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 2024-11-11.

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% 5% 5% 4 6% 7% 36%	101276
	Night	14% 10% 4 7% 4 4 4 3 5% 6% 37%	97959
Transparency	Day	44% 7% 12% 22% 14% 2	104859
	Night	45% 6% 11% 21% 15% 2	102504
Seeing	Day	16% 11% 30% 25% 14% 5%	15782
	Night	17% 10% 31% 29% 12% 1	25614

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	18% 7% 3 7% 5% 4 5% 4 6% 9% 33%	4082
	11th to 20th	Day	14% 6% 2 7% 4 4 4 4 6% 8% 41%	4169
	21st to end	Day	9% 6% 2 6% 4 4 5% 4 6% 9% 45%	4824
June	1st to 10th	Day	11% 5% 2 6% 4 5% 6% 4 6% 8% 44%	2660
	11th to 20th	Day	9% 5% 2 6% 4 5% 5% 4 6% 9% 46%	2660
	21st to end	Day	10% 6% 2 6% 5% 5% 6% 5% 7% 9% 38%	2660
July	1st to 10th	Day	12% 6% 3 7% 5% 6% 6% 5% 7% 9% 34%	4440
	11th to 20th	Day	7% 4 2 5% 4 5% 5% 4 7% 11% 46%	4440
	21st to end	Day	8% 7% 3 7% 5% 5% 5% 4 6% 8% 41%	4813
August	1st to 10th	Day	7% 5% 2 6% 4 5% 5% 4 6% 8% 47%	4234
	11th to 20th	Day	9% 5% 2 7% 4 5% 4 5% 6% 8% 45%	3798
	21st to end	Day	7% 4 2 5% 5% 5% 5% 4 6% 9% 49%	4180
September	1st to 10th	Day	10% 5% 2 5% 4 5% 4 3 6% 7% 48%	2280
	11th to 20th	Day	11% 5% 2 5% 3 4 4 3 6% 8% 50%	2125
	21st to end	Day	11% 6% 2 6% 4 4 5% 5% 6% 8% 43%	2090
October	1st to 10th	Day	12% 7% 3 6% 3 4 4 4 4 7% 46%	2090
	11th to 20th	Day	19% 8% 2 7% 4 4 4 4 5% 7% 37%	1866
	21st to end	Day	20% 9% 3 8% 4 5% 4 4 5% 6% 31%	1881
November	1st to 10th	Day	13% 7% 2 6% 4 4 4 4 5% 7% 44%	1762
	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% 8% 3 7% 5% 4 4 4 6% 9% 34%	2813
	11th to 20th	Night	16% 7% 2 5% 4 4 4 3 6% 8% 40%	2724
	21st to end	Night	10% 7% 2 7% 5% 5% 5% 3 5% 7% 43%	2743
June	1st to 10th	Night	9% 5% 2 6% 4 4 4 4 5% 9% 49%	1520
	11th to 20th	Night	7% 7% 2 6% 4 5% 4 4 6% 9% 46%	1520
	21st to end	Night	10% 6% 2 6% 6% 5% 5% 4 6% 7% 42%	1520
July	1st to 10th	Night	10% 5% 2 6% 5% 5% 5% 4 6% 8% 43%	2530
	11th to 20th	Night	7% 4 2 6% 4 4 3 3 6% 7% 55%	2530
	21st to end	Night	5% 6% 2 6% 5% 5% 5% 5% 7% 8% 46%	2750
August	1st to 10th	Night	7% 4 2 6% 4 4 5% 4 6% 9% 47%	2697
	11th to 20th	Night	7% 5% 2 5% 4 4 5% 4 5% 8% 52%	3028
	21st to end	Night	8% 5% 2 5% 4 3 4 4 5% 8% 52%	3476
September	1st to 10th	Night	10% 5% 2 5% 4 3 3 3 5% 6% 53%	1900
	11th to 20th	Night	8% 4 1 4 3 3 4 4 6% 8% 54%	2034
	21st to end	Night	10% 6% 3 6% 4 5% 4 4 5% 8% 46%	2090
October	1st to 10th	Night	11% 4 2 5% 4 4 3 3 5% 7% 52%	2090
	11th to 20th	Night	16% 7% 3 6% 3 4 3 3 4 6% 45%	2310
	21st to end	Night	20% 8% 2 7% 4 3 3 3 4 7% 38%	2717
November	1st to 10th	Night	14% 8% 3 5% 4 4 3 3 5% 7% 45%	2536
	11th to 20th	Night	14% 10% 3 9% 4 4 4 4 5% 7% 36%	2477
	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	46% 9% 12% 23% 9%	4120
	11th to 20th	Day	40% 7% 14% 28% 11% 1	4173
	21st to end	Day	33% 8% 13% 21% 22% 3	4837
June	1st to 10th	Day	35% 9% 12% 24% 18% 3	2660
	11th to 20th	Day	34% 7% 12% 24% 20% 3	2660
	21st to end	Day	40% 8% 15% 19% 15% 3	2660
July	1st to 10th	Day	44% 7% 12% 20% 14% 2	4371
	11th to 20th	Day	30% 7% 16% 28% 17% 1	4365
	21st to end	Day	39% 8% 15% 16% 19% 2	4662
August	1st to 10th	Day	34% 6% 15% 27% 16% 1	4219
	11th to 20th	Day	34% 7% 11% 30% 17% 1	3836
