Lincoln City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lincoln City clear sky chart from 2005-11-06 to 2026-04-17.

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	23% 10% 3 6% 4 4 4 3 5% 7% 32%	141481
	Night	27% 13% 3 7% 4 3 3 3 4 5% 29%	138039
Transparency	Day	50% 8% 12% 16% 11% 4	136241
	Night	55% 7% 10% 13% 10% 4	134279
Seeing	Day	26% 10% 21% 27% 13% 2	16954
	Night	32% 8% 15% 24% 18% 3	25544

By Month

Percentage Cloud Cover SW (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	44% 16% 4 8% 4 3 3 2 2 3 10%	4722
	11th to 20th	Day	25% 8% 2 4 3 3 2 2 4 5% 43%	4875
	21st to end	Day	33% 10% 3 6% 4 3 3 2 3 4 28%	5843
February	1st to 10th	Day	36% 16% 3 6% 5% 3 3 3 4 5% 17%	1890
	11th to 20th	Day	33% 15% 4 8% 5% 4 4 3 4 4 19%	1845
	21st to end	Day	35% 17% 4 6% 4 3 3 3 3 5% 17%	1585
March	1st to 10th	Day	23% 20% 4 7% 5% 4 5% 4 6% 5% 17%	5014
	11th to 20th	Day	34% 14% 4 7% 4 3 3 2 3 4 23%	5110
	21st to end	Day	35% 16% 3 9% 6% 4 4 3 5% 4 11%	5607
April	1st to 10th	Day	32% 14% 3 8% 5% 4 3 4 6% 7% 15%	2513
	11th to 20th	Day	28% 13% 3 8% 4 4 3 3 5% 6% 23%	2499
	21st to end	Day	27% 12% 4 6% 4 4 5% 5% 5% 6% 21%	2600
May	1st to 10th	Day	21% 11% 3 5% 3 3 3 2 5% 6% 37%	6029
	11th to 20th	Day	20% 12% 3 7% 4 4 5% 5% 6% 10% 23%	6277
	21st to end	Day	22% 10% 2 7% 4 4 4 3 6% 8% 28%	6902
June	1st to 10th	Day	26% 11% 3 7% 4 4 4 3 5% 6% 29%	2800
	11th to 20th	Day	22% 10% 3 7% 5% 4 4 4 6% 8% 25%	2908
	21st to end	Day	15% 8% 2 7% 4 4 4 4 5% 8% 39%	3000
July	1st to 10th	Day	5% 5% 2 4 3 3 3 3 5% 8% 59%	6688
	11th to 20th	Day	6% 5% 1 4 3 2 3 3 5% 9% 59%	6320
	21st to end	Day	6% 5% 2 5% 4 3 4 4 6% 10% 52%	6674
August	1st to 10th	Day	7% 8% 3 6% 4 4 3 3 6% 9% 47%	5777
	11th to 20th	Day	12% 7% 3 6% 4 5% 5% 5% 7% 8% 38%	5796
	21st to end	Day	8% 7% 3 7% 4 4 4 4 6% 9% 45%	6258
September	1st to 10th	Day	9% 6% 2 5% 3 3 5% 3 5% 10% 51%	2400
	11th to 20th	Day	14% 8% 2 5% 5% 4 4 4 6% 9% 39%	2319
	21st to end	Day	21% 7% 2 5% 4 3 3 3 4 7% 42%	2153
October	1st to 10th	Day	19% 6% 2 4 3 3 3 2 4 6% 49%	3280
	11th to 20th	Day	29% 10% 3 6% 4 5% 3 3 4 6% 27%	3261
	21st to end	Day	35% 8% 2 5% 3 4 4 4 6% 6% 24%	3558
November	1st to 10th	Day	36% 11% 3 7% 4 4 3 4 4 5% 18%	1718
	11th to 20th	Day	39% 10% 3 6% 4 3 3 3 5% 4 20%	1680
