Loggers Lake Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Loggers Lake Campground clear sky chart from 2005-11-06 to 2026-05-17.

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	12% 7% 3 6% 4 4 4 3 5% 7% 43%	131876
	Night	13% 8% 3 6% 4 4 4 3 5% 6% 45%	131220
Transparency	Day	39% 4 11% 26% 17% 4	135472
	Night	39% 3 10% 25% 19% 4	135702
Seeing	Day	18% 13% 27% 24% 14% 4	17554
	Night	18% 12% 29% 27% 13% 2	27450

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% 10% 3 8% 4 4 3 2 4 5% 44%	4886
	11th to 20th	Day	8% 7% 3 7% 4 4 4 3 4 6% 50%	5310
	21st to end	Day	18% 8% 3 6% 4 3 3 3 4 5% 44%	5812
February	1st to 10th	Day	17% 10% 3 7% 5% 4 4 4 4 5% 37%	1890
	11th to 20th	Day	17% 8% 2 7% 4 4 4 3 5% 6% 40%	2003
	21st to end	Day	16% 9% 3 6% 4 4 4 3 5% 6% 39%	1730
March	1st to 10th	Day	16% 12% 3 6% 3 3 3 3 4 5% 42%	4849
	11th to 20th	Day	10% 6% 2 4 3 3 3 3 4 7% 53%	5090
	21st to end	Day	15% 8% 2 6% 5% 4 5% 4 6% 8% 39%	5769
April	1st to 10th	Day	14% 7% 3 7% 3 4 4 3 5% 7% 44%	2520
	11th to 20th	Day	16% 8% 3 7% 5% 4 5% 3 5% 6% 39%	2494
	21st to end	Day	18% 7% 3 6% 5% 4 4 3 5% 7% 36%	2520
May	1st to 10th	Day	14% 8% 3 8% 5% 6% 6% 5% 7% 8% 29%	5525
	11th to 20th	Day	15% 8% 3 8% 5% 5% 4 4 6% 8% 34%	6204
	21st to end	Day	19% 7% 2 6% 4 4 4 3 5% 6% 39%	6935
June	1st to 10th	Day	9% 6% 2 7% 6% 5% 5% 4 6% 7% 43%	2800
	11th to 20th	Day	6% 4 2 6% 4 5% 5% 4 7% 9% 48%	2800
	21st to end	Day	5% 3 2 5% 6% 4 5% 5% 8% 10% 48%	2800
July	1st to 10th	Day	9% 5% 2 6% 5% 5% 5% 3 6% 9% 44%	6360
	11th to 20th	Day	5% 4 2 7% 4 5% 5% 5% 7% 12% 44%	6131
	21st to end	Day	6% 5% 3 7% 5% 5% 6% 5% 7% 11% 40%	6422
August	1st to 10th	Day	4 3 1 4 4 4 5% 4 7% 10% 54%	4234
	11th to 20th	Day	11% 6% 2 6% 4 5% 5% 4 6% 8% 43%	3857
	21st to end	Day	7% 4 2 4 4 4 5% 4 6% 8% 52%	4312
September	1st to 10th	Day	11% 5% 2 4 4 4 4 4 6% 7% 49%	2400
	11th to 20th	Day	10% 5% 2 6% 4 4 5% 4 6% 7% 47%	2400
	21st to end	Day	10% 6% 2 4 4 4 4 4 4 7% 52%	2142
October	1st to 10th	Day	9% 5% 2 4 4 4 3 2 5% 6% 56%	2000
	11th to 20th	Day	14% 6% 2 5% 3 3 3 2 4 5% 55%	2000
	21st to end	Day	18% 8% 3 5% 2 3 3 2 4 5% 47%	2200
November	1st to 10th	Day	13% 6% 2 5% 3 3 3 3 4 5% 53%	1932
	11th to 20th	Day	13% 7% 3 5% 4 3 3 3 4 6% 49%	1890
	21st to end	Day	18% 10% 2 6% 4 2 3 2 3 5% 44%	1811
December	1st to 10th	Day	10% 9% 3 7% 4 3 3 3 4 5% 50%	2690
	11th to 20th	Day	14% 10% 4 8% 4 3 4 3 4 6% 41%	3088
	21st to end	Day	19% 20% 4 7% 4 4 4 3 4 4 28%	4070
January	1st to 10th	Night	14% 9% 5% 9% 4 4 3 3 4 5% 39%	8034
	11th to 20th	Night	9% 8% 3 8% 5% 3 3 3 4 5% 50%	7680
	21st to end	Night	16% 9% 3 7% 5% 4 3 3 4 5% 40%	8402
February	1st to 10th	Night	16% 11% 3 6% 4 3 3 3 5% 6% 41%	2730
	11th to 20th	Night	17% 8% 3 8% 3 3 3 2 5% 7% 42%	2500
	21st to end	Night	17% 8% 3 6% 3 4 4 3 4 5% 43%	2076
