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 2024-08-15.

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% 7% 3 6% 4 4 4 4 5% 7% 42%	95405
	Night	14% 7% 3 6% 4 3 4 3 5% 7% 45%	93349
Transparency	Day	41% 4 11% 25% 16% 3	95167
	Night	40% 3 11% 25% 17% 3	93194
Seeing	Day	18% 12% 26% 25% 15% 4	15262
	Night	18% 11% 28% 27% 14% 2	25048

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% 11% 4 7% 4 4 3 3 4 5% 41%	2624
	11th to 20th	Day	14% 10% 3 6% 4 4 4 3 3 5% 44%	2850
	21st to end	Day	24% 9% 3 6% 3 3 3 3 4 4 39%	3135
February	1st to 10th	Day	17% 10% 3 7% 5% 4 4 4 4 5% 37%	1710
	11th to 20th	Day	16% 9% 2 6% 4 4 4 3 5% 6% 40%	1807
	21st to end	Day	17% 10% 3 6% 4 4 4 3 5% 6% 38%	1570
March	1st to 10th	Day	20% 11% 3 6% 3 3 3 3 4 4 39%	3300
	11th to 20th	Day	13% 7% 2 5% 3 3 3 3 4 6% 51%	3480
	21st to end	Day	16% 8% 3 5% 4 4 5% 4 6% 7% 39%	3940
April	1st to 10th	Day	12% 7% 3 7% 4 4 4 3 5% 7% 45%	2280
	11th to 20th	Day	17% 8% 3 7% 5% 3 4 3 5% 6% 40%	2254
	21st to end	Day	19% 8% 3 7% 5% 4 4 3 5% 6% 36%	2280
May	1st to 10th	Day	14% 8% 3 7% 5% 5% 6% 5% 7% 9% 32%	3765
	11th to 20th	Day	17% 6% 3 7% 5% 4 4 3 5% 7% 38%	4260
	21st to end	Day	14% 7% 2 6% 5% 5% 4 4 6% 7% 40%	4824
June	1st to 10th	Day	9% 6% 2 7% 6% 5% 5% 4 6% 7% 43%	2660
	11th to 20th	Day	6% 4 2 6% 4 5% 5% 4 7% 9% 49%	2660
	21st to end	Day	5% 3 2 4 5% 4 6% 5% 8% 10% 48%	2660
July	1st to 10th	Day	11% 5% 2 6% 5% 5% 5% 4 7% 9% 41%	4440
	11th to 20th	Day	4 3 2 6% 4 5% 5% 4 6% 12% 49%	4281
	21st to end	Day	7% 6% 3 8% 6% 7% 6% 6% 7% 10% 34%	4465
August	1st to 10th	Day	7% 4 2 6% 5% 5% 6% 5% 8% 11% 41%	2458
	11th to 20th	Day	11% 6% 2 7% 5% 6% 6% 5% 7% 9% 38%	2182
	21st to end	Day	10% 5% 2 5% 4 4 6% 4 5% 9% 45%	2376
September	1st to 10th	Day	12% 5% 2 4 4 4 4 4 6% 8% 47%	2160
	11th to 20th	Day	10% 5% 2 6% 4 4 5% 4 5% 8% 47%	2160
	21st to end	Day	9% 6% 1 4 4 3 4 3 4 6% 54%	1930
October	1st to 10th	Day	10% 5% 2 5% 4 4 3 3 5% 7% 53%	1800
	11th to 20th	Day	15% 6% 3 5% 3 3 3 2 4 4 53%	1800
	21st to end	Day	18% 8% 3 5% 2 3 3 2 4 5% 46%	1980
November	1st to 10th	Day	13% 6% 2 5% 3 3 3 3 5% 5% 53%	1744
	11th to 20th	Day	13% 7% 2 5% 4 3 3 3 5% 6% 48%	1710
	21st to end	Day	18% 10% 2 6% 4 2 3 3 3 5% 44%	1639
December	1st to 10th	Day	15% 8% 3 7% 4 3 4 3 5% 6% 41%	1520
	11th to 20th	Day	15% 11% 4 8% 4 3 4 3 4 5% 39%	1918
	21st to end	Day	16% 17% 4 7% 4 4 4 3 5% 5% 32%	2783
January	1st to 10th	Night	15% 8% 5% 8% 4 3 4 3 4 5% 39%	4328
	11th to 20th	Night	14% 8% 3 8% 5% 4 4 3 5% 6% 40%	4120
	21st to end	Night	22% 12% 4 6% 3 3 3 3 4 5% 36%	4532
February	1st to 10th	Night	16% 11% 3 6% 4 4 3 3 5% 6% 40%	2470
	11th to 20th	Night	15% 8% 3 8% 3 3 3 2 5% 7% 43%	2256
	21st to end	Night	18% 9% 3 6% 3 4 4 3 4 5% 41%	1884
March	1st to 10th	Night	22% 10% 2 6% 3 3 2 2 4 5% 42%	3582
