Bad Wolf Ranch
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bad Wolf Ranch clear sky chart from 2005-11-06 to 2026-03-18.

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	10% 5% 2 5% 4 4 4 3 5% 7% 52%	131551
	Night	11% 5% 2 4 3 3 3 3 4 6% 56%	130280
Transparency	Day	30% 6% 10% 21% 22% 11%	135319
	Night	29% 5% 10% 21% 22% 14%	134576
Seeing	Day	11% 7% 24% 30% 22% 6%	16702
	Night	12% 7% 29% 36% 15% 1	26748

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	10% 6% 3 5% 2 3 3 3 4 6% 56%	5289
	11th to 20th	Day	10% 5% 2 4 3 2 2 3 4 5% 60%	5310
	21st to end	Day	20% 7% 2 6% 3 3 3 3 3 5% 45%	6111
February	1st to 10th	Day	15% 7% 2 5% 3 2 3 3 3 5% 52%	2100
	11th to 20th	Day	14% 8% 3 5% 3 2 4 3 4 6% 49%	2049
	21st to end	Day	16% 6% 2 4 2 2 3 1 4 5% 55%	1730
March	1st to 10th	Day	12% 6% 2 6% 4 3 4 3 5% 5% 50%	4950
	11th to 20th	Day	13% 5% 2 4 3 3 4 3 5% 6% 53%	5057
	21st to end	Day	10% 6% 2 6% 4 4 4 3 6% 7% 50%	5462
April	1st to 10th	Day	12% 8% 3 5% 4 4 4 3 5% 7% 47%	2200
	11th to 20th	Day	14% 7% 2 6% 4 4 3 3 4 6% 47%	2220
	21st to end	Day	11% 6% 2 5% 4 4 4 3 4 5% 50%	2575
May	1st to 10th	Day	15% 7% 2 6% 4 4 4 3 6% 7% 41%	5862
	11th to 20th	Day	12% 6% 2 6% 4 4 4 3 5% 7% 46%	5862
	21st to end	Day	12% 6% 3 7% 5% 5% 5% 5% 6% 8% 38%	6434
June	1st to 10th	Day	5% 3 2 4 4 5% 5% 4 6% 9% 53%	2600
	11th to 20th	Day	5% 3 1 4 4 4 6% 4 7% 9% 53%	2600
	21st to end	Day	6% 4 1 5% 4 5% 5% 4 7% 9% 51%	2600
July	1st to 10th	Day	11% 5% 2 6% 5% 5% 5% 4 7% 8% 41%	5900
	11th to 20th	Day	4 2 1 3 4 4 4 4 6% 10% 58%	5900
	21st to end	Day	5% 3 1 5% 5% 4 5% 4 7% 11% 50%	6422
August	1st to 10th	Day	1 1 1 2 3 3 3 3 5% 7% 72%	4234
	11th to 20th	Day	4 3 1 3 3 3 3 3 5% 9% 64%	3911
	21st to end	Day	4 3 1 3 4 4 5% 4 6% 10% 56%	4166
September	1st to 10th	Day	11% 4 2 4 4 4 4 4 5% 6% 50%	2200
	11th to 20th	Day	10% 6% 2 5% 4 4 4 3 5% 7% 50%	2200
	21st to end	Day	7% 4 1 4 3 3 4 3 6% 7% 57%	2200
October	1st to 10th	Day	5% 3 1 4 3 4 3 4 6% 5% 63%	2200
	11th to 20th	Day	10% 4 2 4 3 2 3 3 4 6% 61%	2055
	21st to end	Day	10% 5% 2 3 3 3 3 2 3 4 63%	2200
November	1st to 10th	Day	13% 6% 2 5% 4 2 3 3 4 5% 55%	2058
	11th to 20th	Day	8% 4 2 5% 3 3 3 3 4 6% 59%	1906
	21st to end	Day	15% 7% 2 5% 3 3 3 2 3 5% 52%	1890
December	1st to 10th	Day	17% 6% 2 5% 4 3 4 3 3 4 47%	3030
	11th to 20th	Day	14% 6% 2 6% 5% 4 4 4 5% 5% 46%	3481
	21st to end	Day	12% 6% 2 3 3 2 3 2 3 4 61%	4587
January	1st to 10th	Night	13% 5% 1 4 3 3 2 2 3 4 60%	7634
	11th to 20th	Night	8% 3 2 3 2 2 2 2 3 5% 69%	7680
	21st to end	Night	23% 6% 2 6% 3 3 3 3 3 5% 42%	8145
February	1st to 10th	Night	13% 6% 2 6% 4 3 3 2 3 5% 54%	2520
	11th to 20th	Night	16% 6% 2 5% 3 3 2 2 4 5% 52%	2458
	21st to end	Night	15% 5% 2 3 3 3 2 2 5% 5% 54%	2076
March	1st to 10th	Night	11% 6% 2 5% 4 3 3 3 5% 7% 51%	5125
