Mikes Mobile Notary Service, Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mikes Mobile Notary Service, Observatory clear sky chart from 2005-11-06 to 2024-12-06.

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% 6% 2 5% 4 4 4 4 6% 7% 46%	101336
	Night	13% 6% 2 5% 3 3 3 3 5% 7% 51%	98492
Transparency	Day	35% 5% 11% 22% 19% 9%	105118
	Night	33% 4 11% 21% 20% 11%	102837
Seeing	Day	14% 5% 19% 28% 25% 9%	14970
	Night	15% 5% 25% 36% 17% 2	24898

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	14% 8% 2 5% 3 3 3 3 5% 6% 48%	2847
	11th to 20th	Day	18% 4 1 4 2 2 2 2 4 6% 55%	2850
	21st to end	Day	20% 9% 3 6% 3 3 2 2 3 7% 42%	3235
February	1st to 10th	Day	20% 8% 3 6% 3 3 3 3 3 5% 44%	1900
	11th to 20th	Day	19% 8% 3 4 3 3 4 2 4 6% 44%	1849
	21st to end	Day	18% 7% 2 5% 3 3 3 3 3 5% 48%	1588
March	1st to 10th	Day	15% 8% 3 7% 5% 4 4 3 5% 6% 40%	3436
	11th to 20th	Day	20% 9% 3 8% 5% 5% 5% 3 5% 5% 32%	3480
	21st to end	Day	15% 8% 2 6% 4 4 3 3 5% 7% 44%	3814
April	1st to 10th	Day	15% 9% 3 6% 4 4 4 3 5% 7% 41%	2090
	11th to 20th	Day	15% 8% 3 8% 5% 4 3 3 5% 5% 42%	2080
	21st to end	Day	14% 6% 2 6% 5% 3 3 3 5% 7% 45%	2392
May	1st to 10th	Day	21% 9% 3 8% 4 4 4 4 6% 6% 31%	4082
	11th to 20th	Day	15% 6% 2 7% 4 5% 4 4 5% 7% 42%	4082
	21st to end	Day	10% 6% 2 7% 5% 5% 6% 5% 8% 9% 35%	4477
June	1st to 10th	Day	6% 4 2 6% 5% 4 6% 4 7% 9% 49%	2470
	11th to 20th	Day	7% 4 1 4 4 4 5% 5% 6% 9% 49%	2470
	21st to end	Day	5% 5% 2 7% 5% 7% 7% 5% 7% 9% 41%	2470
July	1st to 10th	Day	6% 4 2 5% 5% 4 5% 4 7% 10% 50%	4120
	11th to 20th	Day	5% 4 2 5% 4 5% 5% 4 7% 12% 47%	4120
	21st to end	Day	10% 7% 3 6% 5% 5% 6% 4 6% 11% 38%	4465
August	1st to 10th	Day	1 1 1 2 2 3 3 3 5% 8% 71%	4104
	11th to 20th	Day	4 2 1 3 3 3 4 3 7% 13% 57%	3890
	21st to end	Day	4 3 1 5% 4 5% 5% 5% 8% 11% 49%	3931
September	1st to 10th	Day	7% 6% 2 7% 5% 5% 5% 4 6% 7% 45%	2090
	11th to 20th	Day	11% 6% 2 6% 5% 5% 5% 5% 6% 7% 43%	2090
	21st to end	Day	6% 4 2 4 4 5% 6% 5% 7% 7% 50%	2090
October	1st to 10th	Day	7% 4 2 4 3 3 4 3 5% 7% 60%	2090
	11th to 20th	Day	12% 5% 2 5% 3 3 4 2 4 5% 55%	1910
	21st to end	Day	11% 4 1 5% 3 3 3 2 3 5% 59%	2090
November	1st to 10th	Day	14% 7% 2 6% 3 4 3 3 5% 6% 47%	1958
	11th to 20th	Day	11% 6% 2 4 4 4 3 3 5% 5% 53%	1925
	21st to end	Day	16% 7% 2 5% 4 4 3 3 5% 6% 46%	1800
December	1st to 10th	Day	15% 7% 2 5% 3 4 4 3 4 6% 46%	1755
	11th to 20th	Day	18% 7% 3 6% 4 3 4 3 4 4 44%	2161
	21st to end	Day	16% 7% 2 4 3 2 3 2 4 4 52%	3135
January	1st to 10th	Night	19% 7% 2 3 2 2 2 2 3 5% 53%	4108
	11th to 20th	Night	15% 4 1 3 2 1 2 2 2 4 63%	4120
	21st to end	Night	21% 6% 2 6% 4 3 3 3 4 5% 43%	4462
February	1st to 10th	Night	19% 7% 2 5% 3 3 3 2 3 5% 47%	2280
	11th to 20th	Night	20% 6% 2 5% 2 3 3 2 3 5% 48%	2218
	21st to end	Night	19% 8% 2 5% 3 2 3 3 4 5% 46%	1865