March	1st to 10th	Night	18% 11% 3 7% 4 3 3 2 4 4 41%	5267
	11th to 20th	Night	11% 8% 3 6% 3 3 4 3 4 6% 48%	5090
	21st to end	Night	14% 8% 3 7% 5% 4 4 4 5% 7% 39%	5401
April	1st to 10th	Night	11% 6% 2 5% 3 3 4 3 5% 8% 50%	2100
	11th to 20th	Night	15% 7% 3 7% 5% 3 3 3 4 6% 44%	2075
	21st to end	Night	19% 7% 2 6% 4 4 3 3 5% 6% 41%	2100
May	1st to 10th	Night	17% 7% 3 6% 4 3 5% 4 6% 8% 37%	4590
	11th to 20th	Night	14% 8% 3 6% 4 4 4 4 6% 8% 40%	3824
	21st to end	Night	19% 10% 3 6% 5% 4 4 3 5% 7% 36%	3942
June	1st to 10th	Night	9% 4 2 6% 4 5% 4 4 7% 7% 48%	1600
	11th to 20th	Night	6% 3 2 3 3 3 3 3 7% 10% 56%	1600
	21st to end	Night	3 3 1 3 4 3 4 4 7% 11% 58%	1600
July	1st to 10th	Night	9% 5% 2 7% 4 4 4 4 6% 10% 46%	3618
	11th to 20th	Night	4 4 2 5% 4 4 5% 3 6% 9% 54%	3840
	21st to end	Night	6% 5% 2 6% 4 4 5% 4 7% 9% 47%	4449
August	1st to 10th	Night	3 2 1 4 3 3 4 4 6% 8% 61%	2926
	11th to 20th	Night	8% 5% 2 6% 4 5% 4 4 6% 8% 48%	3191
	21st to end	Night	5% 4 2 4 3 3 3 4 6% 8% 58%	3586
September	1st to 10th	Night	10% 4 2 5% 3 3 5% 4 5% 7% 53%	2000
	11th to 20th	Night	9% 5% 2 5% 3 4 4 4 5% 7% 52%	2000
	21st to end	Night	9% 5% 2 5% 3 3 4 3 5% 6% 54%	2233
October	1st to 10th	Night	7% 5% 1 3 3 3 3 3 4 7% 62%	2400
	11th to 20th	Night	13% 6% 1 4 3 2 2 3 4 5% 56%	2400
	21st to end	Night	20% 7% 2 4 3 3 3 2 4 5% 48%	2640
November	1st to 10th	Night	11% 6% 2 4 3 3 3 2 5% 5% 56%	2583
	11th to 20th	Night	14% 6% 2 5% 3 3 4 3 5% 6% 50%	2730
	21st to end	Night	18% 9% 2 5% 4 3 2 3 4 5% 45%	2804
December	1st to 10th	Night	12% 9% 2 5% 3 3 4 3 5% 6% 47%	4720
	11th to 20th	Night	17% 9% 3 6% 4 4 3 2 4 5% 44%	5339
	21st to end	Night	24% 16% 4 7% 4 4 3 3 4 4 27%	7150

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	45% 2 10% 26% 14% 2	4887
	11th to 20th	Day	36% 2 6% 29% 20% 6%	5310
	21st to end	Day	44% 2 9% 19% 16% 10%	5812
February	1st to 10th	Day	50% 3 10% 22% 13% 1	1890
	11th to 20th	Day	45% 3 11% 21% 15% 5%	2013
	21st to end	Day	45% 4 7% 23% 14% 7%	1730
March	1st to 10th	Day	46% 2 5% 22% 14% 10%	4849
	11th to 20th	Day	32% 2 8% 26% 22% 9%	5090
	21st to end	Day	43% 3 14% 27% 12% 1	5771
April	1st to 10th	Day	39% 4 12% 24% 19% 2	2520
	11th to 20th	Day	46% 3 10% 21% 16% 4	2494
	21st to end	Day	48% 4 12% 21% 14% 1	2520
May	1st to 10th	Day	50% 5% 12% 20% 12% 1	5560
	11th to 20th	Day	48% 5% 12% 21% 13% 1	6208
	21st to end	Day	46% 4 7% 25% 16% 2	6949
June	1st to 10th	Day	39% 5% 12% 26% 16% 1	2800
	11th to 20th	Day	31% 6% 12% 29% 19% 3	2800
	21st to end	Day	28% 7% 19% 25% 17% 4	2800
July	1st to 10th	Day	36% 6% 11% 27% 18% 2	6291
	11th to 20th	Day	32% 8% 16% 31% 12% 2	6056
	21st to end	Day	34% 9% 15% 30% 12% 1	6240
August	1st to 10th	Day	24% 5% 17% 33% 21%	4220
	11th to 20th	Day	38% 5% 12% 26% 17% 2	3893
	21st to end	Day	29% 6% 15% 35% 12% 4	4311
