Lino Lakes
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lino Lakes clear sky chart from 2005-11-06 to 2026-03-18.

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	12% 9% 3 8% 5% 4 4 4 5% 7% 38%	131697
	Night	11% 10% 4 9% 5% 4 4 4 5% 6% 38%	130126
Transparency	Day	44% 5% 13% 25% 11% 1	135261
	Night	45% 5% 13% 23% 12% 1	134639
Seeing	Day	16% 10% 30% 27% 13% 3	17834
	Night	16% 9% 31% 32% 11% 1	27893

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	8% 14% 7% 19% 8% 5% 4 3 4 6% 21%	4691
	11th to 20th	Day	6% 12% 7% 13% 7% 7% 8% 7% 8% 5% 22%	4710
	21st to end	Day	4 12% 6% 12% 5% 5% 7% 4 6% 7% 33%	5794
February	1st to 10th	Day	8% 12% 5% 10% 8% 5% 6% 5% 5% 6% 30%	1890
	11th to 20th	Day	8% 11% 5% 10% 6% 5% 5% 4 5% 6% 36%	1844
	21st to end	Day	9% 12% 5% 11% 5% 5% 5% 4 5% 7% 33%	1625
March	1st to 10th	Day	12% 9% 3 6% 4 4 4 2 5% 8% 43%	4904
	11th to 20th	Day	9% 10% 3 8% 5% 5% 4 4 5% 8% 39%	5057
	21st to end	Day	21% 11% 4 9% 6% 5% 4 4 4 6% 27%	5546
April	1st to 10th	Day	16% 11% 3 6% 5% 4 4 4 6% 7% 34%	2400
	11th to 20th	Day	19% 12% 3 7% 5% 5% 5% 3 4 5% 32%	2379
	21st to end	Day	20% 11% 3 7% 5% 5% 4 3 5% 6% 31%	2600
May	1st to 10th	Day	14% 6% 2 5% 4 3 3 3 4 6% 49%	6155
	11th to 20th	Day	16% 8% 2 5% 4 4 3 3 5% 6% 43%	6319
	21st to end	Day	16% 8% 3 7% 4 4 4 4 5% 7% 37%	6935
June	1st to 10th	Day	11% 5% 2 4 4 4 4 4 7% 8% 46%	2800
	11th to 20th	Day	13% 7% 3 7% 6% 5% 5% 4 7% 9% 35%	2800
	21st to end	Day	11% 5% 1 6% 5% 5% 5% 5% 8% 10% 39%	2800
July	1st to 10th	Day	8% 5% 2 5% 4 4 5% 4 7% 11% 44%	6360
	11th to 20th	Day	8% 4 2 4 3 3 3 3 5% 9% 57%	6360
	21st to end	Day	7% 5% 2 6% 4 4 5% 4 7% 9% 47%	6889
August	1st to 10th	Day	11% 6% 2 6% 4 5% 5% 4 6% 9% 43%	4234
	11th to 20th	Day	13% 5% 2 6% 4 4 4 4 6% 8% 43%	4171
	21st to end	Day	9% 6% 2 7% 4 4 5% 4 5% 7% 46%	4457
September	1st to 10th	Day	11% 5% 2 5% 4 4 5% 4 6% 8% 46%	2400
	11th to 20th	Day	12% 5% 2 5% 4 5% 5% 4 7% 8% 43%	2384
	21st to end	Day	13% 6% 2 6% 4 4 4 3 5% 6% 46%	2095
October	1st to 10th	Day	15% 6% 2 6% 3 4 4 4 5% 7% 43%	2000
	11th to 20th	Day	15% 10% 3 7% 5% 4 5% 3 5% 7% 37%	2000
	21st to end	Day	16% 13% 3 8% 4 3 4 3 5% 5% 37%	2160
November	1st to 10th	Day	10% 13% 4 9% 5% 4 4 4 5% 5% 36%	1730
	11th to 20th	Day	11% 15% 6% 11% 6% 4 3 3 5% 5% 29%	1680
	21st to end	Day	13% 13% 5% 9% 4 5% 4 3 6% 7% 32%	1680
December	1st to 10th	Day	8% 11% 5% 16% 12% 7% 5% 4 5% 5% 22%	2690
	11th to 20th	Day	10% 16% 7% 12% 6% 5% 4 3 5% 5% 28%	3088
	21st to end	Day	18% 21% 8% 19% 6% 4 3 2 3 3 14%	4070
January	1st to 10th	Night	8% 13% 6% 14% 7% 5% 4 4 5% 6% 29%	8232
	11th to 20th	Night	6% 12% 5% 13% 8% 7% 9% 8% 7% 5% 21%	8280
	21st to end	Night	6% 13% 5% 10% 6% 5% 6% 3 5% 6% 35%	8403
February	1st to 10th	Night	6% 12% 5% 10% 7% 5% 5% 3 5% 6% 34%	2730
	11th to 20th	Night	7% 10% 4 8% 6% 6% 5% 4 5% 8% 38%	2663
