Pace/Milton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pace/Milton clear sky chart from 2005-11-06 to 2024-11-05.

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	10% 5% 2 6% 5% 5% 5% 4 7% 9% 41%	100663
	Night	10% 6% 2 6% 4 4 4 4 6% 9% 45%	98358
Transparency	Day	36% 9% 14% 18% 16% 8%	104578
	Night	34% 8% 14% 17% 19% 9%	102581
Seeing	Day	11% 7% 20% 26% 22% 13%	14561
	Night	12% 6% 20% 30% 25% 7%	24480

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% 5% 2 5% 4 4 4 4 5% 7% 45%	2941
	11th to 20th	Day	11% 5% 1 4 3 3 3 3 6% 8% 53%	3160
	21st to end	Day	25% 7% 2 5% 4 3 3 3 5% 6% 37%	3476
February	1st to 10th	Day	18% 5% 3 7% 5% 4 4 3 4 6% 41%	1900
	11th to 20th	Day	15% 6% 2 5% 4 4 5% 4 6% 7% 43%	1848
	21st to end	Day	14% 7% 2 7% 4 5% 5% 4 6% 7% 39%	1570
March	1st to 10th	Day	20% 10% 3 7% 4 4 4 3 5% 6% 35%	3120
	11th to 20th	Day	11% 6% 2 6% 5% 5% 5% 3 7% 9% 41%	3310
	21st to end	Day	16% 6% 2 6% 4 4 4 4 5% 6% 44%	4055
April	1st to 10th	Day	11% 7% 2 6% 4 4 3 3 6% 8% 45%	2280
	11th to 20th	Day	12% 5% 3 6% 4 4 5% 3 6% 7% 45%	2254
	21st to end	Day	7% 5% 2 5% 4 4 3 3 6% 7% 54%	2280
May	1st to 10th	Day	7% 4 2 5% 3 4 5% 4 7% 10% 49%	3782
	11th to 20th	Day	13% 5% 2 7% 5% 5% 4 4 6% 8% 42%	4081
	21st to end	Day	5% 3 1 5% 5% 5% 5% 4 7% 11% 48%	4476
June	1st to 10th	Day	7% 7% 3 8% 6% 7% 6% 4 9% 12% 30%	2470
	11th to 20th	Day	5% 4 2 6% 6% 7% 7% 6% 12% 13% 34%	2470
	21st to end	Day	6% 4 2 8% 7% 6% 7% 6% 10% 13% 30%	2470
July	1st to 10th	Day	6% 6% 3 9% 7% 8% 8% 7% 10% 12% 24%	4120
	11th to 20th	Day	4 5% 2 8% 8% 8% 9% 7% 10% 13% 27%	3970
	21st to end	Day	4 5% 3 8% 8% 9% 9% 8% 11% 14% 21%	4118
August	1st to 10th	Day	4 3 1 5% 5% 6% 7% 6% 10% 14% 39%	3785
	11th to 20th	Day	5% 4 2 6% 5% 5% 7% 5% 8% 11% 42%	3729
	21st to end	Day	6% 4 2 7% 6% 7% 7% 6% 9% 12% 33%	4180
September	1st to 10th	Day	11% 5% 2 7% 6% 6% 7% 5% 8% 10% 32%	2233
	11th to 20th	Day	11% 7% 3 8% 5% 5% 6% 4 7% 8% 36%	2090
	21st to end	Day	8% 5% 2 6% 4 5% 5% 4 6% 6% 49%	2090
October	1st to 10th	Day	8% 4 2 5% 4 4 3 4 5% 8% 53%	2090
	11th to 20th	Day	8% 4 1 4 3 3 4 3 5% 8% 57%	2090
	21st to end	Day	9% 4 2 6% 5% 3 4 3 5% 5% 56%	2110
November	1st to 10th	Day	7% 5% 2 4 3 3 3 3 6% 5% 58%	1708
	11th to 20th	Day	9% 4 2 5% 3 3 3 3 6% 8% 53%	1710
	21st to end	Day	11% 5% 1 6% 3 4 5% 4 5% 7% 48%	1710
December	1st to 10th	Day	12% 6% 2 6% 5% 4 5% 4 5% 6% 45%	1710
	11th to 20th	Day	15% 8% 3 7% 5% 4 4 3 4 6% 42%	2153
	21st to end	Day	16% 10% 3 6% 4 4 3 3 4 6% 40%	3124
January	1st to 10th	Night	17% 6% 2 5% 4 4 4 4 5% 5% 45%	4000
	11th to 20th	Night	13% 6% 2 5% 4 3 4 3 4 6% 49%	3800
	21st to end	Night	24% 8% 3 5% 3 2 3 3 4 5% 40%	4180
February	1st to 10th	Night	13% 8% 3 7% 4 3 4 3 5% 6% 45%	2280
	11th to 20th	Night	18% 7% 2 5% 3 3 3 3 5% 5% 46%	2218
	21st to end	Night	16% 8% 2 7% 4 4 5% 4 5% 5% 40%	1884
