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 2024-01-22.

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 5% 5% 3 5% 5% 5% 7% 42%	74783
	Night	13% 7% 3 5% 4 3 4 4 5% 7% 46%	75169
Transparency	Day	41% 4 11% 24% 16% 3	74496
	Night	39% 3 11% 25% 18% 3	74977
Seeing	Day	18% 12% 26% 25% 15% 4	14412
	Night	18% 11% 28% 27% 14% 2	24366

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	16% 9% 3 5% 4 2 4 4 4 5% 43%	1575
	11th to 20th	Day	17% 9% 3 7% 4 3 4 3 4 6% 39%	1710
	21st to end	Day	15% 9% 3 6% 5% 2 3 4 4 6% 44%	1791
February	1st to 10th	Day	18% 9% 4 7% 5% 4 5% 4 3 5% 37%	1620
	11th to 20th	Day	16% 8% 3 6% 4 3 4 4 5% 6% 39%	1709
	21st to end	Day	18% 10% 3 6% 5% 3 4 4 4 6% 37%	1480
March	1st to 10th	Day	16% 8% 4 6% 4 2 3 3 5% 6% 43%	1896
	11th to 20th	Day	20% 10% 2 5% 5% 3 4 4 4 6% 36%	1980
	21st to end	Day	20% 11% 4 6% 5% 3 5% 5% 5% 6% 30%	2249
April	1st to 10th	Day	12% 6% 3 6% 4 3 4 4 5% 8% 45%	2160
	11th to 20th	Day	17% 8% 3 6% 6% 3 4 4 4 6% 39%	2134
	21st to end	Day	20% 7% 3 6% 5% 3 4 4 5% 6% 36%	2160
May	1st to 10th	Day	17% 7% 3 5% 5% 2 5% 6% 6% 8% 35%	2160
	11th to 20th	Day	16% 5% 2 6% 6% 3 4 4 6% 7% 41%	2396
	21st to end	Day	11% 6% 3 5% 8% 4 6% 6% 7% 9% 34%	2725
June	1st to 10th	Day	8% 5% 3 6% 6% 4 6% 5% 6% 7% 44%	2520
	11th to 20th	Day	6% 3 2 5% 5% 4 5% 6% 7% 9% 49%	2520
	21st to end	Day	5% 3 2 4 6% 3 5% 7% 8% 10% 48%	2520
July	1st to 10th	Day	9% 5% 2 5% 6% 4 6% 5% 8% 10% 40%	2520
	11th to 20th	Day	4 3 2 5% 5% 4 5% 6% 7% 10% 47%	2431
	21st to end	Day	7% 4 3 7% 6% 4 6% 6% 7% 10% 40%	2546
August	1st to 10th	Day	8% 4 2 5% 6% 4 6% 6% 8% 11% 40%	2328
	11th to 20th	Day	11% 5% 2 5% 6% 4 6% 6% 7% 9% 38%	2133
	21st to end	Day	10% 5% 2 4 4 3 6% 6% 5% 9% 45%	2376
September	1st to 10th	Day	12% 5% 2 4 4 2 5% 5% 6% 8% 48%	2160
	11th to 20th	Day	10% 5% 2 5% 4 3 5% 5% 6% 7% 47%	2160
	21st to end	Day	9% 6% 2 4 4 2 4 4 4 6% 54%	1930
October	1st to 10th	Day	10% 5% 2 4 4 3 3 3 5% 6% 54%	1800
	11th to 20th	Day	15% 6% 3 4 3 2 3 3 4 4 53%	1800
	21st to end	Day	18% 8% 3 4 3 2 3 3 4 5% 46%	1980
November	1st to 10th	Day	13% 5% 2 4 3 2 3 4 5% 5% 54%	1744
	11th to 20th	Day	13% 7% 3 4 5% 2 3 4 5% 6% 48%	1710
	21st to end	Day	18% 9% 3 6% 4 2 3 3 3 5% 44%	1639
December	1st to 10th	Day	15% 8% 3 7% 5% 2 4 4 5% 6% 41%	1520
	11th to 20th	Day	15% 10% 4 8% 5% 3 5% 3 4 5% 39%	1918
	21st to end	Day	16% 17% 4 6% 5% 3 4 4 5% 5% 32%	2783
January	1st to 10th	Night	15% 9% 4 6% 4 2 4 4 4 5% 43%	2587
	11th to 20th	Night	16% 8% 3 6% 4 2 4 4 4 7% 41%	2470
	21st to end	Night	14% 9% 4 5% 4 3 4 4 5% 6% 41%	2600
February	1st to 10th	Night	17% 10% 4 5% 5% 3 3 3 5% 6% 40%	2340
	11th to 20th	Night	16% 7% 3 7% 4 2 3 3 4 7% 43%	2134
	21st to end	Night	19% 9% 3 5% 4 3 5% 3 4 5% 40%	1776
March	1st to 10th	Night	17% 8% 2 6% 4 2 3 3 5% 6% 44%	2079
	11th to 20th	Night	18% 9% 4 6% 5% 2 3 4 3 6% 38%	1980
	21st to end	Night	19% 11% 5% 6% 5% 3 3 4 4 6% 33%	2106
