Lone Wolf Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lone Wolf Observatory clear sky chart from 2005-11-06 to 2024-12-09.

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% 9% 3 8% 5% 4 4 4 6% 7% 38%	101645
	Night	13% 10% 3 8% 5% 4 4 3 5% 6% 39%	98199
Transparency	Day	43% 6% 12% 23% 14% 2	105210
	Night	43% 6% 11% 22% 15% 2	102775
Seeing	Day	16% 10% 29% 25% 16% 5%	15882
	Night	17% 9% 31% 30% 12% 1	25750

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	12% 12% 9% 15% 5% 6% 3 4 4 6% 25%	2527
	11th to 20th	Day	13% 11% 5% 15% 8% 7% 6% 5% 7% 4 19%	2530
	21st to end	Day	17% 20% 11% 12% 6% 4 3 2 4 5% 17%	3021
February	1st to 10th	Day	16% 12% 4 11% 6% 4 4 3 5% 5% 29%	1710
	11th to 20th	Day	14% 10% 3 8% 7% 5% 5% 3 5% 5% 34%	1842
	21st to end	Day	13% 15% 5% 12% 5% 3 3 2 5% 5% 30%	1570
March	1st to 10th	Day	17% 16% 4 7% 3 3 3 3 4 4 35%	3120
	11th to 20th	Day	9% 8% 3 7% 5% 4 5% 4 6% 7% 42%	3351
	21st to end	Day	20% 11% 5% 11% 5% 5% 5% 4 5% 6% 23%	4124
April	1st to 10th	Day	15% 13% 4 7% 4 4 4 3 5% 6% 35%	2280
	11th to 20th	Day	17% 9% 3 7% 4 4 4 4 5% 6% 37%	2254
	21st to end	Day	19% 9% 3 8% 5% 5% 4 4 5% 6% 34%	2299
May	1st to 10th	Day	16% 7% 3 7% 5% 4 4 4 6% 9% 33%	4082
	11th to 20th	Day	16% 7% 2 7% 4 3 4 3 5% 7% 41%	4383
	21st to end	Day	11% 6% 2 6% 5% 4 5% 4 7% 8% 44%	4824
June	1st to 10th	Day	9% 5% 2 6% 4 5% 5% 5% 6% 8% 45%	2660
	11th to 20th	Day	7% 5% 3 6% 5% 5% 5% 4 6% 8% 46%	2660
	21st to end	Day	10% 6% 3 6% 6% 5% 5% 5% 6% 8% 40%	2660
July	1st to 10th	Day	10% 7% 3 7% 5% 5% 5% 5% 8% 10% 34%	4440
	11th to 20th	Day	7% 4 2 5% 4 4 4 4 7% 10% 49%	4440
	21st to end	Day	8% 6% 2 7% 5% 5% 5% 5% 7% 10% 42%	4813
August	1st to 10th	Day	6% 5% 2 6% 4 5% 5% 5% 7% 10% 44%	4217
	11th to 20th	Day	10% 5% 2 6% 4 4 5% 5% 7% 11% 42%	3729
	21st to end	Day	6% 5% 2 6% 4 4 5% 4 7% 9% 49%	4180
September	1st to 10th	Day	11% 5% 3 4 4 4 4 4 6% 7% 49%	2280
	11th to 20th	Day	10% 5% 1 4 3 3 4 3 6% 8% 52%	2204
	21st to end	Day	8% 7% 3 6% 5% 4 5% 4 6% 7% 46%	2090
October	1st to 10th	Day	11% 8% 2 6% 4 4 4 3 4 7% 49%	1970
	11th to 20th	Day	16% 8% 2 7% 4 3 4 3 4 6% 43%	1900
	21st to end	Day	19% 9% 2 6% 4 4 4 3 5% 5% 38%	1943
November	1st to 10th	Day	11% 9% 2 6% 3 3 3 3 5% 7% 47%	1762
	11th to 20th	Day	17% 12% 4 7% 4 3 4 4 3 7% 36%	1800
	21st to end	Day	17% 13% 3 8% 4 4 3 3 5% 5% 35%	1695
December	1st to 10th	Day	14% 12% 5% 9% 5% 3 5% 3 4 5% 35%	1584
	11th to 20th	Day	14% 13% 4 11% 6% 5% 4 3 6% 6% 28%	1918
	21st to end	Day	22% 19% 8% 13% 6% 3 3 2 3 4 16%	2783
January	1st to 10th	Night	14% 14% 6% 11% 5% 4 3 3 5% 4 30%	4428
	11th to 20th	Night	13% 18% 6% 12% 6% 5% 5% 4 7% 4 21%	4440
	21st to end	Night	21% 17% 7% 11% 5% 4 3 2 3 4 22%	4630
February	1st to 10th	Night	16% 12% 5% 9% 6% 4 4 3 5% 6% 31%	2470
	11th to 20th	Night	13% 11% 4 8% 6% 5% 4 3 4 6% 37%	2223