	11th to 20th	Night	14% 7% 2 5% 3 3 3 3 4 5% 49%	3480
	21st to end	Night	14% 10% 4 7% 5% 4 4 4 5% 7% 36%	3690
April	1st to 10th	Night	10% 6% 2 5% 3 3 4 3 5% 7% 51%	1900
	11th to 20th	Night	14% 6% 3 7% 5% 3 3 3 5% 6% 44%	1875
	21st to end	Night	19% 7% 2 6% 4 4 3 2 5% 6% 41%	1900
May	1st to 10th	Night	18% 6% 2 4 3 3 4 3 6% 7% 43%	3130
	11th to 20th	Night	14% 8% 2 6% 3 4 3 3 6% 8% 42%	2626
	21st to end	Night	13% 9% 2 7% 5% 4 4 3 6% 9% 37%	2743
June	1st to 10th	Night	8% 4 2 6% 4 5% 4 4 7% 7% 49%	1520
	11th to 20th	Night	6% 3 2 3 3 3 3 3 7% 10% 58%	1520
	21st to end	Night	3 3 1 3 3 3 4 4 7% 11% 57%	1520
July	1st to 10th	Night	10% 5% 2 5% 4 4 4 4 6% 10% 47%	2530
	11th to 20th	Night	5% 3 2 4 3 3 4 2 6% 8% 62%	2683
	21st to end	Night	8% 6% 3 7% 5% 5% 6% 4 7% 8% 41%	3098
August	1st to 10th	Night	5% 3 1 5% 4 5% 5% 5% 8% 9% 50%	1701
	11th to 20th	Night	6% 4 2 5% 4 4 4 4 6% 8% 52%	1817
	21st to end	Night	7% 4 2 4 4 3 4 3 7% 8% 53%	1980
September	1st to 10th	Night	9% 5% 2 5% 3 3 5% 3 4 7% 54%	1800
	11th to 20th	Night	9% 5% 2 5% 3 4 4 3 5% 7% 53%	1800
	21st to end	Night	9% 5% 2 5% 3 3 4 3 5% 6% 56%	2008
October	1st to 10th	Night	7% 5% 2 3 3 3 3 3 4 7% 60%	2160
	11th to 20th	Night	14% 6% 1 5% 4 2 3 3 4 5% 54%	2160
	21st to end	Night	20% 7% 2 5% 3 3 3 2 4 5% 48%	2376
November	1st to 10th	Night	11% 6% 2 4 3 3 3 2 5% 5% 57%	2331
	11th to 20th	Night	14% 6% 2 5% 4 3 4 3 5% 5% 49%	2470
	21st to end	Night	19% 9% 2 5% 4 2 2 3 4 5% 45%	2536
December	1st to 10th	Night	17% 9% 2 6% 4 4 4 3 5% 8% 39%	2660
	11th to 20th	Night	17% 9% 3 7% 4 4 3 2 4 6% 40%	3279
	21st to end	Night	19% 16% 5% 8% 5% 4 4 3 4 5% 27%	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	46% 2 8% 28% 14% 2	2625
	11th to 20th	Day	44% 2 9% 25% 16% 4	2850
	21st to end	Day	50% 1 9% 17% 17% 6%	3135
February	1st to 10th	Day	50% 3 9% 23% 13% 2	1710
	11th to 20th	Day	44% 3 12% 21% 15% 5%	1817
	21st to end	Day	47% 4 7% 23% 12% 7%	1570
March	1st to 10th	Day	50% 3 6% 22% 11% 8%	3300
	11th to 20th	Day	36% 2 10% 28% 17% 7%	3480
	21st to end	Day	45% 2 17% 22% 13% 1	3940
April	1st to 10th	Day	38% 4 11% 25% 20% 2	2280
	11th to 20th	Day	46% 3 10% 21% 17% 4	2254
	21st to end	Day	49% 4 11% 20% 15% 1	2280
May	1st to 10th	Day	48% 4 14% 21% 12% 1	3800
	11th to 20th	Day	46% 3 13% 24% 12% 1	4264
	21st to end	Day	43% 4 9% 25% 18% 1	4837
June	1st to 10th	Day	39% 5% 13% 26% 16% 1	2660
	11th to 20th	Day	30% 6% 12% 29% 20% 3	2660
	21st to end	Day	28% 7% 18% 25% 17% 5%	2660
July	1st to 10th	Day	39% 6% 12% 29% 12% 2	4371
	11th to 20th	Day	27% 6% 13% 35% 17% 2	4206
	21st to end	Day	41% 9% 15% 26% 8% 1	4325
August	1st to 10th	Day	34% 6% 15% 27% 16% 1	2444
	11th to 20th	Day	41% 5% 13% 27% 13% 1	2182
	21st to end	Day	35% 6% 14% 24% 15% 6%	2376
September	1st to 10th	Day	35% 4 12% 29% 15% 5%	2160