	11th to 20th	Night	12% 6% 2 4 3 3 4 3 5% 6% 53%	5057
	21st to end	Night	11% 7% 2 5% 3 3 4 3 4 6% 52%	5467
April	1st to 10th	Night	10% 5% 2 4 4 3 4 3 5% 6% 53%	2200
	11th to 20th	Night	12% 6% 2 6% 3 4 4 4 4 5% 50%	2125
	21st to end	Night	11% 6% 2 4 3 4 3 3 4 7% 52%	1825
May	1st to 10th	Night	20% 7% 2 5% 3 3 3 2 4 6% 45%	4053
	11th to 20th	Night	8% 6% 2 6% 5% 5% 5% 4 5% 7% 49%	4053
	21st to end	Night	12% 6% 2 5% 4 4 4 4 6% 9% 44%	4443
June	1st to 10th	Night	3 2 1 4 3 3 3 4 6% 10% 60%	1800
	11th to 20th	Night	5% 3 1 3 2 2 4 3 6% 9% 62%	1800
	21st to end	Night	4 4 1 3 3 4 3 4 6% 8% 59%	1800
July	1st to 10th	Night	9% 4 2 5% 4 3 4 3 6% 10% 50%	4078
	11th to 20th	Night	3 1 1 2 2 3 3 3 6% 10% 65%	4077
	21st to end	Night	4 4 1 5% 3 3 4 3 6% 10% 56%	4449
August	1st to 10th	Night	1 1 2 1 2 2 2 4 6% 79%	2926
	11th to 20th	Night	3 2 1 3 2 2 4 3 6% 10% 64%	3142
	21st to end	Night	4 2 1 3 3 3 3 3 7% 10% 60%	3725
September	1st to 10th	Night	8% 4 2 4 4 4 4 4 6% 7% 54%	2200
	11th to 20th	Night	9% 6% 2 5% 2 4 3 4 5% 9% 50%	2200
	21st to end	Night	7% 4 1 3 3 3 3 3 5% 7% 61%	2200
October	1st to 10th	Night	5% 3 1 2 2 2 3 3 4 5% 69%	2200
	11th to 20th	Night	10% 3 1 4 2 3 3 3 4 5% 63%	2322
	21st to end	Night	12% 4 2 4 2 3 2 2 3 5% 63%	2640
November	1st to 10th	Night	12% 4 2 5% 3 3 2 2 4 5% 60%	2460
	11th to 20th	Night	6% 5% 2 4 3 3 3 3 4 5% 61%	2711
	21st to end	Night	15% 5% 2 4 3 3 3 3 4 6% 52%	2730
December	1st to 10th	Night	17% 5% 2 5% 3 3 3 2 4 6% 49%	4380
	11th to 20th	Night	18% 7% 2 5% 3 2 3 2 4 5% 49%	4946
	21st to end	Night	15% 5% 2 3 2 2 2 2 3 4 59%	6633

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	30% 5% 5% 23% 27% 9%	5290
	11th to 20th	Day	27% 3 5% 17% 31% 17%	5310
	21st to end	Day	44% 4 5% 14% 23% 12%	6111
February	1st to 10th	Day	37% 4 6% 14% 22% 18%	2100
	11th to 20th	Day	38% 4 7% 19% 20% 13%	2059
	21st to end	Day	34% 3 5% 15% 25% 18%	1730
March	1st to 10th	Day	35% 5% 6% 14% 20% 21%	4950
	11th to 20th	Day	31% 6% 8% 9% 15% 31%	5057
	21st to end	Day	32% 7% 10% 19% 23% 10%	5464
April	1st to 10th	Day	38% 5% 8% 17% 16% 16%	2200
	11th to 20th	Day	38% 5% 8% 16% 20% 12%	2220
	21st to end	Day	34% 6% 8% 20% 23% 9%	2575
May	1st to 10th	Day	40% 7% 11% 18% 19% 4	5900
	11th to 20th	Day	37% 7% 8% 15% 25% 8%	5866
	21st to end	Day	40% 9% 11% 21% 13% 6%	6447
June	1st to 10th	Day	26% 8% 13% 28% 21% 4	2600
	11th to 20th	Day	26% 6% 13% 28% 19% 7%	2600
	21st to end	Day	28% 8% 14% 22% 23% 5%	2600
July	1st to 10th	Day	38% 8% 18% 28% 8% 1	5836
	11th to 20th	Day	20% 8% 17% 32% 19% 3	5831
	21st to end	Day	25% 9% 17% 28% 19% 3	6240
August	1st to 10th	Day	12% 5% 13% 32% 37% 1	4220
	11th to 20th	Day	18% 6% 16% 40% 18% 3	3949
	21st to end	Day	23% 10% 19% 27% 20% 3	4165
September	1st to 10th	Day	33% 6% 11% 20% 19% 11%	2200