	21st to end	Night	11% 9% 4 9% 6% 6% 4 4 5% 6% 36%	2179
March	1st to 10th	Night	10% 7% 3 6% 4 4 4 3 5% 8% 46%	5211
	11th to 20th	Night	10% 8% 3 7% 5% 5% 5% 4 7% 10% 37%	5057
	21st to end	Night	24% 12% 4 10% 4 3 3 3 4 5% 28%	5382
April	1st to 10th	Night	17% 10% 3 7% 4 4 4 4 4 7% 36%	2000
	11th to 20th	Night	19% 10% 4 7% 5% 4 3 3 5% 5% 36%	1966
	21st to end	Night	18% 10% 3 7% 4 4 4 4 4 6% 35%	1800
May	1st to 10th	Night	11% 7% 3 6% 4 4 3 3 4 5% 51%	3760
	11th to 20th	Night	14% 6% 2 4 3 3 3 3 5% 7% 50%	3596
	21st to end	Night	15% 9% 3 7% 5% 3 4 4 6% 8% 39%	3942
June	1st to 10th	Night	10% 5% 2 5% 4 3 4 4 7% 8% 47%	1600
	11th to 20th	Night	9% 6% 2 5% 5% 5% 5% 4 7% 7% 46%	1600
	21st to end	Night	8% 5% 2 5% 3 4 5% 4 7% 8% 51%	1600
July	1st to 10th	Night	8% 4 1 5% 4 4 4 4 7% 9% 51%	3618
	11th to 20th	Night	6% 3 2 5% 3 4 4 4 7% 9% 54%	3617
	21st to end	Night	6% 5% 2 5% 4 4 5% 4 6% 7% 51%	3978
August	1st to 10th	Night	11% 6% 3 7% 4 3 4 3 5% 7% 47%	2926
	11th to 20th	Night	13% 4 1 5% 4 4 3 4 5% 8% 48%	2888
	21st to end	Night	8% 7% 2 6% 4 4 5% 3 6% 8% 47%	3444
September	1st to 10th	Night	8% 4 2 5% 4 4 4 3 6% 7% 52%	2000
	11th to 20th	Night	8% 5% 2 5% 3 3 4 4 6% 7% 53%	2014
	21st to end	Night	13% 5% 2 5% 4 3 3 3 5% 6% 52%	2285
October	1st to 10th	Night	14% 6% 2 6% 4 3 3 3 5% 6% 50%	2400
	11th to 20th	Night	16% 10% 2 6% 4 4 4 3 4 7% 40%	2400
	21st to end	Night	17% 11% 3 7% 4 3 4 3 4 6% 37%	2680
November	1st to 10th	Night	13% 10% 4 6% 5% 4 5% 4 5% 6% 40%	2786
	11th to 20th	Night	12% 12% 4 11% 6% 4 4 3 4 5% 34%	2940
	21st to end	Night	14% 10% 4 9% 5% 5% 4 3 5% 7% 34%	2940
December	1st to 10th	Night	7% 10% 5% 14% 8% 7% 5% 4 5% 6% 29%	4720
	11th to 20th	Night	10% 16% 6% 15% 6% 5% 4 5% 5% 5% 24%	5339
	21st to end	Night	19% 16% 9% 15% 5% 4 3 3 4 4 18%	7150

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	65% 4 10% 16% 6%	4692
	11th to 20th	Day	60% 4 10% 16% 10%	4710
	21st to end	Day	49% 4 14% 22% 10%	5794
February	1st to 10th	Day	52% 6% 15% 19% 7% 1	1890
	11th to 20th	Day	49% 5% 12% 26% 8%	1853
	21st to end	Day	51% 5% 13% 21% 9% 1	1625
March	1st to 10th	Day	39% 5% 19% 25% 10% 3	4904
	11th to 20th	Day	42% 5% 14% 30% 9% 1	5057
	21st to end	Day	59% 5% 10% 18% 8% 1	5548
April	1st to 10th	Day	49% 5% 12% 21% 12% 1	2400
	11th to 20th	Day	53% 6% 10% 18% 12% 1	2379
	21st to end	Day	54% 5% 12% 19% 9%	2600
May	1st to 10th	Day	35% 5% 13% 28% 17% 2	6194
	11th to 20th	Day	40% 5% 11% 23% 15% 5%	6323
	21st to end	Day	44% 7% 10% 29% 10% 1	6949
June	1st to 10th	Day	33% 7% 15% 31% 12% 2	2800
	11th to 20th	Day	44% 7% 15% 21% 13% 1	2800
	21st to end	Day	37% 8% 17% 26% 10% 2	2800
July	1st to 10th	Day	32% 7% 18% 33% 10%	6291
	11th to 20th	Day	26% 5% 16% 37% 15% 1	6285
	21st to end	Day	32% 7% 15% 29% 16% 1	6693
August	1st to 10th	Day	37% 6% 14% 29% 12% 1	4220
	11th to 20th	Day	36% 6% 13% 34% 10%	4210