	21st to end	Night	17% 12% 4 8% 4 4 4 3 4 5% 35%	1884
March	1st to 10th	Night	17% 12% 3 7% 4 3 4 3 4 5% 39%	3733
	11th to 20th	Night	11% 7% 3 5% 5% 4 4 3 5% 7% 46%	3625
	21st to end	Night	20% 12% 5% 10% 5% 4 4 4 5% 5% 25%	3505
April	1st to 10th	Night	15% 11% 3 6% 4 4 4 3 6% 6% 39%	1900
	11th to 20th	Night	16% 9% 2 6% 4 3 4 3 4 6% 43%	1875
	21st to end	Night	18% 8% 3 7% 4 4 3 4 5% 8% 37%	1880
May	1st to 10th	Night	16% 9% 3 7% 5% 4 5% 4 7% 8% 31%	2813
	11th to 20th	Night	14% 7% 2 6% 4 4 4 4 8% 8% 38%	2520
	21st to end	Night	9% 7% 2 6% 4 5% 4 4 5% 8% 44%	2743
June	1st to 10th	Night	9% 5% 2 6% 3 5% 4 4 5% 8% 51%	1520
	11th to 20th	Night	8% 4 2 6% 5% 5% 5% 3 6% 9% 47%	1520
	21st to end	Night	9% 6% 2 6% 5% 5% 5% 5% 5% 8% 45%	1520
July	1st to 10th	Night	11% 6% 2 7% 4 4 5% 4 6% 9% 40%	2530
	11th to 20th	Night	5% 4 2 5% 3 4 4 3 5% 7% 58%	2530
	21st to end	Night	5% 6% 2 7% 5% 4 5% 5% 6% 8% 46%	2750
August	1st to 10th	Night	5% 4 2 5% 4 3 6% 4 6% 8% 52%	2719
	11th to 20th	Night	6% 5% 2 6% 4 4 5% 4 7% 9% 49%	3100
	21st to end	Night	5% 4 2 5% 4 4 4 4 6% 9% 52%	3476
September	1st to 10th	Night	11% 5% 1 4 3 2 4 3 4 6% 56%	1900
	11th to 20th	Night	8% 3 1 5% 3 4 3 4 5% 8% 54%	1955
	21st to end	Night	8% 5% 2 6% 4 5% 4 5% 6% 9% 46%	2090
October	1st to 10th	Night	9% 6% 2 6% 4 4 3 3 4 6% 53%	2208
	11th to 20th	Night	15% 7% 2 5% 3 2 3 3 4 6% 49%	2280
	21st to end	Night	19% 9% 3 6% 4 4 3 3 5% 6% 38%	2654
November	1st to 10th	Night	11% 7% 2 5% 4 3 4 3 5% 6% 50%	2536
	11th to 20th	Night	13% 10% 4 7% 5% 4 4 3 5% 6% 40%	2600
	21st to end	Night	16% 10% 4 8% 4 3 4 3 4 5% 38%	2700
December	1st to 10th	Night	15% 11% 3 9% 5% 4 4 3 5% 6% 36%	2779
	11th to 20th	Night	14% 13% 6% 10% 5% 3 4 3 3 5% 34%	3279
	21st to end	Night	22% 18% 7% 12% 6% 5% 4 3 4 4 16%	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	61% 5% 10% 17% 6%	2528
	11th to 20th	Day	64% 6% 9% 12% 9% 1	2530
	21st to end	Day	70% 4 9% 12% 5%	3021
February	1st to 10th	Day	57% 5% 12% 17% 7% 2	1710
	11th to 20th	Day	51% 6% 12% 21% 9% 1	1852
	21st to end	Day	56% 4 9% 22% 7% 2	1570
March	1st to 10th	Day	52% 5% 10% 19% 12% 2	3120
	11th to 20th	Day	38% 7% 14% 26% 14% 1	3351
	21st to end	Day	59% 9% 14% 15% 3 1	4124
April	1st to 10th	Day	50% 6% 12% 21% 12%	2280
	11th to 20th	Day	47% 5% 10% 23% 12% 3	2254
	21st to end	Day	49% 6% 12% 18% 13% 2	2299
May	1st to 10th	Day	44% 8% 12% 25% 11%	4120
	11th to 20th	Day	42% 6% 10% 31% 10%	4387
	21st to end	Day	33% 7% 13% 21% 20% 5%	4837
June	1st to 10th	Day	33% 7% 13% 26% 17% 3	2660
	11th to 20th	Day	34% 7% 11% 21% 23% 3	2660
	21st to end	Day	40% 9% 12% 22% 16% 2	2660
July	1st to 10th	Day	42% 7% 13% 24% 11% 2	4371
	11th to 20th	Day	28% 6% 16% 31% 18% 1	4365
	21st to end	Day	36% 8% 18% 19% 17% 3	4662
August	1st to 10th	Day	32% 7% 19% 29% 13% 1	4202
	11th to 20th	Day	34% 6% 15% 28% 16% 1	3765