March	1st to 10th	Night	21% 12% 4 8% 4 3 3 3 4 6% 32%	3733
	11th to 20th	Night	10% 7% 2 6% 4 4 4 4 7% 8% 43%	3647
	21st to end	Night	13% 7% 3 6% 3 4 4 3 5% 7% 45%	3604
April	1st to 10th	Night	13% 6% 3 5% 4 4 4 4 6% 7% 45%	1900
	11th to 20th	Night	12% 6% 1 5% 4 3 4 4 6% 7% 47%	1875
	21st to end	Night	6% 3 1 4 4 3 3 3 4 7% 62%	1900
May	1st to 10th	Night	9% 7% 2 7% 5% 4 5% 4 6% 9% 43%	3112
	11th to 20th	Night	11% 6% 2 7% 4 4 4 4 5% 8% 44%	2812
	21st to end	Night	4 4 2 5% 4 4 5% 4 7% 11% 51%	3079
June	1st to 10th	Night	8% 5% 2 7% 5% 4 4 5% 8% 12% 41%	1710
	11th to 20th	Night	4 3 2 5% 4 4 5% 6% 9% 12% 46%	1710
	21st to end	Night	5% 5% 2 6% 5% 5% 6% 7% 7% 14% 39%	1710
July	1st to 10th	Night	3 4 2 7% 5% 6% 7% 7% 10% 18% 32%	2840
	11th to 20th	Night	2 3 1 5% 4 5% 5% 5% 10% 14% 47%	2985
	21st to end	Night	2 3 1 5% 5% 6% 9% 7% 11% 17% 33%	3435
August	1st to 10th	Night	2 3 1 5% 4 4 4 5% 9% 15% 47%	3144
	11th to 20th	Night	3 3 1 5% 4 5% 6% 5% 7% 12% 50%	3100
	21st to end	Night	5% 4 2 8% 5% 6% 7% 6% 9% 12% 37%	3476
September	1st to 10th	Night	9% 5% 2 7% 4 5% 5% 6% 8% 12% 37%	1928
	11th to 20th	Night	10% 6% 2 6% 5% 5% 5% 4 6% 8% 42%	2090
	21st to end	Night	7% 5% 2 6% 4 4 4 3 6% 8% 51%	2090
October	1st to 10th	Night	7% 5% 2 5% 4 3 4 4 5% 8% 53%	2090
	11th to 20th	Night	7% 3 2 3 2 3 3 3 5% 6% 65%	2090
	21st to end	Night	10% 5% 2 5% 3 3 4 2 5% 6% 57%	2482
November	1st to 10th	Night	8% 5% 2 4 2 3 3 3 6% 7% 58%	2470
	11th to 20th	Night	11% 4 2 5% 3 3 4 3 4 6% 54%	2470
	21st to end	Night	11% 6% 2 5% 4 3 4 3 5% 7% 49%	2470
December	1st to 10th	Night	12% 7% 2 6% 4 3 4 3 5% 7% 47%	2470
	11th to 20th	Night	14% 7% 3 6% 4 3 4 3 6% 6% 44%	3042
	21st to end	Night	15% 9% 3 7% 5% 4 4 2 4 5% 41%	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% 4 6% 17% 22% 12%	2942
	11th to 20th	Day	29% 5% 7% 17% 30% 12%	3160
	21st to end	Day	49% 4 4 13% 20% 10%	3476
February	1st to 10th	Day	45% 4 7% 15% 19% 10%	1900
	11th to 20th	Day	39% 5% 7% 17% 19% 12%	1858
	21st to end	Day	42% 8% 9% 14% 16% 10%	1570
March	1st to 10th	Day	49% 5% 9% 17% 13% 6%	3120
	11th to 20th	Day	37% 7% 11% 20% 19% 7%	3310
	21st to end	Day	40% 5% 11% 17% 17% 10%	4055
April	1st to 10th	Day	36% 5% 12% 17% 20% 10%	2280
	11th to 20th	Day	36% 6% 10% 18% 20% 10%	2254
	21st to end	Day	28% 6% 11% 24% 22% 10%	2280
May	1st to 10th	Day	27% 10% 16% 26% 16% 5%	3817
	11th to 20th	Day	39% 7% 13% 23% 16% 2	4085
	21st to end	Day	26% 10% 16% 32% 15% 2	4489
June	1st to 10th	Day	41% 10% 17% 23% 8% 1	2470
	11th to 20th	Day	32% 13% 20% 22% 11% 2	2470
	21st to end	Day	38% 14% 20% 17% 9% 2	2470
July	1st to 10th	Day	41% 17% 28% 11% 2	4055
	11th to 20th	Day	39% 18% 33% 9% 1 1	3901
	21st to end	Day	44% 19% 22% 13% 2	3987
August	1st to 10th	Day	27% 13% 21% 23% 14% 2	3773
	11th to 20th	Day	30% 12% 20% 21% 16% 1	3765
	21st to end	Day	37% 14% 23% 14% 10% 2	4179
