Lemon Lake County Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lemon Lake County Park clear sky chart from 2005-11-06 to 2024-05-30.

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% 10% 4 8% 5% 5% 4 4 6% 7% 35%	83670
	Night	15% 10% 4 8% 4 4 4 3 5% 6% 36%	86260
Transparency	Day	47% 7% 12% 20% 12% 2	83371
	Night	48% 6% 11% 20% 13% 2	86080
Seeing	Day	16% 11% 30% 25% 13% 5%	15087
	Night	18% 10% 31% 29% 12% 1	25057

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	15% 13% 10% 11% 6% 5% 6% 4 6% 5% 20%	2527
	11th to 20th	Day	15% 15% 7% 15% 6% 5% 4 7% 7% 4 16%	2530
	21st to end	Day	22% 25% 6% 10% 3 3 3 3 3 5% 17%	2819
February	1st to 10th	Day	17% 14% 5% 9% 6% 6% 3 3 5% 6% 26%	1809
	11th to 20th	Day	14% 12% 4 9% 5% 5% 4 3 5% 7% 33%	1848
	21st to end	Day	16% 14% 6% 10% 5% 3 4 4 5% 6% 27%	1570
March	1st to 10th	Day	18% 14% 4 7% 5% 4 3 3 4 5% 32%	3120
	11th to 20th	Day	10% 7% 4 7% 6% 5% 5% 4 7% 7% 38%	3255
	21st to end	Day	19% 11% 6% 11% 6% 5% 5% 4 5% 6% 22%	4151
April	1st to 10th	Day	17% 13% 3 7% 5% 4 4 4 5% 7% 32%	2280
	11th to 20th	Day	16% 10% 2 7% 5% 4 4 4 5% 7% 37%	2254
	21st to end	Day	20% 8% 3 7% 4 5% 4 4 6% 6% 33%	2408
May	1st to 10th	Day	17% 9% 3 7% 5% 5% 5% 4 6% 8% 31%	2470
	11th to 20th	Day	17% 7% 3 8% 4 4 4 4 5% 7% 36%	2480
	21st to end	Day	12% 6% 3 6% 5% 5% 5% 5% 6% 8% 40%	2852
June	1st to 10th	Day	10% 5% 2 6% 4 5% 6% 4 6% 9% 44%	2520
	11th to 20th	Day	9% 5% 2 7% 4 5% 5% 4 6% 9% 45%	2520
	21st to end	Day	10% 6% 2 6% 5% 5% 6% 5% 7% 9% 38%	2520
July	1st to 10th	Day	7% 5% 3 6% 4 5% 6% 5% 7% 9% 44%	2520
	11th to 20th	Day	9% 4 2 5% 5% 5% 5% 4 7% 9% 45%	2520
	21st to end	Day	6% 6% 2 6% 5% 6% 5% 4 8% 9% 44%	2743
August	1st to 10th	Day	7% 5% 2 6% 4 5% 5% 5% 6% 9% 46%	2402
	11th to 20th	Day	8% 5% 2 7% 5% 5% 5% 5% 6% 8% 44%	2168
	21st to end	Day	8% 5% 2 5% 4 5% 5% 4 6% 10% 48%	2376
September	1st to 10th	Day	11% 5% 2 5% 4 5% 4 4 7% 7% 46%	2160
	11th to 20th	Day	11% 5% 2 5% 3 4 4 3 6% 8% 48%	2014
	21st to end	Day	10% 5% 2 6% 4 4 5% 5% 6% 9% 44%	1980
October	1st to 10th	Day	12% 7% 3 6% 4 4 4 4 4 7% 44%	1980
	11th to 20th	Day	19% 8% 2 7% 4 3 4 4 5% 7% 35%	1769
	21st to end	Day	21% 9% 3 8% 4 5% 4 4 5% 6% 31%	1782
November	1st to 10th	Day	12% 7% 2 5% 4 4 4 4 5% 8% 45%	1672
	11th to 20th	Day	18% 9% 3 9% 4 4 4 3 5% 7% 35%	1710
	21st to end	Day	18% 12% 2 8% 5% 4 3 3 4 5% 35%	1710
December	1st to 10th	Day	15% 15% 5% 9% 6% 5% 4 3 5% 5% 28%	1530
	11th to 20th	Day	13% 14% 5% 12% 5% 4 5% 3 5% 6% 27%	1918
	21st to end	Day	22% 23% 7% 13% 5% 3 4 3 4 3 13%	2783
January	1st to 10th	Night	16% 16% 8% 11% 6% 4 4 3 4 4 25%	4428
	11th to 20th	Night	15% 19% 8% 13% 5% 4 5% 5% 6% 3 17%	4440
	21st to end	Night	24% 18% 7% 9% 4 4 3 2 4 3 21%	4845
February	1st to 10th	Night	17% 14% 4 8% 5% 4 4 3 4 6% 30%	2369
	11th to 20th	Night	14% 11% 4 7% 4 4 4 3 4 7% 36%	2218