	21st to end	Day	30% 6% 12% 32% 16% 3	4179
September	1st to 10th	Day	34% 6% 12% 24% 20% 5%	2280
	11th to 20th	Day	29% 5% 11% 27% 23% 4	2204
	21st to end	Day	36% 6% 10% 26% 20% 2	2090
October	1st to 10th	Day	24% 3 6% 28% 36% 2	3269
	11th to 20th	Day	29% 3 10% 23% 32% 3	3140
	21st to end	Day	42% 4 8% 25% 17% 3	3181
November	1st to 10th	Day	37% 4 14% 26% 15% 3	1762
	11th to 20th	Day	49% 4 11% 22% 13% 1	1800
	21st to end	Day	52% 5% 11% 23% 10%	1695
December	1st to 10th	Day	53% 4 13% 22% 8% 1	1584
	11th to 20th	Day	56% 5% 10% 22% 6%	1915
	21st to end	Day	74% 5% 8% 9% 4	2783
January	1st to 10th	Night	55% 6% 11% 19% 8%	4428
	11th to 20th	Night	65% 4 11% 12% 8%	4440
	21st to end	Night	66% 4 9% 15% 6%	4630
February	1st to 10th	Night	54% 5% 11% 18% 11% 2	2470
	11th to 20th	Night	49% 5% 11% 23% 12% 1	2224
	21st to end	Night	52% 4 9% 21% 12% 2	1884
March	1st to 10th	Night	47% 6% 12% 22% 12% 2	3733
	11th to 20th	Night	36% 5% 12% 28% 17% 2	3625
	21st to end	Night	59% 7% 10% 18% 5% 1	3505
April	1st to 10th	Night	45% 5% 12% 23% 13% 2	1900
	11th to 20th	Night	43% 4 9% 24% 15% 5%	1875
	21st to end	Night	44% 7% 12% 21% 12% 4	1880
May	1st to 10th	Night	47% 8% 12% 20% 12% 2	2840
	11th to 20th	Night	39% 9% 15% 26% 10% 1	2521
	21st to end	Night	34% 8% 13% 21% 20% 4	2751
June	1st to 10th	Night	32% 6% 13% 26% 19% 4	1520
	11th to 20th	Night	32% 7% 13% 22% 22% 4	1520
	21st to end	Night	35% 8% 15% 22% 16% 4	1520
July	1st to 10th	Night	40% 7% 14% 23% 13% 3	2490
	11th to 20th	Night	24% 6% 13% 30% 25% 2	2482
	21st to end	Night	32% 9% 16% 20% 19% 5%	2662
August	1st to 10th	Night	27% 7% 18% 28% 18% 2	2710
	11th to 20th	Night	30% 7% 16% 28% 18% 1	3130
	21st to end	Night	28% 7% 12% 33% 17% 3	3476
September	1st to 10th	Night	30% 4 10% 25% 25% 5%	1900
	11th to 20th	Night	28% 5% 11% 28% 24% 5%	1955
	21st to end	Night	33% 6% 13% 26% 19% 3	2090
October	1st to 10th	Night	22% 4 7% 31% 32% 4	3689
	11th to 20th	Night	28% 4 8% 23% 33% 4	3779
	21st to end	Night	39% 4 9% 24% 21% 4	4366
November	1st to 10th	Night	35% 5% 11% 27% 18% 4	2536
	11th to 20th	Night	45% 4 12% 21% 15% 2	2600
	21st to end	Night	49% 4 10% 24% 13% 1	2700
December	1st to 10th	Night	50% 5% 12% 23% 9% 1	2779
	11th to 20th	Night	52% 5% 11% 22% 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	19% 16% 33% 25% 6%	270
	11th to 20th	Day	25% 20% 38% 11% 5% 1	270
	21st to end	Day	21% 20% 33% 20% 7%	297
February	1st to 10th	Day	23% 14% 41% 19% 3	270
	11th to 20th	Day	23% 16% 37% 18% 6%	270
	21st to end	Day	22% 15% 47% 13% 3	225
March	1st to 10th	Day	22% 22% 36% 17% 3	270
	11th to 20th	Day	24% 17% 36% 16% 7%	270
	21st to end	Day	31% 13% 36% 14% 6% 1	478
April	1st to 10th	Day	23% 13% 34% 23% 5% 1	460
	11th to 20th	Day	21% 16% 29% 20% 12% 2	452
	21st to end	Day	24% 13% 33% 21% 8% 1	460