	21st to end	Day	31% 7% 13% 25% 20% 4	4179
September	1st to 10th	Day	34% 7% 13% 25% 17% 4	2280
	11th to 20th	Day	32% 6% 12% 25% 22% 4	2125
	21st to end	Day	37% 6% 11% 25% 19% 2	2090
October	1st to 10th	Day	26% 4 8% 32% 28% 2	3480
	11th to 20th	Day	36% 6% 12% 22% 24% 1	3069
	21st to end	Day	45% 4 10% 26% 14% 2	3081
November	1st to 10th	Day	38% 5% 15% 23% 16% 2	1762
	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% 11% 21% 12% 2	2840
	11th to 20th	Night	40% 9% 15% 25% 11%	2725
	21st to end	Night	38% 8% 11% 16% 22% 5%	2751
June	1st to 10th	Night	32% 7% 12% 26% 20% 3	1520
	11th to 20th	Night	33% 7% 11% 23% 23% 3	1520
	21st to end	Night	39% 8% 14% 21% 14% 3	1520
July	1st to 10th	Night	38% 6% 14% 24% 13% 5%	2490
	11th to 20th	Night	28% 6% 13% 25% 26% 2	2482
	21st to end	Night	33% 7% 17% 19% 19% 5%	2662
August	1st to 10th	Night	32% 9% 15% 28% 16% 1	2688
	11th to 20th	Night	30% 6% 13% 28% 20% 2	3056
	21st to end	Night	31% 6% 11% 31% 19% 3	3476
September	1st to 10th	Night	31% 7% 12% 24% 21% 5%	1900
	11th to 20th	Night	27% 6% 10% 27% 27% 4	2034
	21st to end	Night	37% 5% 10% 27% 18% 3	2090
October	1st to 10th	Night	22% 4 8% 34% 30% 2	3480
	11th to 20th	Night	35% 5% 8% 23% 28% 2	3833
	21st to end	Night	39% 4 9% 25% 21% 3	4467
November	1st to 10th	Night	40% 5% 10% 25% 18% 3	2536
	11th to 20th	Night	47% 6% 12% 21% 13% 2	2477
	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% 29% 27% 14% 7%	734
June	1st to 10th	Day	10% 9% 30% 30% 15% 5%	680
	11th to 20th	Day	12% 6% 33% 28% 17% 4	680
	21st to end	Day	12% 9% 33% 29% 12% 5%	680
July	1st to 10th	Day	8% 6% 23% 30% 19% 14%	671
	11th to 20th	Day	9% 5% 25% 31% 20% 10%	668
	21st to end	Day	8% 4 26% 33% 22% 7%	739
August	1st to 10th	Day	8% 4 18% 33% 26% 12%	565
	11th to 20th	Day	9% 4 22% 28% 25% 12%	479
	21st to end	Day	8% 3 17% 36% 26% 10%	539
September	1st to 10th	Day	11% 7% 21% 33% 20% 9%	490
	11th to 20th	Day	10% 5% 15% 29% 27% 13%	490
	21st to end	Day	13% 9% 24% 28% 17% 8%	490
October	1st to 10th	Day	13% 7% 30% 30% 16% 4	490
	11th to 20th	Day	18% 23% 27% 24% 9%	305
	21st to end	Day	31% 13% 36% 16% 4 1	330
November	1st to 10th	Day	15% 13% 37% 23% 9% 2	300
	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% 4 27% 38% 18% 1	617
June	1st to 10th	Night	10% 3 24% 46% 16%	570
	11th to 20th	Night	9% 3 32% 39% 15% 1	570
	21st to end	Night	11% 5% 28% 38% 17% 1	570
July	1st to 10th	Night	8% 2 18% 43% 25% 4	555
	11th to 20th	Night	7% 3 18% 40% 28% 4	552
	21st to end	Night	5% 2 16% 49% 27% 1	624
August	1st to 10th	Night	6% 2 12% 46% 30% 4	567
	11th to 20th	Night	6% 1 15% 43% 30% 4	564
	21st to end	Night	8% 3 17% 40% 30% 3	627
September	1st to 10th	Night	11% 4 18% 39% 24% 4	570
	11th to 20th	Night	7% 4 18% 38% 29% 3	704
	21st to end	Night	11% 7% 24% 33% 23% 3	760
October	1st to 10th	Night	12% 6% 26% 37% 17% 1	760
	11th to 20th	Night	19% 14% 30% 27% 9%	760
	21st to end	Night	24% 14% 32% 24% 7%	836
November	1st to 10th	Night	17% 12% 36% 25% 9% 1	780
	11th to 20th	Night	18% 17% 36% 24% 5%	763
	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 2024-11-08 05:44:47. Version ac07

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