	21st to end	Night	19% 13% 4 8% 4 3 3 3 5% 5% 32%	1884
March	1st to 10th	Night	17% 11% 4 7% 4 3 3 3 4 6% 37%	3733
	11th to 20th	Night	11% 7% 2 6% 4 5% 4 3 5% 6% 47%	3704
	21st to end	Night	19% 10% 7% 9% 5% 5% 4 4 6% 5% 28%	3508
April	1st to 10th	Night	15% 9% 2 7% 5% 4 5% 3 6% 7% 38%	1900
	11th to 20th	Night	17% 9% 3 7% 4 4 4 3 4 6% 39%	1875
	21st to end	Night	17% 7% 3 8% 5% 5% 4 3 5% 6% 36%	1772
May	1st to 10th	Night	17% 7% 3 6% 5% 5% 5% 4 6% 8% 35%	1710
	11th to 20th	Night	16% 8% 3 6% 4 4 5% 4 6% 7% 39%	1630
	21st to end	Night	9% 6% 2 7% 6% 6% 6% 4 6% 9% 40%	1623
June	1st to 10th	Night	9% 4 2 6% 4 3 4 4 5% 9% 49%	1440
	11th to 20th	Night	7% 7% 2 6% 5% 5% 4 4 6% 10% 46%	1440
	21st to end	Night	10% 6% 2 6% 6% 5% 5% 5% 5% 7% 42%	1440
July	1st to 10th	Night	6% 5% 2 5% 5% 3 4 4 6% 8% 52%	1440
	11th to 20th	Night	8% 3 2 5% 3 4 3 3 6% 7% 55%	1440
	21st to end	Night	4 4 1 4 4 5% 5% 5% 7% 8% 53%	1575
August	1st to 10th	Night	7% 3 1 5% 4 4 5% 4 7% 10% 50%	1534
	11th to 20th	Night	6% 5% 2 5% 4 4 5% 4 5% 9% 51%	1730
	21st to end	Night	8% 5% 2 5% 4 3 4 3 5% 8% 53%	1980
September	1st to 10th	Night	10% 6% 3 5% 4 3 3 3 5% 6% 51%	1800
	11th to 20th	Night	9% 4 2 5% 4 3 4 4 6% 7% 54%	1926
	21st to end	Night	9% 6% 2 6% 4 5% 4 4 5% 8% 47%	1980
October	1st to 10th	Night	12% 5% 2 5% 4 4 3 3 5% 7% 50%	1980
	11th to 20th	Night	17% 7% 3 6% 3 4 3 3 4 6% 44%	2188
	21st to end	Night	21% 9% 3 7% 4 3 3 3 4 7% 37%	2574
November	1st to 10th	Night	13% 8% 3 5% 4 4 3 3 5% 7% 45%	2406
	11th to 20th	Night	14% 10% 3 9% 4 4 4 4 5% 7% 36%	2470
	21st to end	Night	18% 11% 3 7% 5% 4 4 3 4 5% 37%	2470
December	1st to 10th	Night	17% 13% 4 9% 4 4 4 3 5% 7% 31%	2645
	11th to 20th	Night	16% 14% 4 9% 5% 4 4 4 4 5% 31%	3279
	21st to end	Night	24% 19% 6% 11% 5% 4 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	62% 9% 11% 11% 6%	2528
	11th to 20th	Day	68% 5% 9% 11% 8%	2530
	21st to end	Day	72% 4 8% 12% 4	2819
February	1st to 10th	Day	60% 3 13% 15% 8% 2	1809
	11th to 20th	Day	51% 5% 10% 22% 10% 1	1858
	21st to end	Day	56% 7% 10% 19% 6% 2	1570
March	1st to 10th	Day	54% 6% 10% 19% 9% 2	3120
	11th to 20th	Day	42% 7% 12% 27% 11% 1	3255
	21st to end	Day	60% 9% 14% 13% 3	4151
April	1st to 10th	Day	52% 5% 11% 20% 12%	2280
	11th to 20th	Day	47% 6% 11% 22% 12% 3	2254
	21st to end	Day	50% 6% 14% 17% 11% 2	2408
May	1st to 10th	Day	49% 8% 12% 23% 8%	2470
	11th to 20th	Day	47% 7% 13% 21% 12% 1	2484
	21st to end	Day	40% 8% 13% 21% 17% 2	2852
June	1st to 10th	Day	34% 9% 12% 24% 18% 2	2520
	11th to 20th	Day	34% 7% 12% 23% 20% 3	2520
	21st to end	Day	40% 8% 16% 19% 15% 2	2520
July	1st to 10th	Day	34% 8% 13% 24% 17% 4	2451
	11th to 20th	Day	33% 8% 15% 26% 15% 2	2445
	21st to end	Day	34% 9% 16% 23% 16% 3	2591
August	1st to 10th	Day	33% 7% 17% 27% 14% 2	2387
	11th to 20th	Day	35% 7% 15% 25% 17% 1	2168