April	1st to 10th	Night	10% 5% 3 5% 4 3 4 4 5% 8% 51%	1800
	11th to 20th	Night	14% 6% 3 7% 5% 2 4 3 5% 7% 44%	1775
	21st to end	Night	19% 6% 3 5% 5% 3 4 3 5% 7% 41%	1800
May	1st to 10th	Night	15% 5% 2 4 4 2 5% 4 5% 7% 47%	1800
	11th to 20th	Night	16% 6% 2 5% 3 3 4 4 5% 7% 45%	1494
	21st to end	Night	10% 7% 3 7% 6% 4 5% 4 7% 10% 36%	1551
June	1st to 10th	Night	8% 3 2 6% 4 3 5% 5% 7% 8% 49%	1440
	11th to 20th	Night	6% 3 2 3 3 2 4 4 7% 10% 58%	1440
	21st to end	Night	3 2 2 3 4 2 4 5% 7% 12% 57%	1440
July	1st to 10th	Night	8% 3 2 5% 6% 3 4 5% 6% 9% 50%	1440
	11th to 20th	Night	4 3 2 3 4 2 3 4 7% 9% 58%	1523
	21st to end	Night	5% 3 2 5% 5% 3 5% 6% 7% 8% 50%	1772
August	1st to 10th	Night	5% 4 1 5% 5% 3 6% 6% 8% 9% 48%	1611
	11th to 20th	Night	6% 4 2 4 4 3 4 5% 6% 8% 54%	1767
	21st to end	Night	7% 4 2 4 4 2 4 5% 6% 8% 54%	1980
September	1st to 10th	Night	9% 5% 2 5% 4 2 4 4 4 7% 54%	1800
	11th to 20th	Night	9% 5% 2 4 4 3 4 4 5% 7% 54%	1800
	21st to end	Night	9% 5% 2 4 4 2 4 3 5% 6% 56%	2008
October	1st to 10th	Night	7% 5% 2 3 3 2 3 4 4 7% 61%	2160
	11th to 20th	Night	14% 6% 1 4 4 2 3 3 4 5% 54%	2160
	21st to end	Night	20% 7% 2 4 4 2 3 3 3 5% 48%	2376
November	1st to 10th	Night	11% 6% 2 3 3 2 3 3 4 5% 57%	2331
	11th to 20th	Night	14% 5% 2 4 4 2 4 4 5% 5% 49%	2470
	21st to end	Night	19% 8% 2 5% 4 2 2 3 4 5% 46%	2536
December	1st to 10th	Night	17% 9% 2 5% 5% 3 4 3 5% 8% 39%	2660
	11th to 20th	Night	17% 8% 3 6% 5% 3 4 3 4 6% 41%	3279
	21st to end	Night	19% 15% 5% 7% 5% 3 4 4 4 5% 28%	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	44% 2 9% 25% 16% 3	1576
	11th to 20th	Day	48% 3 10% 24% 14% 2	1710
	21st to end	Day	43% 2 13% 25% 13% 4	1791
February	1st to 10th	Day	51% 3 9% 23% 13% 1	1620
	11th to 20th	Day	45% 3 13% 21% 14% 4	1719
	21st to end	Day	49% 4 7% 23% 11% 6%	1480
March	1st to 10th	Day	43% 3 9% 23% 17% 5%	1896
	11th to 20th	Day	51% 3 9% 19% 14% 4	1980
	21st to end	Day	54% 3 12% 20% 10% 1	2249
April	1st to 10th	Day	38% 4 12% 26% 19% 2	2160
	11th to 20th	Day	48% 3 10% 20% 16% 3	2134
	21st to end	Day	49% 4 11% 20% 15% 1	2160
May	1st to 10th	Day	46% 6% 13% 22% 12% 1	2160
	11th to 20th	Day	43% 4 14% 23% 14% 2	2400
	21st to end	Day	45% 6% 13% 21% 12% 2	2725
June	1st to 10th	Day	39% 5% 13% 26% 16% 1	2520
	11th to 20th	Day	31% 6% 13% 29% 19% 3	2520
	21st to end	Day	28% 7% 18% 26% 16% 5%	2520
July	1st to 10th	Day	38% 6% 14% 26% 13% 4	2451
	11th to 20th	Day	30% 6% 14% 27% 18% 4	2356
	21st to end	Day	36% 7% 14% 30% 11% 1	2405
August	1st to 10th	Day	35% 7% 16% 27% 15% 1	2314
	11th to 20th	Day	40% 5% 13% 27% 13% 1	2133
	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	44% 2 9% 23% 19% 3	2587
	11th to 20th	Night	45% 2 11% 24% 16% 2	2470
	21st to end	Night	44% 3 10% 26% 16% 2	2600
February	1st to 10th	Night	47% 3 10% 24% 14% 2	2340
	11th to 20th	Night	42% 3 12% 22% 18% 3	2135