March	1st to 10th	Night	18% 8% 2 6% 4 5% 4 3 5% 6% 39%	3419
	11th to 20th	Night	21% 10% 3 8% 4 4 4 3 5% 5% 33%	3480
	21st to end	Night	14% 7% 3 8% 4 4 4 3 5% 5% 43%	3817
April	1st to 10th	Night	13% 6% 2 5% 4 4 4 4 5% 7% 46%	2090
	11th to 20th	Night	17% 7% 2 5% 4 3 4 3 5% 7% 44%	2046
	21st to end	Night	16% 6% 2 5% 4 3 3 2 5% 6% 48%	1782
May	1st to 10th	Night	23% 8% 3 6% 4 4 3 3 6% 6% 35%	2823
	11th to 20th	Night	11% 6% 2 6% 4 3 4 4 4 7% 48%	2823
	21st to end	Night	12% 6% 2 6% 3 4 5% 4 6% 9% 43%	3090
June	1st to 10th	Night	4 3 1 3 3 3 3 3 7% 10% 60%	1710
	11th to 20th	Night	5% 3 1 4 4 3 4 4 6% 9% 58%	1710
	21st to end	Night	5% 4 1 4 4 4 6% 4 7% 10% 52%	1710
July	1st to 10th	Night	5% 3 1 4 4 3 4 4 7% 10% 55%	2850
	11th to 20th	Night	4 4 1 4 3 3 5% 4 7% 10% 55%	2850
	21st to end	Night	9% 6% 3 5% 5% 5% 5% 4 6% 11% 42%	3098
August	1st to 10th	Night	1 1 1 1 2 2 3 5% 8% 76%	2836
	11th to 20th	Night	3 2 1 4 3 3 4 4 7% 11% 60%	2944
	21st to end	Night	3 2 1 4 3 3 4 4 7% 11% 57%	3725
September	1st to 10th	Night	7% 4 2 5% 4 4 4 4 6% 8% 52%	2090
	11th to 20th	Night	10% 5% 2 6% 4 5% 4 4 5% 7% 48%	2090
	21st to end	Night	7% 4 1 4 3 5% 4 3 6% 8% 55%	2090
October	1st to 10th	Night	5% 3 1 3 3 4 3 3 4 6% 65%	2090
	11th to 20th	Night	11% 5% 2 4 3 3 3 3 4 6% 57%	2248
	21st to end	Night	14% 3 1 4 2 2 3 2 4 4 61%	2508
November	1st to 10th	Night	13% 6% 2 4 3 4 3 3 4 6% 53%	2340
	11th to 20th	Night	11% 6% 2 5% 4 3 3 3 4 6% 55%	2470
	21st to end	Night	18% 5% 2 5% 3 3 4 3 3 6% 49%	2600
December	1st to 10th	Night	15% 8% 2 5% 3 3 4 3 4 6% 49%	2542
	11th to 20th	Night	17% 8% 2 6% 3 3 3 3 4 5% 46%	3036
	21st to end	Night	18% 6% 2 4 3 2 2 2 2 5% 53%	4532

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	38% 3 5% 19% 23% 13%	2848
	11th to 20th	Day	33% 3 6% 19% 29% 11%	2850
	21st to end	Day	46% 2 4 11% 26% 11%	3235
February	1st to 10th	Day	44% 4 6% 13% 20% 13%	1900
	11th to 20th	Day	43% 3 6% 17% 19% 11%	1859
	21st to end	Day	42% 2 6% 19% 17% 14%	1588
March	1st to 10th	Day	45% 4 6% 16% 20% 9%	3436
	11th to 20th	Day	54% 4 8% 10% 15% 8%	3480
	21st to end	Day	41% 3 9% 17% 23% 7%	3814
April	1st to 10th	Day	44% 4 8% 17% 15% 12%	2090
	11th to 20th	Day	45% 3 7% 15% 19% 11%	2080
	21st to end	Day	40% 4 6% 21% 21% 8%	2392
May	1st to 10th	Day	52% 5% 11% 15% 13% 5%	4120
	11th to 20th	Day	41% 4 10% 19% 21% 5%	4086
	21st to end	Day	40% 7% 12% 29% 11% 1	4489
June	1st to 10th	Day	29% 5% 15% 28% 20% 4	2470
	11th to 20th	Day	30% 5% 12% 29% 19% 6%	2470
	21st to end	Day	36% 7% 12% 25% 16% 3	2470
July	1st to 10th	Day	27% 6% 20% 38% 7% 1	4056
	11th to 20th	Day	28% 7% 18% 29% 16% 2	4051
	21st to end	Day	38% 8% 19% 27% 8% 1	4325
August	1st to 10th	Day	12% 4 12% 41% 29% 1	4090
	11th to 20th	Day	19% 5% 23% 38% 12% 2	3929
	21st to end	Day	25% 11% 20% 24% 18% 2	3930
