The Lone Wolf Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the The Lone Wolf Observatory clear sky chart from 2005-11-06 to 2024-03-06.

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	14% 9% 4 6% 6% 3 5% 5% 6% 7% 36%	78443
	Night	15% 10% 4 7% 5% 3 4 4 5% 6% 37%	81129
Transparency	Day	47% 7% 12% 21% 12% 2	78144
	Night	48% 6% 11% 21% 13% 2	80949
Seeing	Day	17% 11% 31% 25% 12% 4	14774
	Night	18% 11% 30% 29% 11% 1	24825

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	14% 14% 8% 8% 6% 3 5% 5% 5% 5% 26%	2527
	11th to 20th	Day	14% 14% 8% 12% 7% 3 5% 9% 7% 4 18%	2530
	21st to end	Day	20% 25% 6% 7% 4 2 3 3 3 6% 20%	2826
February	1st to 10th	Day	16% 13% 6% 7% 7% 4 5% 4 4 6% 27%	1779
	11th to 20th	Day	15% 10% 4 8% 7% 3 4 4 5% 6% 35%	1848
	21st to end	Day	14% 13% 5% 9% 6% 3 4 4 5% 6% 30%	1570
March	1st to 10th	Day	15% 14% 4 8% 6% 4 4 4 4 6% 30%	1850
	11th to 20th	Day	14% 9% 4 6% 5% 3 5% 4 5% 7% 36%	1846
	21st to end	Day	20% 12% 5% 8% 6% 3 5% 5% 5% 5% 26%	2376
April	1st to 10th	Day	17% 11% 5% 7% 5% 3 5% 4 5% 6% 31%	2160
	11th to 20th	Day	18% 8% 3 5% 5% 4 5% 5% 5% 6% 36%	2134
	21st to end	Day	20% 8% 3 6% 5% 3 4 4 6% 7% 33%	2272
May	1st to 10th	Day	17% 9% 3 6% 6% 4 5% 5% 6% 7% 31%	2340
	11th to 20th	Day	19% 8% 3 6% 5% 3 4 4 5% 8% 34%	2384
	21st to end	Day	13% 6% 2 7% 6% 3 4 6% 6% 8% 38%	2725
June	1st to 10th	Day	10% 5% 2 5% 5% 3 5% 5% 6% 8% 46%	2520
	11th to 20th	Day	10% 5% 2 6% 6% 3 4 5% 6% 7% 46%	2520
	21st to end	Day	11% 6% 2 5% 6% 4 5% 7% 7% 9% 38%	2520
July	1st to 10th	Day	8% 5% 2 4 5% 3 6% 4 7% 9% 46%	2520
	11th to 20th	Day	10% 4 2 5% 5% 3 5% 5% 6% 10% 45%	2520
	21st to end	Day	7% 3 2 5% 6% 4 6% 6% 7% 10% 44%	2743
August	1st to 10th	Day	8% 4 2 5% 7% 3 5% 6% 7% 9% 44%	2431
	11th to 20th	Day	9% 4 3 5% 5% 4 5% 6% 8% 8% 44%	2156
	21st to end	Day	8% 4 2 4 4 4 6% 6% 6% 10% 46%	2376
September	1st to 10th	Day	12% 6% 2 5% 5% 4 5% 4 5% 6% 45%	2160
	11th to 20th	Day	10% 6% 2 4 4 3 4 4 6% 8% 50%	2029
	21st to end	Day	10% 6% 2 6% 5% 3 4 6% 7% 8% 42%	1980
October	1st to 10th	Day	13% 8% 2 5% 5% 3 5% 4 5% 6% 44%	1960
	11th to 20th	Day	20% 8% 4 6% 5% 3 5% 4 5% 6% 35%	1774
	21st to end	Day	21% 9% 3 6% 5% 4 4 4 5% 7% 33%	1782
November	1st to 10th	Day	13% 8% 4 4 5% 3 4 4 5% 7% 44%	1672
	11th to 20th	Day	15% 10% 4 7% 5% 3 4 4 5% 7% 34%	1710
	21st to end	Day	19% 10% 4 7% 6% 2 4 4 4 4 36%	1682
December	1st to 10th	Day	15% 15% 5% 7% 6% 3 5% 5% 4 6% 29%	1520
	11th to 20th	Day	13% 14% 5% 9% 6% 3 5% 4 6% 5% 29%	1918
	21st to end	Day	22% 20% 7% 11% 7% 3 4 4 4 4 14%	2783
January	1st to 10th	Night	16% 15% 8% 10% 6% 3 4 3 4 4 28%	4428
	11th to 20th	Night	16% 18% 8% 11% 7% 3 4 6% 6% 4 18%	4440
	21st to end	Night	24% 18% 7% 8% 5% 3 4 3 3 4 21%	4838
February	1st to 10th	Night	17% 13% 5% 7% 6% 3 4 3 4 6% 31%	2399
	11th to 20th	Night	14% 11% 4 6% 6% 3 4 4 4 6% 37%	2218