September	1st to 10th	Day	34% 4 12% 28% 17% 6%	2400
	11th to 20th	Day	35% 5% 8% 26% 25% 1	2400
	21st to end	Day	32% 5% 7% 27% 26% 3	2142
October	1st to 10th	Day	18% 3 5% 18% 44% 12%	3260
	11th to 20th	Day	24% 2 5% 22% 39% 9%	3240
	21st to end	Day	31% 2 7% 32% 24% 4	3538
November	1st to 10th	Day	35% 3 9% 26% 21% 6%	1932
	11th to 20th	Day	37% 2 8% 25% 21% 7%	1890
	21st to end	Day	45% 2 8% 26% 18% 2	1811
December	1st to 10th	Day	37% 3 8% 37% 14% 1	2690
	11th to 20th	Day	46% 3 7% 24% 19% 2	3085
	21st to end	Day	60% 2 10% 15% 10% 2	4070
January	1st to 10th	Night	48% 2 11% 25% 13% 1	8035
	11th to 20th	Night	38% 2 7% 25% 25% 4	7680
	21st to end	Night	47% 2 8% 21% 18% 4	8402
February	1st to 10th	Night	45% 3 11% 24% 15% 2	2730
	11th to 20th	Night	43% 3 11% 22% 17% 3	2501
	21st to end	Night	44% 2 7% 23% 19% 5%	2076
March	1st to 10th	Night	48% 2 6% 22% 15% 7%	5267
	11th to 20th	Night	39% 3 8% 23% 18% 9%	5090
	21st to end	Night	44% 3 13% 26% 13% 1	5401
April	1st to 10th	Night	34% 3 13% 24% 21% 4	2100
	11th to 20th	Night	41% 3 10% 24% 16% 5%	2075
	21st to end	Night	44% 4 9% 26% 15% 2	2100
May	1st to 10th	Night	44% 6% 16% 22% 12% 1	4620
	11th to 20th	Night	43% 5% 13% 24% 13% 3	3825
	21st to end	Night	49% 4 9% 23% 12% 3	3950
June	1st to 10th	Night	33% 4 17% 24% 20% 2	1600
	11th to 20th	Night	23% 4 14% 35% 21% 4	1600
	21st to end	Night	20% 6% 18% 30% 19% 7%	1600
July	1st to 10th	Night	34% 6% 13% 23% 21% 2	3580
	11th to 20th	Night	26% 8% 16% 33% 15% 2	3795
	21st to end	Night	30% 8% 19% 30% 13% 1	4320
August	1st to 10th	Night	20% 5% 18% 34% 22% 1	2916
	11th to 20th	Night	33% 6% 16% 26% 15% 3	3221
	21st to end	Night	23% 5% 14% 38% 17% 3	3586
September	1st to 10th	Night	30% 5% 10% 29% 21% 5%	2000
	11th to 20th	Night	31% 6% 10% 26% 25% 2	2000
	21st to end	Night	31% 4 9% 24% 28% 4	2233
October	1st to 10th	Night	15% 2 6% 17% 45% 15%	3920
	11th to 20th	Night	23% 2 6% 21% 33% 15%	3899
	21st to end	Night	31% 3 7% 26% 28% 5%	4252
November	1st to 10th	Night	31% 3 10% 28% 23% 5%	2583
	11th to 20th	Night	36% 2 7% 25% 23% 7%	2730
	21st to end	Night	43% 2 7% 25% 21% 2	2804
December	1st to 10th	Night	38% 3 9% 32% 17% 1	4720
	11th to 20th	Night	45% 2 8% 23% 20% 2	5341
	21st to end	Night	62% 2 10% 18% 7% 1	7150

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	27% 22% 36% 12% 2	330
	11th to 20th	Day	30% 26% 32% 11% 1	330
	21st to end	Day	23% 30% 34% 11% 1	363
February	1st to 10th	Day	27% 24% 34% 12% 3	330
	11th to 20th	Day	36% 23% 30% 8% 1 1	330
	21st to end	Day	34% 20% 34% 10% 1	273
March	1st to 10th	Day	28% 22% 35% 12% 2	330
	11th to 20th	Day	34% 22% 31% 10% 2	330
	21st to end	Day	32% 22% 33% 11% 2	446
April	1st to 10th	Day	25% 18% 34% 18% 5%	540
	11th to 20th	Day	27% 22% 29% 15% 6% 1	532
	21st to end	Day	25% 18% 33% 19% 5% 1	540