	21st to end	Night	48% 2 7% 23% 16% 5%	1776
March	1st to 10th	Night	43% 3 9% 21% 19% 6%	2079
	11th to 20th	Night	48% 5% 9% 21% 15% 3	1980
	21st to end	Night	52% 3 12% 20% 11% 1	2106
April	1st to 10th	Night	33% 4 13% 26% 21% 4	1800
	11th to 20th	Night	42% 3 10% 25% 15% 6%	1775
	21st to end	Night	44% 4 9% 26% 16% 1	1800
May	1st to 10th	Night	36% 5% 15% 25% 17% 2	1800
	11th to 20th	Night	40% 5% 14% 21% 18% 2	1495
	21st to end	Night	43% 6% 15% 20% 13% 3	1552
June	1st to 10th	Night	32% 4 17% 25% 20% 1	1440
	11th to 20th	Night	21% 4 14% 36% 20% 4	1440
	21st to end	Night	20% 6% 18% 31% 19% 7%	1440
July	1st to 10th	Night	32% 6% 16% 26% 16% 4	1400
	11th to 20th	Night	23% 5% 18% 29% 21% 5%	1475
	21st to end	Night	28% 7% 14% 35% 15% 1	1673
August	1st to 10th	Night	29% 6% 17% 33% 14% 2	1601
	11th to 20th	Night	28% 5% 15% 30% 19% 2	1767
	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	21% 33% 34% 11% 1	267
February	1st to 10th	Day	30% 25% 33% 10% 3	240
	11th to 20th	Day	36% 22% 31% 9% 1 1	240
	21st to end	Day	38% 20% 32% 8% 2 1	198
March	1st to 10th	Day	28% 21% 36% 13% 2	240
	11th to 20th	Day	38% 20% 28% 13% 2	240
	21st to end	Day	35% 19% 32% 12% 3	335
April	1st to 10th	Day	21% 19% 34% 20% 6%	420
	11th to 20th	Day	26% 18% 30% 17% 7% 1	412
	21st to end	Day	26% 18% 31% 18% 5% 1	420
May	1st to 10th	Day	21% 20% 32% 20% 7% 1	423
	11th to 20th	Day	18% 13% 31% 22% 12% 3	607
	21st to end	Day	13% 9% 33% 26% 15% 4	679
June	1st to 10th	Day	10% 6% 24% 31% 24% 6%	630
	11th to 20th	Day	6% 4 23% 40% 22% 5%	630
	21st to end	Day	4 7% 29% 35% 19% 5%	630
July	1st to 10th	Day	10% 3 14% 29% 33% 10%	621
	11th to 20th	Day	4 4 21% 35% 30% 6%	618
	21st to end	Day	8% 3 15% 37% 29% 9%	684
August	1st to 10th	Day	9% 3 14% 41% 27% 6%	626
	11th to 20th	Day	17% 2 15% 30% 29% 6%	447
	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	1000
February	1st to 10th	Night	26% 17% 37% 18% 1	900
	11th to 20th	Night	24% 19% 38% 18% 1	739
	21st to end	Night	29% 19% 33% 17% 2	592
March	1st to 10th	Night	26% 14% 34% 24% 2	639
	11th to 20th	Night	26% 14% 33% 22% 5%	540
	21st to end	Night	27% 14% 35% 20% 5%	594
April	1st to 10th	Night	14% 18% 38% 26% 4	540
	11th to 20th	Night	19% 16% 30% 28% 7%	533
	21st to end	Night	21% 10% 41% 20% 7%	540
May	1st to 10th	Night	18% 7% 36% 30% 9%	540
	11th to 20th	Night	19% 6% 30% 27% 15% 2	531
	21st to end	Night	13% 6% 25% 35% 17% 4	584
June	1st to 10th	Night	9% 5% 17% 36% 31% 2	540
	11th to 20th	Night	7% 1 20% 45% 24% 2	540
	21st to end	Night	4 2 23% 38% 31% 2	540
July	1st to 10th	Night	10% 2 11% 33% 35% 10%	525
	11th to 20th	Night	4 1 12% 44% 33% 6%	522
	21st to end	Night	6% 2 12% 40% 34% 7%	591
August	1st to 10th	Night	7% 1 10% 41% 38% 4	537
	11th to 20th	Night	8% 1 13% 37% 38% 3	534
	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 2024-01-19 08:28:35. Version ac07

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