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 2024-12-24.

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% 11% 3 6% 4 4 4 3 5% 7% 31%	106371
	Night	27% 13% 3 7% 4 3 3 3 4 5% 28%	102434
Transparency	Day	50% 9% 12% 15% 10% 4	106115
	Night	55% 8% 10% 13% 9% 4	102279
Seeing	Day	26% 9% 21% 28% 14% 2	15297
	Night	32% 8% 15% 24% 19% 3	23842

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	43% 20% 5% 6% 3 2 2 2 3 4 10%	2539
	11th to 20th	Day	44% 10% 3 5% 3 3 2 2 3 3 21%	2605
	21st to end	Day	44% 13% 3 7% 4 3 3 2 3 4 14%	3146
February	1st to 10th	Day	38% 15% 3 6% 5% 2 3 3 4 5% 17%	1710
	11th to 20th	Day	33% 15% 4 8% 5% 4 4 3 4 3 19%	1665
	21st to end	Day	35% 17% 4 6% 4 3 3 3 3 5% 17%	1438
March	1st to 10th	Day	24% 22% 4 6% 5% 3 4 4 5% 5% 18%	3408
	11th to 20th	Day	28% 12% 4 7% 4 3 3 2 3 4 32%	3490
	21st to end	Day	33% 18% 3 8% 5% 4 3 3 4 4 14%	3825
April	1st to 10th	Day	33% 15% 4 8% 5% 4 3 4 5% 6% 14%	2273
	11th to 20th	Day	30% 13% 3 9% 4 4 3 3 5% 6% 21%	2303
	21st to end	Day	28% 12% 3 7% 4 4 5% 5% 5% 6% 20%	2470
May	1st to 10th	Day	24% 12% 3 6% 3 3 4 2 5% 5% 32%	4220
	11th to 20th	Day	15% 10% 2 6% 4 4 4 5% 7% 11% 32%	4377
	21st to end	Day	26% 11% 3 8% 5% 5% 5% 4 6% 7% 21%	4813
June	1st to 10th	Day	27% 11% 3 7% 4 4 4 3 5% 5% 27%	2660
	11th to 20th	Day	23% 10% 3 7% 5% 4 4 4 6% 8% 24%	2762
	21st to end	Day	14% 8% 2 7% 4 4 4 4 5% 8% 40%	2850
July	1st to 10th	Day	5% 5% 2 3 2 3 3 3 5% 8% 60%	4677
	11th to 20th	Day	7% 7% 1 5% 3 2 2 3 5% 10% 55%	4420
	21st to end	Day	8% 6% 2 5% 4 3 3 4 6% 10% 50%	4649
August	1st to 10th	Day	6% 10% 2 6% 4 4 4 3 6% 10% 46%	4091
	11th to 20th	Day	11% 8% 2 6% 4 5% 5% 5% 7% 9% 39%	4026
	21st to end	Day	8% 6% 2 6% 3 3 3 3 6% 9% 49%	4376
September	1st to 10th	Day	9% 6% 2 5% 3 3 4 3 5% 10% 51%	2280
	11th to 20th	Day	14% 8% 2 5% 5% 4 4 4 6% 9% 39%	2203
	21st to end	Day	21% 7% 2 5% 4 3 4 3 5% 7% 41%	2046
October	1st to 10th	Day	20% 5% 2 4 2 3 3 2 4 6% 49%	3180
	11th to 20th	Day	29% 10% 3 6% 4 5% 3 3 4 6% 26%	3161
	21st to end	Day	35% 8% 2 5% 3 4 4 4 6% 6% 24%	3448
November	1st to 10th	Day	36% 11% 3 7% 5% 4 4 4 4 4 18%	1634
	11th to 20th	Day	38% 10% 3 6% 4 3 3 3 5% 4 20%	1600
	21st to end	Day	31% 13% 3 7% 5% 4 4 3 4 4 24%	1600
December	1st to 10th	Day	30% 12% 3 7% 4 4 3 3 4 4 28%	1600
	11th to 20th	Day	39% 12% 3 7% 4 4 4 3 4 4 16%	2008
	21st to end	Day	41% 16% 4 7% 4 3 2 2 3 3 14%	2818
January	1st to 10th	Night	41% 19% 4 6% 5% 4 3 2 3 4 10%	4406
	11th to 20th	Night	40% 15% 3 6% 3 3 3 2 3 3 19%	4354
	21st to end	Night	47% 14% 3 6% 3 2 2 2 3 3 15%	4521
February	1st to 10th	Night	35% 16% 4 7% 5% 4 4 3 4 4 16%	2470
	11th to 20th	Night	32% 15% 3 8% 3 3 3 3 3 4 23%	2402
	21st to end	Night	35% 16% 3 7% 4 4 2 3 4 3 20%	2014
March	1st to 10th	Night	24% 22% 3 7% 4 4 4 3 5% 5% 18%	3462