	11th to 20th	Day	34% 6% 8% 26% 25% 2	2160
	21st to end	Day	31% 4 7% 29% 26% 3	1930
October	1st to 10th	Day	31% 5% 9% 25% 26% 3	1800
	11th to 20th	Day	37% 2 7% 25% 23% 6%	1800
	21st to end	Day	42% 2 7% 26% 18% 5%	1980
November	1st to 10th	Day	34% 3 10% 26% 21% 7%	1744
	11th to 20th	Day	37% 2 7% 25% 22% 6%	1710
	21st to end	Day	45% 2 8% 25% 18% 2	1639
December	1st to 10th	Day	44% 3 10% 28% 13% 2	1520
	11th to 20th	Day	50% 3 6% 20% 20% 1	1915
	21st to end	Day	55% 2 10% 17% 13% 3	2783
January	1st to 10th	Night	48% 2 9% 25% 15% 2	4328
	11th to 20th	Night	46% 1 10% 27% 13% 2	4120
	21st to end	Night	53% 2 9% 22% 14% 1	4532
February	1st to 10th	Night	46% 3 10% 24% 15% 2	2470
	11th to 20th	Night	42% 3 11% 22% 18% 3	2257
	21st to end	Night	46% 2 7% 23% 17% 5%	1884
March	1st to 10th	Night	47% 2 8% 23% 14% 6%	3582
	11th to 20th	Night	38% 3 11% 25% 19% 5%	3480
	21st to end	Night	47% 2 13% 27% 10%	3690
April	1st to 10th	Night	33% 4 12% 25% 22% 4	1900
	11th to 20th	Night	41% 3 10% 25% 16% 5%	1875
	21st to end	Night	44% 4 10% 26% 15% 2	1900
May	1st to 10th	Night	40% 4 17% 24% 14% 2	3160
	11th to 20th	Night	40% 5% 15% 23% 16% 1	2627
	21st to end	Night	45% 4 11% 24% 14% 2	2751
June	1st to 10th	Night	33% 4 17% 24% 20% 2	1520
	11th to 20th	Night	21% 3 14% 36% 21% 4	1520
	21st to end	Night	20% 6% 18% 30% 19% 8%	1520
July	1st to 10th	Night	34% 5% 16% 27% 15% 3	2490
	11th to 20th	Night	20% 5% 13% 39% 20% 3	2635
	21st to end	Night	37% 8% 16% 27% 11% 1	2999
August	1st to 10th	Night	28% 6% 17% 32% 15% 2	1691
	11th to 20th	Night	29% 5% 15% 30% 19% 2	1817
	21st to end	Night	28% 5% 14% 27% 20% 5%	1980
September	1st to 10th	Night	30% 4 10% 31% 20% 5%	1800
	11th to 20th	Night	30% 6% 10% 26% 26% 2	1800
	21st to end	Night	29% 4 9% 26% 29% 4	2008
October	1st to 10th	Night	26% 3 11% 29% 26% 5%	2160
	11th to 20th	Night	34% 2 7% 27% 25% 5%	2160
	21st to end	Night	41% 3 7% 23% 21% 6%	2376
November	1st to 10th	Night	31% 3 10% 28% 23% 6%	2331
	11th to 20th	Night	37% 2 7% 24% 23% 6%	2470
	21st to end	Night	43% 2 7% 25% 21% 2	2536
December	1st to 10th	Night	45% 3 10% 23% 17% 2	2660
	11th to 20th	Night	47% 2 7% 24% 18% 2	3281
	21st to end	Night	60% 2 9% 17% 10% 2	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	28% 21% 35% 13% 2	270
	11th to 20th	Day	34% 23% 30% 12% 1	270
	21st to end	Day	23% 31% 32% 13% 1	297
February	1st to 10th	Day	29% 24% 32% 12% 4	270
	11th to 20th	Day	34% 22% 30% 10% 1 1	270
	21st to end	Day	36% 20% 35% 8% 1	225
March	1st to 10th	Day	28% 20% 37% 14% 1	270
	11th to 20th	Day	35% 21% 30% 12% 2	270
	21st to end	Day	33% 20% 31% 12% 3	372
April	1st to 10th	Day	23% 19% 33% 19% 6%	460
	11th to 20th	Day	27% 20% 30% 17% 7% 1	452
	21st to end	Day	26% 20% 30% 18% 5% 1	460
May	1st to 10th	Day	21% 20% 32% 19% 6% 1	463
