Stephanie's Evening Solace
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Stephanie's Evening Solace 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	13% 6% 2 6% 5% 5% 5% 4 6% 8% 41%	101290
	Night	14% 6% 2 5% 4 3 4 3 5% 7% 46%	98419
Transparency	Day	39% 7% 11% 19% 17% 7%	105004
	Night	35% 6% 12% 20% 18% 9%	102832
Seeing	Day	13% 7% 19% 26% 25% 11%	14940
	Night	15% 6% 23% 34% 20% 2	24823

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% 8% 2 6% 3 2 4 2 4 6% 45%	2847
	11th to 20th	Day	18% 7% 2 4 3 2 2 2 4 5% 51%	2850
	21st to end	Day	23% 8% 2 6% 3 3 3 2 5% 8% 36%	3135
February	1st to 10th	Day	23% 9% 3 6% 4 4 3 3 5% 5% 37%	1827
	11th to 20th	Day	20% 10% 3 6% 4 4 3 3 3 5% 39%	1849
	21st to end	Day	19% 8% 2 6% 4 4 4 3 4 5% 41%	1712
March	1st to 10th	Day	18% 8% 4 7% 5% 6% 5% 4 6% 7% 32%	3436
	11th to 20th	Day	19% 8% 3 8% 6% 5% 4 3 6% 6% 30%	3480
	21st to end	Day	18% 7% 2 5% 4 3 4 3 5% 6% 42%	3814
April	1st to 10th	Day	15% 8% 3 9% 5% 5% 3 4 4 6% 37%	2090
	11th to 20th	Day	18% 7% 2 6% 5% 4 5% 4 5% 6% 39%	2188
	21st to end	Day	12% 7% 3 7% 5% 4 4 4 6% 7% 43%	2280
May	1st to 10th	Day	19% 8% 3 8% 6% 4 5% 4 6% 7% 30%	3925
	11th to 20th	Day	14% 7% 2 6% 4 4 5% 4 5% 7% 41%	4082
	21st to end	Day	10% 7% 2 7% 5% 6% 6% 5% 7% 11% 34%	4477
June	1st to 10th	Day	6% 4 2 6% 5% 5% 6% 6% 7% 9% 43%	2470
	11th to 20th	Day	6% 3 1 5% 5% 5% 7% 6% 9% 10% 43%	2470
	21st to end	Day	6% 5% 3 8% 8% 7% 8% 7% 9% 9% 29%	2470
July	1st to 10th	Day	9% 4 1 6% 5% 5% 7% 5% 8% 12% 38%	4120
	11th to 20th	Day	6% 6% 3 8% 6% 7% 7% 6% 8% 11% 32%	4120
	21st to end	Day	14% 9% 3 8% 6% 5% 6% 5% 7% 10% 27%	4465
August	1st to 10th	Day	2 1 1 3 3 4 4 4 6% 10% 61%	4104
	11th to 20th	Day	3 2 1 4 3 4 7% 5% 10% 14% 46%	3927
	21st to end	Day	6% 5% 2 7% 6% 7% 6% 5% 7% 10% 39%	4027
September	1st to 10th	Day	7% 5% 1 8% 5% 6% 7% 5% 7% 9% 40%	2090
	11th to 20th	Day	10% 7% 3 8% 6% 6% 6% 4 6% 8% 37%	2090
	21st to end	Day	7% 4 2 7% 5% 5% 6% 5% 6% 7% 47%	2090
October	1st to 10th	Day	7% 5% 1 4 4 4 4 4 5% 6% 57%	1997
	11th to 20th	Day	10% 5% 3 6% 4 4 4 3 4 6% 52%	1900
	21st to end	Day	13% 5% 2 5% 3 4 3 3 4 5% 54%	2090
November	1st to 10th	Day	11% 6% 2 6% 4 5% 4 4 5% 8% 45%	1958
	11th to 20th	Day	12% 6% 2 5% 3 4 3 3 6% 6% 49%	2000
	21st to end	Day	17% 8% 2 5% 5% 5% 4 3 4 5% 43%	1895
December	1st to 10th	Day	16% 8% 3 8% 4 4 4 3 4 6% 41%	1719
	11th to 20th	Day	16% 7% 3 6% 5% 4 4 3 4 6% 42%	2161
	21st to end	Day	17% 7% 3 6% 4 3 3 3 4 5% 46%	3135
January	1st to 10th	Night	19% 7% 2 4 3 3 3 2 4 6% 47%	4108
	11th to 20th	Night	18% 7% 2 4 2 2 2 2 3 4 54%	4120
	21st to end	Night	23% 8% 2 5% 4 3 3 3 4 7% 38%	4532
February	1st to 10th	Night	20% 9% 3 6% 4 3 3 2 4 6% 39%	2370
	11th to 20th	Night	21% 8% 2 6% 3 3 3 2 3 5% 44%	2218
	21st to end	Night	23% 7% 3 5% 3 3 3 2 4 6% 40%	1740