	21st to end	Night	19% 11% 4 7% 5% 3 4 3 4 5% 34%	1884
March	1st to 10th	Night	16% 12% 5% 7% 5% 3 5% 4 4 4 35%	2227
	11th to 20th	Night	13% 7% 3 5% 5% 3 5% 4 6% 7% 42%	2120
	21st to end	Night	21% 10% 3 7% 5% 3 5% 4 5% 5% 32%	1990
April	1st to 10th	Night	15% 9% 3 6% 5% 3 5% 5% 5% 8% 37%	1800
	11th to 20th	Night	19% 7% 4 5% 5% 3 3 3 5% 6% 38%	1775
	21st to end	Night	19% 9% 3 6% 5% 4 4 5% 5% 6% 35%	1687
May	1st to 10th	Night	18% 7% 2 6% 6% 3 5% 5% 5% 8% 35%	1620
	11th to 20th	Night	17% 7% 3 5% 5% 4 4 4 5% 8% 39%	1507
	21st to end	Night	11% 4 3 7% 5% 3 5% 5% 7% 7% 42%	1551
June	1st to 10th	Night	10% 4 2 5% 5% 3 4 4 5% 8% 50%	1440
	11th to 20th	Night	8% 6% 2 5% 5% 3 4 5% 6% 9% 46%	1440
	21st to end	Night	11% 6% 2 5% 5% 3 5% 5% 6% 9% 43%	1440
July	1st to 10th	Night	7% 3 2 4 4 3 6% 5% 6% 10% 50%	1440
	11th to 20th	Night	8% 4 2 3 4 2 4 6% 6% 8% 52%	1440
	21st to end	Night	5% 3 2 4 4 3 6% 5% 8% 10% 51%	1575
August	1st to 10th	Night	7% 3 2 5% 5% 3 5% 5% 7% 9% 50%	1506
	11th to 20th	Night	6% 4 2 4 4 3 5% 5% 6% 9% 53%	1742
	21st to end	Night	8% 4 2 3 5% 3 4 4 5% 8% 54%	1980
September	1st to 10th	Night	10% 6% 3 5% 5% 3 3 4 5% 7% 51%	1800
	11th to 20th	Night	9% 5% 2 4 4 3 4 4 4 7% 54%	1912
	21st to end	Night	11% 4 3 6% 5% 3 4 5% 6% 8% 46%	1980
October	1st to 10th	Night	12% 5% 2 5% 4 3 4 4 5% 7% 49%	1998
	11th to 20th	Night	17% 7% 3 6% 5% 2 4 3 4 6% 44%	2186
	21st to end	Night	21% 9% 3 6% 5% 3 3 3 5% 6% 36%	2574
November	1st to 10th	Night	12% 9% 3 4 4 2 4 4 4 6% 47%	2406
	11th to 20th	Night	14% 9% 3 7% 5% 4 4 4 6% 6% 36%	2470
	21st to end	Night	18% 9% 4 6% 5% 3 5% 3 4 6% 37%	2493
December	1st to 10th	Night	17% 10% 4 9% 6% 3 4 5% 5% 6% 31%	2660
	11th to 20th	Night	16% 14% 5% 7% 5% 3 4 4 4 6% 32%	3279
	21st to end	Night	24% 18% 6% 9% 6% 4 4 4 4 5% 17%	4884

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	59% 6% 14% 14% 6%	2528
	11th to 20th	Day	65% 5% 11% 12% 8%	2530
	21st to end	Day	70% 4 7% 14% 5%	2826
February	1st to 10th	Day	59% 6% 12% 14% 9% 2	1779
	11th to 20th	Day	52% 4 11% 21% 10% 2	1858
	21st to end	Day	55% 7% 10% 19% 6% 2	1570
March	1st to 10th	Day	56% 6% 10% 20% 7% 1	1850
	11th to 20th	Day	48% 6% 12% 21% 11% 2	1846
	21st to end	Day	60% 6% 11% 17% 6% 1	2376
April	1st to 10th	Day	53% 7% 9% 19% 12%	2160
	11th to 20th	Day	48% 7% 10% 20% 11% 4	2134
	21st to end	Day	50% 7% 13% 17% 11% 2	2272
May	1st to 10th	Day	50% 8% 12% 22% 8%	2340
	11th to 20th	Day	48% 7% 12% 20% 12% 1	2388
	21st to end	Day	43% 8% 11% 20% 16% 2	2725
June	1st to 10th	Day	35% 8% 13% 26% 18% 1	2520
	11th to 20th	Day	36% 7% 11% 24% 20% 3	2520
	21st to end	Day	41% 10% 14% 20% 14% 2	2520
July	1st to 10th	Day	34% 8% 13% 25% 16% 3	2451
	11th to 20th	Day	34% 8% 15% 26% 15% 2	2445
	21st to end	Day	33% 9% 17% 24% 14% 3	2591
August	1st to 10th	Day	34% 9% 16% 28% 12% 2	2416
	11th to 20th	Day	34% 9% 14% 26% 15% 2	2156