	11th to 20th	Night	24% 15% 3 6% 3 3 2 2 3 4 35%	3490
	21st to end	Night	35% 21% 3 7% 5% 3 2 2 3 4 14%	3828
April	1st to 10th	Night	34% 16% 3 8% 4 4 2 2 3 4 19%	1905
	11th to 20th	Night	27% 16% 3 6% 5% 4 4 3 5% 6% 21%	1819
	21st to end	Night	29% 14% 3 7% 4 4 4 3 6% 5% 22%	1710
May	1st to 10th	Night	28% 13% 3 5% 3 2 2 3 3 5% 33%	2746
	11th to 20th	Night	18% 17% 4 7% 4 3 3 4 5% 6% 29%	2516
	21st to end	Night	24% 16% 2 7% 4 4 4 3 5% 6% 25%	2762
June	1st to 10th	Night	24% 10% 3 8% 6% 3 4 3 5% 6% 28%	1520
	11th to 20th	Night	22% 11% 4 7% 6% 5% 4 4 5% 7% 26%	1411
	21st to end	Night	16% 13% 3 6% 4 4 3 2 5% 6% 38%	1330
July	1st to 10th	Night	5% 8% 2 5% 2 3 3 3 4 6% 59%	2276
	11th to 20th	Night	9% 11% 2 4 3 3 3 3 4 7% 52%	2540
	21st to end	Night	9% 10% 4 10% 4 4 3 3 4 6% 43%	2904
August	1st to 10th	Night	6% 14% 3 8% 3 3 4 4 6% 9% 42%	2848
	11th to 20th	Night	13% 11% 4 7% 3 3 3 3 5% 7% 40%	2812
	21st to end	Night	13% 8% 2 6% 3 3 3 2 4 6% 49%	3296
September	1st to 10th	Night	11% 8% 2 4 3 2 2 2 5% 6% 54%	1900
	11th to 20th	Night	17% 8% 3 8% 4 3 3 3 4 5% 42%	1974
	21st to end	Night	17% 8% 2 5% 3 3 3 3 5% 6% 45%	2133
October	1st to 10th	Night	17% 6% 2 5% 3 3 2 3 4 5% 50%	3800
	11th to 20th	Night	26% 14% 2 6% 4 3 4 3 5% 6% 26%	3777
	21st to end	Night	33% 9% 3 7% 4 3 4 3 4 5% 25%	4121
November	1st to 10th	Night	35% 9% 3 7% 4 4 4 3 4 5% 20%	2661
	11th to 20th	Night	41% 9% 3 7% 4 3 3 2 4 4 20%	2800
	21st to end	Night	30% 11% 3 7% 4 5% 4 3 3 4 26%	2800
December	1st to 10th	Night	31% 12% 2 6% 4 4 4 3 4 5% 27%	2800
	11th to 20th	Night	38% 11% 3 7% 4 3 3 3 5% 5% 18%	3416
	21st to end	Night	38% 16% 3 8% 4 3 2 2 3 3 18%	4910

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	79% 8% 5% 4 2 1	2539
	11th to 20th	Day	70% 5% 6% 11% 4 4	2605
	21st to end	Day	75% 7% 4 7% 6% 1	3146
February	1st to 10th	Day	72% 7% 8% 8% 4 1	1710
	11th to 20th	Day	71% 9% 5% 9% 6% 2	1674
	21st to end	Day	72% 7% 7% 8% 5% 2	1438
March	1st to 10th	Day	65% 12% 11% 9% 4	3408
	11th to 20th	Day	54% 8% 9% 17% 11% 1	3490
	21st to end	Day	73% 11% 8% 6% 3	3825
April	1st to 10th	Day	71% 10% 9% 8% 3	2273
	11th to 20th	Day	64% 9% 9% 11% 5% 2	2306
	21st to end	Day	64% 9% 9% 12% 5% 1	2470
May	1st to 10th	Day	50% 12% 14% 12% 12%	4220
	11th to 20th	Day	36% 15% 20% 19% 10% 1	4380
	21st to end	Day	55% 17% 18% 9% 1	4814
June	1st to 10th	Day	56% 9% 15% 14% 6%	2660
	11th to 20th	Day	55% 13% 15% 13% 4	2762
	21st to end	Day	39% 8% 20% 22% 8% 3	2850
July	1st to 10th	Day	19% 5% 11% 17% 20% 29%	4604
	11th to 20th	Day	20% 7% 9% 22% 29% 14%	4345
	21st to end	Day	20% 7% 17% 32% 22% 3	4502
August	1st to 10th	Day	26% 8% 13% 24% 19% 10%	4076
	11th to 20th	Day	36% 11% 20% 22% 9% 2	4065
	21st to end	Day	30% 7% 18% 22% 18% 5%	4375
September	1st to 10th	Day	27% 8% 14% 27% 15% 9%	2280