September	1st to 10th	Day	40% 13% 19% 13% 10% 5%	2233
	11th to 20th	Day	42% 10% 14% 15% 13% 7%	2090
	21st to end	Day	33% 7% 11% 19% 21% 9%	2090
October	1st to 10th	Day	31% 4 8% 12% 16% 29%	3480
	11th to 20th	Day	16% 3 6% 18% 22% 35%	3458
	21st to end	Day	21% 4 5% 13% 38% 20%	3449
November	1st to 10th	Day	26% 5% 10% 20% 22% 17%	1708
	11th to 20th	Day	29% 5% 8% 17% 28% 14%	1710
	21st to end	Day	33% 6% 8% 19% 22% 12%	1710
December	1st to 10th	Day	37% 7% 11% 17% 20% 9%	1710
	11th to 20th	Day	44% 4 6% 17% 19% 11%	2150
	21st to end	Day	44% 5% 6% 18% 22% 5%	3124
January	1st to 10th	Night	41% 4 6% 10% 25% 14%	4000
	11th to 20th	Night	36% 4 5% 15% 30% 10%	3800
	21st to end	Night	48% 3 5% 14% 22% 8%	4180
February	1st to 10th	Night	41% 5% 6% 17% 21% 11%	2280
	11th to 20th	Night	42% 4 7% 13% 20% 14%	2219
	21st to end	Night	44% 5% 9% 16% 14% 13%	1884
March	1st to 10th	Night	54% 5% 8% 14% 13% 6%	3733
	11th to 20th	Night	36% 7% 11% 17% 19% 9%	3647
	21st to end	Night	38% 4 11% 19% 17% 10%	3604
April	1st to 10th	Night	38% 6% 11% 13% 19% 12%	1900
	11th to 20th	Night	35% 5% 10% 19% 21% 10%	1875
	21st to end	Night	23% 5% 11% 28% 25% 8%	1900
May	1st to 10th	Night	33% 10% 17% 19% 17% 5%	3142
	11th to 20th	Night	37% 7% 13% 23% 17% 2	2813
	21st to end	Night	24% 8% 17% 32% 16% 2	3087
June	1st to 10th	Night	32% 11% 21% 24% 11% 2	1710
	11th to 20th	Night	26% 15% 21% 24% 12% 2	1710
	21st to end	Night	31% 13% 26% 18% 9% 1	1710
July	1st to 10th	Night	33% 17% 35% 12% 3	2795
	11th to 20th	Night	23% 17% 47% 10% 2	2931
	21st to end	Night	31% 25% 28% 13% 2	3325
August	1st to 10th	Night	23% 13% 27% 24% 12% 1	3132
	11th to 20th	Night	24% 12% 24% 26% 13%	3130
	21st to end	Night	35% 14% 22% 18% 9% 2	3476
September	1st to 10th	Night	35% 12% 23% 15% 12% 3	1928
	11th to 20th	Night	38% 10% 15% 17% 14% 5%	2090
	21st to end	Night	29% 9% 13% 22% 20% 9%	2090
October	1st to 10th	Night	34% 6% 7% 12% 19% 22%	3480
	11th to 20th	Night	13% 3 5% 19% 28% 32%	3461
	21st to end	Night	20% 4 4 12% 43% 17%	4093
November	1st to 10th	Night	27% 4 9% 18% 25% 18%	2470
	11th to 20th	Night	32% 4 5% 18% 28% 14%	2470
	21st to end	Night	35% 4 9% 18% 21% 13%	2470
December	1st to 10th	Night	37% 6% 10% 20% 21% 7%	2470
	11th to 20th	Night	40% 5% 8% 12% 24% 12%	3044
	21st to end	Night	46% 5% 6% 18% 21% 4	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	16% 17% 39% 19% 8% 1	270
	11th to 20th	Day	13% 17% 31% 27% 10% 1	270
	21st to end	Day	24% 17% 40% 13% 5%	297
February	1st to 10th	Day	21% 19% 34% 20% 5% 1	270
	11th to 20th	Day	21% 16% 39% 19% 6%	270
	21st to end	Day	10% 25% 45% 15% 4	225
March	1st to 10th	Day	14% 20% 37% 25% 5%	270
	11th to 20th	Day	17% 15% 34% 24% 9% 1	355
	21st to end	Day	17% 13% 33% 25% 12% 1	506
April	1st to 10th	Day	16% 14% 33% 23% 11% 3	460
	11th to 20th	Day	14% 13% 30% 25% 16% 2	452