	11th to 20th	Day	34% 6% 12% 20% 22% 6%	2200
	21st to end	Day	26% 7% 9% 22% 22% 15%	2200
October	1st to 10th	Day	14% 3 7% 13% 26% 37%	3590
	11th to 20th	Day	17% 3 7% 18% 31% 23%	3321
	21st to end	Day	21% 4 4 18% 39% 13%	3538
November	1st to 10th	Day	33% 4 8% 17% 27% 12%	2058
	11th to 20th	Day	27% 4 9% 18% 24% 18%	1906
	21st to end	Day	36% 4 5% 19% 22% 14%	1890
December	1st to 10th	Day	40% 4 6% 17% 21% 11%	3030
	11th to 20th	Day	39% 6% 6% 10% 25% 14%	3479
	21st to end	Day	29% 4 5% 17% 28% 17%	4587
January	1st to 10th	Night	30% 3 6% 19% 29% 13%	7635
	11th to 20th	Night	21% 2 4 18% 31% 25%	7680
	21st to end	Night	47% 3 3 11% 22% 13%	8145
February	1st to 10th	Night	34% 4 7% 13% 24% 19%	2520
	11th to 20th	Night	36% 3 7% 18% 22% 15%	2458
	21st to end	Night	34% 4 6% 14% 23% 20%	2076
March	1st to 10th	Night	31% 5% 8% 16% 24% 17%	5125
	11th to 20th	Night	31% 6% 8% 12% 16% 26%	5057
	21st to end	Night	33% 6% 8% 18% 24% 11%	5467
April	1st to 10th	Night	31% 6% 9% 19% 18% 17%	2200
	11th to 20th	Night	35% 6% 9% 15% 20% 15%	2125
	21st to end	Night	32% 5% 11% 20% 21% 10%	1825
May	1st to 10th	Night	40% 6% 9% 22% 16% 8%	4080
	11th to 20th	Night	33% 7% 12% 17% 18% 13%	4054
	21st to end	Night	36% 7% 13% 28% 11% 5%	4452
June	1st to 10th	Night	19% 8% 16% 31% 22% 4	1800
	11th to 20th	Night	18% 6% 16% 31% 21% 7%	1800
	21st to end	Night	21% 8% 13% 30% 23% 5%	1800
July	1st to 10th	Night	31% 7% 21% 34% 7% 1	4035
	11th to 20th	Night	14% 7% 21% 39% 18% 2	4026
	21st to end	Night	23% 8% 19% 29% 16% 4	4320
August	1st to 10th	Night	8% 4 12% 37% 37% 3	2916
	11th to 20th	Night	15% 6% 24% 35% 17% 2	3170
	21st to end	Night	19% 10% 21% 30% 18% 3	3725
September	1st to 10th	Night	29% 8% 12% 22% 19% 11%	2200
	11th to 20th	Night	31% 7% 14% 24% 18% 7%	2200
	21st to end	Night	23% 5% 11% 25% 21% 15%	2200
October	1st to 10th	Night	11% 3 6% 16% 22% 41%	3590
	11th to 20th	Night	16% 4 8% 17% 30% 24%	3782
	21st to end	Night	20% 3 5% 20% 36% 16%	4252
November	1st to 10th	Night	28% 4 7% 19% 27% 15%	2460
	11th to 20th	Night	25% 4 8% 20% 24% 18%	2711
	21st to end	Night	35% 4 8% 17% 22% 15%	2730
December	1st to 10th	Night	36% 4 6% 18% 23% 12%	4380
	11th to 20th	Night	39% 4 6% 10% 25% 17%	4947
	21st to end	Night	31% 3 4 17% 26% 19%	6633

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	16% 14% 38% 26% 5% 1	330
	11th to 20th	Day	19% 12% 37% 24% 6% 2	330
	21st to end	Day	20% 12% 42% 21% 6%	363
February	1st to 10th	Day	20% 15% 39% 21% 5%	330
	11th to 20th	Day	18% 18% 42% 19% 3	330
	21st to end	Day	18% 20% 39% 20% 3	273
March	1st to 10th	Day	20% 18% 38% 22% 3	330
	11th to 20th	Day	18% 19% 39% 18% 6%	321
	21st to end	Day	14% 17% 44% 21% 5%	330
April	1st to 10th	Day	18% 19% 44% 15% 5%	300
	11th to 20th	Day	15% 16% 44% 20% 4	338
	21st to end	Day	15% 16% 41% 21% 7% 1	675