May	1st to 10th	Day	20% 22% 33% 18% 6% 1	543
	11th to 20th	Day	19% 13% 31% 23% 11% 3	735
	21st to end	Day	16% 10% 32% 25% 13% 3	789
June	1st to 10th	Day	11% 7% 25% 30% 22% 5%	730
	11th to 20th	Day	6% 5% 23% 39% 22% 5%	730
	21st to end	Day	4 7% 28% 37% 19% 5%	730
July	1st to 10th	Day	10% 4 17% 30% 31% 9%	721
	11th to 20th	Day	4 4 21% 36% 29% 5%	718
	21st to end	Day	8% 3 15% 36% 29% 8%	794
August	1st to 10th	Day	8% 3 17% 40% 26% 6%	726
	11th to 20th	Day	15% 3 17% 30% 28% 7%	527
	21st to end	Day	12% 2 14% 31% 29% 11%	583
September	1st to 10th	Day	12% 3 19% 34% 24% 8%	530
	11th to 20th	Day	10% 4 16% 31% 27% 12%	530
	21st to end	Day	16% 8% 23% 27% 19% 7%	458
October	1st to 10th	Day	11% 9% 29% 35% 12% 5%	330
	11th to 20th	Day	20% 16% 33% 22% 8% 1	330
	21st to end	Day	32% 17% 32% 16% 3	363
November	1st to 10th	Day	19% 16% 33% 25% 5% 2	330
	11th to 20th	Day	22% 17% 36% 15% 10%	330
	21st to end	Day	33% 17% 26% 17% 5% 2	330
December	1st to 10th	Day	22% 22% 33% 15% 5% 1	330
	11th to 20th	Day	26% 22% 32% 13% 6%	330
	21st to end	Day	31% 23% 32% 10% 3	363
January	1st to 10th	Night	23% 21% 34% 18% 3	1050
	11th to 20th	Night	24% 22% 35% 15% 3	1050
	21st to end	Night	21% 20% 38% 19% 2	1155
February	1st to 10th	Night	25% 17% 38% 19% 1	1050
	11th to 20th	Night	25% 19% 37% 17% 2	865
	21st to end	Night	26% 19% 35% 18% 1	692
March	1st to 10th	Night	26% 15% 34% 22% 2	744
	11th to 20th	Night	25% 15% 33% 22% 4	630
	21st to end	Night	25% 16% 35% 20% 4	693
April	1st to 10th	Night	16% 18% 38% 24% 4	630
	11th to 20th	Night	20% 17% 31% 26% 6%	623
	21st to end	Night	21% 11% 39% 20% 7%	630
May	1st to 10th	Night	18% 8% 36% 29% 9%	630
	11th to 20th	Night	19% 6% 32% 28% 14% 2	609
	21st to end	Night	13% 7% 26% 34% 16% 4	650
June	1st to 10th	Night	10% 5% 19% 35% 29% 2	600
	11th to 20th	Night	7% 2 21% 45% 24% 2	600
	21st to end	Night	4 3 22% 39% 31% 2	600
July	1st to 10th	Night	10% 2 12% 33% 34% 9%	585
	11th to 20th	Night	4 1 13% 45% 32% 5%	582
	21st to end	Night	7% 2 11% 40% 34% 6%	657
August	1st to 10th	Night	6% 1 12% 42% 36% 4	597
	11th to 20th	Night	8% 1 13% 37% 37% 3	594
	21st to end	Night	8% 2 11% 33% 39% 7%	660
September	1st to 10th	Night	10% 3 15% 38% 30% 4	600
	11th to 20th	Night	12% 3 13% 34% 34% 5%	600
	21st to end	Night	12% 6% 24% 28% 27% 3	765
October	1st to 10th	Night	9% 5% 24% 34% 24% 3	800
	11th to 20th	Night	16% 13% 29% 29% 13% 1	800
	21st to end	Night	26% 12% 29% 25% 7%	880
November	1st to 10th	Night	15% 11% 36% 28% 10%	820
	11th to 20th	Night	19% 13% 33% 28% 7%	840
	21st to end	Night	25% 14% 32% 22% 6%	914
December	1st to 10th	Night	23% 16% 33% 24% 4	1050
	11th to 20th	Night	26% 14% 31% 25% 5%	1050
	21st to end	Night	29% 17% 32% 20% 3	1155

Page generated at 2026-05-14 00:58:57. Version ac07

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