	21st to end	Day	31% 8% 13% 26% 18% 4	2376
September	1st to 10th	Day	38% 6% 13% 23% 17% 4	2160
	11th to 20th	Day	32% 6% 13% 29% 18% 3	2029
	21st to end	Day	36% 8% 10% 25% 19% 1	1980
October	1st to 10th	Day	40% 6% 12% 24% 16% 3	1960
	11th to 20th	Day	50% 4 10% 22% 13% 1	1774
	21st to end	Day	52% 4 12% 21% 9% 1	1782
November	1st to 10th	Day	38% 5% 15% 23% 16% 2	1672
	11th to 20th	Day	49% 6% 13% 21% 11% 1	1710
	21st to end	Day	53% 5% 9% 23% 10%	1682
December	1st to 10th	Day	56% 5% 13% 18% 7%	1520
	11th to 20th	Day	56% 6% 11% 20% 7% 1	1915
	21st to end	Day	77% 4 7% 9% 3	2783
January	1st to 10th	Night	60% 4 12% 16% 7% 1	4428
	11th to 20th	Night	67% 5% 11% 11% 5%	4440
	21st to end	Night	67% 4 9% 14% 5%	4838
February	1st to 10th	Night	57% 4 11% 16% 10% 2	2399
	11th to 20th	Night	49% 4 11% 21% 13% 1	2219
	21st to end	Night	53% 4 10% 19% 11% 2	1884
March	1st to 10th	Night	53% 6% 10% 22% 9% 1	2227
	11th to 20th	Night	41% 6% 13% 21% 16% 3	2120
	21st to end	Night	54% 6% 10% 20% 9% 1	1990
April	1st to 10th	Night	45% 5% 13% 23% 13% 2	1800
	11th to 20th	Night	47% 5% 8% 20% 16% 4	1775
	21st to end	Night	49% 7% 9% 20% 14% 2	1687
May	1st to 10th	Night	46% 7% 13% 23% 11%	1620
	11th to 20th	Night	43% 6% 11% 23% 15% 1	1508
	21st to end	Night	39% 8% 14% 19% 16% 3	1552
June	1st to 10th	Night	32% 7% 13% 25% 20% 3	1440
	11th to 20th	Night	32% 6% 14% 23% 23% 2	1440
	21st to end	Night	38% 9% 13% 22% 16% 3	1440
July	1st to 10th	Night	29% 9% 15% 28% 15% 5%	1400
	11th to 20th	Night	27% 7% 15% 26% 23% 3	1392
	21st to end	Night	24% 7% 19% 27% 17% 5%	1487
August	1st to 10th	Night	28% 9% 16% 29% 16% 1	1497
	11th to 20th	Night	27% 8% 17% 25% 20% 2	1742
	21st to end	Night	27% 8% 11% 29% 20% 5%	1980
September	1st to 10th	Night	33% 5% 12% 25% 21% 3	1800
	11th to 20th	Night	29% 6% 8% 29% 25% 2	1912
	21st to end	Night	36% 7% 11% 28% 16% 3	1980
October	1st to 10th	Night	35% 6% 10% 26% 20% 3	1998
	11th to 20th	Night	42% 4 10% 24% 19% 2	2186
	21st to end	Night	49% 5% 11% 22% 12% 1	2574
November	1st to 10th	Night	38% 4 10% 25% 18% 3	2406
	11th to 20th	Night	48% 5% 12% 22% 12% 1	2470
	21st to end	Night	49% 4 12% 23% 11%	2493
December	1st to 10th	Night	53% 6% 12% 20% 8% 1	2660
	11th to 20th	Night	55% 5% 12% 18% 9% 1	3281
	21st to end	Night	71% 5% 8% 11% 4	4884

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	22% 16% 34% 22% 5%	270
	11th to 20th	Day	26% 18% 36% 14% 5% 1	270
	21st to end	Day	24% 18% 37% 18% 2 1	297
February	1st to 10th	Day	24% 17% 41% 16% 3	270
	11th to 20th	Day	27% 17% 36% 17% 3 1	270
	21st to end	Day	24% 20% 40% 12% 2	225
March	1st to 10th	Day	20% 22% 42% 14% 2	255
	11th to 20th	Day	28% 14% 35% 18% 5%	280
	21st to end	Day	29% 16% 29% 19% 6% 1	462
April	1st to 10th	Day	24% 15% 32% 22% 7%	420
	11th to 20th	Day	23% 18% 27% 21% 10% 1	412
	21st to end	Day	23% 15% 36% 16% 9% 1	420