	21st to end	Day	32% 13% 3 7% 5% 4 4 3 4 4 23%	1680
December	1st to 10th	Day	27% 8% 2 6% 4 3 3 3 4 4 36%	2700
	11th to 20th	Day	42% 13% 3 8% 5% 4 4 3 4 4 12%	3108
	21st to end	Day	46% 14% 4 8% 4 3 3 2 3 3 11%	4092
January	1st to 10th	Night	42% 16% 3 7% 5% 4 3 2 3 4 11%	8172
	11th to 20th	Night	24% 10% 2 5% 3 3 2 2 3 4 42%	8089
	21st to end	Night	34% 11% 3 6% 3 2 2 2 3 3 30%	8371
February	1st to 10th	Night	34% 16% 4 7% 5% 3 4 3 4 4 17%	2730
	11th to 20th	Night	32% 16% 3 8% 3 4 3 2 3 4 22%	2662
	21st to end	Night	35% 15% 3 7% 4 3 2 3 4 3 21%	2219
March	1st to 10th	Night	26% 20% 3 8% 5% 5% 5% 3 4 5% 17%	5096
	11th to 20th	Night	32% 16% 3 8% 4 3 3 2 2 3 24%	5110
	21st to end	Night	38% 18% 3 8% 4 3 3 3 4 4 12%	5610
April	1st to 10th	Night	32% 15% 3 9% 4 4 3 2 4 4 19%	2105
	11th to 20th	Night	26% 16% 3 6% 5% 3 4 3 5% 7% 22%	1976
	21st to end	Night	28% 14% 3 7% 4 4 4 3 6% 5% 23%	1800
May	1st to 10th	Night	22% 12% 3 5% 3 2 2 3 4 6% 38%	3944
	11th to 20th	Night	26% 17% 4 8% 4 3 4 4 4 5% 21%	3616
	21st to end	Night	24% 14% 2 5% 3 3 4 3 5% 7% 30%	3972
June	1st to 10th	Night	23% 11% 3 8% 6% 3 3 3 5% 6% 30%	1600
	11th to 20th	Night	21% 11% 4 7% 5% 5% 4 4 5% 7% 27%	1485
	21st to end	Night	16% 13% 3 6% 4 4 3 2 5% 6% 38%	1400
July	1st to 10th	Night	5% 11% 3 7% 2 2 3 3 4 6% 54%	3264
	11th to 20th	Night	7% 8% 2 7% 3 3 3 3 4 6% 54%	3640
	21st to end	Night	7% 10% 4 11% 4 3 3 3 5% 7% 42%	4169
August	1st to 10th	Night	10% 13% 3 8% 3 3 4 4 5% 8% 40%	4035
	11th to 20th	Night	18% 11% 3 7% 4 3 3 3 5% 6% 38%	4052
	21st to end	Night	11% 12% 3 6% 3 3 3 3 4 6% 46%	4729
September	1st to 10th	Night	12% 8% 2 5% 3 2 2 3 5% 6% 52%	2000
	11th to 20th	Night	16% 8% 3 8% 4 3 3 3 4 5% 43%	2078
	21st to end	Night	17% 8% 2 5% 3 3 3 3 5% 6% 45%	2246
October	1st to 10th	Night	17% 6% 2 5% 3 3 2 3 4 5% 50%	3920
	11th to 20th	Night	26% 13% 2 6% 4 3 4 3 5% 6% 27%	3897
	21st to end	Night	33% 9% 2 7% 4 3 4 3 4 5% 25%	4253
November	1st to 10th	Night	36% 9% 3 7% 4 4 4 3 4 5% 19%	2797
	11th to 20th	Night	42% 9% 3 6% 4 3 3 2 4 4 20%	2940
	21st to end	Night	30% 11% 3 7% 4 5% 4 3 3 4 25%	2940
December	1st to 10th	Night	27% 9% 2 5% 3 3 3 2 4 5% 37%	4700
	11th to 20th	Night	46% 12% 3 8% 4 3 3 2 4 4 13%	5316
	21st to end	Night	44% 15% 3 7% 4 3 2 2 3 3 14%	7106