	11th to 20th	Day	40% 9% 16% 18% 11% 5%	2203
	21st to end	Day	42% 7% 13% 21% 12% 5%	2046
October	1st to 10th	Day	38% 4 7% 23% 25% 2	3180
	11th to 20th	Day	59% 6% 12% 14% 8% 1	3161
	21st to end	Day	60% 6% 9% 14% 9% 2	3448
November	1st to 10th	Day	70% 7% 6% 12% 4 1	1634
	11th to 20th	Day	68% 7% 7% 8% 6% 3	1600
	21st to end	Day	65% 6% 5% 9% 9% 5%	1600
December	1st to 10th	Day	62% 5% 9% 10% 12% 2	1600
	11th to 20th	Day	72% 5% 10% 7% 5%	2008
	21st to end	Day	74% 8% 7% 7% 2 1	2818
January	1st to 10th	Night	78% 7% 6% 4 3 2	4406
	11th to 20th	Night	72% 5% 7% 9% 4 3	4354
	21st to end	Night	76% 4 5% 6% 6% 2	4521
February	1st to 10th	Night	73% 6% 7% 9% 4 2	2470
	11th to 20th	Night	66% 7% 9% 9% 7% 2	2404
	21st to end	Night	69% 6% 8% 8% 7% 2	2014
March	1st to 10th	Night	65% 9% 10% 13% 3	3462
	11th to 20th	Night	52% 9% 9% 16% 12% 1	3490
	21st to end	Night	72% 10% 7% 9% 2	3828
April	1st to 10th	Night	69% 7% 10% 9% 5%	1905
	11th to 20th	Night	61% 8% 11% 11% 5% 3	1819
	21st to end	Night	61% 9% 10% 12% 6% 2	1710
May	1st to 10th	Night	51% 10% 12% 17% 9% 1	2746
	11th to 20th	Night	36% 17% 21% 14% 9% 3	2516
	21st to end	Night	54% 14% 22% 8% 2	2762
June	1st to 10th	Night	53% 9% 15% 18% 5% 1	1520
	11th to 20th	Night	49% 12% 18% 16% 4	1411
	21st to end	Night	39% 8% 20% 22% 7% 4	1330
July	1st to 10th	Night	20% 6% 10% 16% 17% 32%	2240
	11th to 20th	Night	23% 8% 8% 15% 25% 19%	2492
	21st to end	Night	22% 10% 14% 27% 20% 7%	2813
August	1st to 10th	Night	24% 10% 13% 23% 19% 10%	2839
	11th to 20th	Night	34% 9% 21% 23% 8% 4	2839
	21st to end	Night	32% 8% 15% 21% 18% 6%	3296
September	1st to 10th	Night	28% 7% 13% 25% 17% 11%	1900
	11th to 20th	Night	43% 7% 12% 19% 12% 7%	1974
	21st to end	Night	38% 7% 14% 19% 15% 8%	2133
October	1st to 10th	Night	35% 6% 8% 25% 23% 3	3800
	11th to 20th	Night	55% 9% 12% 12% 10% 2	3777
	21st to end	Night	62% 5% 8% 15% 8% 2	4121
November	1st to 10th	Night	66% 8% 8% 11% 6% 1	2661
	11th to 20th	Night	69% 7% 8% 6% 6% 4	2800
	21st to end	Night	62% 6% 7% 8% 10% 7%	2800
December	1st to 10th	Night	61% 6% 9% 10% 12% 3	2800
	11th to 20th	Night	69% 9% 7% 8% 6% 1	3416
	21st to end	Night	71% 9% 7% 9% 3 1	4910

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	49% 14% 17% 11% 8% 1	180
	11th to 20th	Day	43% 13% 14% 18% 11%	219
	21st to end	Day	41% 11% 14% 20% 12% 1	407
February	1st to 10th	Day	47% 7% 16% 21% 8% 1	370
	11th to 20th	Day	41% 13% 22% 16% 8%	365
	21st to end	Day	39% 16% 22% 17% 6%	320
March	1st to 10th	Day	37% 15% 19% 22% 6% 1	460
	11th to 20th	Day	35% 10% 21% 24% 9% 2	460
	21st to end	Day	39% 17% 20% 17% 7% 1	506
April	1st to 10th	Day	36% 13% 20% 21% 9% 1	460
	11th to 20th	Day	34% 15% 22% 19% 8% 2	452
	21st to end	Day	31% 13% 24% 23% 7% 2	460
May	1st to 10th	Day	24% 13% 23% 28% 10% 2	463
	11th to 20th	Day	31% 9% 20% 25% 12% 3	488