	11th to 20th	Day	18% 13% 30% 23% 12% 3	656
	21st to end	Day	14% 10% 33% 26% 14% 4	734
June	1st to 10th	Day	10% 6% 25% 30% 23% 5%	680
	11th to 20th	Day	6% 4 23% 40% 22% 5%	680
	21st to end	Day	4 8% 29% 35% 19% 5%	680
July	1st to 10th	Day	11% 4 17% 29% 31% 9%	671
	11th to 20th	Day	4 4 21% 35% 29% 6%	668
	21st to end	Day	8% 3 16% 36% 28% 9%	739
August	1st to 10th	Day	8% 3 16% 40% 26% 7%	676
	11th to 20th	Day	17% 3 15% 31% 28% 6%	464
	21st to end	Day	14% 2 13% 30% 30% 12%	495
September	1st to 10th	Day	12% 4 17% 33% 25% 9%	450
	11th to 20th	Day	9% 4 17% 32% 26% 12%	450
	21st to end	Day	14% 7% 22% 30% 20% 7%	386
October	1st to 10th	Day	13% 10% 30% 33% 10% 4	270
	11th to 20th	Day	23% 16% 36% 18% 6% 1	270
	21st to end	Day	32% 18% 29% 18% 3	297
November	1st to 10th	Day	17% 16% 33% 27% 6% 2	270
	11th to 20th	Day	24% 17% 33% 16% 11%	270
	21st to end	Day	31% 16% 27% 18% 6% 2	270
December	1st to 10th	Day	21% 22% 31% 17% 6% 1	270
	11th to 20th	Day	27% 21% 30% 14% 7%	270
	21st to end	Day	29% 25% 32% 11% 3	297
January	1st to 10th	Night	23% 22% 33% 18% 3	950
	11th to 20th	Night	25% 21% 34% 15% 3	950
	21st to end	Night	21% 20% 37% 20% 2	1045
February	1st to 10th	Night	26% 17% 37% 19% 1	950
	11th to 20th	Night	23% 19% 39% 17% 2	781
	21st to end	Night	27% 20% 35% 17% 1	628
March	1st to 10th	Night	26% 14% 34% 23% 2	674
	11th to 20th	Night	25% 14% 34% 23% 5%	570
	21st to end	Night	26% 14% 35% 20% 5%	627
April	1st to 10th	Night	15% 18% 37% 25% 4	570
	11th to 20th	Night	19% 16% 30% 28% 7%	563
	21st to end	Night	21% 10% 40% 20% 7%	570
May	1st to 10th	Night	18% 8% 36% 29% 9%	570
	11th to 20th	Night	19% 6% 30% 28% 15% 2	561
	21st to end	Night	13% 6% 26% 35% 16% 4	617
June	1st to 10th	Night	9% 5% 18% 36% 30% 2	570
	11th to 20th	Night	6% 1 20% 46% 24% 2	570
	21st to end	Night	4 3 23% 39% 30% 2	570
July	1st to 10th	Night	10% 2 12% 33% 34% 9%	555
	11th to 20th	Night	4 1 13% 44% 32% 6%	552
	21st to end	Night	7% 2 12% 40% 33% 6%	624
August	1st to 10th	Night	7% 1 11% 40% 37% 4	567
	11th to 20th	Night	9% 1 13% 37% 37% 3	549
	21st to end	Night	8% 2 11% 31% 40% 7%	594
September	1st to 10th	Night	10% 3 14% 38% 31% 5%	540
	11th to 20th	Night	11% 2 14% 33% 35% 5%	540
	21st to end	Night	11% 5% 23% 28% 28% 4	688
October	1st to 10th	Night	10% 5% 26% 32% 24% 3	720
	11th to 20th	Night	17% 13% 30% 29% 11% 1	720
	21st to end	Night	26% 12% 28% 26% 8%	792
November	1st to 10th	Night	15% 11% 35% 29% 11%	740
	11th to 20th	Night	20% 13% 32% 28% 7% 1	760
	21st to end	Night	24% 14% 32% 23% 7%	826
December	1st to 10th	Night	24% 15% 33% 24% 5%	950
	11th to 20th	Night	26% 13% 31% 25% 5%	950
	21st to end	Night	29% 18% 31% 20% 3	1045

Page generated at 2024-08-12 08:52:49. Version ac07

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