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	81% 5% 4 6% 4 1	4723
	11th to 20th	Day	45% 4 5% 16% 16% 14%	4875
	21st to end	Day	61% 5% 4 10% 15% 5%	5843
February	1st to 10th	Day	72% 6% 8% 8% 4 1	1890
	11th to 20th	Day	71% 8% 5% 9% 6% 2	1854
	21st to end	Day	71% 6% 6% 8% 7% 1	1585
March	1st to 10th	Day	65% 11% 12% 9% 4	5014
	11th to 20th	Day	66% 6% 7% 13% 8%	5110
	21st to end	Day	75% 9% 8% 4 2	5607
April	1st to 10th	Day	69% 10% 10% 9% 2	2513
	11th to 20th	Day	62% 9% 9% 12% 6% 2	2502
	21st to end	Day	63% 9% 9% 13% 5% 1	2600
May	1st to 10th	Day	46% 9% 13% 21% 11%	6029
	11th to 20th	Day	50% 13% 16% 14% 7%	6280
	21st to end	Day	49% 14% 21% 13% 2	6904
June	1st to 10th	Day	54% 8% 15% 15% 7%	2800
	11th to 20th	Day	54% 13% 15% 15% 4	2908
	21st to end	Day	40% 8% 20% 22% 8% 3	3000
July	1st to 10th	Day	18% 5% 12% 27% 18% 20%	6616
	11th to 20th	Day	16% 5% 10% 23% 35% 11%	6245
	21st to end	Day	18% 7% 21% 36% 16% 2	6480
August	1st to 10th	Day	26% 8% 13% 24% 19% 10%	4206
	11th to 20th	Day	36% 11% 20% 21% 9% 2	4195
	21st to end	Day	30% 7% 18% 22% 17% 5%	4513
September	1st to 10th	Day	28% 8% 15% 27% 14% 9%	2400
	11th to 20th	Day	39% 9% 16% 19% 12% 6%	2319
	21st to end	Day	42% 7% 12% 21% 13% 5%	2153
October	1st to 10th	Day	38% 4 7% 23% 25% 2	3280
	11th to 20th	Day	58% 6% 12% 15% 9% 1	3261
	21st to end	Day	61% 5% 9% 15% 8% 1	3558
November	1st to 10th	Day	70% 7% 6% 12% 4 1	1718
	11th to 20th	Day	69% 7% 7% 8% 6% 3	1680
	21st to end	Day	66% 6% 6% 9% 9% 4	1680
December	1st to 10th	Day	54% 4 8% 11% 21% 3	2700
	11th to 20th	Day	78% 5% 8% 6% 3	3108
	21st to end	Day	79% 6% 6% 6% 2 1	4092
January	1st to 10th	Night	78% 5% 6% 6% 3 2	8172
	11th to 20th	Night	48% 4 6% 13% 15% 14%	8089
	21st to end	Night	60% 3 4 7% 17% 8%	8371
February	1st to 10th	Night	71% 7% 7% 9% 4 2	2730
	11th to 20th	Night	67% 7% 8% 9% 6% 3	2664
	21st to end	Night	68% 6% 8% 9% 8% 2	2219
March	1st to 10th	Night	66% 8% 9% 12% 4	5096
	11th to 20th	Night	66% 7% 7% 11% 8% 1	5110
	21st to end	Night	74% 8% 8% 7% 2	5610
April	1st to 10th	Night	68% 7% 10% 10% 5%	2105
	11th to 20th	Night	61% 8% 10% 12% 6% 3	1976
	21st to end	Night	61% 8% 10% 13% 6% 2	1800
May	1st to 10th	Night	44% 9% 11% 24% 11% 1	3941
	11th to 20th	Night	54% 12% 15% 10% 6% 2	3616
	21st to end	Night	49% 12% 25% 12% 2	3972
June	1st to 10th	Night	51% 8% 14% 20% 5% 1	1600
	11th to 20th	Night	48% 11% 18% 17% 5%	1485
	21st to end	Night	40% 7% 20% 22% 7% 4	1400
July	1st to 10th	Night	22% 6% 13% 19% 18% 22%	3228
	11th to 20th	Night	17% 7% 10% 18% 32% 15%	3592
	21st to end	Night	20% 11% 20% 28% 15% 5%	4052
August	1st to 10th	Night	25% 10% 13% 24% 18% 10%	2929
	11th to 20th	Night	34% 9% 21% 22% 9% 4	2929
	21st to end	Night	32% 8% 14% 21% 18% 7%	3400
September	1st to 10th	Night	29% 7% 14% 25% 16% 10%	2000
	11th to 20th	Night	42% 7% 13% 19% 13% 7%	2078
	21st to end	Night	38% 7% 13% 19% 15% 8%	2246
October	1st to 10th	Night	35% 6% 8% 25% 23% 3	3920
	11th to 20th	Night	54% 9% 12% 13% 10% 2	3897
	21st to end	Night	62% 5% 8% 15% 8% 2	4253
November	1st to 10th	Night	67% 8% 8% 11% 6% 1	2797
	11th to 20th	Night	69% 6% 8% 7% 6% 3	2940
	21st to end	Night	62% 6% 8% 9% 9% 6%	2940
December	1st to 10th	Night	50% 5% 7% 15% 19% 4	4700
	11th to 20th	Night	77% 7% 6% 6% 4	5316
	21st to end	Night	76% 8% 7% 7% 2 1	7106