	21st to end	Day	22% 9% 22% 29% 14% 3	529
June	1st to 10th	Day	27% 5% 23% 29% 15% 2	490
	11th to 20th	Day	22% 9% 32% 28% 8% 1	592
	21st to end	Day	13% 4 26% 41% 16% 2	680
July	1st to 10th	Day	11% 4 22% 44% 17% 2	635
	11th to 20th	Day	10% 3 24% 41% 20% 3	484
	21st to end	Day	6% 4 18% 45% 24% 4	531
August	1st to 10th	Day	10% 2 18% 41% 22% 7%	487
	11th to 20th	Day	6% 4 13% 40% 30% 7%	477
	21st to end	Day	10% 5% 24% 37% 21% 4	539
September	1st to 10th	Day	10% 4 23% 36% 22% 4	490
	11th to 20th	Day	18% 6% 21% 33% 18% 4	490
	21st to end	Day	20% 10% 23% 29% 15% 3	490
October	1st to 10th	Day	24% 8% 21% 26% 18% 2	490
	11th to 20th	Day	28% 10% 17% 25% 17% 4	490
	21st to end	Day	36% 10% 22% 19% 11% 2	539
November	1st to 10th	Day	36% 15% 22% 14% 11% 1	250
	11th to 20th	Day	40% 11% 18% 17% 13% 3	200
	21st to end	Day	33% 12% 20% 23% 14%	200
December	1st to 10th	Day	37% 12% 17% 18% 14% 3	200
	11th to 20th	Day	50% 14% 16% 15% 6% 1	200
	21st to end	Day	41% 18% 16% 18% 6% 1	204
January	1st to 10th	Night	50% 11% 13% 15% 10% 1	760
	11th to 20th	Night	44% 9% 14% 18% 12% 2	760
	21st to end	Night	40% 7% 15% 22% 14% 2	836
February	1st to 10th	Night	42% 9% 16% 23% 9% 2	760
	11th to 20th	Night	37% 12% 16% 19% 14% 1	744
	21st to end	Night	43% 12% 14% 19% 11% 1	628
March	1st to 10th	Night	42% 10% 13% 22% 11% 2	760
	11th to 20th	Night	39% 9% 13% 24% 14% 2	760
	21st to end	Night	43% 10% 14% 18% 12% 2	836
April	1st to 10th	Night	39% 10% 14% 20% 14% 2	760
	11th to 20th	Night	34% 10% 17% 22% 14% 2	691
	21st to end	Night	34% 9% 14% 28% 14% 1	570
May	1st to 10th	Night	30% 9% 15% 28% 16% 3	508
	11th to 20th	Night	32% 3 14% 22% 26% 3	374
	21st to end	Night	29% 8% 13% 25% 22% 3	411
June	1st to 10th	Night	27% 3 16% 27% 26% 2	380
	11th to 20th	Night	22% 7% 17% 31% 21% 2	380
	21st to end	Night	21% 2 13% 35% 28% 2	380
July	1st to 10th	Night	12% 1 13% 35% 34% 4	370
	11th to 20th	Night	14% 2 13% 40% 28% 4	368
	21st to end	Night	9% 2 11% 32% 39% 7%	497
August	1st to 10th	Night	12% 3 10% 27% 38% 10%	567
	11th to 20th	Night	11% 2 10% 26% 42% 9%	564
	21st to end	Night	12% 4 16% 32% 31% 5%	712
September	1st to 10th	Night	12% 3 14% 28% 36% 6%	760
	11th to 20th	Night	17% 3 14% 25% 30% 10%	760
	21st to end	Night	19% 6% 12% 33% 25% 4	760
October	1st to 10th	Night	25% 4 16% 26% 23% 6%	760
	11th to 20th	Night	26% 5% 13% 28% 21% 7%	760
	21st to end	Night	33% 8% 18% 20% 17% 4	836
November	1st to 10th	Night	37% 9% 15% 25% 13% 1	780
	11th to 20th	Night	46% 8% 13% 21% 11% 1	800
	21st to end	Night	32% 10% 19% 23% 14% 2	800
December	1st to 10th	Night	34% 9% 19% 22% 15% 2	800
	11th to 20th	Night	46% 11% 15% 18% 9% 1	800
	21st to end	Night	49% 14% 16% 15% 6% 1	850

Page generated at 2024-12-21 01:13:50. Version ac07

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