March	1st to 10th	Night	23% 11% 4 7% 3 3 3 3 5% 6% 32%	3419
	11th to 20th	Night	24% 9% 4 8% 5% 3 4 3 5% 6% 30%	3480
	21st to end	Night	14% 7% 2 7% 5% 4 4 3 4 5% 44%	3817
April	1st to 10th	Night	15% 7% 2 6% 4 4 5% 4 5% 6% 42%	2090
	11th to 20th	Night	17% 7% 3 5% 4 3 3 3 4 7% 44%	1938
	21st to end	Night	15% 6% 3 5% 4 4 4 3 5% 6% 45%	1900
May	1st to 10th	Night	24% 9% 3 6% 5% 4 4 3 4 7% 31%	2958
	11th to 20th	Night	14% 7% 3 6% 4 4 5% 3 5% 6% 43%	2823
	21st to end	Night	13% 7% 3 6% 4 4 4 4 8% 10% 37%	3090
June	1st to 10th	Night	5% 4 2 4 3 3 4 5% 6% 10% 55%	1710
	11th to 20th	Night	4 4 1 4 3 3 4 4 7% 11% 56%	1710
	21st to end	Night	4 5% 2 5% 5% 5% 4 6% 8% 11% 44%	1710
July	1st to 10th	Night	6% 4 1 5% 4 4 5% 5% 8% 12% 46%	2850
	11th to 20th	Night	4 4 2 7% 5% 4 4 4 6% 12% 46%	2850
	21st to end	Night	10% 7% 3 8% 5% 5% 4 4 7% 9% 37%	3098
August	1st to 10th	Night	1 1 1 2 3 2 3 2 5% 10% 70%	2836
	11th to 20th	Night	2 2 1 3 2 3 4 4 8% 12% 59%	2905
	21st to end	Night	4 3 1 5% 4 6% 5% 5% 8% 12% 48%	3623
September	1st to 10th	Night	5% 5% 2 5% 5% 4 4 4 8% 10% 48%	2090
	11th to 20th	Night	10% 5% 3 7% 5% 4 4 3 6% 8% 45%	2090
	21st to end	Night	8% 5% 1 4 3 3 4 3 5% 8% 55%	2090
October	1st to 10th	Night	4 5% 1 5% 3 3 3 3 5% 8% 62%	2162
	11th to 20th	Night	10% 4 1 3 3 3 3 3 4 5% 60%	2280
	21st to end	Night	12% 5% 2 4 3 3 3 2 3 4 60%	2508
November	1st to 10th	Night	12% 6% 2 5% 4 3 4 3 4 6% 52%	2340
	11th to 20th	Night	13% 5% 2 5% 3 4 3 3 5% 5% 51%	2400
	21st to end	Night	17% 6% 3 6% 4 3 4 4 5% 5% 45%	2500
December	1st to 10th	Night	19% 8% 2 5% 4 3 4 3 4 5% 43%	2496
	11th to 20th	Night	16% 10% 3 7% 4 4 3 2 4 5% 42%	3036
	21st to end	Night	17% 7% 2 6% 4 3 3 3 4 6% 46%	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% 5% 16% 22% 10%	2848
	11th to 20th	Day	37% 4 5% 19% 26% 9%	2850
	21st to end	Day	49% 2 5% 15% 18% 11%	3135
February	1st to 10th	Day	50% 4 4 13% 16% 12%	1827
	11th to 20th	Day	49% 4 6% 14% 17% 10%	1859
	21st to end	Day	46% 5% 7% 16% 14% 12%	1712
March	1st to 10th	Day	50% 7% 9% 15% 16% 4	3436
	11th to 20th	Day	53% 6% 8% 12% 15% 6%	3480
	21st to end	Day	43% 5% 7% 19% 22% 5%	3814
April	1st to 10th	Day	48% 6% 6% 17% 15% 9%	2090
	11th to 20th	Day	45% 6% 8% 14% 18% 9%	2188
	21st to end	Day	40% 6% 8% 20% 20% 6%	2280
May	1st to 10th	Day	51% 6% 11% 17% 10% 4	3960
	11th to 20th	Day	41% 6% 9% 18% 22% 3	4086
	21st to end	Day	41% 8% 11% 29% 11% 1	4489
June	1st to 10th	Day	32% 9% 16% 26% 16% 2	2470
	11th to 20th	Day	31% 9% 17% 24% 16% 3	2470
	21st to end	Day	44% 12% 14% 21% 9%	2470
July	1st to 10th	Day	35% 10% 28% 24% 4	4056
	11th to 20th	Day	40% 11% 19% 22% 9%	4051
	21st to end	Day	47% 11% 18% 19% 4	4325
August	1st to 10th	Day	17% 7% 16% 39% 20% 1	4090
	11th to 20th	Day	24% 9% 33% 27% 7% 1	3966
	21st to end	Day	37% 11% 17% 20% 13% 2	4026