May	1st to 10th	Day	14% 10% 39% 30% 8%	703
	11th to 20th	Day	17% 8% 31% 31% 10% 2	725
	21st to end	Day	13% 7% 29% 35% 14% 2	789
June	1st to 10th	Day	6% 3 18% 44% 24% 6%	730
	11th to 20th	Day	5% 2 18% 50% 22% 4	730
	21st to end	Day	5% 1 12% 38% 36% 9%	730
July	1st to 10th	Day	8% 2 8% 35% 33% 14%	721
	11th to 20th	Day	3 6% 36% 45% 10%	718
	21st to end	Day	4 1 5% 34% 44% 12%	794
August	1st to 10th	Day	2 3 32% 46% 16%	726
	11th to 20th	Day	6% 1 5% 33% 41% 15%	558
	21st to end	Day	5% 1 6% 27% 39% 22%	502
September	1st to 10th	Day	12% 2 5% 19% 43% 19%	330
	11th to 20th	Day	3 1 7% 24% 45% 20%	330
	21st to end	Day	11% 2 7% 31% 35% 14%	330
October	1st to 10th	Day	3 2 11% 35% 38% 12%	330
	11th to 20th	Day	7% 3 29% 33% 23% 5%	330
	21st to end	Day	18% 10% 25% 25% 20% 2	363
November	1st to 10th	Day	19% 6% 29% 29% 13% 4	330
	11th to 20th	Day	12% 12% 23% 34% 15% 4	330
	21st to end	Day	18% 15% 35% 18% 12% 2	330
December	1st to 10th	Day	17% 9% 35% 26% 10% 2	330
	11th to 20th	Day	14% 16% 36% 22% 9% 2	330
	21st to end	Day	16% 12% 36% 26% 7% 2	363
January	1st to 10th	Night	15% 10% 38% 30% 6%	1050
	11th to 20th	Night	14% 12% 36% 31% 7%	1050
	21st to end	Night	18% 12% 37% 28% 6%	1066
February	1st to 10th	Night	17% 12% 37% 30% 4	840
	11th to 20th	Night	18% 13% 40% 25% 4	824
	21st to end	Night	20% 11% 46% 21% 3	692
March	1st to 10th	Night	16% 14% 39% 28% 3	678
	11th to 20th	Night	16% 12% 39% 29% 4	621
	21st to end	Night	11% 12% 48% 25% 4	660
April	1st to 10th	Night	12% 11% 48% 26% 3	600
	11th to 20th	Night	13% 12% 45% 25% 4	593
	21st to end	Night	12% 11% 45% 25% 7%	600
May	1st to 10th	Night	14% 10% 43% 29% 5%	600
	11th to 20th	Night	10% 6% 39% 34% 10% 1	591
	21st to end	Night	10% 4 39% 34% 12%	650
June	1st to 10th	Night	4 1 26% 46% 21% 2	600
	11th to 20th	Night	4 2 27% 54% 13%	600
	21st to end	Night	3 2 16% 52% 25% 2	600
July	1st to 10th	Night	6% 2 10% 50% 30% 2	585
	11th to 20th	Night	3 1 9% 54% 31% 1	582
	21st to end	Night	3 8% 51% 36% 3	657
August	1st to 10th	Night	1 6% 53% 37% 3	597
	11th to 20th	Night	6% 1 6% 49% 35% 3	594
	21st to end	Night	5% 1 5% 43% 41% 6%	660
September	1st to 10th	Night	9% 1 10% 42% 34% 4	600
	11th to 20th	Night	11% 1 6% 43% 36% 3	600
	21st to end	Night	9% 1 11% 42% 34% 3	600
October	1st to 10th	Night	6% 1 14% 49% 28% 3	600
	11th to 20th	Night	10% 4 25% 42% 17% 1	722
	21st to end	Night	13% 9% 29% 32% 16% 1	880
November	1st to 10th	Night	13% 3 27% 43% 13% 1	820
	11th to 20th	Night	8% 8% 31% 38% 13% 1	1031
	21st to end	Night	17% 10% 32% 31% 10%	1050
December	1st to 10th	Night	13% 9% 33% 37% 8%	1050
	11th to 20th	Night	19% 10% 31% 34% 6%	1050
	21st to end	Night	17% 8% 34% 34% 8%	1155

Page generated at 2026-03-15 01:23:55. Version ac07

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