	21st to end	Day	8% 9% 27% 32% 18% 5%	460
May	1st to 10th	Day	9% 7% 25% 32% 21% 6%	463
	11th to 20th	Day	7% 3 22% 34% 19% 15%	487
	21st to end	Day	8% 3 14% 34% 26% 16%	529
June	1st to 10th	Day	10% 3 13% 32% 27% 16%	490
	11th to 20th	Day	8% 2 12% 30% 27% 21%	490
	21st to end	Day	8% 1 9% 24% 31% 27%	490
July	1st to 10th	Day	7% 3 6% 18% 34% 32%	485
	11th to 20th	Day	5% 2 5% 14% 37% 37%	484
	21st to end	Day	5% 2 6% 21% 39% 28%	532
August	1st to 10th	Day	5% 5% 20% 34% 37%	486
	11th to 20th	Day	8% 1 4 17% 35% 35%	479
	21st to end	Day	10% 1 7% 22% 35% 24%	539
September	1st to 10th	Day	12% 1 8% 21% 35% 23%	490
	11th to 20th	Day	13% 3 8% 29% 33% 13%	490
	21st to end	Day	8% 2 12% 29% 34% 15%	490
October	1st to 10th	Day	9% 5% 21% 37% 23% 6%	490
	11th to 20th	Day	6% 5% 18% 33% 28% 9%	490
	21st to end	Day	12% 8% 21% 35% 20% 4	393
November	1st to 10th	Day	11% 6% 21% 41% 18% 4	282
	11th to 20th	Day	13% 10% 31% 31% 13% 2	270
	21st to end	Day	12% 13% 31% 28% 14% 1	270
December	1st to 10th	Day	15% 14% 31% 26% 11% 3	270
	11th to 20th	Day	22% 15% 31% 24% 7%	270
	21st to end	Day	25% 10% 31% 21% 12% 1	297
January	1st to 10th	Night	19% 12% 32% 30% 6%	760
	11th to 20th	Night	14% 14% 28% 33% 11%	760
	21st to end	Night	23% 11% 33% 28% 5%	836
February	1st to 10th	Night	18% 10% 33% 32% 7%	760
	11th to 20th	Night	20% 12% 32% 27% 9%	743
	21st to end	Night	19% 12% 33% 32% 4	628
March	1st to 10th	Night	14% 11% 32% 33% 10%	760
	11th to 20th	Night	14% 8% 31% 34% 13% 1	760
	21st to end	Night	12% 9% 29% 35% 14% 1	713
April	1st to 10th	Night	16% 7% 26% 36% 14% 1	570
	11th to 20th	Night	13% 6% 26% 32% 21% 1	563
	21st to end	Night	6% 6% 21% 38% 27% 2	570
May	1st to 10th	Night	10% 5% 17% 38% 26% 4	570
	11th to 20th	Night	7% 1 14% 40% 32% 5%	561
	21st to end	Night	6% 1 10% 29% 45% 8%	617
June	1st to 10th	Night	9% 2 8% 29% 43% 10%	570
	11th to 20th	Night	4 2 6% 26% 48% 14%	570
	21st to end	Night	6% 2 6% 20% 49% 18%	570
July	1st to 10th	Night	5% 1 3 17% 50% 24%	555
	11th to 20th	Night	5% 1 2 12% 46% 34%	552
	21st to end	Night	3 3 17% 53% 23%	624
August	1st to 10th	Night	3 1 3 14% 49% 31%	567
	11th to 20th	Night	6% 2 12% 52% 27%	564
	21st to end	Night	8% 2 7% 19% 43% 20%	627
September	1st to 10th	Night	9% 1 6% 22% 44% 18%	598
	11th to 20th	Night	12% 2 11% 27% 39% 10%	760
	21st to end	Night	8% 2 11% 32% 38% 9%	760
October	1st to 10th	Night	9% 2 21% 37% 27% 5%	760
	11th to 20th	Night	8% 5% 18% 35% 30% 5%	760
	21st to end	Night	12% 5% 20% 37% 24% 2	836
November	1st to 10th	Night	10% 4 22% 42% 20% 2	760
	11th to 20th	Night	12% 8% 26% 37% 16% 1	760
	21st to end	Night	13% 6% 29% 36% 14% 2	760
December	1st to 10th	Night	15% 8% 29% 32% 14% 2	760
	11th to 20th	Night	18% 8% 28% 31% 14% 1	760
	21st to end	Night	22% 11% 28% 30% 9%	836

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