September	1st to 10th	Day	38% 10% 14% 19% 14% 6%	2090
	11th to 20th	Day	43% 8% 12% 16% 17% 4	2090
	21st to end	Day	33% 7% 13% 18% 17% 13%	2090
October	1st to 10th	Day	17% 5% 6% 14% 19% 39%	3322
	11th to 20th	Day	22% 4 6% 15% 34% 19%	3140
	21st to end	Day	27% 4 5% 16% 34% 14%	3428
November	1st to 10th	Day	37% 6% 9% 17% 21% 10%	1958
	11th to 20th	Day	36% 5% 9% 14% 23% 14%	2000
	21st to end	Day	43% 5% 7% 16% 18% 11%	1895
December	1st to 10th	Day	46% 4 7% 17% 18% 7%	1719
	11th to 20th	Day	44% 5% 5% 13% 22% 10%	2159
	21st to end	Day	41% 4 5% 15% 23% 11%	3135
January	1st to 10th	Night	39% 5% 7% 18% 18% 14%	4108
	11th to 20th	Night	37% 3 5% 17% 27% 11%	4120
	21st to end	Night	47% 4 4 16% 20% 10%	4532
February	1st to 10th	Night	47% 4 5% 12% 17% 14%	2370
	11th to 20th	Night	44% 4 7% 15% 18% 12%	2218
	21st to end	Night	46% 4 7% 14% 15% 14%	1740
March	1st to 10th	Night	52% 6% 8% 14% 14% 5%	3419
	11th to 20th	Night	54% 6% 8% 14% 12% 5%	3480
	21st to end	Night	41% 5% 9% 14% 23% 7%	3817
April	1st to 10th	Night	42% 6% 9% 18% 15% 10%	2090
	11th to 20th	Night	40% 5% 10% 16% 16% 13%	1938
	21st to end	Night	40% 5% 8% 21% 19% 7%	1900
May	1st to 10th	Night	52% 7% 8% 18% 10% 5%	2988
	11th to 20th	Night	39% 8% 9% 19% 20% 6%	2824
	21st to end	Night	37% 10% 15% 29% 7% 1	3099
June	1st to 10th	Night	22% 8% 19% 32% 19% 1	1710
	11th to 20th	Night	22% 7% 18% 31% 18% 4	1710
	21st to end	Night	29% 11% 19% 27% 13% 1	1710
July	1st to 10th	Night	28% 10% 33% 25% 4	2805
	11th to 20th	Night	30% 9% 25% 26% 10%	2796
	21st to end	Night	42% 10% 20% 23% 4	2999
August	1st to 10th	Night	11% 5% 19% 46% 19%	2826
	11th to 20th	Night	16% 8% 35% 33% 7% 1	2932
	21st to end	Night	27% 14% 21% 27% 10% 1	3623
September	1st to 10th	Night	29% 10% 22% 20% 13% 5%	2090
	11th to 20th	Night	36% 8% 14% 21% 15% 5%	2090
	21st to end	Night	26% 7% 15% 22% 19% 12%	2090
October	1st to 10th	Night	15% 4 7% 17% 16% 40%	3604
	11th to 20th	Night	16% 3 5% 22% 32% 22%	3779
	21st to end	Night	22% 3 5% 19% 35% 16%	4120
November	1st to 10th	Night	33% 5% 10% 21% 21% 10%	2340
	11th to 20th	Night	35% 5% 8% 18% 21% 14%	2400
	21st to end	Night	40% 4 8% 18% 19% 11%	2500
December	1st to 10th	Night	43% 5% 7% 20% 15% 9%	2496
	11th to 20th	Night	45% 4 7% 10% 19% 14%	3037
	21st to end	Night	40% 5% 6% 14% 28% 8%	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	25% 12% 35% 21% 6% 1	270
	11th to 20th	Day	25% 17% 25% 25% 7% 1	270
	21st to end	Day	22% 17% 35% 19% 7%	297
February	1st to 10th	Day	29% 18% 27% 20% 5% 1	270
	11th to 20th	Day	26% 21% 29% 19% 4 1	270
	21st to end	Day	27% 22% 36% 14% 2	225
March	1st to 10th	Day	24% 19% 36% 16% 6%	270
	11th to 20th	Day	17% 20% 38% 19% 5% 1	270
	21st to end	Day	21% 14% 35% 22% 8%	297
April	1st to 10th	Day	15% 19% 39% 21% 6%	270
	11th to 20th	Day	25% 14% 28% 22% 11% 1	386