September	1st to 10th	Day	37% 6% 10% 22% 17% 9%	2090
	11th to 20th	Day	38% 6% 12% 19% 19% 5%	2090
	21st to end	Day	30% 6% 9% 22% 18% 15%	2090
October	1st to 10th	Day	16% 3 6% 14% 23% 38%	3480
	11th to 20th	Day	20% 3 7% 19% 32% 19%	3150
	21st to end	Day	25% 4 5% 21% 32% 15%	3428
November	1st to 10th	Day	38% 4 8% 18% 20% 11%	1958
	11th to 20th	Day	34% 3 8% 19% 21% 15%	1925
	21st to end	Day	41% 2 7% 17% 19% 13%	1800
December	1st to 10th	Day	41% 2 10% 19% 21% 8%	1755
	11th to 20th	Day	43% 3 7% 12% 23% 12%	2159
	21st to end	Day	37% 3 5% 15% 28% 13%	3135
January	1st to 10th	Night	37% 2 5% 17% 23% 17%	4108
	11th to 20th	Night	29% 2 4 16% 32% 17%	4120
	21st to end	Night	45% 2 4 13% 24% 11%	4462
February	1st to 10th	Night	41% 3 6% 14% 19% 17%	2280
	11th to 20th	Night	41% 3 6% 16% 20% 14%	2218
	21st to end	Night	42% 3 5% 16% 17% 16%	1865
March	1st to 10th	Night	46% 5% 7% 16% 17% 9%	3419
	11th to 20th	Night	53% 4 10% 12% 14% 8%	3480
	21st to end	Night	43% 4 9% 14% 21% 9%	3817
April	1st to 10th	Night	39% 4 8% 18% 17% 14%	2090
	11th to 20th	Night	40% 3 10% 16% 16% 15%	2046
	21st to end	Night	39% 3 8% 22% 19% 9%	1782
May	1st to 10th	Night	49% 4 8% 20% 13% 5%	2850
	11th to 20th	Night	35% 5% 11% 24% 18% 7%	2824
	21st to end	Night	37% 5% 15% 30% 11% 2	3099
June	1st to 10th	Night	20% 4 19% 30% 23% 3	1710
	11th to 20th	Night	21% 6% 15% 32% 20% 5%	1710
	21st to end	Night	26% 7% 16% 31% 17% 3	1710
July	1st to 10th	Night	24% 7% 26% 36% 6% 1	2805
	11th to 20th	Night	23% 7% 21% 33% 15% 1	2796
	21st to end	Night	35% 8% 23% 27% 7%	2999
August	1st to 10th	Night	8% 4 15% 43% 27% 1	2826
	11th to 20th	Night	18% 6% 30% 32% 13% 2	2971
	21st to end	Night	20% 11% 23% 29% 15% 2	3725
September	1st to 10th	Night	30% 6% 17% 24% 16% 8%	2090
	11th to 20th	Night	34% 6% 14% 23% 15% 7%	2090
	21st to end	Night	28% 4 15% 22% 18% 14%	2090
October	1st to 10th	Night	15% 3 7% 17% 19% 40%	3480
	11th to 20th	Night	19% 3 8% 17% 32% 22%	3734
	21st to end	Night	22% 3 5% 22% 30% 17%	4120
November	1st to 10th	Night	34% 3 9% 19% 21% 14%	2340
	11th to 20th	Night	32% 3 7% 19% 22% 16%	2470
	21st to end	Night	39% 2 8% 18% 18% 15%	2600
December	1st to 10th	Night	39% 3 7% 21% 19% 11%	2542
	11th to 20th	Night	41% 3 5% 13% 23% 16%	3037
	21st to end	Night	36% 2 4 15% 29% 13%	4532

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% 10% 35% 25% 8% 1	270
	11th to 20th	Day	27% 9% 26% 29% 7% 2	270
	21st to end	Day	22% 10% 36% 22% 9% 1	297
February	1st to 10th	Day	30% 10% 28% 23% 8% 1	270
	11th to 20th	Day	28% 15% 33% 20% 4 1	270
	21st to end	Day	28% 11% 42% 17% 2	225
March	1st to 10th	Day	21% 12% 36% 23% 7% 1	270
	11th to 20th	Day	20% 11% 39% 23% 6% 1	270
	21st to end	Day	19% 11% 40% 23% 6% 1	297
April	1st to 10th	Day	23% 14% 37% 20% 5% 1	270
	11th to 20th	Day	21% 11% 32% 24% 10% 1	278