	21st to end	Day	36% 5% 17% 28% 13% 1	4456
September	1st to 10th	Day	35% 6% 15% 33% 11%	2400
	11th to 20th	Day	36% 7% 18% 31% 8%	2384
	21st to end	Day	39% 5% 11% 33% 12%	2095
October	1st to 10th	Day	30% 4 9% 36% 21%	3260
	11th to 20th	Day	40% 5% 11% 27% 16% 1	3240
	21st to end	Day	44% 4 15% 28% 9%	3474
November	1st to 10th	Day	49% 6% 13% 18% 12% 2	1730
	11th to 20th	Day	57% 4 13% 17% 8%	1680
	21st to end	Day	51% 7% 16% 19% 6% 1	1680
December	1st to 10th	Day	63% 5% 14% 13% 4 1	2690
	11th to 20th	Day	59% 3 13% 19% 6%	3085
	21st to end	Day	76% 4 8% 8% 4	4070
January	1st to 10th	Night	57% 4 15% 16% 7%	8233
	11th to 20th	Night	61% 4 11% 14% 9%	8280
	21st to end	Night	50% 4 11% 25% 10%	8403
February	1st to 10th	Night	50% 5% 13% 21% 10% 1	2730
	11th to 20th	Night	44% 6% 14% 26% 9% 1	2664
	21st to end	Night	48% 5% 12% 22% 11% 1	2179
March	1st to 10th	Night	37% 5% 14% 25% 16% 3	5211
	11th to 20th	Night	38% 6% 17% 26% 13% 1	5057
	21st to end	Night	59% 4 10% 16% 10% 1	5382
April	1st to 10th	Night	47% 5% 9% 23% 15% 1	2000
	11th to 20th	Night	50% 5% 10% 20% 14% 3	1966
	21st to end	Night	49% 7% 9% 20% 14% 2	1800
May	1st to 10th	Night	35% 5% 11% 27% 20% 2	3786
	11th to 20th	Night	34% 5% 12% 23% 19% 8%	3597
	21st to end	Night	43% 6% 11% 26% 13% 1	3950
June	1st to 10th	Night	32% 8% 14% 28% 17% 2	1600
	11th to 20th	Night	35% 7% 15% 24% 17% 3	1600
	21st to end	Night	29% 6% 17% 30% 15% 3	1600
July	1st to 10th	Night	28% 7% 18% 31% 14% 1	3580
	11th to 20th	Night	25% 6% 15% 37% 15% 1	3572
	21st to end	Night	31% 7% 15% 28% 17% 2	3863
August	1st to 10th	Night	37% 5% 12% 28% 14% 4	2916
	11th to 20th	Night	33% 6% 14% 32% 14% 1	2915
	21st to end	Night	35% 7% 17% 28% 11% 2	3444
September	1st to 10th	Night	30% 6% 15% 33% 16% 1	2000
	11th to 20th	Night	30% 6% 18% 31% 16%	2014
	21st to end	Night	34% 4 12% 33% 15% 1	2285
October	1st to 10th	Night	24% 3 7% 35% 26% 4	3920
	11th to 20th	Night	35% 5% 12% 24% 21% 3	3899
	21st to end	Night	45% 4 12% 27% 12%	4316
November	1st to 10th	Night	44% 6% 12% 24% 13% 1	2786
	11th to 20th	Night	53% 4 13% 19% 10% 1	2940
	21st to end	Night	50% 5% 16% 22% 6% 1	2940
December	1st to 10th	Night	55% 6% 17% 18% 4	4720
	11th to 20th	Night	63% 5% 10% 17% 5% 1	5341
	21st to end	Night	71% 3 9% 12% 4	7150

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	15% 10% 35% 27% 11% 3	330
	11th to 20th	Day	17% 12% 38% 28% 5% 1	330
	21st to end	Day	16% 11% 39% 25% 9% 1	363
February	1st to 10th	Day	17% 16% 40% 21% 5% 1	330
	11th to 20th	Day	15% 15% 40% 24% 5% 1	330
	21st to end	Day	14% 16% 41% 26% 3	273
March	1st to 10th	Day	17% 14% 44% 18% 6%	330
	11th to 20th	Day	19% 12% 38% 21% 8% 1	321
	21st to end	Day	26% 13% 31% 20% 7% 2	363
April	1st to 10th	Day	23% 16% 34% 22% 5% 1	500
	11th to 20th	Day	31% 12% 25% 23% 8% 1	497
	21st to end	Day	30% 11% 28% 21% 8% 2	700
