	21st to end	Day	45% 5% 7% 14% 17% 12%	1739
December	1st to 10th	Day	45% 4 8% 17% 19% 7%	1710
	11th to 20th	Day	43% 6% 7% 11% 22% 11%	2159
	21st to end	Day	40% 4 6% 15% 24% 12%	3135
January	1st to 10th	Night	39% 5% 7% 16% 18% 15%	4108
	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	11% 6% 26% 41% 15% 1	1691
	11th to 20th	Night	21% 11% 27% 32% 8% 1	1649
	21st to end	Night	28% 13% 23% 26% 9% 2	2166
September	1st to 10th	Night	28% 11% 19% 22% 14% 6%	1980
	11th to 20th	Night	34% 9% 15% 23% 13% 5%	1980
	21st to end	Night	28% 8% 14% 20% 18% 11%	1980
October	1st to 10th	Night	22% 5% 12% 27% 21% 13%	1998
	11th to 20th	Night	29% 5% 9% 19% 20% 17%	2160
	21st to end	Night	29% 4 7% 17% 22% 22%	2376
November	1st to 10th	Night	32% 7% 10% 21% 19% 12%	2220
	11th to 20th	Night	35% 5% 10% 19% 19% 13%	2280
	21st to end	Night	40% 4 8% 16% 18% 13%	2436
December	1st to 10th	Night	41% 6% 8% 20% 16% 10%	2470
	11th to 20th	Night	44% 5% 6% 11% 18% 16%	3037
	21st to end	Night	39% 4 6% 13% 28% 10%	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	24% 9% 36% 25% 6%	270
	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% 19% 47% 24%	629
	21st to end	Day	9% 1 3 16% 30% 41%	304
September	1st to 10th	Day	8% 3 20% 38% 31%	270
	11th to 20th	Day	8% 2 5% 21% 41% 23%	270
	21st to end	Day	10% 2 5% 23% 38% 22%	270
October	1st to 10th	Day	5% 3 9% 32% 37% 14%	270
	11th to 20th	Day	12% 3 18% 32% 23% 12%	270
	21st to end	Day	21% 9% 20% 24% 20% 6%	297
November	1st to 10th	Day	14% 4 18% 35% 21% 7%	270
	11th to 20th	Day	17% 7% 22% 35% 16% 3	270
	21st to end	Day	21% 13% 31% 21% 10% 3	270
December	1st to 10th	Day	18% 8% 32% 24% 14% 5%	270
	11th to 20th	Day	23% 17% 28% 24% 6% 2	270
	21st to end	Day	20% 8% 39% 22% 8% 2	297
January	1st to 10th	Night	21% 10% 30% 30% 8%	950
	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 5% 42% 44% 6%	549
	21st to end	Night	4 5% 31% 53% 7%	594
September	1st to 10th	Night	7% 7% 29% 50% 7%	540
	11th to 20th	Night	11% 7% 31% 47% 4	540
	21st to end	Night	9% 1 12% 32% 39% 7%	540
October	1st to 10th	Night	6% 1 10% 42% 36% 5%	558
	11th to 20th	Night	11% 3 23% 40% 20% 2	720
	21st to end	Night	14% 7% 22% 34% 21% 2	792
November	1st to 10th	Night	11% 3 23% 39% 21% 2	740
	11th to 20th	Night	13% 8% 23% 38% 17% 1	760
	21st to end	Night	18% 9% 28% 30% 14% 1	916
December	1st to 10th	Night	22% 9% 25% 30% 13% 1	950
	11th to 20th	Night	25% 12% 26% 30% 7% 1	950
	21st to end	Night	21% 10% 29% 31% 8% 1	1045

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