May	1st to 10th	Day	20% 11% 34% 24% 9% 2	463
	11th to 20th	Day	22% 10% 30% 22% 13% 3	659
	21st to end	Day	15% 9% 29% 23% 16% 8%	734
June	1st to 10th	Day	9% 6% 28% 29% 23% 6%	680
	11th to 20th	Day	7% 5% 30% 33% 21% 4	680
	21st to end	Day	11% 8% 33% 28% 16% 5%	680
July	1st to 10th	Day	10% 3 18% 31% 23% 14%	671
	11th to 20th	Day	10% 4 21% 31% 24% 10%	668
	21st to end	Day	8% 3 20% 38% 25% 7%	739
August	1st to 10th	Day	7% 3 20% 34% 25% 11%	667
	11th to 20th	Day	10% 5% 17% 28% 28% 12%	479
	21st to end	Day	7% 2 19% 32% 31% 10%	539
September	1st to 10th	Day	13% 5% 18% 29% 29% 7%	490
	11th to 20th	Day	9% 3 15% 31% 29% 13%	490
	21st to end	Day	10% 10% 27% 24% 22% 7%	490
October	1st to 10th	Day	16% 5% 26% 30% 19% 4	370
	11th to 20th	Day	19% 20% 32% 21% 7% 1	300
	21st to end	Day	33% 11% 29% 22% 5% 1	330
November	1st to 10th	Day	16% 13% 38% 21% 9% 3	300
	11th to 20th	Day	24% 15% 36% 16% 9% 1	300
	21st to end	Day	23% 14% 37% 23% 4	300
December	1st to 10th	Day	16% 17% 41% 19% 6% 1	294
	11th to 20th	Day	19% 15% 37% 24% 5% 1	270
	21st to end	Day	24% 20% 39% 14% 3	297
January	1st to 10th	Night	17% 14% 41% 23% 5%	950
	11th to 20th	Night	21% 14% 39% 21% 5%	950
	21st to end	Night	21% 12% 36% 27% 4	1045
February	1st to 10th	Night	23% 12% 38% 24% 3	950
	11th to 20th	Night	18% 14% 37% 28% 4	748
	21st to end	Night	24% 14% 39% 19% 4	628
March	1st to 10th	Night	21% 15% 35% 24% 5%	760
	11th to 20th	Night	18% 10% 35% 30% 6%	663
	21st to end	Night	25% 11% 36% 21% 7% 1	627
April	1st to 10th	Night	21% 13% 35% 26% 5%	570
	11th to 20th	Night	21% 14% 30% 27% 8%	563
	21st to end	Night	21% 10% 33% 29% 7%	570
May	1st to 10th	Night	20% 7% 36% 29% 7% 1	570
	11th to 20th	Night	18% 6% 30% 35% 11% 1	561
	21st to end	Night	13% 4 29% 36% 17% 1	617
June	1st to 10th	Night	10% 3 24% 46% 16% 1	570
	11th to 20th	Night	10% 4 25% 44% 17% 1	570
	21st to end	Night	9% 2 32% 37% 18% 1	570
July	1st to 10th	Night	8% 2 15% 39% 31% 5%	555
	11th to 20th	Night	7% 3 18% 43% 28% 3	552
	21st to end	Night	5% 1 15% 47% 29% 2	624
August	1st to 10th	Night	6% 1 17% 42% 30% 4	567
	11th to 20th	Night	7% 1 13% 42% 32% 5%	564
	21st to end	Night	7% 2 16% 41% 32% 2	627
September	1st to 10th	Night	12% 4 18% 36% 27% 3	570
	11th to 20th	Night	10% 3 19% 36% 29% 3	625
	21st to end	Night	10% 8% 26% 33% 22% 2	760
October	1st to 10th	Night	11% 6% 27% 34% 20% 2	760
	11th to 20th	Night	20% 11% 30% 25% 13% 1	760
	21st to end	Night	24% 12% 33% 25% 7%	836
November	1st to 10th	Night	16% 10% 38% 27% 9% 1	780
	11th to 20th	Night	18% 15% 35% 26% 5%	800
	21st to end	Night	21% 12% 36% 25% 6%	900
December	1st to 10th	Night	21% 12% 38% 24% 5%	993
	11th to 20th	Night	21% 12% 33% 29% 5%	950
	21st to end	Night	28% 15% 33% 21% 3	1045

Page generated at 2024-12-06 02:54:47. Version ac07

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