May	1st to 10th	Day	20% 14% 27% 26% 11% 1	703
	11th to 20th	Day	20% 11% 28% 24% 14% 3	725
	21st to end	Day	17% 11% 25% 27% 16% 4	789
June	1st to 10th	Day	10% 8% 27% 32% 18% 5%	730
	11th to 20th	Day	15% 8% 34% 31% 10% 3	730
	21st to end	Day	14% 7% 31% 28% 14% 6%	730
July	1st to 10th	Day	9% 4 21% 34% 22% 11%	721
	11th to 20th	Day	10% 6% 26% 31% 19% 8%	718
	21st to end	Day	6% 5% 26% 35% 21% 7%	794
August	1st to 10th	Day	10% 5% 23% 33% 24% 6%	726
	11th to 20th	Day	14% 5% 20% 31% 23% 6%	715
	21st to end	Day	12% 6% 24% 31% 21% 6%	676
September	1st to 10th	Day	15% 6% 26% 29% 19% 4	530
	11th to 20th	Day	12% 5% 27% 31% 20% 4	514
	21st to end	Day	15% 9% 29% 23% 16% 7%	330
October	1st to 10th	Day	16% 11% 30% 24% 15% 5%	330
	11th to 20th	Day	19% 16% 37% 19% 7% 1	330
	21st to end	Day	23% 14% 39% 18% 6% 1	363
November	1st to 10th	Day	21% 13% 35% 23% 7% 2	330
	11th to 20th	Day	19% 18% 37% 21% 5%	330
	21st to end	Day	22% 14% 39% 20% 4	330
December	1st to 10th	Day	13% 12% 43% 23% 8% 1	330
	11th to 20th	Day	21% 17% 33% 25% 4	330
	21st to end	Day	27% 16% 34% 20% 2 1	363
January	1st to 10th	Night	12% 13% 34% 32% 9%	1050
	11th to 20th	Night	17% 11% 36% 29% 6% 1	1050
	21st to end	Night	17% 11% 37% 29% 6% 1	1155
February	1st to 10th	Night	13% 13% 39% 28% 7% 1	1050
	11th to 20th	Night	12% 12% 40% 28% 7%	1029
	21st to end	Night	16% 12% 36% 28% 8%	795
March	1st to 10th	Night	16% 11% 36% 29% 8%	714
	11th to 20th	Night	19% 11% 38% 26% 7%	621
	21st to end	Night	22% 11% 31% 24% 11% 1	660
April	1st to 10th	Night	20% 12% 33% 29% 6%	600
	11th to 20th	Night	22% 10% 31% 29% 7%	593
	21st to end	Night	23% 10% 32% 27% 8% 1	600
May	1st to 10th	Night	19% 11% 33% 30% 7% 1	600
	11th to 20th	Night	17% 8% 32% 32% 11% 1	591
	21st to end	Night	13% 8% 26% 38% 15% 1	650
June	1st to 10th	Night	12% 6% 26% 41% 15%	600
	11th to 20th	Night	11% 4 30% 46% 9%	600
	21st to end	Night	10% 5% 23% 46% 15% 2	600
July	1st to 10th	Night	6% 2 18% 43% 29% 2	585
	11th to 20th	Night	7% 4 24% 44% 20% 1	582
	21st to end	Night	5% 1 24% 47% 20% 2	657
August	1st to 10th	Night	8% 5% 15% 49% 22% 1	597
	11th to 20th	Night	13% 4 18% 35% 28% 2	594
	21st to end	Night	8% 4 23% 40% 22% 2	660
September	1st to 10th	Night	11% 5% 23% 39% 20% 2	600
	11th to 20th	Night	10% 6% 28% 36% 17% 3	600
	21st to end	Night	14% 8% 29% 33% 15% 1	685
October	1st to 10th	Night	17% 9% 28% 33% 13% 1	800
	11th to 20th	Night	21% 9% 33% 28% 8% 1	800
	21st to end	Night	24% 10% 28% 31% 7%	880
November	1st to 10th	Night	19% 11% 32% 30% 7% 1	940
	11th to 20th	Night	18% 14% 35% 26% 7% 1	1050
	21st to end	Night	19% 14% 36% 24% 7%	1050
December	1st to 10th	Night	16% 10% 37% 29% 7% 1	1050
	11th to 20th	Night	20% 11% 36% 25% 7%	1050
	21st to end	Night	24% 12% 33% 25% 5%	1155

Page generated at 2026-03-15 01:23:56. Version ac07

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