May	1st to 10th	Day	22% 15% 30% 22% 7% 3	423
	11th to 20th	Day	20% 12% 33% 23% 11% 2	530
	21st to end	Day	14% 8% 33% 26% 13% 5%	679
June	1st to 10th	Day	10% 9% 32% 31% 14% 5%	630
	11th to 20th	Day	13% 7% 32% 29% 16% 3	630
	21st to end	Day	11% 9% 34% 29% 12% 4	630
July	1st to 10th	Day	9% 4 24% 30% 20% 12%	621
	11th to 20th	Day	12% 4 27% 32% 17% 8%	618
	21st to end	Day	8% 4 27% 36% 20% 5%	684
August	1st to 10th	Day	6% 3 22% 34% 24% 11%	550
	11th to 20th	Day	9% 5% 18% 31% 25% 11%	439
	21st to end	Day	8% 2 21% 38% 22% 8%	495
September	1st to 10th	Day	15% 5% 22% 32% 21% 5%	450
	11th to 20th	Day	11% 4 19% 31% 25% 10%	450
	21st to end	Day	12% 10% 26% 27% 18% 7%	450
October	1st to 10th	Day	18% 7% 28% 28% 14% 4	430
	11th to 20th	Day	20% 24% 33% 18% 4 1	270
	21st to end	Day	30% 13% 38% 14% 4	297
November	1st to 10th	Day	16% 13% 39% 23% 6% 3	270
	11th to 20th	Day	23% 18% 37% 16% 7%	270
	21st to end	Day	26% 12% 39% 20% 3	270
December	1st to 10th	Day	19% 22% 37% 17% 5%	270
	11th to 20th	Day	20% 17% 41% 20% 3	270
	21st to end	Day	26% 22% 38% 13% 1	297
January	1st to 10th	Night	20% 17% 36% 23% 3	950
	11th to 20th	Night	23% 17% 35% 20% 4 1	950
	21st to end	Night	22% 14% 36% 25% 4	1045
February	1st to 10th	Night	23% 13% 38% 22% 4	879
	11th to 20th	Night	21% 15% 35% 24% 3	743
	21st to end	Night	24% 17% 37% 19% 3	628
March	1st to 10th	Night	21% 14% 38% 21% 6%	743
	11th to 20th	Night	17% 12% 37% 27% 6% 1	720
	21st to end	Night	23% 13% 30% 25% 7% 1	604
April	1st to 10th	Night	20% 13% 34% 26% 6% 1	540
	11th to 20th	Night	21% 12% 33% 24% 9% 1	533
	21st to end	Night	22% 9% 33% 28% 8% 1	540
May	1st to 10th	Night	20% 6% 35% 30% 9%	540
	11th to 20th	Night	19% 5% 28% 34% 15% 1	531
	21st to end	Night	13% 5% 25% 36% 20% 1	584
June	1st to 10th	Night	10% 4 24% 46% 15% 1	540
	11th to 20th	Night	11% 5% 26% 41% 15% 1	540
	21st to end	Night	13% 3 25% 39% 19% 1	540
July	1st to 10th	Night	7% 2 18% 40% 28% 4	525
	11th to 20th	Night	7% 2 22% 39% 26% 2	522
	21st to end	Night	5% 3 19% 47% 25% 2	591
August	1st to 10th	Night	5% 1 13% 49% 27% 4	537
	11th to 20th	Night	7% 3 13% 40% 32% 4	534
	21st to end	Night	9% 2 18% 38% 30% 3	594
September	1st to 10th	Night	12% 4 19% 35% 26% 5%	540
	11th to 20th	Night	10% 5% 17% 36% 27% 4	652
	21st to end	Night	11% 7% 24% 33% 23% 3	720
October	1st to 10th	Night	14% 6% 26% 33% 19% 2	720
	11th to 20th	Night	20% 14% 31% 27% 7% 1	720
	21st to end	Night	27% 14% 29% 23% 7%	792
November	1st to 10th	Night	18% 12% 39% 20% 10% 2	740
	11th to 20th	Night	19% 18% 34% 23% 5% 1	760
	21st to end	Night	23% 13% 37% 22% 5%	783
December	1st to 10th	Night	21% 16% 38% 21% 4	950
	11th to 20th	Night	23% 14% 37% 23% 3	950
	21st to end	Night	30% 16% 33% 19% 2	1045

Page generated at 2024-03-03 05:28:55. Version ac07

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