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	51% 15% 16% 11% 6%	220
	11th to 20th	Day	38% 12% 16% 20% 13% 1	264
	21st to end	Day	39% 12% 15% 20% 12% 1	473
February	1st to 10th	Day	46% 9% 17% 20% 7% 1	430
	11th to 20th	Day	42% 13% 24% 15% 7%	425
	21st to end	Day	40% 15% 23% 16% 6%	371
March	1st to 10th	Day	38% 17% 19% 20% 6% 1	540
	11th to 20th	Day	40% 11% 19% 21% 8% 2	540
	21st to end	Day	39% 18% 21% 15% 6% 1	594
April	1st to 10th	Day	34% 13% 21% 21% 9% 1	540
	11th to 20th	Day	33% 15% 23% 20% 7% 2	517
	21st to end	Day	30% 14% 25% 23% 7% 2	500
May	1st to 10th	Day	24% 14% 23% 27% 10% 2	503
	11th to 20th	Day	33% 10% 20% 23% 11% 3	528
	21st to end	Day	21% 10% 23% 28% 14% 3	573
June	1st to 10th	Day	26% 6% 23% 28% 15% 2	530
	11th to 20th	Day	22% 10% 33% 27% 8% 1	638
	21st to end	Day	14% 4 26% 39% 15% 2	730
July	1st to 10th	Day	11% 4 24% 42% 17% 2	683
	11th to 20th	Day	10% 3 25% 41% 19% 2	524
	21st to end	Day	6% 4 18% 45% 23% 4	575
August	1st to 10th	Day	10% 2 19% 40% 21% 7%	527
	11th to 20th	Day	6% 4 15% 39% 29% 7%	517
	21st to end	Day	10% 5% 23% 38% 20% 3	583
September	1st to 10th	Day	10% 4 24% 37% 22% 4	530
	11th to 20th	Day	16% 7% 22% 33% 18% 4	530
	21st to end	Day	20% 10% 23% 29% 14% 3	530
October	1st to 10th	Day	24% 8% 23% 26% 17% 2	530
	11th to 20th	Day	29% 11% 16% 25% 15% 4	530
	21st to end	Day	37% 10% 23% 18% 10% 2	583
November	1st to 10th	Day	38% 14% 23% 14% 10% 1	274
	11th to 20th	Day	40% 11% 18% 16% 12% 2	220
	21st to end	Day	34% 12% 19% 23% 12%	220
December	1st to 10th	Day	40% 12% 16% 16% 13% 3	220
	11th to 20th	Day	52% 13% 15% 14% 6%	220
	21st to end	Day	42% 19% 16% 17% 5% 1	242
January	1st to 10th	Night	50% 11% 15% 15% 9% 1	840
	11th to 20th	Night	41% 9% 16% 20% 12% 2	840
	21st to end	Night	39% 8% 16% 22% 13% 2	924
February	1st to 10th	Night	40% 10% 17% 22% 9% 1	840
	11th to 20th	Night	38% 12% 17% 19% 13% 1	824
	21st to end	Night	44% 11% 16% 19% 10% 1	692
March	1st to 10th	Night	43% 10% 14% 21% 10% 2	840
	11th to 20th	Night	41% 10% 13% 22% 13% 1	840
	21st to end	Night	43% 10% 15% 19% 11% 2	924
April	1st to 10th	Night	38% 10% 15% 22% 15% 2	840
	11th to 20th	Night	34% 11% 17% 23% 13% 2	752
	21st to end	Night	34% 10% 13% 28% 14% 1	600
May	1st to 10th	Night	28% 9% 15% 30% 16% 2	535
	11th to 20th	Night	33% 4 14% 22% 25% 3	394
	21st to end	Night	28% 8% 13% 26% 22% 3	433
June	1st to 10th	Night	27% 3 16% 27% 25% 3	400
	11th to 20th	Night	22% 7% 18% 31% 20% 2	400
	21st to end	Night	21% 2 13% 35% 28% 2	400
July	1st to 10th	Night	13% 1 14% 35% 33% 4	390
	11th to 20th	Night	13% 2 14% 40% 27% 3	388
	21st to end	Night	9% 3 11% 32% 39% 7%	523
August	1st to 10th	Night	13% 3 10% 28% 37% 9%	597
	11th to 20th	Night	12% 2 10% 26% 41% 9%	594
	21st to end	Night	12% 4 16% 33% 31% 5%	750
September	1st to 10th	Night	13% 4 14% 29% 35% 6%	800
	11th to 20th	Night	17% 3 15% 26% 29% 10%	800
	21st to end	Night	19% 6% 12% 34% 25% 4	800
October	1st to 10th	Night	25% 4 17% 26% 22% 6%	800
	11th to 20th	Night	27% 7% 13% 27% 20% 7%	800
	21st to end	Night	33% 9% 18% 21% 16% 4	880
November	1st to 10th	Night	38% 10% 16% 24% 13%	820
	11th to 20th	Night	46% 8% 13% 21% 11% 1	840
	21st to end	Night	32% 10% 19% 23% 13% 2	840
December	1st to 10th	Night	35% 9% 19% 22% 14% 2	840
	11th to 20th	Night	47% 11% 15% 18% 9% 1	840
	21st to end	Night	49% 14% 16% 15% 6% 1	924

Page generated at 2026-04-13 23:44:26. Version ac07

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