	21st to end	Day	21% 8% 36% 24% 9% 2	572
May	1st to 10th	Day	20% 4 36% 29% 11%	653
	11th to 20th	Day	21% 3 26% 32% 15% 3	675
	21st to end	Day	14% 4 23% 37% 18% 4	734
June	1st to 10th	Day	7% 11% 42% 31% 8%	680
	11th to 20th	Day	7% 1 10% 48% 27% 7%	680
	21st to end	Day	5% 2 10% 34% 36% 13%	680
July	1st to 10th	Day	7% 1 5% 34% 37% 15%	671
	11th to 20th	Day	4 1 4 28% 49% 14%	668
	21st to end	Day	5% 1 4 27% 48% 15%	739
August	1st to 10th	Day	3 1 2 23% 53% 18%	676
	11th to 20th	Day	6% 1 1 26% 48% 18%	579
	21st to end	Day	6% 1 2 21% 36% 34%	394
September	1st to 10th	Day	7% 1 3 22% 39% 29%	300
	11th to 20th	Day	6% 1 4 23% 41% 25%	300
	21st to end	Day	9% 1 4 24% 39% 22%	300
October	1st to 10th	Day	5% 1 10% 26% 42% 16%	300
	11th to 20th	Day	11% 2 20% 32% 25% 9%	300
	21st to end	Day	19% 8% 22% 25% 21% 6%	330
November	1st to 10th	Day	19% 5% 20% 33% 17% 7%	300
	11th to 20th	Day	18% 5% 27% 27% 20% 3	300
	21st to end	Day	17% 14% 33% 21% 12% 2	300
December	1st to 10th	Day	16% 5% 33% 27% 13% 6%	285
	11th to 20th	Day	26% 11% 27% 24% 12%	270
	21st to end	Day	22% 8% 35% 25% 8% 2	297
January	1st to 10th	Night	19% 8% 31% 33% 9%	950
	11th to 20th	Night	22% 9% 28% 33% 8%	950
	21st to end	Night	21% 9% 30% 33% 7%	1001
February	1st to 10th	Night	24% 11% 31% 26% 7%	760
	11th to 20th	Night	25% 10% 36% 27% 3	744
	21st to end	Night	26% 13% 39% 19% 3	609
March	1st to 10th	Night	22% 11% 37% 27% 3	570
	11th to 20th	Night	21% 8% 35% 31% 5%	570
	21st to end	Night	15% 10% 45% 27% 4	627
April	1st to 10th	Night	16% 8% 42% 31% 3	570
	11th to 20th	Night	20% 7% 40% 29% 4	563
	21st to end	Night	17% 7% 42% 26% 8% 1	570
May	1st to 10th	Night	17% 7% 42% 28% 5% 1	570
	11th to 20th	Night	14% 3 33% 36% 13% 1	561
	21st to end	Night	14% 2 29% 40% 14% 1	617
June	1st to 10th	Night	6% 1 19% 46% 26% 1	570
	11th to 20th	Night	5% 2 26% 49% 17% 1	570
	21st to end	Night	5% 1 14% 47% 29% 5%	570
July	1st to 10th	Night	7% 2 6% 49% 32% 4	555
	11th to 20th	Night	4 1 7% 51% 33% 3	552
	21st to end	Night	4 1 7% 48% 37% 3	624
August	1st to 10th	Night	1 6% 51% 39% 4	567
	11th to 20th	Night	6% 5% 48% 34% 6%	564
	21st to end	Night	5% 1 4 36% 46% 8%	627
September	1st to 10th	Night	8% 2 6% 41% 38% 6%	570
	11th to 20th	Night	11% 1 4 37% 41% 5%	570
	21st to end	Night	9% 2 10% 38% 36% 4	570
October	1st to 10th	Night	6% 12% 48% 29% 5%	570
	11th to 20th	Night	13% 3 21% 40% 21% 2	728
	21st to end	Night	16% 5% 26% 31% 20% 1	836
November	1st to 10th	Night	15% 4 21% 39% 20% 1	780
	11th to 20th	Night	14% 5% 26% 39% 14% 1	870
	21st to end	Night	22% 6% 30% 28% 13% 1	1000
December	1st to 10th	Night	21% 6% 28% 33% 11% 1	978
	11th to 20th	Night	25% 8% 26% 33% 7%	950
	21st to end	Night	21% 7% 29% 35% 7%	1045

Page generated at 2024-12-03 05:45:12. Version ac07

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