	21st to end	Day	31% 7% 14% 25% 18% 5%	2376
September	1st to 10th	Day	36% 7% 13% 24% 15% 4	2160
	11th to 20th	Day	33% 7% 12% 25% 19% 4	2014
	21st to end	Day	35% 6% 12% 26% 20% 2	1980
October	1st to 10th	Day	39% 6% 12% 24% 17% 2	1980
	11th to 20th	Day	46% 6% 11% 21% 14% 1	1769
	21st to end	Day	53% 5% 12% 20% 9% 1	1782
November	1st to 10th	Day	38% 6% 16% 23% 16% 2	1672
	11th to 20th	Day	49% 5% 12% 21% 11% 1	1710
	21st to end	Day	52% 6% 10% 21% 10%	1710
December	1st to 10th	Day	58% 5% 12% 17% 7%	1530
	11th to 20th	Day	58% 6% 11% 19% 6%	1915
	21st to end	Day	76% 5% 8% 8% 3	2783
January	1st to 10th	Night	62% 7% 10% 14% 6% 1	4428
	11th to 20th	Night	70% 4 11% 10% 5%	4440
	21st to end	Night	68% 4 9% 14% 5%	4845
February	1st to 10th	Night	57% 4 11% 17% 10% 2	2369
	11th to 20th	Night	49% 5% 12% 20% 13% 2	2219
	21st to end	Night	53% 5% 10% 18% 10% 3	1884
March	1st to 10th	Night	49% 5% 12% 23% 9% 2	3733
	11th to 20th	Night	37% 6% 12% 26% 18% 2	3704
	21st to end	Night	56% 8% 11% 19% 6%	3508
April	1st to 10th	Night	45% 5% 12% 22% 14% 1	1900
	11th to 20th	Night	46% 6% 8% 20% 16% 4	1875
	21st to end	Night	47% 7% 10% 20% 14% 3	1772
May	1st to 10th	Night	47% 7% 12% 22% 12% 1	1710
	11th to 20th	Night	42% 9% 12% 21% 15% 1	1631
	21st to end	Night	39% 8% 14% 18% 17% 4	1624
June	1st to 10th	Night	32% 7% 12% 26% 21% 3	1440
	11th to 20th	Night	33% 7% 11% 23% 23% 3	1440
	21st to end	Night	39% 9% 14% 22% 14% 3	1440
July	1st to 10th	Night	30% 7% 15% 27% 17% 4	1400
	11th to 20th	Night	28% 6% 14% 26% 23% 3	1392
	21st to end	Night	25% 7% 19% 26% 17% 5%	1487
August	1st to 10th	Night	28% 9% 15% 30% 17% 1	1525
	11th to 20th	Night	29% 7% 16% 25% 20% 2	1730
	21st to end	Night	29% 7% 11% 27% 21% 5%	1980
September	1st to 10th	Night	32% 7% 12% 24% 19% 6%	1800
	11th to 20th	Night	28% 6% 10% 27% 25% 4	1926
	21st to end	Night	36% 5% 11% 27% 19% 3	1980
October	1st to 10th	Night	36% 6% 10% 25% 22% 2	1980
	11th to 20th	Night	41% 6% 10% 24% 19% 2	2188
	21st to end	Night	49% 4 11% 21% 13% 2	2574
November	1st to 10th	Night	39% 5% 10% 25% 18% 3	2406
	11th to 20th	Night	47% 6% 12% 21% 13% 2	2470
	21st to end	Night	50% 5% 11% 24% 11%	2470
December	1st to 10th	Night	53% 6% 11% 20% 9% 1	2645
	11th to 20th	Night	55% 5% 13% 17% 10% 1	3281
	21st to end	Night	72% 5% 10% 10% 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	21% 14% 34% 24% 6% 1	270
	11th to 20th	Day	24% 16% 39% 16% 5% 1	270
	21st to end	Day	21% 20% 33% 20% 6%	297
February	1st to 10th	Day	23% 19% 37% 17% 4	270
	11th to 20th	Day	25% 15% 37% 18% 4 1	270
	21st to end	Day	22% 21% 43% 11% 3	225
March	1st to 10th	Day	23% 21% 37% 17% 2	270
	11th to 20th	Day	22% 17% 36% 19% 7%	326
	21st to end	Day	27% 19% 28% 19% 6%	506
April	1st to 10th	Day	22% 15% 33% 21% 7% 1	460
	11th to 20th	Day	22% 18% 31% 16% 12% 2	452
	21st to end	Day	25% 13% 37% 15% 8% 2	460