	21st to end	Day	13% 11% 35% 29% 10% 2	460
May	1st to 10th	Day	14% 12% 32% 29% 13% 1	558
	11th to 20th	Day	14% 5% 27% 33% 18% 3	675
	21st to end	Day	9% 6% 24% 36% 22% 4	734
June	1st to 10th	Day	7% 2 11% 36% 34% 11%	680
	11th to 20th	Day	7% 1 10% 36% 34% 12%	680
	21st to end	Day	8% 2 10% 27% 35% 18%	680
July	1st to 10th	Day	7% 2 7% 23% 38% 23%	671
	11th to 20th	Day	4 1 4 19% 47% 25%	668
	21st to end	Day	6% 2 4 20% 47% 22%	739
August	1st to 10th	Day	3 1 2 19% 48% 27%	676
	11th to 20th	Day	5% 1 3 16% 46% 29%	603
	21st to end	Day	9% 2 3 17% 34% 35%	451
September	1st to 10th	Day	8% 2 4 27% 37% 22%	300
	11th to 20th	Day	7% 2 8% 22% 38% 23%	300
	21st to end	Day	7% 1 8% 29% 33% 20%	300
October	1st to 10th	Day	6% 2 9% 40% 34% 8%	300
	11th to 20th	Day	9% 5% 19% 35% 23% 8%	300
	21st to end	Day	20% 9% 23% 21% 22% 6%	330
November	1st to 10th	Day	15% 6% 18% 38% 20% 3	300
	11th to 20th	Day	15% 6% 29% 33% 15% 3	300
	21st to end	Day	18% 18% 29% 22% 9% 4	300
December	1st to 10th	Day	17% 7% 36% 26% 10% 5%	273
	11th to 20th	Day	23% 17% 31% 24% 4 1	270
	21st to end	Day	18% 12% 37% 24% 7% 2	297
January	1st to 10th	Night	24% 10% 30% 29% 8%	950
	11th to 20th	Night	22% 12% 29% 31% 6%	950
	21st to end	Night	23% 10% 30% 31% 6%	1045
February	1st to 10th	Night	25% 12% 31% 28% 4	850
	11th to 20th	Night	26% 9% 31% 29% 4	744
	21st to end	Night	26% 13% 37% 21% 2	484
March	1st to 10th	Night	24% 11% 34% 28% 4	570
	11th to 20th	Night	20% 8% 35% 30% 6%	570
	21st to end	Night	17% 10% 38% 29% 6% 1	627
April	1st to 10th	Night	17% 9% 37% 34% 4	570
	11th to 20th	Night	22% 7% 31% 30% 10%	563
	21st to end	Night	16% 8% 36% 31% 9%	570
May	1st to 10th	Night	16% 9% 31% 35% 8%	570
	11th to 20th	Night	12% 6% 29% 38% 14% 2	561
	21st to end	Night	8% 4 25% 40% 21% 2	617
June	1st to 10th	Night	6% 2 12% 46% 31% 3	570
	11th to 20th	Night	4 1 12% 52% 28% 2	570
	21st to end	Night	5% 2 10% 37% 39% 6%	570
July	1st to 10th	Night	6% 1 6% 37% 42% 8%	555
	11th to 20th	Night	4 1 3 37% 49% 5%	552
	21st to end	Night	3 1 4 39% 48% 5%	624
August	1st to 10th	Night	1 1 2 40% 51% 5%	567
	11th to 20th	Night	4 1 3 34% 51% 7%	564
	21st to end	Night	5% 1 4 30% 51% 9%	627
September	1st to 10th	Night	5% 1 6% 29% 51% 8%	570
	11th to 20th	Night	10% 2 7% 32% 45% 4	570
	21st to end	Night	9% 1 9% 34% 41% 6%	570
October	1st to 10th	Night	5% 2 12% 39% 37% 5%	642
	11th to 20th	Night	12% 2 22% 40% 23% 2	760
	21st to end	Night	13% 7% 23% 35% 20% 2	836
November	1st to 10th	Night	12% 5% 22% 39% 21% 1	780
	11th to 20th	Night	14% 9% 24% 37% 16% 1	800
	21st to end	Night	19% 9% 27% 31% 13% 1	900
December	1st to 10th	Night	21% 8% 27% 32% 12% 1	960
	11th to 20th	Night	23% 11% 28% 30% 6% 1	950
	21st to end	Night	22% 9% 31% 29% 8%	1045

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