May	1st to 10th	Day	22% 14% 32% 20% 10% 2	463
	11th to 20th	Day	20% 9% 32% 21% 15% 3	536
	21st to end	Day	13% 10% 30% 26% 14% 7%	725
June	1st to 10th	Day	10% 8% 30% 30% 16% 6%	630
	11th to 20th	Day	13% 6% 32% 28% 18% 4	630
	21st to end	Day	12% 8% 32% 30% 12% 5%	630
July	1st to 10th	Day	8% 5% 22% 30% 20% 15%	621
	11th to 20th	Day	10% 6% 24% 31% 20% 10%	618
	21st to end	Day	8% 4 27% 32% 22% 7%	684
August	1st to 10th	Day	7% 3 17% 32% 27% 13%	521
	11th to 20th	Day	8% 5% 21% 28% 26% 13%	439
	21st to end	Day	8% 3 18% 35% 25% 11%	495
September	1st to 10th	Day	12% 6% 20% 33% 20% 9%	450
	11th to 20th	Day	11% 6% 16% 28% 26% 13%	450
	21st to end	Day	11% 9% 25% 28% 18% 8%	450
October	1st to 10th	Day	14% 7% 30% 29% 16% 4	450
	11th to 20th	Day	19% 24% 27% 24% 6%	275
	21st to end	Day	33% 12% 36% 15% 3 1	297
November	1st to 10th	Day	14% 13% 38% 22% 10% 3	270
	11th to 20th	Day	22% 16% 37% 16% 8% 1	270
	21st to end	Day	25% 12% 37% 21% 4	270
December	1st to 10th	Day	19% 20% 37% 17% 7%	270
	11th to 20th	Day	19% 21% 37% 17% 6%	270
	21st to end	Day	26% 21% 36% 15% 2	297
January	1st to 10th	Night	21% 16% 36% 23% 4	950
	11th to 20th	Night	22% 16% 38% 20% 4 1	950
	21st to end	Night	22% 14% 36% 24% 4	1045
February	1st to 10th	Night	24% 11% 40% 22% 3	849
	11th to 20th	Night	20% 15% 36% 26% 3	743
	21st to end	Night	25% 15% 38% 20% 3	628
March	1st to 10th	Night	22% 14% 36% 23% 5%	760
	11th to 20th	Night	17% 12% 40% 24% 6%	760
	21st to end	Night	23% 12% 35% 22% 7%	656
April	1st to 10th	Night	18% 14% 39% 23% 6% 1	570
	11th to 20th	Night	20% 12% 36% 24% 7% 1	563
	21st to end	Night	22% 9% 35% 27% 7% 1	570
May	1st to 10th	Night	19% 7% 36% 27% 10% 1	570
	11th to 20th	Night	19% 4 28% 35% 14% 1	561
	21st to end	Night	12% 3 27% 38% 18% 1	611
June	1st to 10th	Night	10% 3 23% 47% 16%	540
	11th to 20th	Night	10% 3 31% 39% 15% 1	540
	21st to end	Night	10% 5% 27% 38% 18% 1	540
July	1st to 10th	Night	7% 2 17% 43% 26% 4	525
	11th to 20th	Night	7% 3 18% 41% 28% 4	522
	21st to end	Night	5% 2 17% 48% 27% 1	591
August	1st to 10th	Night	6% 2 11% 47% 30% 4	537
	11th to 20th	Night	7% 1 14% 43% 31% 5%	534
	21st to end	Night	8% 2 18% 39% 30% 3	594
September	1st to 10th	Night	12% 4 18% 37% 24% 4	540
	11th to 20th	Night	8% 4 19% 38% 28% 4	666
	21st to end	Night	10% 7% 24% 32% 24% 3	720
October	1st to 10th	Night	13% 6% 27% 35% 18% 2	720
	11th to 20th	Night	20% 14% 31% 26% 8%	720
	21st to end	Night	25% 14% 31% 23% 6%	792
November	1st to 10th	Night	17% 11% 37% 24% 10% 1	740
	11th to 20th	Night	18% 17% 36% 24% 5%	760
	21st to end	Night	22% 14% 34% 24% 6%	760
December	1st to 10th	Night	23% 14% 37% 21% 4	935
	11th to 20th	Night	23% 11% 37% 24% 4	950
	21st to end	Night	28% 15% 34% 21% 2	1045

Page generated at 2024-05-26 23:31:46. Version ac07

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